JP3754324B2 - Induction synchronous motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention includes a plurality of secondary conductors provided at the periphery of the rotor yoke portion, an end ring die-cast integrally with the secondary conductor located at the periphery of both end surfaces of the rotor yoke portion, and rotation The present invention relates to an induction synchronous motor including a permanent magnet embedded in a child yoke part.
[0002]
[Prior art]
  Conventionally, for example, in an air conditioner (air conditioner) or a refrigerator (electric refrigerator), a hermetic electric compressor constituting a refrigeration cycle of the cooling device is mounted. As an electric element for driving the compressor, an induction motor, a DC brushless motor or an induction synchronous motor driven by a single-phase or three-phase commercial power source has been used.
[0003]
  The rotor of the induction synchronous motor is composed of a stator having a stator winding and a rotor that rotates within the stator. A plurality of secondary conductors located in the periphery of the rotor yoke part constituting the rotor are die-cast, and end rings integrally formed with the secondary conductor are provided in the periphery of both end faces of the rotor yoke part. Is die-cast. Further, a slot is formed through the rotor yoke, a permanent magnet is inserted into the slot, and both end openings of the slot are fixed by end face members.
[0004]
[Problems to be solved by the invention]
  However, the permanent magnet provided in the rotor is fixed by a fixing member after being inserted into a slot provided in the rotor yoke. Moreover, in order to make the rotation balance of a rotor favorable, the balancer is attached to the end ring vicinity located in the peripheral part of the end surface of a rotor yoke part. In this case, the end face member for fixing the permanent magnet in the slot after die casting of the end ring and the balancer are separately attached. For this reason, there has been a problem that the assembly workability of the induction synchronous electric motor is remarkably deteriorated.
[0005]
  Further, considering the provision of a slot space for fixing the permanent magnet to the rotor, the end ring must be made small. For this reason, the cross-sectional area of the end ring inevitably decreases. As a result, the amount of heat generated by the rotor during operation increases, resulting in a decrease in operating performance due to a decrease in the magnetic force of the magnet, and when the rare earth magnet is used as the permanent magnet, there is a problem that the magnet is extremely demagnetized.
[0006]
  The present invention has been made to solve the problems of the related art, and provides an induction synchronous motor that improves the assembly workability of the rotor of the induction synchronous motor and improves the driving performance of the motor. The purpose is to do.
[0007]
[Means for Solving the Problems]
  That is, the induction synchronous motor according to the present invention includes a stator having a stator winding and a rotor that rotates in the stator, and is positioned in the periphery of the rotor yoke portion that constitutes the rotor. A plurality of die-cast secondary conductors, an end ring die-cast integrally with the secondary conductor located at the periphery of both end faces of the rotor yoke portion, and the rotor yoke portion. A permanent magnet inserted into a slot formed so as to penetrate, and a pair of end surface members made of a non-magnetic material that respectively close both end openings of the slot;A non-magnetic material made of copper or brass that easily conducts current is placed in contact with the inside of both end rings, and the both end surface members are pressed and fixed to the rotor yoke portion by the non-magnetic material. It is.
[0008]
  Furthermore, the induction synchronous motor according to claim 2 is:In addition to claim 1, the compressor is mounted on a compressor.
[0009]
  Furthermore, the induction synchronous motor according to claim 3 is:In addition to claim 2, the compressor is used for an air conditioner or an electric refrigerator.
[0010]
  According to the present invention, an induction synchronous motor includes a stator having a stator winding and a rotor that rotates within the stator, and is provided at a peripheral portion of a rotor yoke that constitutes the rotor. A plurality of secondary conductors which are located and die-cast, an end ring which is located in the periphery of both end faces of the rotor yoke part and die-cast integrally with the secondary conductor, and the rotor yoke part A permanent magnet inserted into a slot formed in the through hole, and a pair of end face members made of a non-magnetic material that respectively closes both end openings of the slot,A non-magnetic material made of copper or brass that is easy to pass current is placed in contact with the inside of both end rings.Since the both end surface members are pressed and fixed to the rotor yoke portion by the nonmagnetic material, the cross-sectional area of the end ring can be increased by the pressing and fixing of the nonmagnetic material. As a result, the loss of the rotor can be reduced by the increase in the cross-sectional area of the end ring. As a result, the amount of heat generated by the rotor can be reduced, and the operation performance of the induction synchronous motor can be greatly improved.
[0011]
  According to the invention of claim 2, in addition to claim 1, the induction synchronous motor isSince it is installed in the compressor, the production cost of the compressor can be greatly reduced.
[0012]
  According to the invention of claim 3, in addition to claim 2, the induction synchronous motor includes:Since the compressor is used for an air conditioner or an electric refrigerator, the production cost of the air conditioner or the electric refrigerator can be greatly reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a vertical side view of a hermetic electric compressor C to which an induction synchronous motor 2 of the present invention is applied. In the figure, reference numeral 1 denotes an airtight container, in which an induction synchronous motor 2 is housed on the upper side, and a compressor 3 that is rotationally driven by the induction synchronous motor 2 is housed on the lower side. The sealed container 1 is sealed by high frequency welding or the like after accommodating the induction synchronous motor 2 and the compressor 3 in a previously divided two. Examples of the hermetic electric compressor C include a rotary, reciprocating, and scroll compressor.
[0014]
  The induction synchronous motor 2 includes a single-phase two-pole and a stator 4 fixed to the inner wall of the hermetic container 1, and a rotation that is rotatably supported around the rotation shaft 6 inside the stator 4. It is comprised from the child 5. The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.
[0015]
  The compressor 3 includes a first rotary cylinder 9 and a second rotary cylinder 10 partitioned by an intermediate partition plate 8. Eccentric portions 11 and 12 that are rotationally driven by the rotary shaft 6 are attached to the cylinders 9 and 10, and the eccentric portions 11 and 12 are 180 degrees out of phase with each other.
[0016]
  Reference numerals 13 and 14 denote a first roller and a second roller that rotate in the cylinders 9 and 10 respectively, and rotate in the cylinders by the rotation of the eccentric portions 11 and 12, respectively. Reference numerals 15 and 16 denote a first frame body and a second frame body, respectively. The first frame body 15 forms a compression space in which the cylinder 9 is closed between the first partition body 8 and the second frame body. 16 also forms a closed compression space of the cylinder 10 between the intermediate partition plate 8. The first frame body 15 and the second frame body 16 include bearing portions 17 and 18 that rotatably support the lower portion of the rotation shaft 6, respectively.
[0017]
  Reference numerals 19 and 20 denote discharge mufflers, which are attached so as to cover the first frame body 15 and the second frame body 16, respectively. The cylinder 9 and the discharge muffler 19 communicate with each other through a discharge hole (not shown) provided in the first frame 15, and the cylinder 10 and the discharge muffler 20 are also provided with a discharge (not shown) provided in the second frame 16. It communicates with a hole. Reference numeral 21 denotes a bypass pipe provided outside the sealed container 1 and communicates with the inside of the discharge muffler 20.
[0018]
  Reference numeral 22 denotes a discharge pipe provided on the sealed container 1, and 23 and 24 denote suction pipes connected to the cylinders 9 and 10, respectively. Reference numeral 25 denotes a hermetic terminal for supplying electric power from the outside of the hermetic container 1 to the stator winding 7 of the stator 4 (the lead wire connecting the hermetic terminal 25 and the stator winding 7 is not shown). )
[0019]
  Reference numeral 26 denotes a rotor core. Although not shown, a plurality of rotor iron plates each having a thickness of 0.3 mm to 0.7 mm punched out into a predetermined shape are stacked, and crimped together to be stacked integrally. (It may be integrated by welding instead of caulking). Reference numerals 66 and 67 denote end surface members attached to the upper and lower ends of the rotor core 26. The end face members 66 and 67 are made of a flat plate material made of a nonmagnetic material such as stainless steel, aluminum, copper, or brass. In addition, when a magnetic body is used for the end surface members 66 and 67, the end surface members 66 and 67 become a magnetic path, the magnet of the rotor 5 causes a magnetic short circuit, and the operation performance of the induction synchronous motor 2 is deteriorated.
[0020]
  2 is a plan view of the hermetic electric compressor C in which the hermetic container 1 is divided 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, and FIG. 5 is a side view of FIG. A stator winding 7 is wound around the stator 4, and a lead wire 50 connected to the stator winding 7 and a coil end of the stator winding 7 are connected together by a polyester thread 70. At the same time, the lead wire 50 is connected to the sealed terminal 25.
[0021]
  The rotor 5 includes a rotor yoke portion 5A, a saddle-shaped secondary conductor 5B that is located in the periphery of the rotor yoke portion 5A and die-cast, and ends of both ends of the rotor yoke portion 5A. The other end ring 69, which is located at the periphery and protrudes by a predetermined size in a ring shape and is die-cast integrally with the saddle-shaped secondary conductor 5B, and the permanent magnet 31 embedded in the rotor yoke portion 5A, It is composed of The permanent magnet 31 is magnetized after a permanent magnet material is inserted into a slot 44 described later. For magnetization, the permanent magnets 31 (31SA, 31SB) embedded on one side of the rotating shaft 6 (for example, the right side in the figure) have the same S pole, and the permanent magnets 31 (embedded on the other side (left side in the figure)) ( 31NA and 31NB) are the same N poles.
[0022]
  Also, a plurality of saddle-shaped secondary conductors 5B are provided in the periphery of the rotor yoke portion 5A, and aluminum die-cast in a cylindrical hole (not shown) formed in a saddle shape over the extending direction of the rotary shaft 6. Is injection molded. The saddle-shaped secondary conductor 5B is formed in a so-called skewed structure that is inclined in a spiral shape with a predetermined angle in the circumferential direction of the rotary shaft 6 from one end to the other end (FIG. 5).
[0023]
  The rotor yoke portion 5A is formed with a plurality of slots 44 that are vertically formed and open at both ends (four in this embodiment). The openings at both ends of the slot 44 are formed by a pair of the end surface members 66 and 67. Each is blocked (FIGS. 6 and 7). One end surface member 67 is fixed to the rotor yoke portion 5 </ b> A by one end ring 69 during die casting of the saddle-shaped secondary conductor 5 </ b> B and the end rings 68 and 69. Further, the other end face member 66 is fixed to the rotor yoke portion 5A by a plurality of rivets 66 as fixing tools.
[0024]
  In this case, after the permanent magnet 31 is inserted from the opening of the slot 44, the opening is closed by the other end surface member 66, and this end surface member 66 is provided on the rotor yoke portion 5A by rivets 66A. The permanent magnets 31 are fixed in the slots 44 by caulking and fixing to the engagement holes 5C. The permanent magnet 31 is composed of a strong magnetic force, for example, a praseodymium permanent magnet or a rare earth permanent magnet material such as a neodymium permanent magnet whose surface is plated with nickel. The permanent magnets 31 and 31 are provided to face the rotating shaft 6, and the opposing permanent magnets 31 and 31 are embedded with different magnetic poles.
[0025]
  Permanent magnets 31SA and 31SB embedded on one side (for example, the right side and upper side in the figure) of the rotary shaft 6 are the same S poles, and permanent magnets 31NA and 31NB embedded on the other side (left side and lower side in the figure), respectively. Have the same north pole. That is, the permanent magnets 31SA and 31SB and the permanent magnets 31NA and 31NB are arranged in a substantially square shape with the rotation shaft 6 as the center, and two different S-poles and N-poles are provided toward the outer side in the circumferential direction of the rotation shaft 6. It is embedded in a pole configuration, and is configured such that a rotational force can be applied to the rotor 5 by a magnetic force of a main winding 7A and an auxiliary winding 7B described later. The arrangement of the permanent magnets 31 in FIGS. 6 and 7 is different from the arrangement of the permanent magnets 31 in FIGS. 2, 3 and 4, but the arrangement of the permanent magnets 31 in FIGS. 6 and 7 is different. The arrangement may be as shown in FIGS. 2, 3, and 4. In this case, it is necessary to change the caulking position of the rivet 66A. Further, the permanent magnets 31 shown in FIGS. 2, 3, and 4 may be arranged as shown in FIGS.
[0026]
  Such an air conditioner using the hermetic electric compressor C equipped with the induction synchronous motor 2 or a refrigerant circuit such as an electric refrigerator (FIG. 8) is used to cool the indoor air conditioner or the refrigerator. Is done. That is, when the compressor 3 of the hermetic electric compressor C is driven, the refrigerant sealed in the refrigerant circuit is sucked from the suction pipe 23 and is supplied to the first rotary cylinder 9 and the second rotary cylinder 10. Compressed and discharged from the discharge pipe 22 to the pipe 27. The compressed gas refrigerant discharged to the pipe 27 flows into the condenser 28 (condenser), where it dissipates heat and is condensed to become liquid refrigerant and flows into the liquid receiver (receiver tank) 29.
[0027]
  After flowing into the liquid receiver 29 and temporarily stored there, the liquid refrigerant is throttled by the temperature automatic expansion valve 37 from the pipe 29A on the outlet side of the liquid receiver 29 via the dryer 30, the moisture indicator 35, and the electromagnetic valve 36. It flows into the evaporator 38 (evaporator) and vaporizes there. At that time, by absorbing heat from the surroundings, the cooling effect is exerted and most of the liquid is liquefied, and then the refrigerant flows into the accumulator 39 from the piping 38A on the outlet side of the evaporator 38, where it is gas-liquid separated and then checked. The refrigeration cycle that is sucked into the compressor 3 again through the valve 40 is repeated.
[0028]
  The liquid refrigerant exiting the liquid receiver 29 is branched from the pipe 29A and connected to the pipe 38A between the evaporator 38 and the accumulator 39 via the capillary tube 41, the high / low pressure switch 42, and the capillary tube 43. The high / low pressure switch 42 detects the pressures of the pipes 29A and 38A via the capillary tubes 41 and 43, and the pressures of both pipes 29A and 38A become a predetermined pressure difference or more and are sucked into the sealed electric compressor C. When the refrigerant to be discharged is insufficient, the liquid refrigerant from the liquid receiver 29 flows into the compressor 3 to be protected. The automatic temperature expansion valve 37 automatically adjusts the opening degree according to the temperature detected by the temperature sensing cylinder 34 provided on the outlet side of the evaporator 38.
[0029]
  On the other hand, FIG. 9 shows an electric circuit diagram of the induction synchronous motor 2. In FIG. 9, an induction synchronous motor 2 supplied with power from a single-phase AC commercial power supply AC includes a main winding 7A and an auxiliary winding 7B, and the main winding connected to one of the single-phase AC commercial power supply AC. 7A is connected to the other of the single-phase alternating current commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power source AC is connected in series to the other side of the single-phase AC commercial power source AC via the PTC 46 and the starting capacitor 48. An operating capacitor 47 is connected in parallel.
[0030]
  The PTC 46 is a semiconductor element whose resistance value increases in proportion to the temperature. When the induction synchronous motor 2 is started, the resistance value is low, and when the current flows and generates heat, the resistance value increases. Reference numeral 49 denotes a power switch, which supplies power to the stator winding 7 from a current-sensitive line current detector that detects line current and the single-phase AC commercial power supply AC, and also supplies power to the stator winding 7. It consists of an overload relay that doubles as a protective switch that cuts off the supply. Further, the operating capacitor 47 is set to a capacity suitable for steady operation, and the capacitors 47 and 48 are set to a capacity suitable for starting in a state where the operating capacitor 47 and the starting capacitor 48 are connected in parallel.
[0031]
  Next, the operation of the induction synchronous motor 2 will be described. When the power switch 49 is closed, a current flows from the single-phase AC commercial power AC to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is initially started, the temperature of the PTC 46 is low and the resistance value is low, so that a large current flows through the PTC 46 and a large current also flows through the auxiliary winding 7B, and the auxiliary winding 7B is connected in parallel. The induction synchronous motor 2 starts the start operation by obtaining the start torque by the current phase difference between the operation capacitor 47, the start capacitor 48 and the main winding 7A. Since the PTC 46 self-heats due to this energization, the resistance value increases, and almost no current flows through the PTC 46 itself. As a result, the starting capacitor 48 is disconnected, and the induction synchronous motor 2 continues the steady operation by the current phase difference between the main winding 7A and the auxiliary winding 7B by the operating capacitor 47. By the operation of the hermetic electric compressor C, indoor air conditioning is performed by air conditioning and the inside of the refrigerator is cooled.
[0032]
  In this way, one end face member 67 is fixed to the rotor yoke portion 5A by the one end ring 69 when the secondary conductor 5B and both end rings 68 and 69 are molded. Further, since the other end surface member 66 is fixed to the rotor yoke portion 5A by a rivet 66A, the one end surface member 67 is simultaneously formed with the rotor yoke portion when the secondary conductor 5B and the end rings 68 and 69 are die-cast. It becomes possible to fix to 5A. Thus, after the permanent magnet 31 is inserted into the slot 44, the permanent magnet 31 can be fixed to the rotor 5 only by fixing the other end face member 66 to the rotor yoke portion 5A with the rivet 66A. .
[0033]
  Next, another rotor 5 is shown in FIGS. In this case, the nonmagnetic materials 55 and 56 are disposed in contact with the insides of both end rings 68 and 69 integrally formed with the saddle-shaped secondary conductor 5B constituting the rotor 5, and the nonmagnetic material 55 , 56 are made of copper, brass or the like which allows easy passage of current. The nonmagnetic materials 55 and 56 are attached to both ends of the rotor yoke portion 5A in a state of being closely attached to the flat end member 66 that covers both ends of the permanent magnet 31 embedded in the rotor yoke portion 5A. It has a thickness that protrudes from the end rings 68 and 69 that are integrally die-cast.
[0034]
  Both ends of the nonmagnetic materials 55 and 56 are fixed by caulking with rivets 66B... Penetrating through the engaging holes 5C provided in the rotor yoke portion 5A. The rivets 66B... Are arranged in a substantially quadrangular shape around the rotating shaft 6 and are fixed at four locations by being positioned inside the corners where both ends of the permanent magnets 31SA and 31SB and permanent magnets 31NA and 31NB are in contact. Has been. Thus, the nonmagnetic materials 55 and 56 press and fix the end surface members 66 and 67 to the rotor yoke portion 5A.
[0035]
  12 and 13 show another rotor 5. In this case, as in FIGS. 10 and 11, the nonmagnetic materials 55 and 56 are disposed in contact with the insides of both end rings 68 and 69 die-cast integrally with the saddle-shaped secondary conductor 5B constituting the rotor 5. The non-magnetic materials 55 and 56 are made of copper or brass that can easily pass an electric current. The nonmagnetic materials 55 and 56 protrude from the both end surfaces of the rotor yoke portion 5A in a state of being closely attached to the flat end member 66 that covers both ends of the permanent magnet 31 embedded in the rotor yoke portion 5A. Thus, it has a thickness that does not protrude from the end rings 68 and 69 integrally die-cast.
[0036]
  Engagement pins 55A and 55A having a predetermined diameter and a predetermined length are projected and molded on one surface side of the nonmagnetic material 55, and a predetermined diameter and a predetermined length are also formed on the one surface side of the nonmagnetic material 56. The mating pins 56A and 56A are protrudingly molded. The nonmagnetic materials 55 and 56 are cast by a mold, and the engaging pins 55A, 55A, 56A, and 56A are integrally formed with the nonmagnetic materials 55 and 56, respectively. And the nonmagnetic materials 55 and 56 are thickly fixed to the engagement holes 5C provided in the rotor yoke portion 5A. Thus, the nonmagnetic materials 55 and 56 press and fix the end surface members 66 and 67 to the rotor yoke portion 5A.
[0037]
  In this manner, the nonmagnetic material 55 is disposed in contact with the inner sides of the end rings 68 and 69, and the both end surface members 66 and 67 are pressed and fixed to the rotor yoke portion 5A by the nonmagnetic material 55. It becomes possible to increase the cross-sectional area of the end rings 68 and 69 by the pressing and fixing of the nonmagnetic material 55. As a result, the secondary resistance decreases as the cross-sectional areas of the end rings 68 and 69 increase. Therefore, the temperature rise of the end rings 68 and 69 can be suppressed, the magnetic force of the magnet can be effectively used, and the operation performance of the induction synchronous motor 2 can be greatly improved.
[0038]
  On the other hand, the balancer 60 for making the rotation balance of the rotor 5 favorable is provided in the rotor yoke part 5A (FIGS. 14 and 15). The balancer 60 is molded in a predetermined shape by die casting or the like, and has a stepped shape between an end surface fixing portion 60A for fixing the end surface member 66 and a mounting portion 60B mounted on the end ring 68 from the end surface fixing portion 60A. In addition, the balancer 60 has a substantially semicircular shape of the rotor yoke portion 5A. The substantially equidistant positions are fixed by rivets 66C across the center of the semicircular balancer 60, and the balancer 60 is fixed to the rotor yoke portion 5A together with the end surface members 66 and 67 by the rivets 66C.
[0039]
  Thus, since the balancer 60 is fixed to the rotor yoke portion 5A together with the end surface members 66 and 67 by the rivets 66C, the workability of attaching the balancer 60 can be greatly improved. This eliminates the need to fix the permanent magnet 31 and the balancer 60 separately, so that the productivity of the induction synchronous motor 2 can be greatly improved.
[0040]
  FIG. 16 shows another balancer 61. The balancer 61 is made of a stainless steel plate, copper plate, brass plate or the like having a predetermined thickness, a plate-like balancer 61A made of a metal plate having an outer diameter substantially the same as the end face fixing portion 60A of the balancer 60 shown in FIG. And a plate-like balancer 61B made of a metal plate having substantially the same outer diameter, and a predetermined number of these plate-like balancers 61A and plate-like balancers 61B are stacked, and the rotor joints together with the end face members 66 and 67 by rivets 66C. A balancer 61 is configured by being fixed to the iron part 5A.
[0041]
  Thus, since the balancer 60 is fixed to the rotor yoke portion 5A together with the end surface members 66 and 67 by the rivet 66A, the workability of attaching the balancer 60 is improved, and the productivity can be greatly improved. become. Further, since a plurality of plate-like balancers 61A and 61B are laminated, it is possible to easily adjust the weight of the balancer 60, and for example, by using a low-cost metal plate for the balancer 60, The cost of the balancer 60 can be greatly reduced.
[0042]
  17 and 18 show another balancer 62. The balancer 62 is formed by integrally molding the one end face member 67 and the balancer 60 shown in FIG. 14, and is formed continuously with a weight portion 62A corresponding to the balancer 60 and the weight portion 62A. It is integrally formed by the end surface portion 62 </ b> B as a portion corresponding to the other end surface member 67. The balancer 62 is cast by casting die cast, copper or brass into a mold. The end surface portion 62 is fixed to the rotor yoke portion 5A together with the other end surface member 67 by the rivet 66B and the weight portion 62A together with the other end surface member 67.
[0043]
  Thus, since the balancer 62 formed by integrally molding the one end face member 67 and the balancer 60 is provided, the number of parts can be reduced. Thereby, the attachment work of the end surface member 67 can be simplified and productivity can be improved significantly.
[0044]
  In the embodiment, stainless steel plates are used for the end surface members 66 and 67 for holding the permanent magnet 31. However, if an aluminum plate that allows current to flow more easily is used for the end surface members 66 and 67, the secondary resistance can be lowered. , Will be able to greatly improve driving performance.
[0045]
  In the embodiment, the rotary compressor is adopted as an example of the hermetic electric compressor C. However, the present invention is not limited to this, and the present invention is also effective for a hermetic scroll compressor including a pair of scrolls meshing with each other.
[0046]
【The invention's effect】
  As described above in detail, according to the present invention, an induction synchronous motor includes a stator having a stator winding and a rotor that rotates in the stator, and a rotor yoke that constitutes the rotor. A plurality of secondary conductors die-cast molded at the peripheral part of the part, an end ring die-cast integrally with the secondary conductor located at the peripheral part of both end surfaces of the rotor yoke part, A permanent magnet inserted into a slot penetrating the rotor yoke portion, and a pair of end face members made of a non-magnetic material that respectively closes both ends of the slot;A non-magnetic material made of copper or brass that is easy to pass current is placed in contact with the inside of both end rings.Since the both end surface members are pressed and fixed to the rotor yoke portion by the nonmagnetic material, the cross-sectional area of the end ring can be increased by the pressing and fixing of the nonmagnetic material. As a result, the secondary resistance decreases as the cross-sectional area of the end ring increases. Therefore, the loss of the rotor can be reduced, the heat generation can be suppressed, and the operation performance of the induction synchronous motor can be greatly improved by effectively using the magnetic force of the magnet.
[0047]
  Furthermore, according to the invention of claim 2, the induction synchronous motor includes, in addition to claim 1,Since it is mounted on the compressor, the production cost of the compressor can be reduced.
[0048]
  Furthermore, according to the invention of claim 3, an induction synchronous motor is provided in addition to claim 2,Since the compressor is used in an air conditioner, an electric refrigerator, or the like, the production cost of the air conditioner or the electric refrigerator can be reduced.
[Brief description of the drawings]
FIG. 1 is an example of a longitudinal side view of a hermetic electric compressor to which an induction synchronous motor according to the present invention is applied.
FIG. 2 is a plan view of a hermetic electric compressor in which a hermetic container is divided into two parts.
FIG. 3 is a cross-sectional top view of the electric motor.
FIG. 4 is a cross-sectional top view in which a rotor is partially broken.
FIG. 5 is a side view of a rotor.
FIG. 6 is a top view of a rotor.
7 is a longitudinal side view of the rotor of FIG. 6. FIG.
FIG. 8 is a refrigerant circuit diagram of an air conditioner or an electric refrigerator using a sealed electric compressor equipped with the induction synchronous motor of the present invention.
FIG. 9 is an electric circuit diagram of the induction synchronous motor.
FIG. 10 is a top view of another rotor.
11 is a partially longitudinal side view of the rotor of FIG.
FIG. 12 is a top view of another rotor.
13 is a longitudinal side view of the rotor of FIG. 12. FIG.
FIG. 14 is a top view of a rotor showing a state in which an end face member provided inside the end ring is fixed by a balancer.
15 is a view showing a part of a longitudinal side view of the rotor of FIG. 12; FIG.
FIG. 16 is a view showing a part of a longitudinal side view of a rotor to which a balancer in which a plurality of plate-like balancers are stacked is attached.
FIG. 17 is a top view of a rotor in which an end face member and a balancer are integrally molded and attached.
18 is a view showing a part of a longitudinal side view of the rotor of FIG. 17; FIG.
[Explanation of symbols]
  1 Airtight container
  2 Induction synchronous motor
  3 Compressor
  4 Stator
  5 Rotor
  5A rotor yoke part
  5B Secondary conductor
  5C engagement hole
  7 Stator winding
  7A Main winding
  7B Auxiliary winding
  26 Rotor core
  28 Condenser
  29 Liquid receiver
  31 Permanent magnet
  31SA permanent magnet
  31SB permanent magnet
  31NA permanent magnet
  31NB permanent magnet
  38 Evaporator
  44 slots
  47 Operating capacitor
  48 starting capacitor
  49 Power switch
  55 Non-magnetic materials
  55A engagement pin
  56 Non-magnetic materials
  56A engagement pin
  60 Balancer
  60A End face fixing part
  60B placement section
  61A plate balancer
  61B plate balancer
  62 Balancer
  66 End face members
  67 End face member
  68 End Ring
  69 End Ring
  C hermetic electric compressor
  AC single-phase AC commercial power

Claims (3)

It consists of a stator with a stator winding and a rotor that rotates in the stator,
A plurality of secondary conductors die-cast in the periphery of the rotor yoke constituting the rotor, and integrated with the secondary conductor in the periphery of both end faces of the rotor yoke A die-cast end ring, a permanent magnet inserted into a slot penetrating the rotor yoke portion, and a pair of end face members made of a non-magnetic material that respectively closes the openings at both ends of the slot. A non-magnetic material made of copper or brass that allows easy passage of electric current in contact with the inner sides of the both end rings, and the non-magnetic material presses and fixes the both end surface members to the rotor yoke part. An induction synchronous motor characterized by that. The induction synchronous motor according to claim 1 , wherein the induction synchronous motor is mounted on a compressor . The induction synchronous motor according to claim 2, wherein the compressor is used in an air conditioner or an electric refrigerator .

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