US20020140309A1 - Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor - Google Patents

Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor Download PDF

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Publication number
US20020140309A1
US20020140309A1 US10/108,047 US10804702A US2002140309A1 US 20020140309 A1 US20020140309 A1 US 20020140309A1 US 10804702 A US10804702 A US 10804702A US 2002140309 A1 US2002140309 A1 US 2002140309A1
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US
United States
Prior art keywords
rotor
stator
induction motor
rotor yoke
synchronous induction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/108,047
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English (en)
Inventor
Toshihito Yanashima
Keijiro Igarashi
Masaaki Takezawa
Kazuhiko Arai
Eiichi Murata
Noboru Onodera
Shigemi Koiso
Kazuhiro Enomoto
Yoshitomo Nakayama
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Panasonic Intellectual Property Management Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001099883A external-priority patent/JP2002300744A/ja
Priority claimed from JP2001100263A external-priority patent/JP2002300763A/ja
Priority claimed from JP2001100129A external-priority patent/JP2002300762A/ja
Priority claimed from JP2001100198A external-priority patent/JP2002295367A/ja
Priority claimed from JP2001161521A external-priority patent/JP3754324B2/ja
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Assigned to SANYO ELECTRIC CO., LTD. reassignment SANYO ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ENOMOTO, KAZUHIRO, NAKAYAMA, YOSHITOMO, ARAI, KAZUHIKO, IGARASHI, KEIJIRO, KOISO, SHIGEMI, MURATA, EIICHI, ONODERA, NOBORU, TAKEZAWA, MASAAKI, YANASHIMA, TOSHIHITO
Publication of US20020140309A1 publication Critical patent/US20020140309A1/en
Priority to US10/692,865 priority Critical patent/US20040084984A1/en
Priority to US10/901,153 priority patent/US7102264B2/en
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. reassignment PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANYO ELECTRIC CO., LTD.
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/04—Balancing means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor
    • H02P1/445—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor by using additional capacitors switched at start up
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0205—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/07—Electric current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature

Definitions

  • the present invention relates to a synchronous induction motor constituted by a plurality of secondary conductors provided on the peripheral portion of a rotor yoke, an end ring which is positioned on the peripheral portions of both end surfaces of the rotor yoke and which is integrally formed with the secondary conductors by die casting, and a permanent magnet embedded in the rotor yoke.
  • an air conditioner or a refrigerator for example, incorporates a hermetic electric compressor for the refrigerating cycle of a cooling unit of the air conditioner or the refrigerator.
  • a hermetic electric compressor for the refrigerating cycle of a cooling unit of the air conditioner or the refrigerator.
  • an electric constituent for driving the compressor an induction motor, a DC brushless motor, or a synchronous induction motor driven by a single-phase or three-phase commercial power supply has been used.
  • the rotor of the synchronous induction motor is constituted by a stator having stator windings and a rotor rotating in the stator.
  • a plurality of secondary conductors positioned around a rotor yoke that makes up the rotor are die-cast.
  • end rings are integrally formed with the secondary conductors by die-casting onto the peripheral portions of both end surfaces of the rotor yoke. Slots are formed through the rotor yoke, permanent magnets are inserted in the slots, and the openings at both ends of the slots are respectively secured by end surface members.
  • the permanent magnets to be provided in the rotor are inserted in the slots formed in the rotor yoke, then secured by fixing members. Furthermore, in order to ensure good rotational balance of the rotor, balancers are installed in the vicinity of the end rings positioned on the peripheral portions of the end surfaces of the rotor yoke. In this case, after forming the end rings by die casting, the end surface members for fixing the permanent magnets in the slots and the balancers are separately installed. This has been posing a problem in that the assembling efficiency of the synchronous induction motor is considerably deteriorated.
  • the present invention has been made with a view toward solving the problems with the prior art described above, and it is an object of the present invention to provide a synchronous induction motor that features improved assemblability of a rotor of a synchronous induction motor and improved running performance.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein one of the end surface members is secured to the rotor yoke by one of the end rings when the secondary conductors and end rings are formed, and the other end surface member is secured to the rotor yoke by a fixture. Therefore, one of the end surface members can be secured to the rotor yoke
  • the permanent magnets can be secured to the rotor merely by securing the other end surface member to the rotor yoke by a fixture. It is therefore possible to reduce the number of steps for installing the permanent magnets with resultant improved assemblability, permitting the overall productivity of synchronous induction motors to be dramatically improved.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein a non-magnetic member is disposed in contact with the inner sides of the two end rings to secure the two end surface members by pressing them against the rotor yoke by the non-magnetic member. It is therefore possible to increase the sectional areas of the end rings by the amount provided by pressing the end surface members against the non
  • the loss of the rotor can be decreased by the amount equivalent to the increased portion of the sectional areas of the end rings. This allows the amount of generated heat of the rotor to be reduced, making it possible to significantly improve the running performance of the synchronous induction motor.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein a balancer formed into a predetermined shape beforehand is secured by a fixture to the rotor yoke together with the end surface member. Therefore, the ease of installation of the balancer can be considerably improved.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein a plurality of laminated sheet balancers is secured by a fixture to the rotor yoke together with the end surface member. Therefore, the ease of installation of the balancer is improved, permitting dramatically improved productivity to be achieved.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein at least one of the end surface members and a balancer are formed into one piece.
  • the number of components can be reduced. This permits simpler installation of the end surface members, resulting in dramatically improved productivity.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, and a balancer secured by being press-fitted to the inner side of at least one of the end rings.
  • the installation of the balancer can be simplified. This arrangement makes it possible to significantly improve the productivity of the synchronous induction motor.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots in which the permanent magnets have been inserted, wherein the two end surface members are secured to the rotor yoke by the two end rings when the secondary conductors and the end rings are formed.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet does not pass through the rotating shaft.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet bypasses the rotating shaft.
  • a magnetic field produced by the permanent magnet bypasses the rotating shaft.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet passes through only the rotor yoke, excluding the rotating shaft.
  • This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor caused by the friction.
  • a void is formed in the rotor yoke between the permanent magnet and the rotating shaft, so that the passage of the magnetic field produced by the permanent magnet can be reduced.
  • This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor caused by the friction.
  • a pair of the permanent magnets is disposed with the rotating shaft therebetween, and permanent magnets for attracting the magnetic field produced by the paired permanent magnets are disposed at both ends of a line that passes the paired permanent magnets and the rotating shaft. It is therefore possible to prevent the magnetic field produced by the paired permanent magnets from passing through the rotating shaft. Thus, it is possible to prevent the rotating shaft from being magnetized. This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor caused by the friction.
  • the permanent magnets are provided at both ends of a line that connects two magnetic poles, and the permanent magnets are radially disposed substantially about the rotating shaft.
  • the magnetic field produced by the permanent magnets can be spaced away from the rotating shaft.
  • This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of wear on the rotor caused by the friction.
  • a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein the permanent magnet is magnetized by current passed through the stator winding.
  • a rotor in which a magnetic material for the permanent magnet that has not yet been magnetized has been inserted is installed in the stator, so that the rotor can be inserted into the stator without being magnetically attracted to its surrounding.
  • the permanent magnet is made of a rare earth type magnet or a ferrite magnet, so that high magnet characteristic can be achieved.
  • the magnitude of the current passed through the stator winding can be reduced so as to control the temperature at the time of magnetization to a minimum.
  • the deformation of the rotor or the stator or the like that would be caused by high temperature can be minimized, making it possible to provide a synchronous induction motor with secured high quality.
  • the demagnetization at high temperature can be restrained by using, for example, a ferrite magnet or a rare earth type magnet (the coercive force at normal temperature being 1350 to 2150 kA/m and the coercive force temperature coefficient being ⁇ 0.7%/° C. or less).
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding, and the permanent magnet is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the permanent magnet is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a three-phase configuration that includes a three-phase winding.
  • the permanent magnet is magnetized by current passed through a single phase, two phases, or three phases of the stator windings. Therefore, it is possible to select the phase or phases through which current is to be passed according to the disposition of the magnet or the permissible current (against deformation or the like) of the windings.
  • the stator windings are coated with varnish or a sticking agent that is heated to fuse the windings.
  • varnish or a sticking agent that is heated to fuse the windings.
  • the synchronous induction motor in accordance with the present invention is installed in a compressor, allowing the production cost of the compressor to be considerably reduced.
  • the compressor incorporating the synchronous induction motor in accordance with the present invention is used with an air conditioner or an electric refrigerator or the like. Hence, the production cost of the air conditioner or the electric refrigerator can be significantly decreased.
  • a manufacturing method for a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnet constituent for the permanent magnet is embedded in the rotor yoke and current is passed through the stator winding to magnetize the magnet constituent.
  • a rare earth type or ferrite material is used for the magnet constituent. Therefore, a high magnet characteristic can be achieved even if, for example, a magnetizing magnetic field is weak. This makes it possible to reduce the current passing through the stator winding so as to minimize a temperature rise that occurs at the time of magnetization. Thus, the deformation of the rotor or the stator or the like caused by high temperature can be minimized, ensuring high quality of the synchronous induction motor.
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding, and the magnet constituent is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding
  • the magnet constituent is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a three-phase configuration that includes a three-phase winding.
  • the magnet constituent is magnetized by current passed through a single phase, two phases, or three phases of the stator windings. Therefore, it is possible to select the phase or phases through which current is to be passed according to the disposition of the magnet or the permissible current (against deformation or the like) of the windings.
  • the stator windings are coated with varnish or a sticking agent that is heated to fuse the windings.
  • varnish or a sticking agent that is heated to fuse the windings.
  • a drive unit for a synchronous induction motor that includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a series circuit of a start-up capacitor and a PTC, which is connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding, and the series circuit of the start-up capacitor and the PTC, which is connected in parallel to the operating capacitor. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • a drive unit for a synchronous induction motor that includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a PTC connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding and the PTC connected in parallel to the operating capacitor. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • a drive unit for a synchronous induction motor that includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a series circuit of a start-up capacitor and a start-up relay contact connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding, and the series circuit of the start-up capacitor and the start-up relay contact connected in parallel to the operating capacitor. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • a drive unit for a synchronous induction motor that includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, and an operating capacitor connected to the auxiliary winding.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • a hermetic electric compressor having a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and a thermal protector for cutting off the supply of current to the electric unit in response to a predetermined temperature rise is provided in the hermetic vessel.
  • installing the thermal protector onto the stator winding makes it possible to cut off the supply of current to the electric unit if the temperature of the stator winding rises.
  • This arrangement makes it possible to prevent the permanent magnet embedded in the rotor yoke from being thermally demagnetized by a rise in temperature of the electric unit.
  • the supply of current to the stator winding can be cut off before the stator winding generates abnormal heat while the hermetic electric compressor is in operation.
  • This makes it possible to securely prevent damage to the stator winding and thermal demagnetization of the permanent magnet so as to ideally maintain the driving force of a synchronous induction motor, permitting significantly improved reliability of the electric unit.
  • a hermetic electric compressor having a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and a thermal protector for cutting off the supply of current to the electric unit at a predetermined temperature rise is provided on the outer surface of the hermetic vessel.
  • the thermal protector is constructed of a thermistor whose resistance value varies with temperature and a controller that controls the supply of current to the electric unit according to a change in the resistance value of the thermistor.
  • the controller controls the supply of current to the electric unit and cuts off the supply of current to the electric unit.
  • the thermal protector is constituted by a bimetal switch, so that the current supplied to the electric unit can be cut off also if the temperature of the hermetic electric compressor rises. This obviates the need for controllably adjust the electric unit by using an expensive circuit device, making it possible to effect inexpensive and secure protection of the hermetic electric compressor from damage caused by a temperature rise.
  • the thermal protector is constituted by a thermostat that opens/closes a contact according to temperature, so that the current supplied to the electric unit can be cut off also if the temperature of the hermetic electric compressor rises. This obviates the need for controllably adjusting the electric unit by using an expensive circuit device, making it possible to effect inexpensive and secure protection of the hermetic electric compressor from damage caused by a temperature rise.
  • a hermetic electric compressor having a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and an overload protector for cutting off the supply of current to the electric unit in response to a predetermined overload current is provided.
  • the overload protector is constituted by an overload switch, so that the current supplied to the electric unit can be cut off to prevent a temperature rise in the electric unit thereby to protect it if the hermetic electric compressor is overloaded during operation.
  • damage to the electric unit can be prevented, enabling the service life of the electric unit to be considerably prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the overload protector is constituted by a current transformer for detecting the current supplied to the electric unit and a controller for controlling the supply of current to the electric unit on the basis of an output of the current transformer, so that the current supplied to the electric unit can be cut off by the controller if the hermetic electric compressor is overloaded during operation.
  • This arrangement makes it possible to prevent a temperature rise in the electric unit so as to protect the electric unit. Hence, damage to the electric unit attributable to an overload current can be securely prevented.
  • the controller cuts off the supply of current to the electric unit after a predetermined time elapses since a temperature or current exceeded a predetermined value. It is therefore possible to protect, by the controller, the electric unit which would be damaged if continuously subjected to an excessive temperature rise or overcurrent caused by an overloaded operation or the like of the hermetic electric compressor. Thus, damage to the electric unit can be prevented, enabling the service life of the electric unit to be considerably prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the controller restarts the supply of current to the electric unit after waiting for the elapse of a predetermined delay time since the supply of current to the electric unit was cut off.
  • the delay time is always allowed before the supply of current to the electric unit is restarted after the supply of current to the electric unit was cut off. It is therefore possible to prevent the rotor from becoming hot due to, for example, frequent repetition of energizing and de-energizing of the electric unit. Hence, demagnetization of the permanent magnet embedded in the rotor due to heat can be prevented.
  • FIG. 1 is a longitudinal sectional side view of a hermetic electric compressor to which a synchronous induction motor in accordance with the present invention has been applied;
  • FIG. 2 is a plan view of the hermetic electric compressor with its hermetic vessel split into two;
  • FIG. 3 is a cross sectional top view of the motor
  • FIG. 4 is a partially cutaway cross sectional top view of a rotor
  • FIG. 5 is a side view of the rotor
  • FIG. 6 is a top view of the rotor
  • FIG. 7 is a longitudinal side view of the rotor shown in FIG. 6;
  • FIG. 8 is a refrigerant circuit diagram of an air conditioner or an electric refrigerator or the like that uses the hermetic electric compressor provided with the synchronous induction motor in accordance with the present invention
  • FIG. 9 is an electric circuit diagram of the synchronous induction motor
  • FIG. 10 is a top view of another rotor
  • FIG. 11 is a partially longitudinal sectional side view of the rotor shown in FIG. 10;
  • FIG. 12 is a top view of another rotor
  • FIG. 13 is a longitudinal sectional side view of the rotor shown in FIG. 12;
  • FIG. 14 is a top view of a rotor illustrating an end surface member that is provided inside an end ring and fixed by a balancer;
  • FIG. 15 is a diagram showing a part of the longitudinal sectional side view of the rotor shown in FIG. 12;
  • FIG. 16 is a diagram showing a part of the longitudinal sectional side view of a rotor incorporating a balancer formed of a plurality of laminated sheet balancers;
  • FIG. 17 is a top view of a rotor in which an end surface member and a balancer have been integrally formed and installed;
  • FIG. 18 is a diagram showing a part of the longitudinal sectional side view of the rotor shown in FIG. 17;
  • FIG. 19 is a top view of another rotor
  • FIG. 20 is a partial longitudinal sectional side view of the rotor shown in FIG. 19;
  • FIG. 21 is a top view of a rotor in which an end surface member is integrally formed with a balancer and fixed to a rotor yoke;
  • FIG. 22 is a partial longitudinal sectional side view of the rotor shown in FIG. 21;
  • FIG. 23 is a cross sectional top view of another rotor
  • FIG. 24 is an analytical diagram of a magnetic field of a rotor in the layout of the permanent magnet shown in FIG. 4;
  • FIG. 25 illustrates a magnetic flux density in a rotating shaft of the rotor shown in FIG. 24;
  • FIG. 26 is an analytical diagram of a magnetic field of a rotor observed when a void is formed in the rotor yoke in the layout of the permanent magnet shown in FIG. 4;
  • FIG. 27 is a diagram illustrating a magnetic flux density in the rotating shaft of the rotor shown in FIG. 26;
  • FIG. 28 is an analytical diagram of the magnetic field of the rotor observed when a plurality of voids is formed in the rotor yoke in the layout of the permanent magnet shown in FIG. 4;
  • FIG. 29 is a diagram illustrating a magnetic flux density in the rotating shaft of the rotor shown in FIG. 28;
  • FIG. 30 is an analytical diagram of the magnetic field of a rotor configured such that a magnetic field produced by a permanent magnet bypasses a rotating shaft;
  • FIG. 31 is a diagram illustrating a magnetic flux density in the rotating shaft of the rotor shown in FIG. 28;
  • FIG. 32 is a cross sectional top view of a rotor illustrating another layout example of a permanent magnet
  • FIG. 33 is a cross sectional top view of a rotor illustrating yet another layout example of a permanent magnet
  • FIG. 34 is a cross sectional top view of a rotor illustrating still another layout example of a permanent magnet
  • FIG. 35 is a cross sectional top view of a rotor illustrating a further layout example of a permanent magnet
  • FIG. 36 is a cross sectional top view of a rotor illustrating another layout example of a permanent magnet
  • FIG. 37 is a cross sectional top view of a rotor illustrating another layout example of a permanent magnet
  • FIG. 38 is a partially cutaway cross sectional top view of another rotor
  • FIG. 39 is a partial longitudinal sectional side view of the rotor shown in FIG. 38;
  • FIG. 40 is a cross sectional top view of the rotor shown in FIG. 38;
  • FIG. 41 is a cross sectional top view of another rotor
  • FIG. 42 is a cross sectional top view of yet another rotor
  • FIG. 43 is a cross sectional top view of still another rotor
  • FIG. 44 is a cross sectional top view of a further rotor
  • FIG. 45 is a cross sectional top view of another rotor
  • FIG. 46 is an electrical circuit diagram of a three-phase, two-pole synchronous induction motor
  • FIG. 47 is an electrical circuit diagram of a drive unit of the synchronous induction motor in accordance with the present invention.
  • FIG. 48 is an electrical circuit diagram of a drive unit of another synchronous induction motor
  • FIG. 49 is an electrical circuit diagram of a drive unit of still another synchronous induction motor
  • FIG. 50 is an electrical circuit diagram of a drive unit of yet another synchronous induction motor
  • FIG. 51 is a diagram illustrating a relationship between a rotational torque and a number of revolutions provided by each electric circuit of each drive unit;
  • FIG. 52 is another refrigerant circuit diagram of an air conditioner or an electric refrigerator or the like that uses the hermetic electric compressor incorporating a synchronous induction motor;
  • FIG. 53 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of the hermetic electric compressor in accordance with the present invention.
  • FIG. 54 is an electrical circuit diagram of a synchronous induction motor
  • FIG. 55 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of another hermetic electric compressor
  • FIG. 56 is an electrical circuit diagram of a synchronous induction motor of the hermetic electric compressor shown in FIG. 55;
  • FIG. 57 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of another hermetic electric compressor
  • FIG. 58 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of still another hermetic electric compressor
  • FIG. 59 is an electrical circuit diagram of a synchronous induction motor of the hermetic electric compressor shown in FIG. 58;
  • FIG. 60 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of yet another hermetic electric compressor
  • FIG. 61 is an electrical circuit diagram of a synchronous induction motor of the hermetic electric compressor shown in FIG. 60;
  • FIG. 62 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of a further hermetic electric compressor
  • FIG. 63 is an electrical circuit diagram of a synchronous induction motor of the hermetic electric compressor shown in FIG. 62;
  • FIG. 64 is a longitudinal sectional side view of a part (in the vicinity of an end cap) of another hermetic electric compressor
  • FIG. 65 is an electrical circuit diagram of a synchronous induction motor of the hermetic electric compressor shown in FIG. 64.
  • FIG. 66 is an electrical circuit diagram of a synchronous induction motor of another hermetic electric compressor.
  • FIG. 1 is a longitudinal sectional side diagram of a hermetic electric compressor C, an embodiment to which the present invention is applied.
  • a hermetic vessel 1 in FIG. 1 includes a synchronous induction motor 2 in accordance with the present invention in an upper compartment and a compressor 3 in a lower compartment in the hermetic vessel 1 , the compressor 3 being rotatively driven by the synchronous induction motor 2 .
  • the hermetic vessel 1 is split into two parts in advance to house the synchronous induction motor 2 and the compressor 3 , then hermetically sealed by high-frequency welding or the like.
  • the hermetic electric compressor C may be a rotary, reciprocal, scroll compressor, or the like.
  • the synchronous induction motor 2 is constructed of a single-phase, two-pole stator 4 secured to the inner wall of the hermetic vessel 1 and a rotor 5 which is located on the inner side of the stator 4 and rotatively supported around a rotating shaft 6 .
  • the stator 4 is provided with a stator winding 7 for applying a rotational magnetic field to the rotor 5 .
  • the compressor 3 has a first rotary cylinder 9 and a second rotary cylinder 10 separated by a partitioner 8 .
  • the cylinders 9 and 10 have eccentric members 11 and 12 rotatively driven by the rotating shaft 6 .
  • the eccentric positions of the eccentric members 11 and 12 are phase-shifted from each other 180 degrees.
  • a first roller 13 located in the cylinder 9 and a second roller 14 located in the cylinder 10 rotate in the cylinders as the eccentric members 11 and 12 rotate.
  • Reference numerals 15 and 16 denote a first frame member and a second frame member, respectively.
  • the first frame member 15 forms a closed compression space of the cylinder 9 between itself and the partitioner 8 .
  • the second frame member 16 forms a closed compression space of the cylinder 10 between itself and the partitioner 8 .
  • the first frame member 15 and the second frame member 16 are equipped with bearings 17 and 18 , respectively, that rotatively support the bottom of the rotating shaft 6 .
  • Discharge mufflers 19 and 20 are installed so as to cover the first frame member 15 and the second frame member 16 .
  • the cylinder 9 and the discharge muffler 19 are in communication through a discharge aperture (not shown) provided in the first frame member 15 .
  • the cylinder 10 and the discharge muffler 20 are also in communication through a discharge aperture (not shown) provided in the second frame member 16 .
  • a bypass pipe 21 provided outside the hermetic vessel 1 , and is in communication with the interior of the discharge muffler 20 .
  • a discharge pipe 22 is provided at the top of the hermetic vessel 1 .
  • Suction pipes 23 and 24 are connected to the cylinders 9 and 10 , respectively.
  • a hermetic terminal 25 supplies electric power to the stator winding 7 of the stator 4 from outside the hermetic vessel 1 (the lead wire connecting the hermetic terminal 25 and the stator winding 7 being not shown).
  • a rotor iron core 26 is formed of a plurality of laminated rotator iron plates, each of which is made by punching an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm (not shown) into a predetermined shape.
  • the laminated rotator iron plates are crimped into one piece, or may be welded into one piece.
  • End surface members 66 and 67 are attached to the top and bottom ends of the rotor iron core 26 .
  • the end surface members 66 and 67 are formed of planes made of a non-magnetic material, such as stainless steel, aluminum, copper, or brass.
  • end surface members 66 and 67 should use a magnetic material, then the end surface members 66 and 67 would provide a magnetic path, and the magnet of the rotor 5 would develop a magnetic short circuit, leading to degraded running performance of the synchronous induction motor 2 . For this reason, a non-magnetic material is used for the members 66 and 67 .
  • FIG. 2 is a plan view of the hermetic electric compressor C having the hermetic vessel 1 split into two parts.
  • FIG. 3 is a cross sectional top view of the hermetic electric compressor C
  • FIG. 4 is a cross sectional top view of the rotor 5
  • FIG. 5 is a side view of the rotor 5 .
  • the stator 4 has the stator winding 7 wound around the stator 4 .
  • a leader line 50 connected to the stator winding 7 and a coil end of the stator winding 7 are joined together with a polyester thread 70 , and the leader line 50 is connected to the hermetic terminal 25 .
  • the rotor 5 is constructed of a rotor yoke 5 A, die-cast squirrel-cage secondary conductors 5 B positioned around the rotor yoke 5 A, a die-cast end ring 69 which is positioned on the peripheral portion of an end surface of the rotor yoke 5 A, which annularly protrudes by a predetermined dimension, and which is integrally die-cast with the squirrel-cage secondary conductors 5 B, and permanent magnets 31 embedded in the rotor yoke 5 A.
  • the permanent magnets 31 are magnetized after permanent magnet materials are inserted in slots 44 , which will be discussed hereinafter.
  • the permanent magnets 31 ( 31 SA and 31 SB) embedded in one side (e.g., the right side in the drawing) from the rotating shaft 6 are polarized with the same south pole, while the permanent magnets 31 ( 31 NA and 31 NB) embedded in the other side (e.g., the left side in the drawing) are polarized with the same north pole.
  • the plurality of squirrel-cage secondary conductors 5 B are provided on the peripheral portion of the rotor yoke 5 A and have aluminum diecast members injection-molded in cylindrical holes (not shown) formed in the cage in the direction in which the rotating shaft 6 extends.
  • the squirrel-cage secondary conductors 5 B are formed in a so-called skew pattern in which they are spirally inclined at a predetermined angle in the circumferential direction of the rotating shaft 6 from one end toward the other end, as shown in FIG. 5.
  • the rotor yoke 5 A has a plurality of slots 44 (four in this embodiment) vertically formed with both ends open. The openings at both ends of the slots 44 are closed by a pair of the end surface members 66 and 67 , respectively, as shown in FIGS. 6 and 7.
  • the end surface member 67 is fixed to the rotor yoke 5 A by the end ring 69 .
  • the end surface member 66 is secured to the rotor yoke 5 A by a plurality of rivets 66 A functioning as fixtures.
  • the permanent magnets 31 are made of a rare earth type permanent magnet material of, for example, a praseodymium type permanent magnet or a neodymium type permanent magnet with nickel plating or the like provided on the surface thereof so as to produce high magnetic forces.
  • the permanent magnets 31 and 31 are provided such that they oppose the rotating shaft 6 , and the opposing permanent magnets 31 and 31 are embedded and magnetized to have opposite poles.
  • the permanent magnets 31 SA and 31 SB embedded in one side (e.g., the right side and the upper side in the drawing) from the rotating shaft 6 are polarized with the same south pole, while the permanent magnets 31 NA and 31 NB embedded in the other side (e.g., the left side and the lower side in the drawing) are polarized with the same north pole. More specifically, the permanent magnets 31 SA, 31 SB and the permanent magnets 31 NA, 31 NB are disposed to substantially form a rectangular shape around the rotating shaft 6 , and are embedded such that they carry two poles, namely, the south pole and the north pole, outward in the circumferential direction of the rotating shaft 6 .
  • the layout of the permanent magnets 31 shown in FIGS. 6 and 7 is different from the layout of the permanent magnets 31 shown in FIGS. 2, 3, and 4 .
  • the layout of the permanent magnets 31 shown in FIGS. 6 and 7 may be replaced by the layout shown in FIGS. 2, 3, and 4 . In this case, however, the riveting positions of the rivets 66 A have to be changed. Further alternatively, the permanent magnets 31 shown in FIGS. 2, 3, and 4 may be arranged as shown in FIG. 6 or 7 .
  • the hermetic electric compressor C provided with the synchronous induction motor 2 set forth above is used in a refrigerant circuit (FIG. 8) of an air conditioner or an electric refrigerator or the like to cool the interior of a room or a refrigerator. More specifically, when the compressor 3 of the hermetic electric compressor C is driven, a refrigerant sealed in the refrigerant circuit is drawn in through a suction pipe 23 , compressed by the first rotary cylinder 9 and the second rotary cylinder 10 , and discharged into a pipe 27 from a discharge pipe 22 . The compressed gas refrigerant discharged into the pipe 27 flows into a condenser 28 where it radiates heat and is condensed into a liquid refrigerant, then flows into a receiver tank 29 .
  • a condenser 28 where it radiates heat and is condensed into a liquid refrigerant
  • the liquid refrigerant that flows into and temporarily stays in the receiver tank 29 passes from a pipe 29 A at the outlet side of the receiver tank 29 to a dryer 30 , a moisture indicator 35 , a solenoid valve 36 , and a thermostatic expansion valve 37 wherein it is throttled. Then, the liquid refrigerant flows into an evaporator 38 where it evaporates. At this time, the refrigerant absorbs heat around it to effect its cooling action. When the refrigerant almost liquefies, the refrigerant runs from a pipe 38 A at the outlet side of the evaporator 38 into an accumulator 39 where it undergoes vapor-liquid separation, then it is drawn back into the compressor 3 again through a check valve 40 . This refrigerating cycle is repeated.
  • the liquid refrigerant that has left the receiver tank 29 is branched off from the pipe 29 A into a pipe 38 A between the evaporator 38 and the accumulator 39 via a capillary tube 41 , a high/low pressure switch 42 , and a capillary tube 43 .
  • the high/low pressure switch 42 detects the pressures of the pipe 29 A and the pipe 38 A through the capillary tubes 41 and 43 . If the pressures of the two pipes 29 A and 38 A exceeds a predetermined pressure difference or more, resulting in an insufficient amount of the refrigerant drawn into the hermetic electric compressor C, then the liquid refrigerant from the receiver tank 29 is allowed to flow into the compressor 3 for protection.
  • the thermostatic expansion valve 37 automatically adjusts its opening degree on the basis of the temperature detected by a thermosensitive cylinder 34 provided at the outlet end of the evaporator 38 .
  • FIG. 9 shows an electrical circuit diagram of the synchronous induction motor 2 .
  • the synchronous induction motor 2 shown in FIG. 9 that receives power from a single-phase alternating current commercial power source AC is equipped with a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • the auxiliary winding 7 B connected to one end of the single-phase alternating current commercial power source AC is connected in series to the other end of the power source AC through the intermediary of a PTC 46 and a start-up capacitor 48 and also connected to an operating capacitor 47 in parallel to the PTC 46 and the start-up capacitor 48 .
  • the PTC 46 is formed of a semiconductor device whose resistance value increases in proportion to temperature. The resistance value is low when the synchronous induction motor 2 is started, and increases as current passes therethrough, generating heat.
  • a power switch 49 is constituted by a current-sensitive type line current sensor for detecting line current and an overload relay that serves also as a protective switch used to supply power from the single-phase alternating current commercial power source AC to the stator winding 7 and to cut off the supply of power to the stator winding 7 .
  • the operating capacitor 47 is set to have a capacitance suited for steady operation, and the operating capacitor 47 and the start-up capacitor 48 are set to provide capacitances suited for start-up in the state wherein the capacitors 47 and 48 are connected in parallel.
  • This energization causes the PTC 46 to start self-heating, and the resistance value of the PTC 46 increases accordingly until very little current passes through the PTC 46 itself.
  • the start-up capacitor 48 is isolated, and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B by the operating capacitor 47 .
  • the hermetic electric compressor C operates, air conditioning is effected in a room or the interior of a refrigerator is cooled.
  • one of the end surface members 67 is secured to the rotor yoke 5 A by one of the end rings 69 when the secondary conductors 5 B and the two end rings 68 and 69 are formed.
  • the other end surface member 66 is secured to the rotor yoke 5 A by the rivets 66 A.
  • the permanent magnets 31 can be secured to the rotor 5 merely by securing the other end surface member 66 to the rotor yoke 5 A by the rivets 66 A.
  • FIG. 10 and FIG. 11 Another rotor 5 is shown in FIG. 10 and FIG. 11.
  • non-magnetic constituents 55 and 56 are disposed in contact with the inner sides of the two end rings 68 and 69 , which are integrally die-cast with the squirrel-cage type secondary conductors 5 B making up the rotor 5 .
  • the non-magnetic constituents 55 and 56 are made of copper, brass, or the like that allows easy passage of current.
  • the thickness of the non-magnetic constituents 55 and 56 is set such that, when they are closely attached onto the plate-like end surface members 66 and 67 that close both ends of the permanent magnets 31 embedded in the rotor yoke 5 A, they do not jut out beyond the end rings 68 and 69 that are integrally die-cast, protruding from both end surfaces of the rotor yoke 5 A.
  • the non-magnetic constituents 55 and 56 are riveted at both ends thereof by the rivets 66 B in the engaging through holes 5 C provided in the rotor yoke 5 A.
  • the rivets 66 B are fixed at four positions in the inner side of the corners where both ends of the individual permanent magnets 31 SA, 31 SB and the permanent magnets 31 NA, 31 NB are in contact, the permanent magnets being disposed substantially into a rectangular shape around the rotating shaft 6 .
  • the non-magnetic constituents 55 and 56 fix the two end surface members 66 and 67 by pressing them against the rotor yoke 5 A.
  • FIG. 12 and FIG. 13 show another rotor 5 .
  • the non-magnetic constituents 55 and 56 are disposed in contact with the inner sides of the two end rings 68 and 69 , which are integrally die-cast with the squirrel-cage type secondary conductors 5 B making up the rotor 5 .
  • the non-magnetic constituents 55 and 56 are made of copper, brass, or the like that allows easy passage of current.
  • the thickness of the non-magnetic constituents 55 and 56 is set such that, when they are closely attached onto the plate-like end surface members 66 and 67 that close both ends of the permanent magnets 31 embedded in the rotor yoke 5 A, they do not jut out beyond the end rings 68 and 69 that are integrally die-cast, protruding from both end surfaces of the rotor yoke 5 A.
  • Engaging pins 55 A, 55 A having a predetermined diameter and a predetermined length are protuberantly formed on one surface of the non-magnetic constituent 55 .
  • engaging pins 56 A, 56 A having a predetermined diameter and a predetermined length are protuberantly formed on one surface of the non-magnetic constituent 56 .
  • the non-magnetic constituents 55 and 56 are formed using a cast, and the engaging pins 55 A, 55 A, 56 A, and 56 A are integrally formed with the non-magnetic constituents 55 and 56 .
  • the non-magnetic constituents 55 and 56 are fixed by being press-fitted into the engaging holes 5 C provided in the rotor yoke 5 A.
  • the non-magnetic constituents 55 and 56 secure the two end surface members 66 and 67 by pressing them against the rotor yoke 5 A.
  • the non-magnetic constituents 55 and 56 are disposed in contact with the inner sides of the two end rings 68 and 69 , and the two end surface members 66 and 67 are secured by being pressed against the rotor yoke 5 A by the non-magnetic constituents 55 and 56 . Therefore, the sectional areas of the end rings 68 and 69 can be increased by the amount provided by the non-magnetic constituents 55 and 56 securing the members 66 and 67 by pressing. With this arrangement, the secondary resistance is decreased by the amount equivalent to the increase in the sectional areas of the end rings 68 and 69 . Hence, a rise in temperature of the end rings 69 and 69 can be restrained, and the magnetic forces of the magnets can be effectively used, making it possible to significantly improve the running performance of the synchronous induction motor 2 .
  • the rotor yoke 5 A is provided with a balancer 60 for ensuring good rotational balance of the rotor 5 (see FIG. 14 and FIG. 15).
  • the balancer 60 die-cast into a predetermined shape in advance has an end surface fixing portion 60 A for fixing the end surface member 66 and a rested portion 60 B placed on the end ring 68 , the end surface fixing portion 60 A and the rested portion 60 B forming a step.
  • the balancer 60 is shaped substantially like a semicircle of the rotor yoke 5 A.
  • Rivets 66 C are located substantially equidistantly from the center of the semicircular balancer 60 , and the balancer 60 is secured to the rotor yoke 5 A together with the end surface members 66 by the rivets 66 C.
  • a balancer assembly 61 is shown in FIG. 16.
  • the balancer 61 is constructed of a predetermined number of plate-like balancers 61 A and plate-like balancers 61 B having substantially the same outer configuration as that of the rested portion 60 B.
  • the plate-like balancers 61 A are made of metal plates, each plate being made of stainless steel, copper, brass, or the like and having a predetermined thickness and having substantially the same outer configuration as that of the end surface fixing portion 60 A of the balancer 60 shown in FIG. 14.
  • a predetermined number of the plate-like balancers 61 A and a predetermined number of the plate-like balancers 61 B are laminated, and secured to the rotor yoke 5 A together with the end surface member 66 by the rivets 66 C, thereby making up the balancer assembly 61 .
  • the balancer assembly 60 is fixed to the rotor yoke 5 A together with the end surface member 66 by the rivets 66 A, greater ease of installation of the balancer 60 can be achieved, allowing considerably higher productivity to be achieved. Moreover, since a plurality of the plate-like balancers 61 A and 61 B are laminated, the weight of the balancer assembly 61 can be easily adjusted. In addition, the cost of the balancer assembly 61 can be significantly reduced by using, for example, inexpensive metal plates for the balancer assembly 61 .
  • FIG. 17 and FIG. 18 show another balancer assembly 62 .
  • the balancer assembly 62 is formed of the end surface member 67 and the balancer 60 shown in FIG. 14 combined into one piece.
  • a weight portion 62 A corresponding to the balancer 60 and an end surface portion 62 B which is formed continuously from the weight 62 A and which corresponds to the end surface member 67 are combined into one piece.
  • the balancer assembly 62 is die-cast, or formed by pouring molten copper, brass, or the like into a mold.
  • the end surface portion 62 B and the weight portion 62 A are secured to the rotor yoke 5 A together with the other end surface member 67 by a rivet 66 B and a rivet 66 C, respectively.
  • the balancer 62 is formed of the end surface member 67 and the balancer 60 combined into one piece, the number of components can be reduced. This allows the installation of the end surface member 67 to be simplified, thus permitting dramatically improved productivity to be achieved.
  • FIG. 19 and FIG. 20 show another rotor 5 .
  • the rotor yoke 5 A constituting the rotor 5 has a plurality of slots 44 (four in this embodiment) that are formed to vertically penetrate the rotor yoke 5 A and have their both ends open. The openings of both ends of the slots 44 are closed by a pair of end surface members 66 and 67 , as shown in FIG. 19 and FIG. 20.
  • the end surface member 67 is integrally secured to the rotor yoke 5 A by the end ring 69
  • the end surface member 66 is integrally secured to the rotor yoke 5 A by the end ring 68 .
  • the rotor yoke 5 A, the end rings 68 and 69 , and the end surface members 66 and 67 are die-cast into one piece. This secures the two end surface members 66 and 67 to both ends of the rotor yoke 5 A, and also fixes the permanent magnets 31 in the slots 44 .
  • the permanent magnets 31 are made of a rare earth type permanent magnet material of, for example, a praseodymium type permanent magnet or a neodymium type permanent magnet with nickel plating or the like provided on the surface thereof so as to produce high magnetic forces.
  • the permanent magnets 31 and 31 are provided such that they oppose the rotating shaft 6 , and the opposing permanent magnets 31 and 31 are embedded and magnetized to have opposite poles.
  • the permanent magnets 31 SA and 31 SB embedded in one side (e.g., the right side and the upper side in the drawing) from the rotating shaft 6 are polarized with the same south-seeking poles, while the permanent magnets 31 NA and 31 NB embedded in the other side (e.g., the left side and the lower side in the drawing) are polarized with the same north-seeking poles. More specifically, the permanent magnets 31 SA, 31 SB and the permanent magnets 31 NA, 31 NB are disposed to substantially form a rectangular shape around the rotating shaft 6 , and are embedded such that they carry two poles, namely, the south pole and the north pole, outward in the circumferential direction of the rotating shaft 6 .
  • the layout of the permanent magnets 31 shown in FIGS. 19 and 20 is different from the layout of the permanent magnets 31 shown in FIGS. 2, 3, and 4 .
  • the layout of the permanent magnets 31 shown in FIGS. 19 and 20 may be replaced by the layout shown in FIGS. 2, 3, and 4 . Further alternatively, the permanent magnets 31 shown in FIGS. 2, 3, and 4 may be arranged as shown in FIG. 19 or 20 .
  • the two end surface members 66 and 67 are secured to the rotor yoke 5 A by the two end rings 68 and 69 when the secondary conductors 5 B and the end rings 68 and 69 are formed by die casting, the two end surface members 66 and 67 can be easily secured to the rotor yoke 5 A when the secondary conductors 5 B and the end rings 68 and 69 are formed by die casting.
  • This arrangement makes it possible to obviate the need of, for example, the cumbersome step for inserting the permanent magnets 31 into the slots 44 , then attaching the end surface members 66 and 67 to both ends of the rotor yoke 5 A after die-casting the end rings 68 and 69 , as in the case of a prior art.
  • FIGS. 21 and 22 Another rotor is shown in FIGS. 21 and 22.
  • a rotor yoke 5 A is provided with a balancer 60 for ensuring good rotational balance of the rotor 5 .
  • the balancer 60 is integrally formed with an end surface member 66 , and is constituted by an end surface plate portion 60 A, a weight portion 60 C, and a connecting portion 60 B that connects the weight portion 60 C and the end surface plate portion 60 A.
  • the weight portion 60 C is formed to have a sufficient size to be rested on an end ring 68 , and has a substantially semicircular shape.
  • the end surface plate portion 60 A has substantially the same shape as the end surface member 66 .
  • the end surface plate portion 60 A and the weight portion 60 C are connected by the connecting portion 60 B.
  • the end surface plate portion 60 A, the weight portion 60 C, and the connecting portion 60 B are formed into one piece.
  • the balancer 60 is cast by pouring molten copper, brass, or the like into a mold.
  • the connecting portion 60 B is positioned on the inner side of the end ring 68 , with the periphery of the end surface plate portion 60 A slightly extending into the end ring 68 .
  • the weight portion 60 C is formed on the end ring 68 .
  • the balancer 60 formed as set forth above is secured to the rotor yoke 5 A by the end ring 68 when both end surface members 66 and 67 , secondary conductors 5 B, and the end rings 68 and 69 are die-cast.
  • the end surface member 67 is secured to the rotor yoke 5 A by the end ring 69 , as previously mentioned. This fixes the permanent magnets 31 in slots 44 of the rotor yoke 5 A.
  • the balancer 60 and the end surface member 67 are secured to the rotor yoke 5 A when the secondary conductors 5 B and the two end rings 68 and 69 are die-cast.
  • the permanent magnets 31 are made of a rare earth type permanent magnet material of, for example, a praseodymium type permanent magnet or a neodymium type permanent magnet with nickel plating or the like provided on the surface thereof so as to produce high magnetic forces.
  • the permanent magnets 31 and 31 are provided such that they oppose the rotating shaft 6 , and the opposing permanent magnets 31 and 31 are embedded and magnetized to have opposite poles, as shown in FIG. 23.
  • the permanent magnets 31 SA and 31 SB embedded in one side (e.g., the right side and the upper side in the drawing) from the rotating shaft 6 are polarized with the same south-seeking poles, while the permanent magnets 31 NA and 31 NB embedded in the other side (e.g., the left side and the lower side in the drawing) are polarized with the same north-seeking poles. More specifically, the permanent magnets 31 SA, 31 SB and the permanent magnets 31 NA, 31 NB are disposed to substantially form a rectangular shape around the rotating shaft 6 , and are embedded such that they carry two poles, namely, the south pole and the north pole, outward in the circumferential direction of the rotating shaft 6 .
  • the layout of the permanent magnets 31 shown in FIG. 23 is different from the layout of the permanent magnets 31 shown in FIGS. 2, 3, and 4 .
  • the layout of the permanent magnets 31 shown in FIG. 23 may be replaced by the layout shown in FIGS. 2, 3, and 4 . Further alternatively, the permanent magnets 31 shown in FIGS. 2, 3, and 4 may be arranged as shown in FIG. 23.
  • FIG. 24 is an analytical diagram of the magnetic field of the rotor 5 shown in FIG. 4.
  • a magnetic field in which both permanent magnets 31 and 31 attract each other is formed; however, only the south-pole side of the magnetic field is shown in FIG. 24.
  • the permanent magnets 31 and 31 mounted on the rotor 5 and opposing the rotating shaft 6 are arranged to have opposite magnetic poles from each other against the rotating shaft 6 .
  • the magnetic flux of the rotor 5 with this arrangement is 0.294 ⁇ 10 ⁇ 2 [Wb], although it depends on the magnetic force of the permanent magnets 31 and other conditions.
  • a lubricant runs between the rotor 5 and the rotating shaft 6 , and the rotor yoke 5 A in which the permanent magnets 31 have been inserted is formed of a ferromagnetic member. Therefore, most lines of magnetic force (hereinafter referred to as the “magnetic field”) of both permanent magnets 31 and 31 pass through the rotor yoke 5 A and attract each other. A part of the magnetic field bypasses the rotor yoke 5 A and passes through the rotating shaft 6 via a void (including a lubricant). It is already well known that a magnetic member easily passes a magnetic field, while the void, which is not a magnetic member, restrains the passage of the magnetic field; therefore, no further explanation will be given.
  • the magnetic flux density of the rotating shaft 6 ranges from about 0.3 teslas up to about 0.42 teslas, as shown in FIG. 25, although it depends on the magnetic forces of the permanent magnets 31 and other conditions. More specifically, the magnetic field of the permanent magnets 31 that passes through the rotating shaft 6 magnetizes the rotating shaft 6 .
  • the different permanent magnets 31 and 31 are laterally disposed in FIG. 4, and the different permanent magnets 31 and 31 are vertically disposed in FIG. 24; however, both are the same permanent magnets.
  • the south magnetic pole of the permanent magnets 31 is shown, and the north magnetic pole has been omitted, because a magnetic field symmetrical to that of the south magnetic pole is produced on the north magnetic pole side.
  • FIG. 26 is an analytical diagram of a magnetic field produced when the rotor 5 of FIG. 24 is provided with voids 5 D.
  • the voids 5 D are arcuately formed in the rotor yoke 5 A around the rotating shaft 6 and formed such that they are spaced away from the rotating shaft 6 by a predetermined distance and they penetrate in the direction in which the rotating shaft 6 extends.
  • the voids 5 D are laterally spaced away from each other by a predetermined dimension from a point where the permanent magnet 31 is closest to the rotating shaft 6 , and the voids 5 D are extended therefrom for a predetermined length and arcuately formed around the rotating shaft 6 .
  • the magnetic flux force of the rotor 5 in this case is 0.294 ⁇ 10 ⁇ 2 [Wb].
  • the voids 5 D provided in the rotor yoke 5 A are formed around the rotating shaft 6 , and the magnetic field is accordingly formed around the rotating shaft 6 .
  • a part of the magnetic field of the two permanent magnets 31 and 31 passes between the two voids 5 D and enter the rotating shaft 6 .
  • the magnetic flux density of the rotating shaft 6 ranges from about 0.25 teslas up to about 0.49 teslas, as shown in FIG. 27.
  • the rotating shaft 6 located therebetween is magnetized.
  • FIG. 28 is an analytical diagram of a magnetic field produced when the rotor 5 is provided with a plurality of voids 5 D at positions different from those of the voids 5 D shown in FIG. 26.
  • a void 5 D is arcuately formed in the rotor yoke 5 A around the rotating shaft 6 and formed such that they are spaced away from the rotating shaft 6 by a predetermined distance and it penetrates in the direction in which the rotating shaft 6 extends, as mentioned above.
  • the void 5 D is laterally and arcuately formed for a predetermined dimension from a point where the permanent magnet 31 is closest to the rotating shaft 6 .
  • arcuate voids 5 D are further formed around the rotating shaft 6 , with predetermined dimensions allowed from both ends of the void 5 D.
  • the void 5 D having a predetermined width is provided at the central portion where the permanent magnets 31 and 31 provided in the rotor 5 attract each other so as to reduce the magnetic field passing through the rotor 5 , thereby altering the direction of the magnetic field in the rotor 5 .
  • the magnetic flux of the rotor 5 in this case is 0.288 ⁇ 10 ⁇ 2 [Wb].
  • the voids 5 D provided in the rotor yoke 5 A are formed around the rotating shaft 6 ; however, the one of the voids 5 D laterally extends by a predetermined dimension from the point where the permanent magnet 31 is closest to the rotating shaft 6 , and the magnetic field reduces when it passes through the void 5 D.
  • the magnetic field bypasses the voids 5 D, as illustrated.
  • the magnetic field formed by the permanent magnets 31 and 31 bypasses the rotating shaft 6 because of the voids 5 D.
  • the magnetic flux density of the rotating shaft 6 ranges from about 0.23 teslas up to about 0.32 teslas, as shown in FIG. 29. In other words, since the magnetic field of the permanent magnets 31 avoids passing through the voids 5 D, the rotating shaft 6 is hardly magnetized.
  • FIG. 30 is an analytical diagram showing a magnetic field of the rotor 5 when the permanent magnets 31 are disposed at different positions.
  • permanent magnets 31 SB are provided between two permanent magnets 31 SA (one of the permanent magnets 31 SA is not shown) that oppose the rotating shaft 6 .
  • the permanent magnets 31 SB and 31 SB are disposed such that they are inclined with respect to the center of the permanent magnet 31 SA provided on the outer side of the rotor 5 .
  • the permanent magnets 31 SB are inclined in the direction such that the flow of the magnetic field of the permanent magnet 31 SA moves away from the rotating shaft 6 .
  • the permanent magnets 31 SB and 31 SB for drawing in the magnetic field produced by the permanent magnet 31 SA are disposed on both sides of the line that passes the permanent magnets 31 SA and the rotating shaft 6 .
  • the flow of the magnetic field of the permanent magnets 31 SA is directed toward the permanent magnets 31 SB.
  • the permanent magnets 31 SA and the permanent magnets 31 SB are disposed to attract each other thereby to change the direction of the magnetic field in the rotor 5 so as to cause the magnetic field to pass through the rotor yoke 5 A excluding the rotating shaft 6 .
  • the magnetic flux of the rotor 5 in this case is 0.264 ⁇ 10 ⁇ 2 [Wb].
  • the magnetic field produced by the two permanent magnets 31 SA is formed such that it bypasses the rotating shaft 6 due to the presence of the permanent magnets 31 SB.
  • the magnetic flux density of the rotating shaft 6 ranges from about 0.03 teslas up to about 0.18 teslas, as shown in FIG. 31.
  • the magnetic field of the permanent magnets 31 avoids passing through the rotating shaft 6 , so that the rotating shaft 6 is hardly magnetized.
  • the voids 5 D only the void 5 D provided at the center between the two permanent magnets 31 and 31 may be provided.
  • Examples of the layout of the two-pole permanent magnets 31 are given by the rotors 5 shown in FIG. 32 through FIG. 37.
  • permanent magnets 31 SB, 31 SB and permanent magnets 31 NB, 31 NB are disposed on the right and left sides of the rotating shaft 6 of the rotor yoke 5 A such that they oppose each other.
  • These permanent magnets 31 SB, 31 SB and the permanent magnets 31 NB, 31 NB are laid out in “V” shapes such that they face toward the center of the rotating shaft 6 .
  • a pair of permanent magnets 31 are disposed, opposing each other, to have two poles, the one on the right side of the rotating shaft 6 carrying the south pole and the one on the left side thereof carrying the north pole.
  • permanent magnets 31 SB, 31 SB and permanent magnets 31 NB, 31 NB are further disposed in the rotor 5 of FIG. 32 such that they are inclined toward the rotating shaft 6 .
  • the permanent magnets provide two poles, the ones on the right side of the rotating shaft 6 carrying the south pole, while the ones on the left side thereof carrying the north pole.
  • two permanent magnets 31 are disposed in the rotor yoke 5 A substantially in “V” shapes such that they substantially form a diamond shape, laterally opposing each other, sandwiching the rotating shaft 6 .
  • the permanent magnet on the right side of the rotating shaft 6 carries the south pole, while the permanent magnet on the left side thereof carries the north pole.
  • the magnetization of the rotating shaft 6 caused by the magnetic forces of the permanent magnets 31 can be restrained by forming the voids 5 D, which is shown in FIG. 28, in the rotor yoke 5 A as described above, the voids being located at the central portion where the opposing permanent magnets 31 and 31 attract each other.
  • the rotor yoke 5 A is provided with eight permanent magnets 31 .
  • the permanent magnets 31 are disposed roughly radially, as observed from the rotating shaft 6 . More specifically, the permanent magnets 31 are arranged in an approximate radial pattern in two rows on each side with predetermined intervals provided among the permanent magnets and with a predetermined space laterally provided between the rows on the right side and the left side such that they oppose each other, sandwiching the rotating shaft 6 .
  • the permanent magnets carry two poles, the ones on the right side of the rotating shaft 6 carrying the south pole, while the ones on the left side thereof carrying the north pole.
  • FIG. 1 the permanent magnets 31 are disposed roughly radially, as observed from the rotating shaft 6 . More specifically, the permanent magnets 31 are arranged in an approximate radial pattern in two rows on each side with predetermined intervals provided among the permanent magnets and with a predetermined space laterally provided between the rows on the right side and the left side such that they oppose each other, sandwiching the rotating shaft 6
  • the permanent magnets 31 are arranged in an approximate radial pattern in three rows on each side with a predetermined interval laterally provided between the rows.
  • the permanent magnets carry two poles, the ones on the right side of the rotating shaft 6 carrying the south pole, while the ones on the left side thereof carrying the north pole.
  • the permanent magnets 31 are radially arranged substantially around the rotating shaft 6 , so that the magnetic field is directed away from the rotating shaft 6 , as illustrated in FIG. 30.
  • the magnetic field of the two permanent magnets 31 and 31 disposed to oppose the rotating shaft 6 bypasses the rotating shaft 6 ; therefore, the rotating shaft 6 will not be magnetized.
  • the rotor yoke 5 A is provided with six permanent magnets 31 . These permanent magnets 31 are laid out in a substantially hexagonal shape around the rotating shaft 6 .
  • the permanent magnets 31 have two poles, the ones on the right side of the rotating shaft 6 carrying the south pole, while the ones on the left side carrying the north pole.
  • the voids 5 D provided in the rotor 5 shown in FIG. 26 cause the magnetic fields of the two opposing permanent magnets 31 to pass the rotor yoke 5 A, bypassing the voids 5 D. As a result, the magnetic fields do not pass the rotating shaft 6 , so that the rotating shaft 6 is hardly magnetized.
  • Voids 32 shown in FIGS. 33, 34, and 37 intercept the magnetic field formed between the permanent magnets 31 on the south pole side and the permanent magnets 31 on the north pole side. The voids 32 , however, are dispensable.
  • the voids 5 D are formed at the central portion of the rotor yoke 5 A where the permanent magnets 31 and 31 , which oppose each other with the rotating shaft 6 sandwiched therebetween and attract each other, and the permanent magnets 31 are arranged such that the magnetic field does not pass through the rotating shaft 6 or the magnetic field bypasses the rotating shaft 6 .
  • the permanent magnets 31 are arranged such that the magnetic field does not pass through the rotating shaft 6 or the magnetic field bypasses the rotating shaft 6 .
  • the permanent magnets used with synchronous induction motors are magnetized in advance at a different place, then installed in rotors. For this reason, when inserting the magnetized permanent magnets in rotors, the permanent magnets attract each other, leading to poor workability. Furthermore, when inserting a rotor in a stator, the rotor is attracted to a surrounding surface, posing the problem of degraded assemblability of a synchronous induction motor.
  • the rotor 5 in this case is constructed of a rotor yoke 5 A, die-cast squirrel-cage secondary conductors 5 B positioned around the rotor yoke 5 A, a die-cast end ring 69 which is positioned on the peripheral portion of an end surface of the rotor yoke 5 A, annularly protrudes by a predetermined dimension, and integrally die-cast with the squirrel-cage secondary conductors 5 B, and permanent magnets 31 embedded in the rotor yoke 5 A.
  • the permanent magnets 31 are magnetized after permanent magnet materials are inserted in slots 44 , which will be discussed hereinafter.
  • the permanent magnets 31 ( 31 SA and 31 SB) embedded in one side (e.g., the right side in the drawing) from the rotating shaft 6 are polarized with the same south pole, while the permanent magnets 31 ( 31 NA and 31 NB) embedded in the other side (e.g., the left side in the drawing) are polarized with the same north pole, as shown in FIG. 38 and FIG. 39.
  • the plurality of squirrel-cage secondary conductors 5 B are provided on the peripheral portion of the rotor yoke 5 A and have aluminum diecast members injection-molded in cylindrical holes (not shown) formed in the cage in the direction in which the rotating shaft 6 extends, as described previously.
  • the squirrel-cage secondary conductors 5 B are formed in a so-called skew pattern in which they are spirally inclined at a predetermined angle in the circumferential direction of the rotating shaft 6 from one end toward the other end, as illustrated in FIG. 5.
  • the rotor yoke 5 A has a plurality of slots 44 (four in this embodiment) vertically formed with both ends open. The openings at both ends of the slots 44 are closed by a pair of the end surface members 66 and 67 , respectively, as shown in FIG. 7.
  • the end surface member 67 is fixed to the rotor yoke 5 A by the end ring 69 .
  • the end surface member 66 is secured to the rotor yoke 5 A by a plurality of rivets 66 A functioning as fixtures.
  • the openings are closed by the end surface member 66 , and the end surface member 66 is fixed by riveting into engaging holes 5 C provided in the rotor yoke 5 A by using the rivets 66 A.
  • the magnet constituents are formed of a rare earth type permanent magnet material of, for example, a praseodymium type permanent magnet or a neodymium type permanent magnet with nickel plating or the like provided on the surface thereof, or a ferrite material, that is capable of exhibiting high magnet characteristics even in a low magnetizing magnetic field.
  • the demagnetization during operation can be restrained by using, for example, a ferrite magnet or a rare earth type magnet (the coercive force at normal temperature being 1350 to 2150 kA/m and the coercive force temperature coefficient being 0.7%/° C. or less).
  • stator winding 7 If an unmagnetized magnet constituent is inserted in a rotor, and a stator winding is energized to magnetize the magnet constituent, the stator winding may be deformed by the electromagnetic force produced at the magnetization. For this reason, the stator winding 7 is coated with varnish or a sticking agent that fuses when heated. The varnish or the sticking agent that fuses when heated securely prevents the deformation of a winding end of the stator winding 7 and the degradation of the coating of the winding caused by heat if the stator winding 7 becomes hot from the heat generated by itself when the magnet constituent is magnetized.
  • the rotor 5 is provided with four permanent magnets 31 and 31 formed of the magnetized magnet constituents that oppose the rotating shaft 6 .
  • the opposing permanent magnets 31 and 31 are disposed with opposite magnetic poles, as shown in FIG. 40.
  • Permanent magnets 31 SA and 31 SB embedded in one side of the rotating shaft 6 (e.g., upper and lower on the right side in the drawing) from the rotating shaft 6 are polarized with the same south pole, while the permanent magnets 31 NA and 31 NB embedded in the other side (e.g., upper and lower on the left side in the drawing) are polarized with the same north pole.
  • the permanent magnets 31 SA, 31 SB and the permanent magnets 31 NA, 31 NB are disposed to substantially form a rectangular shape around the rotating shaft 6 , and are embedded such that they carry two poles, namely, the south pole and the north pole, outward in the circumferential direction of the rotating shaft 6 .
  • This enables torque to be applied to the rotor 5 by the magnetic forces of a primary winding 7 A and an auxiliary winding 7 B, which will be discussed hereinafter.
  • the layout of the permanent magnets 31 shown in FIG. 40 is different from the layout of the permanent magnets 31 shown in FIG. 38; however, the layout of the permanent magnets 31 shown in FIG. 40 may be replaced by the layout shown in FIG. 38. In this case, however, the riveting positions of the rivets 66 A have to be changed. Further alternatively, the permanent magnets 31 shown in FIG. 38 may be arranged as shown in FIG. 40.
  • FIG. 41 Another rotor 5 is shown in FIG. 41.
  • the rotor yoke 5 A has two magnet constituents embedded therein.
  • the two plate-like magnet constituents are arranged in parallel to each other, sandwiching the rotating shaft 6 and embedded in slots 44 vertically formed in the rotor yoke 5 A so that they penetrate the rotor yoke 5 A.
  • the magnet constituents are formed of a rare earth type or ferrite material, as mentioned above.
  • FIG. 46 a three-phase, two-pole synchronous induction motor 2 A will be described.
  • the synchronous induction motor 2 A is installed in the hermetic electric compressor C, as in the case of the synchronous induction motor 2 described above.
  • FIG. 46 is an electrical circuit diagram of the three-phase, two-pole synchronous induction motor 2 A.
  • the synchronous induction motor 2 A is equipped with a three-phase stator winding 75 constructed of a winding 75 A, a winding 75 B, and a winding 75 C.
  • the winding 75 A, the winding 75 B, and the winding 75 C of the stator winding 75 are connected to a three-phase alternating current commercial power source AC 3 through the intermediary of a power switch 77 .
  • Current-sensitive line current detectors 76 for detecting line current are provided on the lines connected to the winding 75 A, the winding 75 B, and the winding 75 C.
  • the power switch 77 functions also as a protective switch that cuts off the supply of power to the stator winding 7 if any of the line current detectors 76 senses a predetermined current. The rest of the configuration is as described above.
  • the two unmagnetized magnet constituents fixed in the slots 44 provided in the rotor yoke 5 A are magnetized by a predetermined voltage and a predetermined current supplied to one phase, two phases, or three phases of the stator winding.
  • the two opposing magnet constituents are magnetized into the permanent magnets 31 having opposite magnetic polarities.
  • the rotor 5 includes opposing permanent magnets 31 magnetized to have opposite magnetic polarities, namely, permanent magnets 31 SA on the right side and permanent magnets 31 NA on the left side.
  • FIG. 42 Another example of the rotor 5 is shown in FIG. 42.
  • the rotor yoke 5 A is provided with two magnet constituents.
  • the two magnet constituents are embedded in slots 44 vertically formed in the rotor yoke 5 A so that they penetrate the rotor yoke 5 A.
  • the magnet constituents are disposed in arcuate shapes inside the squirrel-cage secondary conductor 5 B with a predetermined interval allowed therebetween, and are embedded such that both ends of the two arcuate magnet constituents are close to each other.
  • the magnet constituents is formed of a rare earth type or ferrite material, as mentioned above.
  • the two unmagnetized magnet constituents fixed in the slots 44 provided in the rotor yoke 5 A are magnetized by a predetermined voltage and a predetermined current supplied to one phase, two phases, or three phases of the stator winding.
  • the two opposing magnet constituents are magnetized into the permanent magnets 31 having opposite magnetic polarities to constitute the rotor 5 .
  • the rotor 5 includes opposing permanent magnets 31 magnetized to have opposite magnetic polarities, namely, a permanent magnet 31 SA on the right side and a permanent magnet 31 NA on the left side.
  • FIG. 43 Another example of the rotor 5 is shown in FIG. 43.
  • the rotor yoke 5 A is provided with four magnet constituents.
  • the four magnet constituents are individually embedded in slots 44 vertically formed in the rotor yoke 5 A such that they penetrate the rotor yoke 5 A.
  • the magnet constituents are embedded inside the squirrel-cage secondary conductor 5 B such that two sets of permanent magnets 31 , each set consisting of two magnet constituents and shaping substantially like “V”, oppose each other, sandwiching the rotating shaft 6 .
  • the magnet constituents are arranged such that they form substantially a diamond shape, as observed from above.
  • the magnet constituents are formed of a rare earth type or ferrite material, as previously mentioned.
  • Voids 32 function to intercept the magnetic field formed between the south pole (permanent magnets 31 SA, 31 SB) and the north pole (permanent magnets 31 NA, 31 NB).
  • the voids 32 are dispensable.
  • the unmagnetized magnet constituents fixed in the slots 44 provided in the rotor yoke 5 A are magnetized by a predetermined voltage and a predetermined current supplied to one phase, two phases, or three phases of the stator winding.
  • the opposing sets of magnet constituents are magnetized into the sets of permanent magnets 31 carrying opposite magnetic polarities.
  • the rotor 5 includes opposing sets of permanent magnets 31 magnetized to have opposite magnetic polarities, namely, two upper and lower permanent magnet 31 SA and 31 SB on the right side and two upper and lower permanent magnet 31 NA and 31 NB on the left side.
  • FIG. 44 Another example of the rotor 5 is shown in FIG. 44.
  • the rotor yoke 5 A is provided with six magnet constituents.
  • the six magnet constituents are individually embedded in slots 44 vertically formed in the rotor yoke 5 A such that they penetrate the rotor yoke 5 A.
  • the magnet constituents are arranged inside the squirrel-cage secondary conductor 5 B such that two sets, each set consisting of three magnet constituents, oppose each other, sandwiching the rotating shaft 6 therebetween, and are shaped like a hexagon.
  • the magnet constituents are formed of a rare earth type or ferrite material, as previously mentioned.
  • the unmagnetized magnet constituents fixed in the slots 44 provided in the rotor yoke 5 A are magnetized by a predetermined voltage and a predetermined current supplied to one phase, two phases, or three phases of the stator winding.
  • the opposing sets of magnet constituents are magnetized into the sets of permanent magnets 31 carrying opposite magnetic polarities.
  • the rotor 5 includes opposing sets of permanent magnets 31 magnetized to have opposite magnetic polarities, namely, three permanent magnets 31 SA, 31 SB, and 31 SC on the right side and three permanent magnets 31 NA, 31 NB, and 31 NC on the left side.
  • FIG. 45 Another example of the rotor 5 is shown in FIG. 45.
  • the rotor yoke 5 A is provided with eight magnet constituents.
  • the eight magnet constituents are individually embedded in slots 44 vertically formed in the rotor yoke 5 A such that they penetrate the rotor yoke 5 A.
  • the magnet constituents are arranged inside the squirrel-cage secondary conductor 5 B such that two sets, each set consisting of four magnet constituents, oppose each other, sandwiching the rotating shaft 6 therebetween, and are shaped like an octagon.
  • the magnet constituents are formed of a rare earth type or ferrite material, as previously mentioned.
  • the unmagnetized magnet constituents fixed in the slots 44 provided in the rotor yoke 5 A are magnetized by a predetermined voltage and a predetermined current supplied to one phase, two phases, or three phases of the stator winding.
  • the opposing sets of magnet constituents are magnetized into the sets of permanent magnets 31 carrying opposite magnetic polarities.
  • the rotor 5 includes opposing sets of permanent magnets 31 magnetized to have opposite magnetic polarities, namely, four permanent magnets 31 SA, 31 SB, 31 SC, and 31 SD on the right side and four permanent magnets 31 NA, 31 NB, 31 NC, and 31 ND on the left side.
  • An air conditioner or an electric refrigerator or the like requires large motion torque at the time of start-up, so that it incorporates a motor that provides larger motion torque than steady motion torque required for normal operation.
  • Increasing the motion torque for starting a synchronous induction motor inevitably increases power consumed during normal operation. Therefore, the motion torque for starting the motor used in a hermetic electric compressor constituting a refrigerating cycle of a refrigerator or an air conditioner has not been entirely adequate in achieving higher efficiency to meet recent energy regulations. For this reason, there has been demand for developing a drive unit for a synchronous induction motor that consumes less power during normal operation and secures sufficient motion torque at a start-up at the same time.
  • FIG. 47 is an electrical circuit diagram of a drive unit T 1 of a synchronous induction motor 2 that exhibits the aforesaid features.
  • the synchronous induction motor 2 that receives power from a single-phase alternating current commercial power source AC is equipped with a stator winding 7 constructed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a socket terminal 51 .
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a socket terminal 51 and an operating capacitor 47 .
  • a power switch 49 is constituted by a current-sensitive type line current sensor for detecting line current and an overload relay that serves also as a protective switch used to supply power from the single-phase alternating current commercial power source AC to the stator winding 7 and to cut off the supply of power to the stator winding 7 .
  • the operating capacitor 47 is set to have a capacitance suited for start-up and steady operation of the synchronous induction motor 2 .
  • the parallel circuit of the operating capacitor 47 and the primary winding 7 A is connected to the auxiliary winding 7 B.
  • the synchronous induction motor 2 obtains a start-up motion torque to start running.
  • the synchronous induction motor 2 continues its steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the operating capacitor 47 serves also as a start-up capacitor.
  • FIG. 48 is an electrical circuit diagram of another drive unit T 2 for a synchronous induction motor 2 .
  • the synchronous induction motor 2 receiving power from a single-phase alternating current commercial power source AC is also equipped with a stator winding 7 constructed of a primary winding 7 A and an auxiliary winding 7 B.
  • the stator winding 7 is connected to the single-phase alternating current commercial power source AC through the intermediary of a power switch 49 .
  • the primary winding 7 A connected to one end of the single-phase alternating current commercial power source AC is connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a socket terminal 51 .
  • the auxiliary winding 7 B connected to one end of the single-phase alternating current commercial power source AC is connected to the power switch 49 through the intermediary of the socket terminal 51 and a relay coil 45 A of a start-up relay 45 .
  • the auxiliary winding 7 B is connected in series to the other end of the single-phase alternating current commercial power source AC through the intermediary of a socket terminal 51 , a start-up relay contact 45 B of the start-up relay 45 , and a start-up capacitor 48 .
  • the operating capacitor 47 is connected in parallel to the start-up relay contact 45 B and the start-up capacitor 48 .
  • the operating capacitor 47 is set to provide a capacitance suited for steady operation. In a state wherein the operating capacitor 47 and the start-up capacitor 48 are connected in parallel, the capacitors 47 and 48 are set to capacitances suited for a start-up. Very little current passes the relay coil 45 A at an operation start when large current passes through the synchronous induction motor 2 .
  • the start-up relay contact 45 B When the synchronous induction motor 2 moves to its steady operation with the start-up relay contact 45 B closed, current passes through the relay coil 45 A, and the start-up relay contact 45 B is opened, isolating the start-up capacitor 48 .
  • the synchronous induction motor 2 shifts to its steady operation, the current passing through the auxiliary winding 7 B decreases, causing current to pass through the relay coil 45 A.
  • the magnetomotive force of the relay coil 45 A turns the power switch 49 OFF to isolate the start-up capacitor 48 .
  • the synchronous induction motor 2 continues its steady operation by the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the use of the start-up relay 45 may be replaced by current control based on a thyristor.
  • FIG. 49 is an electrical circuit diagram of another drive unit T 3 for the synchronous induction motor 2 .
  • the synchronous induction motor 2 receiving power from a single-phase alternating current commercial power source AC is also equipped with a stator winding 7 constructed of a primary winding 7 A and an auxiliary winding 7 B.
  • the stator winding 7 is connected to the single-phase alternating current commercial power source AC through the intermediary of a power switch 49 .
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the single-phase alternating current commercial power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a positive thermistor 46 (hereinafter referred to as “PTC).
  • An operating capacitor 47 is connected in parallel to the PTC 46 .
  • the PTC 46 is a semiconductor device whose resistance value increases with increasing temperature. The resistance value of the PTC 46 is low when the synchronous induction motor 2 is started, but it increases as the PTC 46 generates heat due to the passage of current.
  • FIG. 50 is an electrical circuit diagram of another drive unit T 4 for the synchronous induction motor 2 .
  • the construction of the drive unit T 4 is the same as that shown in FIG. 9. The construction will be explained again in detail.
  • the synchronous induction motor 2 receiving power from a single-phase alternating current commercial power source AC is also equipped with a stator winding 7 constructed of a primary winding 7 A and an auxiliary winding 7 B.
  • the stator winding 7 is connected to the single-phase alternating current commercial power source AC through the intermediary of a power switch 49 .
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the single-phase alternating current commercial power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected in series to the other end of the single-phase alternating current commercial power source AC through the intermediary of a PTC 46 and a start-up capacitor 48 .
  • An operating capacitor 47 is connected in parallel to the PTC 46 and the start-up capacitor 48 .
  • This energization causes the PTC 46 to start self-heating, and the resistance value of the PTC 46 increases accordingly until very little current passes through the PTC 46 itself.
  • the start-up capacitor 48 is isolated, and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B by the operating capacitor 47 .
  • FIG. 51 shows the relationship between rotating torque T provided by the electric circuit of each of the drive units T 1 , T 2 , T 3 , and T 4 set forth above, and a number of revolutions n.
  • the axis of ordinates indicates a rotating torque T
  • the rotating torque T is the smallest at the bottom, and is higher at a higher level.
  • the axis of abscissa indicates the number of revolutions n, the left end thereof being the smallest number of revolutions n, while the right end being the largest number of revolutions n.
  • the two-dot chain curve denotes the rotating torque T in relation to the number of revolutions n of the drive unit T 1
  • the solid-line curve denotes the rotating torque T in relation to the number of revolutions n of the drive unit T 3
  • the dashed line curve denotes the rotating torque T in relation to the number of revolutions n of the drive unit T 4
  • the one-dot chain curve denotes the rotating torque T in relation to the number of revolutions n of the drive unit T 2 .
  • the drive unit T 1 having a single capacitor that serves as the starting capacitor 48 and the operating capacitor 47 exhibits low start-up operating torque and low steady operating torque.
  • the drive unit T 1 obviates the need for the start-up relay 45 and other elements, so that it is used with an air conditioner or other equipment, such as an electric refrigerator, that has relatively low start-up operating torque and steady operating torque.
  • the drive unit T 2 that switches between the start-up capacitor 48 and the operating capacitor 47 by the start-up relay 45 provides higher start-up operating torque.
  • the drive unit T 2 performs the same operation as that of the drive unit T 3 at the rotating torque T in relation to the number of revolutions n.
  • the drive unit T 2 provides higher operating torque for start-up and higher operating torque for steady operation, so it is used with an air conditioner or other equipment, such as an electric refrigerator, that has relatively high start-up operating torque and steady operating torque.
  • the drive unit T 3 that uses the PTC 46 , which is a semiconductor device whose resistance value increases with increasing temperature, and the operating capacitor 47 provides a higher start-up rotating torque than the drive unit T 1 .
  • the drive unit T 3 obviates the need for the start-up relay 45 and other devices, and secures higher reliability. This makes it possible to allow a higher operating torque to be obtained at the start-up of the synchronous induction motor 2 , and to reduce the power consumed during normal operation, thus enabling the synchronous induction motor 2 to be operated with extremely high efficiency.
  • the drive unit T 3 therefore, is used with an air conditioner or other equipment, such as an electric refrigerator, that has relatively low start-up operating torque and steady operating torque and is required to exhibit high reliability.
  • the drive unit T 4 that uses the PTC 46 , which is a semiconductor device whose resistance value increases with increasing temperature, the start-up capacitor 48 , and the operating capacitor 47 provides a still higher start-up rotating torque T than the drive unit T 3 , permitting even higher reliability to be achieved.
  • the drive unit T 4 therefore, is used with an air conditioner or other equipment, such as an electric refrigerator, that has relatively high start-up operating torque and steady operating torque and is required to exhibit high reliability.
  • FIG. 52 is a refrigerant circuit of an air conditioner or other equipment, such as an electric refrigerator, that uses a hermetic electric compressor C incorporating a synchronous induction motor 2 .
  • the refrigerant circuit has added a liquid injection circuit 58 to the refrigerant circuit shown in FIG. 8.
  • a receiver tank 29 provided in the refrigerant circuit is connected to a compressor 3 of the hermetic electric compressor C through the intermediary of a strainer 52 , a solenoid valve 53 , and a capillary tube 54 .
  • the solenoid valve 53 is connected to a thermosensor 57 connected to a pipe 27 located at the discharge end of the compressor 3 , and the opening degree thereof is automatically adjusted according to the temperature detected by the thermosensor 57 .
  • the compressor 3 of the hermetic electric compressor C is driven, the refrigerant sealed in the refrigerant circuit is drawn in through a suction pipe 23 and compressed in steps by a first rotary cylinder 9 and a second rotary cylinder 10 , then discharged into the pipe 27 through a discharge pipe 22 .
  • the compressed gas refrigerant discharged into the pipe 27 flows into a condenser 28 wherein it radiates heat and condenses into a liquid refrigerant which flows into the receiver tank 29 .
  • the liquid refrigerant discharged into the compressor 3 evaporates therein when it absorbs heat so as to cool the compressor 3 . This restrains a temperature rise in the compressor 3 in a cooling operation mode thereby to protect the compressor 3 .
  • the rest of the operation is the same as previously described.
  • the stator winding constituting the synchronous induction motor of this type of hermetic electric compressor is thermally protected primarily by actuating a thermostat wrapped around the stator winding to cut off the supply of power to the synchronous induction motor.
  • a temperature sensor is attached to the discharge pipe or the suction pipe of the hermetic electric compressor or to the outer surface of the hermetic vessel, and if the temperature of the hermetic electric compressor reaches a preset value or more, a protective switch is actuated by the temperature sensor to cut off the supply of power to the synchronous induction motor so as to protect the hermetic electric compressor.
  • FIG. 53 through FIG. 66 a hermetic electric compressor capable of restraining a rise in temperature of the stator winding and of securely preventing permanent magnets from being thermally demagnetized will be described.
  • a hermetic vessel 1 of a hermetic electric compressor C is divided into two parts, namely, a cylindrical shell 1 A having an open upper end and an end cap 1 B that closes the open upper end.
  • An electric unit and a compression unit (hereinafter referred to as “the synchronous induction motor 2 ” and “the compressor 3 ”) are housed in the shell 1 A, the end cap 1 B is attached to the shell 1 A so as to cover the shell 1 A, then they are sealed by high-frequency welding or the like.
  • the hermetic electric compressor C is provided with a thermistor 46 serving as a thermal protective device whose resistance value changes with temperature.
  • the thermistor 46 is attached to a stator winding 7 provided in the hermetic vessel 1 of the hermetic electric compressor C.
  • the thermistor 46 is secured to the stator winding 7 by a polyester yarn 70 binding the coil end of the stator winding 7 .
  • the thermistor 46 is connected to a connection terminal 71 provided on the end cap 1 B of the hermetic vessel 1 by a lead wire 72 , as shown in FIG. 53.
  • FIG. 54 is an electrical circuit diagram of the synchronous induction motor 2 in this embodiment.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC, is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • One end of the auxiliary winding 7 B is connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a contact 61 B of a start-up relay 61 and start-up capacitors 48 and 48 .
  • These contact 61 B and the start-up capacitors 48 and 48 are connected in series, and the operating capacitor 47 is connected in parallel to the contact 61 B and the start-up capacitors 48 and 48 .
  • the operating capacitor 47 is set to a capacitance suited for steady operation. In the state wherein the operating capacitor 47 and the start-up capacitors 48 and 48 are connected in parallel, the capacitors 47 , 48 , and 48 are set to capacitances suited for start-up.
  • Reference numerals 48 A and 48 A denote discharge resistors for discharging currents charged in the start-up capacitors 48 and 48
  • reference numeral 61 A denotes a start-up relay coil
  • reference character PSW denotes a power switch.
  • a control relay 49 is provided that is connected between the power switch PSW and the stator winding 7 and provided with a control relay contact 49 B to supply power from the single-phase alternating current commercial power source AC to the stator winding 7 and to cut off the supply of power to the stator winding 7 .
  • a controller 62 controls the supply of power to the synchronous induction motor 2 according to a change in the resistance value of the thermistor 46 .
  • the controller 62 is connected to the thermistor 46 secured to the stator winding 7 and also connected to a control relay coil 49 A of the control relay 49 .
  • Connected to the controller 62 is a current-sensitive line current detector 63 that is connected to one end of the single-phase alternating current commercial power source AC and that functions as an overload protective device for detecting line current.
  • the contact 61 B opens after a while to isolate the start-up capacitors 48 and 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or enabling the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot.
  • the temperature of the stator winding 7 rises accordingly. This causes the resistance value of the thermistor 46 to change, and the temperature rise in the stator winding 7 is detected. If the detected temperature is higher than a preset temperature level, then the controller 62 detects that the temperature of the stator winding 7 is higher than the preset level, and passes current through the control relay coil 49 A to open the control relay contact 49 B thereby to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before the stator winding 7 generates abnormal heat while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 .
  • the controller 62 causes current to the control relay coil 49 A to open the control relay contact 49 B so as to interrupt the supply of power to the stator winding 7 if it detects that the temperature of the stator winding 7 is higher than a preset temperature.
  • the controller 62 may control the supply of power to the synchronous induction motor 2 to reduce the number of revolutions thereof or to shut off the supply of power to the synchronous induction motor 2 if the temperature of the hermetic electric compressor C rises and exceeds a preset temperature level.
  • the line current detector 63 detects the large current flow. If the detected current is larger than a preset current level, then the controller 62 detects the large current flow into the stator winding 7 , and passes current through the control relay coil 49 A to open the control relay contact 49 B so as to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted so as to protect the synchronous induction motor 2 before an overloaded operation of the hermetic electric compressor C is continued, which would lead to damage to the hermetic electric compressor C.
  • the controller 62 shuts off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 in response to a signal issued by the thermistor 46 or the line current detector 63 , whichever issued the detection signal first.
  • FIG. 55 is a longitudinal sectional side view of a part of another hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 55 is equipped with a bimetal switch 64 as a thermal protector that opens and closes a contact at a predetermined temperature.
  • the bimetal switch 64 is secured to the stator winding 7 by a polyester yarn 70 for binding a coil end of the stator winding 7 .
  • the bimetal switch 64 is connected between a hermetic terminal 25 provided on the end cap 1 B of the hermetic vessel 1 and the stator winding 7 , and it cuts off the supply of power from the single-phase alternating current commercial power source AC to the stator winding 7 by opening the contact 61 B if the temperature of the stator winding 7 exceeds a predetermined temperature level.
  • FIG. 56 is an electrical circuit diagram of the synchronous induction motor 2 of the hermetic electric compressor C shown in FIG. 55.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC through the intermediary of the bimetal switch 64 , is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • One end of the auxiliary winding 7 B is also connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a contact 61 B of a start-up relay 61 and start-up capacitors 48 and 48 .
  • These contact 61 B and the start-up capacitors 48 and 48 are connected in series, and the operating capacitor 47 is connected in parallel to the contact 61 B and the start-up capacitors 48 and 48 .
  • the operating capacitor 47 is set to a capacitance suited for steady operation. In the state wherein the operating capacitor 47 and the start-up capacitors 48 and 48 are connected in parallel, the capacitors 47 , 48 , and 48 are set to capacitances suited for start-up.
  • Reference numerals 48 A and 48 A denote discharge resistors for discharging currents charged in the start-up capacitors 48 and 48
  • reference numeral 61 A denotes a start-up relay coil.
  • the contact 61 B opens after a while to isolate the start-up capacitors 48 and 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot. As the compressor 3 becomes hot, the temperature of the stator winding 7 rises accordingly.
  • the bimetal switch 64 detects the temperature of the stator winding 7 . If the detected temperature is higher than a preset temperature level, then the bimetal switch 64 opens the contact to interrupt the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before the stator winding 7 generates abnormal heat while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 and to protect the hermetic electric compressor C from damage due to abnormal heat generation.
  • FIG. 57 is a longitudinal sectional side view of a part of another hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 57 is equipped with a bimetal switch 64 as a thermal protector that opens and closes a contact at a predetermined temperature, as mentioned above.
  • the bimetal switch 64 is directly connected to a hermetic terminal 25 that extends into a hermetic vessel 1 .
  • the bimetal switch 64 is connected between the hermetic terminal 25 provided on the end cap 1 B of the hermetic vessel 1 and the stator winding 7 , and it cuts off the supply of power from the single-phase alternating current commercial power source AC to the stator winding 7 by opening the contact if the temperature in the hermetic vessel 1 exceeds a predetermined temperature level.
  • the electrical circuit diagram of the hermetic electric compressor C is the same as that shown in FIG. 56.
  • the contact 61 B opens after a while to isolate the start-up capacitors 48 and 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and becomes hot.
  • the temperature of the stator winding 7 rises, and the temperature inside the end cap 1 B also rises accordingly.
  • the bimetal switch 64 detects the temperature. If the detected temperature inside the end cap 1 B is higher than a preset temperature level, then the contact is opened to interrupt the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before the stator 4 or the stator winding 7 generates abnormal heat while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 and to protect the hermetic electric compressor C from damage due to abnormal heat generation.
  • FIG. 58 is a longitudinal sectional side view of a part of yet another hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 58 is equipped with a thermostat 65 as a thermal protector that opens and closes a contact at a predetermined temperature.
  • the thermostat 65 is connected to a connecting terminal 71 provided on the end cap 1 B of a hermetic vessel 1 by a lead wire 72 , and it cuts off the supply of power from the single-phase alternating current commercial power source AC to the stator winding 7 by opening the contact if the temperature in the hermetic vessel 1 exceeds a predetermined temperature level.
  • FIG. 59 shows an electrical circuit diagram of the synchronous induction motor 2 of the hermetic electric compressor C shown in FIG. 58.
  • reference numeral 65 denotes the thermostat.
  • the rest of FIG. 59 is the same as FIG. 54.
  • a power switch PSW is turned ON with a control relay contact 49 B closed, current is supplied from the single-phase alternating current commercial power source AC to the primary winding 7 A and the auxiliary winding 7 B.
  • current passes through a start relay coil 61 A, causing the contact 61 B to close.
  • the auxiliary winding 7 B obtains start-up torque from the current phase difference between itself and the primary winding 7 A produced by the operating capacitor 47 and the start-up capacitors 48 and 48 connected in parallel thereto, thus causing the synchronous induction motor 2 to start running.
  • the contact 61 B opens after a while to isolate the start-up capacitors 48 and 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or enabling the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot.
  • the temperature inside the end cap 1 B also rises. This causes the thermostat 65 to detect the temperature inside the end cap 1 B, and if the detected temperature is higher than a preset temperature level, the contact thereof is closed. The moment the contact of the thermostat 65 is closed, the controller 62 causes current to pass through the control relay coil 49 A to open the control relay contact 49 B thereby to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before abnormal heat is generated inside the end cap 1 B while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 .
  • the line current detector 63 detects the large current flow. If the detected current is larger than a preset current level, then the controller 62 detects the large current flow into the stator winding 7 , and passes current through the control relay-coil 49 A to open the control relay contact 49 B to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted so as to protect the synchronous induction motor 2 before an overloaded operation of the hermetic electric compressor C is continued, which would lead to damage to the hermetic electric compressor C.
  • the controller 62 shuts off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 in response to a signal issued by the thermostat 65 or the line current detector 63 , whichever issued the detection signal first.
  • FIG. 60 is a longitudinal sectional side view of a part of a further hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 60 is provided with a thermostat 65 whose resistance value changes with temperature.
  • the thermostat 65 is secured to the stator winding 7 by a polyester yarn 70 for binding a coil end of the stator winding 7 .
  • the thermostat 65 is connected, by a lead wire 72 , also to a connecting terminal 71 provided on the end cap 1 B of the hermetic vessel 1 .
  • FIG. 61 is an electrical circuit diagram of the synchronous induction motor 2 of the hermetic electric compressor C shown in FIG. 60.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • One end of the auxiliary winding 7 B is also connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a contact 61 B of a start-up relay 61 and start-up capacitors 48 and 48 .
  • These contact 61 B and the start-up capacitors 48 and 48 are connected in series, and the operating capacitor 47 is connected in parallel to the contact 61 B and the start-up capacitors 48 and 48 .
  • the operating capacitor 47 is set to a capacitance suited for steady operation. In the state wherein the operating capacitor 47 and the start-up capacitors 48 and 48 are connected in parallel, the capacitors 47 , 48 , and 48 are set to capacitances suited for start-up.
  • Reference numerals 48 A and 48 A denote discharge resistors for discharging currents charged in the start-up capacitors 48 and 48
  • reference numeral 61 A denotes a start-up relay coil
  • PSW denotes a power switch.
  • a control relay 49 is provided that is connected between the power switch PSW and the stator winding 7 and that serves also as a protective switch for supplying power from the single-phase alternating current commercial power source AC to the stator winding 7 and to cut off the supply of power to the stator winding 7 .
  • One end of the thermostat 65 secured to the stator winding 7 is connected to one end of the single-phase alternating current commercial power source AC through the intermediary of a relay coil 49 A of the control relay 49 and an overload switch 73 functioning as an overload protector.
  • the other end of the thermostat 65 is connected to the other end of the single-phase alternating current commercial power source AC.
  • Reference numeral 49 B denotes switch contacts that cause current to pass through a control relay coil 49 A so as to open the control relay 49 if a predetermined overload current flows into the overload switch 73 .
  • the contact 61 B opens after a while to isolate the start-up capacitors 48 and 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or enabling the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot.
  • the temperature of the stator winding 7 rises accordingly.
  • the thermostat 65 detects the temperature, and if the detected temperature is higher than a preset temperature level, then the contact is closed. This causes current to pass through the control relay coil 49 A to open the control relay contacts 49 B thereby to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before abnormal heat is generated inside the end cap 1 B while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 .
  • the overload switch 73 detects the overload current. If the detected current exceeds a preset current value, then the overload switch 73 passes current through the control relay coil 49 A to open the control relay contacts 49 B so as to cut off the supply of power to the stator winding 7 . This makes it possible to cut off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 before the hermetic electric compressor C is damaged due to an overloaded operation of the hermetic electric compressor C.
  • the supply of power to the stator winding 7 is interrupted in order to protect the synchronous induction motor 2 in response to a signal issued by the thermostat 65 or the overload switch 73 , whichever issued the detection signal first.
  • FIG. 62 is a longitudinal sectional side view of a part of still another hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 62 is equipped with an overload switch 73 as an overload protector.
  • the overload switch 73 is secured to the end cap 1 B of a hermetic vessel 1 . More specifically, the overload switch 73 is secured to a hermetic terminal 25 on the end surface of the hermetic vessel 1 , and opens a contact (not shown) to cut off the supply of power to the stator winding 7 if a predetermined overload current passes.
  • Reference numeral 74 denotes a cover for protecting the hermetic terminal 25 and the overload switch 73
  • reference numeral 75 denotes a nut for securing the cover 74 .
  • FIG. 63 is an electrical circuit diagram of the synchronous induction motor 2 of the hermetic electric compressor C shown in FIG. 62.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC through the intermediary of the overload switch 73 is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • One end of the auxiliary winding 7 B is also connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a contact 61 B of a start-up relay 61 and a start-up capacitor 48 .
  • These contact 61 B and the start-up capacitor 48 are connected in series, and the operating capacitor 47 is connected in parallel to the contact 61 B and the start-up capacitor 48 .
  • the operating capacitor 47 is set to a capacitance suited for steady operation. In the state wherein the operating capacitor 47 and the start-up capacitor 48 are connected in parallel, the capacitors 47 and 48 are set to capacitances suited for start-up.
  • Reference numeral 48 A denotes a discharge resistor for discharging current charged in the start-up capacitor 48
  • reference numeral 61 A denotes a start-up relay coil
  • PSW denotes a power switch.
  • the contact 61 B opens after a while to isolate the start-up capacitor 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or enabling the refrigerator to effect cooling therein.
  • the overload switch 73 detects the overload current. If the detected current exceeds a preset current value, then the overload switch 73 causes the contact to open so as to cut off the supply of power to the stator winding 7 . More specifically, if overload current flows into the stator winding 7 , then the overload switch 73 opens the contact thereby to interrupt the supply of power from the single-phase alternating current commercial power source AC to the stator winding 7 . This makes it possible to cut off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 before the hermetic electric compressor C is damaged due to an overloaded operation of the hermetic electric compressor C.
  • FIG. 64 is a longitudinal sectional side view of a part of still another hermetic electric compressor C (the part being in the vicinity of an end cap 1 B).
  • the hermetic electric compressor C shown in FIG. 64 is equipped with a thermostat 65 functioning as an overload protector that opens/closes a contact at a predetermined temperature.
  • the thermostat 65 is secured to the end cap 1 B, which is an outer surface of a hermetic vessel 1 . More specifically, the thermostat 65 is secured to the a hermetic terminal 25 on the end surface of the hermetic vessel 1 , and opens/closes a contact according to the temperature of the end cap 1 B.
  • Reference numeral 74 denotes a cover for protecting the hermetic terminal 25 and the thermostat 65
  • reference numeral 75 denotes a nut for securing the cover 74 .
  • FIG. 65 is an electrical circuit diagram of the synchronous induction motor 2 of the hermetic electric compressor C shown in FIG. 64.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC through the intermediary of the overload switch 73 and the thermostat 65 is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • One end of the auxiliary winding 7 B is also connected to the other end of the single-phase alternating current commercial power source AC through the intermediary of a contact 61 B of a start-up relay 61 and a start-up capacitor 48 .
  • These contact 61 B and the start-up capacitor 48 are connected in series, and the operating capacitor 47 is connected in parallel to the contact 61 B and the start-up capacitor 48 .
  • the operating capacitor 47 is set to a capacitance suited for steady operation. In the state wherein the operating capacitor 47 and the start-up capacitor 48 are connected in parallel, the capacitors 47 and 48 are set to capacitances suited for start-up.
  • Reference numeral 48 A denotes a discharge resistor for discharging current charged in the start-up capacitor 48
  • reference numeral 61 A denotes a start-up relay coil
  • PSW denotes a power switch.
  • the contact 61 B opens after a while to isolate the start-up capacitor 48 , and the synchronous induction motor 2 continues steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the running synchronous induction motor 2 operates the hermetic electric compressor C, thus enabling an air conditioner to effect air conditioning in the room wherein the air conditioner is installed, or enabling the refrigerator to effect cooling therein.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot.
  • the temperature of the end cap 1 B rises accordingly.
  • the thermostat 65 detects the temperature of the end cap 1 B, and if the temperature of the end cap 1 B is higher than a preset temperature level, then the contact is opened. This interrupts the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be shut off before abnormal heat is generated inside the end cap 1 B while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 .
  • the overload switch 73 detects the overload current. If the detected current exceeds a preset current value, then the overload switch 73 opens the contact so as to cut off the supply of power to the stator winding 7 . This makes it possible to cut off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 before the hermetic electric compressor C is damaged due to an overloaded operation of the hermetic electric compressor C.
  • the supply of power to the stator winding 7 is interrupted in order to protect the synchronous induction motor 2 in response to a signal issued by the thermostat 65 or the overload switch 73 , whichever issued the detection signal first.
  • FIG. 66 is an electrical circuit diagram of another synchronous induction motor 2 of the hermetic electric compressor C.
  • a thermostat 65 is secured to the outer surface of the hermetic vessel 1 , as in the case of the compressor shown in FIG. 64.
  • the synchronous induction motor 2 which receives power from a single-phase alternating current commercial power source AC is equipped with a stator winding 7 formed of a primary winding 7 A and an auxiliary winding 7 B.
  • One end of the primary winding 7 A is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC.
  • One end of the auxiliary winding 7 B is connected to one end of the single-phase alternating current commercial power source AC, and the other end thereof is connected to the other end of the power source AC through the intermediary of an operating capacitor 47 .
  • the operating capacitor 47 is set to a capacitance suited for start-up and steady operation of the synchronous induction motor 2 .
  • a control relay 49 is provided which is connected between the power switch PSW and the stator winding 7 and which acts also as a protective switch for supplying power from the single-phase alternating current commercial power source AC to the stator winding 7 and for cutting off the supply of power to the stator winding 7 .
  • a controller 62 is connected to the thermostat 65 secured to the end cap 1 B and also connected to a control relay coil 49 A of the control relay 49 .
  • Connected to the controller 62 is a current-sensitive line current detector 63 that is connected to one end of the single-phase alternating current commercial power source AC and that functions as an overload protector for detecting line current.
  • Reference numeral 49 B denotes a control relay contact.
  • the power switch PSW When the power switch PSW is turned ON to supply power from the single-phase alternating current commercial power source AC to the stator winding 7 , a parallel circuit of the operating capacitor 47 and the primary winding 7 A is connected to the auxiliary winding 7 B.
  • the auxiliary winding 7 B obtains start-up operating torque produced by the current phase difference between the primary winding 7 A and the auxiliary winding 7 B, thus causing the synchronous induction motor 2 to start running.
  • the synchronous induction motor 2 then shifts to the steady operation from the current phase difference between the primary winding 7 A and the auxiliary winding 7 B produced by the operating capacitor 47 .
  • the operating capacitor 47 serves also as a start-up capacitor.
  • the temperature of the compressor 3 rises and the compressor 3 becomes hot.
  • the temperature of the end cap 1 B (the outer surface of the hermetic vessel 1 ) rises accordingly.
  • the thermostat 65 detects the temperature of the outer surface of the hermetic vessel 1 , and if the detected temperature is higher than a preset temperature level, then the contact is closed. This causes the controller 62 to detect that the temperature of the outer surface of the hermetic vessel 1 is higher than the preset temperature and to pass current through the control relay coil 49 A to open the control relay contact 49 B thereby to cut off the supply of power to the stator winding 7 .
  • the supply of power to the stator winding 7 can be interrupted before the hermetic vessel 1 develops abnormal heat while the hermetic electric compressor C is in operation, thus making it possible to securely restrain damage to the stator winding 7 and the thermal demagnetization of the permanent magnets 31 .
  • the line current detector 63 detects the large current flow. If the detected current is larger than a preset current level, then the controller 62 passes current through the control relay coil 49 A to open the control relay contact 49 B so as to cut off the supply of power to the stator winding 7 . With this arrangement, the supply of power to the stator winding 7 can be interrupted so as to protect the synchronous induction motor 2 before an overloaded operation of the hermetic electric compressor C is continued, which would lead to damage to the stator winding 7 . The controller 62 shuts off the supply of power to the stator winding 7 to protect the synchronous induction motor 2 in response to a signal issued by the thermostat 65 or the line current detector 63 , whichever issued the detection signal first.
  • the controller 62 incorporates a timer.
  • the controller 62 is adapted to restart the supply of current to the synchronous induction motor 2 after waiting for the elapse of a predetermined delay time since the supply of current to the synchronous induction motor 2 was cut off. This means that the controller 62 waits for the predetermined time counted by the timer before it restarts the supply of current to the synchronous induction motor 2 after the supply of current to the synchronous induction motor 2 was cut off.
  • the predetermined delay time is allowed before the supply of power to the synchronous induction motor 2 is restarted after the power to the synchronous induction motor was cut off, it is possible to restrain the rotor 5 from becoming hot due to, for example, frequent repetition of energizing and de-energizing of the synchronous induction motor 2 because of a starting failure of the synchronous induction motor 2 .
  • This arrangement make it also possible to restrain the demagnetization of the permanent magnets 31 embedded in the rotor 5 caused by the heat generated in the rotor 5 .
  • the hermetic electric compressor C is provided with the thermal protector (the thermistor 46 , the bimetal switch 64 , or the thermostat 65 ) to cut off the supply of power to the synchronous induction motor 2 in response to a predetermined temperature rise.
  • the supply of power to the stator winding 7 can be interrupted before the stator winding 7 generates abnormal heat while the hermetic electric compressor C is running.
  • This arrangement makes it possible to restrain the demagnetization of the permanent magnets 31 embedded in the rotor yoke 5 A caused by a temperature rise, permitting dramatically improved reliability of the hermetic electric compressor C.
  • the hermetic electric compressor C is provided with the overload protector (the line current detector 63 or the overload switch 73 ) to cut off the supply of power to the synchronous induction motor 2 in response to a predetermined overload current.
  • the overload protector the line current detector 63 or the overload switch 73 to cut off the supply of power to the synchronous induction motor 2 in response to a predetermined overload current.
  • the stainless steel plates have been used for the end surface members 66 and 67 holding the permanent magnets 31 .
  • using aluminum plates that allow further easier passage of current for the end surface members 66 and 67 will permit a reduction in the secondary resistance, leading to significantly higher operational performance.
  • the rotary compressor has been used as an example of the hermetic electric compressor C; however, the present invention is not limited thereto.
  • the present invention may be also effectively applied to a hermetic scroll compressor constituted by a pair of meshed scrolls.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein one of the end surface members is secured to the rotor yoke by one of the end rings when the secondary conductors and end rings are formed, and the other end surface member is secured to the rotor yoke by a fixture. Therefore, one of the end surface members can be secured to the rotor yoke at
  • the permanent magnets can be secured to the rotor merely by securing the other end surface member to the rotor yoke by a fixture. It is therefore possible to reduce the number of steps for installing the permanent magnets and to improve the assemblability, permitting the overall productivity of synchronous induction motors to be dramatically improved.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein a non-magnetic member is disposed in contact with the inner sides of the two end rings to secure the two end surface members by pressing them against the rotor yoke by the non-magnetic member.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein a balancer formed into a predetermined shape beforehand is secured by a fixture to the rotor yoke together with the end surface member. Therefore, the ease of installation of the balancer can be considerably improved. With this arrangement, it is no longer necessary to secure the permanent magnets and the balancer separately, with consequent greater ease of installation. This permits dramatically improved productivity of the
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members which is formed of a non-magnetic material and which closes the openings of both ends of the slots, wherein a plurality of laminated sheet balancers is secured by a fixture to the rotor yoke together with the end surface member.
  • the synchronous induction motor is provided with a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, wherein at least one of the end surface members and a balancer are formed into one piece.
  • the number of components can be reduced. This permits simpler installation of the end surface members, resulting in dramatically improved productivity.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots, and a balancer secured by being press-fitted to the inner side of at least one of the end rings.
  • the installation of the balancer can be simplified. This arrangement makes it possible to significantly improve the productivity of the synchronous induction motor.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a plurality of secondary conductors which is positioned around a rotor yoke constituting the rotor and which is formed by die casting, end rings which are positioned on the peripheral portions of both end surfaces of the rotor yoke and which are integrally formed with the secondary conductors by die casting, permanent magnets inserted in slots formed such that they penetrate the rotor yoke, and a pair of end surface members formed of a non-magnetic material that closes the openings of both ends of the slots in which the permanent magnets have been inserted, wherein the two end surface members are secured to the rotor yoke by the two end rings when the secondary conductors and the end rings are formed.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet does not pass through the rotating shaft.
  • a stator equipped with a stator winding
  • a rotor which is secured to a rotating shaft and which rotates in the stator
  • a secondary conductor provided around the rotor yoke constituting the rotor
  • a permanent magnet embedded in the rotor yoke wherein a magnetic field produced by the permanent magnet does not pass through the rotating shaft.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet bypasses the rotating shaft.
  • a stator equipped with a stator winding
  • a rotor which is secured to a rotating shaft and which rotates in the stator
  • a secondary conductor provided around the rotor yoke constituting the rotor
  • a permanent magnet embedded in the rotor yoke wherein a magnetic field produced by the permanent magnet bypasses the rotating shaft.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor which is secured to a rotating shaft and which rotates in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein a magnetic field produced by the permanent magnet passes through only the rotor yoke, excluding the rotating shaft.
  • a stator equipped with a stator winding
  • a rotor which is secured to a rotating shaft and which rotates in the stator
  • a secondary conductor provided around the rotor yoke constituting the rotor
  • a permanent magnet embedded in the rotor yoke wherein a magnetic field produced by the permanent magnet passes through only the rotor yoke, excluding the rotating shaft.
  • a void is formed in the rotor yoke between the permanent magnet and the rotating shaft, so that the passage of the magnetic field produced by the permanent magnet can be reduced.
  • This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor caused by the friction.
  • a pair of the permanent magnets is disposed, sandwiching the rotating shaft therebetween, and permanent magnets for attracting the magnetic field produced by the paired permanent magnets are disposed at both ends of a line that passes the paired permanent magnets and the rotating shaft. It is therefore possible to prevent the magnetic field produced by the paired permanent magnets from passing through the rotating shaft. Thus, it is possible to prevent the rotating shaft from being magnetized. This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor caused by the friction.
  • the permanent magnets are provided at both ends of a line that connects two magnetic poles, and the permanent magnets are radially disposed substantially about the rotating shaft.
  • the magnetic field produced by the permanent magnets can be spaced away from the rotating shaft.
  • This arrangement makes it possible to prevent iron powder or the like from adhering to the rotating shaft and to protect the rotating shaft and a bearing from being worn due to the friction attributable to the magnetic force of the permanent magnet. This permits secure prevention of damage to the motor due to the friction.
  • the synchronous induction motor includes a stator equipped with a stator winding, a rotor rotating in the stator, a secondary conductor provided around the rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke, wherein the permanent magnet is magnetized by current passed through the stator winding.
  • a rotor in which a magnetic material for the permanent magnet that has not yet been magnetized has been inserted is installed in the stator, so that the rotor can be inserted into the stator without being magnetically attracted to its surrounding.
  • This arrangement makes it possible to prevent inconvenience of lower productivity of the synchronous induction motor, thus permitting improved assemblability of the synchronous induction motor. This allows a synchronous induction motor with high reliability to be provided.
  • the permanent magnet is made of a rare earth type magnet or a ferrite magnet, so that high magnet characteristic can be achieved.
  • the magnitude of the current passed through the stator winding can be reduced so as to control the temperature at the time of magnetization to a minimum.
  • the deformation of the rotor or the stator or the like that would be caused by high temperature can be minimized, making it possible to provide a synchronous induction motor with secured high quality.
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding, and the permanent magnet is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the permanent magnet is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a three-phase configuration that includes a three-phase winding.
  • the permanent magnet is magnetized by current passed through a single phase, two phases, or three phases of the stator windings. Therefore, it is possible to select the phase or phases through which current is to be passed according to the disposition of the magnet or the permissible current (against deformation or the like) of the windings.
  • the stator windings are coated with varnish or a sticking agent that is heated to fuse the windings.
  • varnish or a sticking agent that is heated to fuse the windings.
  • the synchronous induction motor in accordance with the present invention is installed in a compressor, allowing the production cost of the compressor to be considerably reduced.
  • the compressor is used with an air conditioner or an electric refrigerator or the like. Hence, the production cost of the air conditioner or the electric refrigerator can be decreased.
  • the manufacturing method for a synchronous induction motor having a stator equipped with a stator winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, and a permanent magnet embedded in the rotor yoke includes a step for embedding a magnet constituent for the permanent magnet in the rotor yoke and a step for passing current through the stator winding to magnetize the magnet constituent.
  • the rotor can be inserted into the stator without being magnetically attracted to its surrounding, permitting dramatically improved assemblability of the synchronous induction motor.
  • This makes it possible to prevent an inconvenience of reduced productivity of the synchronous induction motor, which permits improved assemblability of the synchronous induction motor.
  • a highly reliable synchronous induction motor can be provided.
  • a rare earth type or ferrite material is used for the magnet constituent. Therefore, a high magnet characteristic can be achieved even if, for example, a magnetizing magnetic field is weak. This makes it possible to reduce the current passing through the stator winding so as to minimize a temperature rise that occurs at the time of magnetization. Thus, the deformation of the rotor or the stator or the like caused by high temperature can be minimized, ensuring high quality of the synchronous induction motor.
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding, and the magnet constituent is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a single-phase configuration and has a primary winding and an auxiliary winding, and the magnet constituent is magnetized by the current passed through either the primary winding or the auxiliary winding.
  • the stator winding is of a three-phase configuration that includes a three-phase winding.
  • the magnet constituent is magnetized by current passed through a single phase, two phases, or three phases of the stator windings. Therefore, it is possible to select the phase or phases through which current is to be passed according to the disposition of the magnet or the permissible current (against deformation or the like) of the windings.
  • the stator windings are coated with varnish or a sticking agent that is heated to fuse the windings.
  • varnish or a sticking agent that is heated to fuse the windings.
  • the drive unit for a synchronous induction motor includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a series circuit of a start-up capacitor and a PTC, which is connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding and the series circuit of the start-up capacitor and the PTC, which is connected in parallel to the operating capacitor.
  • This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • the drive unit for a synchronous induction motor that includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a PTC connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding and the PTC connected in parallel to the operating capacitor. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • the drive unit for a synchronous induction motor includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, an operating capacitor connected to the auxiliary winding, and a series circuit of a start-up capacitor and a start-up relay contact, which is connected in parallel to the operating capacitor.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding and the series circuit of the start-up capacitor and the start-up relay contact, which is connected in parallel to the operating capacitor. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • the drive unit for a synchronous induction motor includes a stator equipped with a stator winding formed of a primary winding and an auxiliary winding, a rotor rotating in the stator, a secondary conductor provided around a rotor yoke constituting the rotor, a permanent magnet embedded in the rotor yoke, and an operating capacitor connected to the auxiliary winding.
  • This arrangement permits larger running torque to be provided at starting up the synchronous induction motor equipped with the operating capacitor connected to the auxiliary winding. This enables the power consumed during normal operation to be reduced, making it possible to provide a drive unit capable of running the synchronous induction motor with extremely high efficiency. Hence, considerably higher efficiency can be achieved during the operation of the synchronous induction motor.
  • the hermetic electric compressor includes a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and a thermal protector for cutting off the supply of current to the electric unit in response to a predetermined temperature rise is provided in the hermetic vessel.
  • installing the thermal protector onto the stator winding makes it possible to cut off the supply of current to the electric unit if the temperature of the stator winding rises.
  • This arrangement makes it possible to prevent the permanent magnet embedded in the rotor yoke from being thermally demagnetized by a rise in temperature of the electric unit.
  • the supply of current to the stator winding can be cut off before the stator winding generates abnormal heat while the hermetic electric compressor is in operation.
  • This makes it possible to securely prevent damage to the stator winding and thermal demagnetization of the permanent magnet so as to ideally maintain the driving force of a synchronous induction motor, permitting significantly improved reliability of the electric unit.
  • the hermetic electric compressor has a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and a thermal protector for cutting off the supply of current to the electric unit in response to a predetermined temperature rise is provided on the outer surface of the hermetic vessel.
  • the thermal protector is constructed of a thermistor whose resistance value varies with temperature and a controller that controls the supply of current to the electric unit according to a change in the resistance value of the thermistor.
  • the controller controls the supply of current to the electric unit to reduce the number of revolutions of the electric unit or cut off the supply of current to the electric unit.
  • the temperature of the electric unit can be controlled without the need for interrupting the operation of the hermetic electric compressor, an inconvenience, such as inadequate cooling, attributable to an interrupted operation of the hermetic electric compressor can be securely avoided.
  • a temperature rise in the electric unit can be securely controlled by controlling the revolution of the electric unit, enabling the service life of the electric unit to be prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the thermal protector is constituted by a bimetal switch, so that the current supplied to the electric unit can be cut off also if the temperature of the hermetic electric compressor rises. This obviates the need for controllably adjusting the electric unit by using an expensive circuit device, making it possible to effect inexpensive and secure protection of the hermetic electric compressor from damage caused by a temperature rise.
  • the thermal protector is constituted by a thermostat that opens/closes a contact according to temperature, so that the current supplied to the electric unit can be cut off also if the temperature of the hermetic electric compressor rises. This obviates the need for controllably adjusting the electric unit by using an expensive circuit device, making it possible to effect inexpensive and secure protection of the hermetic electric compressor from damage caused by a temperature rise.
  • the hermetic electric compressor includes a compression unit and an electric unit for driving the compression unit in a hermetic vessel, wherein the electric unit is secured to the hermetic vessel and constituted by a stator equipped with a stator winding and a rotor rotating in the stator, the rotor has a secondary conductor provided around a rotor yoke and a permanent magnet embedded in the rotor yoke, and an overload protector for cutting off the supply of current to the electric unit at a predetermined overload current is provided. Therefore, it is possible to cut off the supply of current to the electric unit if the hermetic electric compressor is overloaded during operation, thereby allowing the electric unit to be protected from a temperature rise. Thus, damage to the electric unit can be prevented, enabling the service life of the electric unit to be considerably prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the overload protector is constituted by an overload switch, so that the current supplied to the electric unit can be cut off to prevent a temperature rise in the electric unit thereby to protect it if the hermetic electric compressor is overloaded during operation.
  • damage to the electric unit can be prevented, enabling the service life of the electric unit to be considerably prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the overload protector is constituted by a current transformer for detecting the current supplied to the electric unit and a controller for controlling the supply of current to the electric unit on the basis of an output of the current transformer, so that the current supplied to the electric unit can be cut off by the controller if the hermetic electric compressor is overloaded during operation.
  • This arrangement makes it possible to prevent a temperature rise in the electric unit so as to protect the electric unit. Hence, damage to the electric unit attributable to an overload current can be securely prevented.
  • the controller cuts off the supply of current to the electric unit after a predetermined time elapses since a temperature or current exceeded a predetermined value. It is therefore possible to protect, by the controller, the electric unit which would be damaged if continuously subjected to an excessive temperature rise or overcurrent caused by an overload operation or the like of the hermetic electric compressor. Thus, damage to the electric unit can be prevented, enabling the service life of the electric unit to be considerably prolonged, with resultant dramatically improved reliability of the hermetic electric compressor.
  • the controller restarts the supply of current to the electric unit after waiting for the elapse of a predetermined delay time since the supply of current to the electric unit was cut off.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Manufacture Of Motors, Generators (AREA)
US10/108,047 2001-03-30 2002-03-28 Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor Abandoned US20020140309A1 (en)

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US10/692,865 US20040084984A1 (en) 2001-03-30 2003-10-27 Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor
US10/901,153 US7102264B2 (en) 2001-03-30 2004-07-29 Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor

Applications Claiming Priority (14)

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JP2001099938 2001-03-30
JP2001-100198 2001-03-30
JP2001-99938 2001-03-30
JP2001-99883 2001-03-30
JP2001100033 2001-03-30
JP2001099883A JP2002300744A (ja) 2001-03-30 2001-03-30 誘導同期電動機
JP2001100263A JP2002300763A (ja) 2001-03-30 2001-03-30 誘導同期電動機の駆動装置
JP2001-100263 2001-03-30
JP2001100129A JP2002300762A (ja) 2001-03-30 2001-03-30 誘導同期電動機及びその製造方法
JP2001100198A JP2002295367A (ja) 2001-03-30 2001-03-30 密閉型電動圧縮機
JP2001-100033 2001-03-30
JP2001-100129 2001-03-30
JP2001-161521 2001-05-30
JP2001161521A JP3754324B2 (ja) 2001-03-30 2001-05-30 誘導同期電動機

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US10/692,865 Abandoned US20040084984A1 (en) 2001-03-30 2003-10-27 Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor
US10/901,153 Expired - Fee Related US7102264B2 (en) 2001-03-30 2004-07-29 Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor

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EP (4) EP1246348B1 (de)
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US20060140788A1 (en) * 2002-05-02 2006-06-29 Smith Otto J Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit, a starting capacitor and a resistive element
US20070159281A1 (en) * 2006-01-10 2007-07-12 Liang Li System and method for assembly of an electromagnetic machine
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US11435118B2 (en) 2017-12-18 2022-09-06 Daikin Industries, Ltd. Heat source unit and refrigeration cycle apparatus
US11441802B2 (en) 2017-12-18 2022-09-13 Daikin Industries, Ltd. Air conditioning apparatus
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US20040084984A1 (en) 2004-05-06
US7102264B2 (en) 2006-09-05
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EP1750347B1 (de) 2011-06-15
EP1246348B1 (de) 2011-05-04
EP1746706A2 (de) 2007-01-24
EP1746706A3 (de) 2007-07-25
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US20050253474A1 (en) 2005-11-17

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