US20120057999A1 - Motor-driven compressor - Google Patents

Motor-driven compressor Download PDF

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Publication number
US20120057999A1
US20120057999A1 US13/222,191 US201113222191A US2012057999A1 US 20120057999 A1 US20120057999 A1 US 20120057999A1 US 201113222191 A US201113222191 A US 201113222191A US 2012057999 A1 US2012057999 A1 US 2012057999A1
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US
United States
Prior art keywords
permanent magnet
motor
magnet
driven compressor
rotor
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
US13/222,191
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English (en)
Inventor
Hiroshi Fukasaku
Minoru Mera
Kensuke Ikai
Takayuki Kato
Takahiro Sugioka
Takahiro Hoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
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Toyota Industries Corp
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Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKASAKU, HIROSHI, HOSHIDA, TAKAHIRO, IKAI, KENSUKE, KATO, TAKAYUKI, MERA, MINORU, SUGIOKA, TAKAHIRO
Publication of US20120057999A1 publication Critical patent/US20120057999A1/en
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
    • 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
    • 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
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines

Definitions

  • the present invention relates to a motor-driven compressor for use in a refrigeration system.
  • Motor-driven compressor for use in a refrigeration system such as vehicle-mounted air conditioner has in the housing thereof an electric motor that drives the compression mechanism of the compressor.
  • the housing of the compressor forms a refrigerant circulation path through which refrigerant circulates and the electric motor has therein a permanent magnet such as ferrite magnet or rare-earth magnet.
  • a permanent magnet such as ferrite magnet or rare-earth magnet.
  • the permanent magnet is relatively deteriorative in the presence of water or acid.
  • the deterioration of the permanent magnet leads to the deterioration of the entire motor-driven compressor.
  • Japanese Patent Application Publication No. 2009-225636 proposes forming a protective film on the surface of the permanent magnet incorporated in the electric motor of the motor-driven compressor for improving the corrosion resistance of the permanent magnet.
  • the use of the protective film is effective in preventing the deterioration of the permanent magnet. However, if the protective film has any damage, the effect of protection by the film is reduced.
  • the damage of the protective film is attributed to the fact that the permanent magnet in the rotor is urged to repeat slight movement (or vibration) relative to the rotor body while the motor-driven compressor is in operation. In view of the fact that the permanent magnet is attracted firmly against the rotor body by the magnetic force, it is unlikely that the permanent magnet moves relative to the rotor body. However, it is considered that various factors such as external vibrations cause the slight movement of the permanent magnet relative to the rotor body while the motor-driven compressor is actually in operation.
  • the present invention is directed to a motor-driven compressor that prevents the permanent magnet incorporated in an electric motor from moving relative to the rotor body of the rotor thereby to maintain the soundness of the protective film formed on the surface of the permanent magnet and to reduce deterioration of the permanent magnet.
  • the motor-driven compressor includes a housing, a compression mechanism, a rotary shaft, an electric motor, a protective film and a fixing resin.
  • the housing has a suction port and a discharge port.
  • the compression mechanism is disposed in the housing and adapted to compress refrigerant drawn into the housing through the suction port and to discharge the compressed refrigerant out of the housing through the discharge port.
  • the rotary shaft is disposed in the housing.
  • the electric motor is disposed in the housing. The electric motor is adapted to rotate the rotary shaft thereby to drive the compression mechanism.
  • the electric motor has a rotor fixed on the rotary shaft and a stator supported by the housing.
  • the rotor has a permanent magnet and a magnet hole in which the permanent magnet is inserted.
  • the magnet hole extends in an axial direction of the rotor.
  • the protective film is formed on a surface of the permanent magnet for improving corrosion resistance of the permanent magnet.
  • the fixing resin is filled in at least part of a gap between the permanent magnet and a wall of the magnet hole for fixing the permanent magnet to the wall of the magnet hole.
  • FIG. 1 is a partially cross sectional view showing a motor-driven compressor according to a first example of the present invention
  • FIG. 2 is an exploded perspective view showing a rotor of the motor-driven compressor of FIG. 1 ;
  • FIG. 3 is an end view showing a rotor body of the rotor of FIG. 1 , wherein permanent magnets are yet to be inserted in the rotor body;
  • FIG. 4 is an end view showing the rotor body of FIG. 3 , wherein the permanent magnets have been inserted in the rotor body;
  • FIG. 5 is an illustration showing a method for filling expanded holes of the magnet holes in the rotor body of FIG. 4 with fixing resin;
  • FIG. 6 is an illustration showing one of the permanent magnets fixed by the fixing resin in the rotor body of FIG. 4 ;
  • FIG. 7 is a perspective view showing the assembled rotor of the motor-driven compressor of FIG. 1 ;
  • FIG. 8 is a schematic view showing a vehicle-mounted air conditioner according to the first example of the present invention.
  • FIG. 9 is a perspective view showing a rotor of a motor-driven compressor according to a second example of the present invention being coated with resin film by spraying.
  • the motor-driven compressor 1 includes a housing 10 , a compression mechanism 15 , a rotary shaft 21 and an electric motor 2 all disposed in the housing 10 .
  • the housing 10 has therein a suction port 11 and a discharge port 12 .
  • the compression mechanism 15 is adapted to compress refrigerant drawn into the housing 10 through the suction port 11 and to discharge the compressed refrigerant out of the housing 10 through the discharge port 12 .
  • the electric motor 2 rotates the rotary shaft 21 thereby to drive the compression mechanism 15 .
  • the compression mechanism 15 has a fixed scroll member 13 fixed in the housing 10 and a moving scroll member 14 disposed in facing relation to the fixed scroll member 13 .
  • the fixed scroll member 13 and the moving scroll member 14 have therebetween a plurality of compression chambers 150 whose volumes are variable for compressing refrigerant.
  • the moving scroll member 14 is connected to an eccentric pin 210 of the rotary shaft 21 via a bearing 216 and an eccentric bushing 215 so as to make an orbital motion in accordance with the rotation of the rotary shaft 21 thereby to vary the volumes of the compression chambers 150 .
  • the electric motor 2 has a rotor 22 and a stator 23 disposed surrounding the rotor 22 .
  • the rotor 22 has therethrough a central hole 229 in which the rotary shaft 21 is fixed.
  • the rotary shaft 21 projects at the opposite ends thereof from the rotor 22 and is rotatably supported at the opposite ends by bearings 41 and 42 in the housing 10 , respectively.
  • the stator 23 is supported by the housing 10 and provided with a coil 235 . When the coil 235 is energized, the rotor 22 having therein a plurality of permanent magnets 3 is rotated. In the present example, the rotor 22 has four permanent magnets 3 .
  • the rotor 22 is formed of a plurality of magnetic steel plates laminated together into a cylinder shape.
  • the rotor 22 has a rotor body 220 through which a plurality of magnet holes 225 are formed extending axially and a pair of end plates 25 disposed at the opposite ends in the axial direction of the rotor body 220 .
  • the paired end plates 25 close the magnet holes 225 .
  • Each permanent magnet 3 is inserted in the magnet hole 225 .
  • the permanent magnet 3 has on the surface thereof a protective film 35 that improves the corrosion resistance of the permanent magnet 3 .
  • the protective film 35 has a chemical adsorption film.
  • a known neodymium magnet (or rare-earth magnet) having neodymium (Nd), iron (Fe) and boron (B) as the major components is used as the permanent magnet 3 .
  • the chemical adsorption film is used in the present example. After the surface of the permanent magnet 3 is cleaned by removing foreign substance from the surface of the permanent magnet 3 , a film forming that forms the chemical adsorption film is performed.
  • the film forming is accomplished by bringing the permanent magnet 3 into contact with film forming solution that is alkaline aqueous solution whose pH is 8 to 10 and then drying. More specifically, the film forming solution is prepared so that the pH becomes about 8 by adding three weight percentages (wt %) of triethanolamine and one weight percentage (wt %) of polyoxyalkylene alkyl ether that serves as a surfactant to one liter of water.
  • the film forming solution is heated to about 60 degrees Celsius (° C.) and the permanent magnet 3 is immersed in the heated film forming solution for three minutes.
  • the permanent magnet 3 is removed from the alkaline aqueous solution and kept in an oven under an air atmosphere of about 100° C. for sixty minutes.
  • the permanent magnet 3 is removed from the oven and left as it is until its temperature reaches an ordinary temperature.
  • the chemical adsorption film containing an amino group is formed on the surface of the permanent magnet 3 .
  • the resulting chemical adsorption film has a molecular level thickness.
  • each permanent magnet 3 having the chemical adsorption film is inserted in the magnet hole 225 as described above.
  • at least part of the gap between the permanent magnet 3 and the wall of the magnet hole 225 is filled with fixing resin 6 .
  • each magnet hole 225 has a generally rectangular main hole 228 corresponding in shape to the contour of the permanent magnet 3 and a pair of expanded holes 227 each expanded outward from part of the short side of the rectangular main hole 228 .
  • Each expanded hole 227 extends axially through the rotor body 220 .
  • each expanded hole 227 is filled with the fixing resin 6 as shown in FIGS. 5 and 6 .
  • each permanent magnet 3 whose entire surface is coated with the protective film 35 is inserted into the magnet hole 225 of the rotor body 220 having the paired elongated holes 227 . Then, a syringe-like resin filling device 7 having a needle member 71 with an injection hole 710 at the distal end thereof is prepared, as shown in FIG. 5 .
  • the resin filling device 7 has a cylindrical member 72 whose interior communicates with that of the needle member 71 and a piston member 73 that pushes the fixing resin 6 out of the cylindrical member 72 .
  • Resin filling operation is performed by inserting the needle member 71 of the resin filling device 7 into the expanded holes 227 of the magnet hole 225 and then injecting a proper amount of the fixing resin 6 into the expanded holes 227 , as shown in FIG. 5 .
  • the fixing resin 6 is not filled in each expanded hole 227 throughout its axial length, but partially filled in the expanded hole 227 at locations spaced axially. In order that all the permanent magnets 3 are fixed at the opposite ends in the width direction thereof, the fixing resin 6 is filled in all the expanded holes 227 .
  • Epoxy-series resin is used as the fixing resin 6 . It is noted that although in the present example the fixing resin 6 is partially filled in the expanded hole 227 at locations spaced axially, the fixing resin 6 may be filled in the expanded hole 227 throughout the axial length.
  • rivets 44 are inserted through rivet holes 224 , 254 of the rotor body 220 and the end plates 25 , respectively, and one end of each rivet 44 (or the left end as seen in FIG. 2 ) is crimped thereby to fix the end plates 25 to the rotor body 220 .
  • the rotor 22 is completed.
  • the rotary shaft 21 is inserted through the central hole 229 of the rotor body 220 and the central holes 259 of the end plates 25 and fixed.
  • the motor-driven compressor 1 is used for a vehicle-mounted air conditioner 5 , as shown in FIG. 8 .
  • the air conditioner 5 includes a condenser 51 , a receiver 52 , an expansion valve 53 and an evaporator 54 .
  • the compressor 1 , the condenser 51 , the receiver 52 , the expansion valve 53 and the evaporator 54 are connected in this order in the refrigerant circulation path 55 of the air conditioner 5 .
  • the expansion valve 53 is adjusted to change its opening by a controller 57 in accordance with the refrigerant temperature measured by a temperature sensor 56 located downstream of the evaporator 54 .
  • the receiver 52 separates the refrigerant into vapor and liquid and transfers only the liquid refrigerant to the expansion valve 53 .
  • the receiver 52 removes water contained in the refrigerant by adsorption agent (not shown) provided in the receiver 52 .
  • the refrigerant circulation path 55 or the motor-driven compressor 1 , is filled sealingly with 2,3,3,3-tetrafluoro-1-propene (CF 3 —CF ⁇ CH 2 ) as a refrigerant and polyolester as a lubricating oil, respectively.
  • Resin duct that is a nonmetallic duct is used in the part of the duct forming the refrigerant circulation path 55 .
  • the permanent magnet 3 in the rotor 22 is urged to move relative to the rotor body 220 for any reason while the motor-driven compressor 1 is in operation, the permanent magnet 3 is prevented from moving by the fixing resin 6 present in each expanded hole 227 .
  • the protective film 35 on the surface of the permanent magnet 3 is prevented from being damaged, so that the lifetime of the sound protective film 35 is increased and the deterioration of the permanent magnet 3 is prevented, accordingly.
  • the rotor 22 of the first example is further improved. That is, in the present example, the entire outer surface of the rotor 22 is coated with film made of resin or resin film 27 as shown in FIG. 9 .
  • the resin film 27 is formed by coating 270 sprayed by spray units 275 . Fluorine-series resin is used as the resin film 27 .
  • the resin film 27 is formed so as to coat not only the rotor 22 but also part of the rotary shaft 21 and the visible boundaries between the rotary shaft 21 and the rotor 22 .
  • the rotor 22 includes the rotor body 220 having therethrough the magnet holes 225 , the permanent magnets 3 inserted in the magnet holes 225 , and the end plates 25 closing the openings of the magnet holes 225 . That is, the openings of the magnet holes 225 having therein the permanent magnets 3 are closed by the end plates 25 , so that the magnet holes 225 are tentatively closed.
  • water or acid permeates through minute opening present in the rotor body 220 or minute gap between the rotor body 220 and the end plates 25 , direct ingress of water or acid into the magnet holes 225 with refrigerant and lubricating oil is prevented.
  • the resin film 27 that coats the entire outer surface of the rotor 22 prevents water or acid from permeating through the above minute opening or gap with refrigerant and lubricating oil. Therefore, the ingress of water or acid into the magnet holes 225 is prevented and the deterioration of the permanent magnet 3 is further prevented, accordingly.
  • the protective film 35 that is maintained in a sound state prevents the deterioration of the permanent magnet 3 .
  • the permanent magnet 3 becomes brittle and is powdered by chemical reaction with water, acid, or hydrogen derived therefrom for any reason, the closed structure where the rotor body 220 and the end plates 25 are combined together and an additional closed structure where the resin film 27 coats the minute opening and the minute gap cooperate to prevent the magnet powder from being released from the rotor 22 .
  • the motor-driven compressor of the present example provides effective measures against the circumstance under which the permanent magnet 3 is deteriorative and the deterioration of the permanent magnet 3 , and also a measure against the permanent magnet 3 that has been deteriorated.
  • the second example provides the motor-driven compressor with a high reliability.
  • the magnet hole has a main hole corresponding in shape to the contour of the permanent magnet and an expanded hole expanded outward from part of the wall of the main hole. It is also preferred that the expanded hole is opened at least at one end thereof in the axial direction of the rotor and filled with the fixing resin.
  • the main hole of the magnet hole should be of a minimum required size, so that the filling of the fixing resin is concentrated in the expanded hole. Thus, the resin filling operation is facilitated while minimizing the deterioration of magnetic performance due to the formation of the expanded hole in the rotor for filling the fixing resin.
  • a syringe-like resin filling device having a needle member with an injection hole at the distal end thereof may be used.
  • the resin filling operation is accomplished by inserting the needle member into the expanded hole after inserting the permanent magnet into the magnet hole.
  • the gap between the magnet hole and the permanent magnet may be filled at any position with the fixing resin without forming the expanded hole.
  • the protective film formed on the surface of the permanent magnet may have a chemical adsorption film having at least one of hydroxy group and amino group.
  • the chemical adsorption film blocks the active spot from which the corrosion of the surface of the permanent magnet starts, thereby to prevent the development of the corrosion.
  • the chemical adsorption film has an effect to neutralize acid by allowing alkaline functional group, such as hydroxy group or amino group of the chemical adsorption film, to react with acid. That is, the chemical adsorption film offers anti-corrosion and neutralizing effects. Thus, even if acid is present in the refrigerant circulation path, the permanent magnet having the chemical adsorption film is not prone to corrode and has high durability.
  • the chemical adsorption film can be easily made by allowing the permanent magnet having a desired shape to be in contact with the alkaline aqueous solution which contains amines and/or hydroxys and whose pH is 8 to 10, and then drying the film forming solution on the permanent magnet. That is, the resistance of the permanent magnet against acid corrosion is improved by allowing the permanent magnet to be in contact with the film forming solution and drying the film forming solution on the permanent magnet.
  • the chemical adsorption film is formed by chemical adsorption of amino group, hydroxy group or chemical compound containing amino group and hydroxy group on the surface of the permanent magnet.
  • the amino group may be defined as monovalent functional group (—NH 2 , —NHR, —NRR′) wherein one or more hydrogen atoms are removed from ammonia, primary amine or secondary amine. This definition does not intend to restrict the material of the amino group but to provide the structure of the amino group.
  • the amino group includes monovalent functional group obtained from tertiary amine.
  • the component of the chemical adsorption film depends on amines and/or hydroxys contained in film forming solution used in the film forming.
  • the chemical adsorption film may have a composition of hydroxy group only, amino group only or both of hydroxy group and amino group.
  • the chemical adsorption film is formed of any one of the above functional groups or chemical compound having such functional group that is chemically adsorbed on a molecular level.
  • the chemical adsorption film is extremely thin.
  • the confirmation for the presence of the chemical adsorption film may be accomplished by performing method such as Raman spectroscopic analysis, infrared-ray spectroscopic analysis, or secondary ion mass spectrometry (SIMS) for confirming the presence of amino group or hydroxy group.
  • the protective film formed on the surface of the permanent magnet may have a film made of a metal.
  • the metal for the protective film includes aluminum, nickel and copper.
  • Known method such as plating, sputtering or evaporation may be used for forming a metal film.
  • the corrosion resistance of the permanent magnet is improved remarkably by using a film made of a metal as the protective film. Film made only of a metal may be used as the protective film.
  • the chemical adsorption film may be formed on the surface of the film made of a metal. In this case, the combined effects of the metal film and the chemical adsorption film synergistically enhance the corrosion resistance of the permanent magnet.
  • a film made of a magnetic metal such as nickel is preferably used as the film made of a metal.
  • the protective film formed on the surface of the permanent magnet may have a film made of a resin.
  • the resin for the film includes epoxy resin, acrylic resin and fluorine resin.
  • the resin film may be formed by various coating methods. Using a film made of a resin as the protective film, hydrophobic surface that is prone to repel water may be easily formed.
  • a film made only of a resin may be used as the protective film, the film made of a resin may be combined with the chemical adsorption film and/or the film made of a metal in a laminar form.
  • the chemical adsorption film may be formed on the surface of the resin film formed on the surface of the permanent magnet.
  • the resin film may be formed on the surface of the metal film formed on the surface of the permanent magnet.
  • the chemical adsorption film may be formed on the surface of such resin film.
  • the use of a plurality of different films combined offers synergetic effect to further enhance the corrosion resistance of the permanent magnet.
  • the permanent magnet may be a rare-earth magnet.
  • the rare-earth magnet is more suitable than the ferrite magnet for use as the permanent magnet of the motor-driven compressor.
  • the rare-earth magnet is more prone to corrode than the ferrite magnet. Therefore, the use of the motor-driven compressor having the protective film on the surface of the permanent magnet for improving the corrosion resistance of the permanent magnet and having the gap between the permanent magnet and a wall of the magnet hole filled with a fixing resin for fixing the permanent magnet to the wall of the magnet hole, is particularly effective for this case.
  • the motor-driven compressor is preferably used for a vehicle-mounted air conditioner having a refrigerant circulation path in which a nonmetallic duct is connected.
  • the vehicle-mounted air conditioner includes a condenser, an expansion valve and an evaporator as well as the compressor that are connected by the refrigerant circulation path.
  • the refrigerant circulation path is sealingly filled with refrigerant and lubricating oil.
  • Nonmetallic duct such as resin duct may be used in part of the duct forming the refrigerant circulation path to impart the flexibility to the duct and to enhance the vibration-damping property.
  • resin is used herein in a broad sense, including natural resin, synthetic resin, natural rubber and synthetic rubber.
  • the nonmetallic duct such as resin duct is more prone to permit water permeation. If the nonmetallic duct is used for a long period of time in hot and humid conditions, water in the air may enter the refrigerant circulation path via the nonmetallic duct such as resin duct. Due to the ingress of water into the refrigerant circulation path, refrigerant and/or lubricating oil may change their properties thereby to produce acid. Therefore, the use of the motor-driven compressor having the protective film on the surface of the permanent magnet for improving the corrosion resistance of the permanent magnet and having the gap between the permanent magnet and a wall of the magnet hole filled with a fixing resin for fixing the permanent magnet to the wall of the magnet hole, is particularly effective for the vehicle-mounted air conditioner.
  • a refrigerant having less impact on the ozone layer than the refrigerant that has been referred to generally as chlorofluorocarbon has been used preferentially as the refrigerant for the refrigeration system.
  • Such refrigerant is referred to as HFO1234yf type refrigerant.
  • the HFO1234yf type refrigerant is relatively prone to dissolve in the presence of water because it contains the double bond. If water is mixed with refrigerant in the refrigerant circulation path for any reason during the manufacturing process of the compressor or during the market use, the refrigerant may dissolve thereby to produce hydrofluoric acid (HF). Acid such as hydrofluoric acid causes the permanent magnet to corrode relatively early. Therefore, the use of the motor-driven compressor having the protective film on the surface of the permanent magnet for improving the corrosion resistance of the permanent magnet and having the gap between the permanent magnet and a wall of the magnet hole filled with a fixing resin for fixing the permanent magnet to the wall of the magnet hole, is particularly effective for the refrigeration system using the HFO1234yf type refrigerant.
  • HF hydrofluoric acid
  • the motor-driven compressor is effective when the housing has therein lubricating oil containing at least one of polyolester (POE), polyvinyl ether (PVE) and polyalkylene glycol (PAG).
  • POE polyolester
  • PVE polyvinyl ether
  • PAG polyalkylene glycol
  • polyolester hydrolyzes in the presence of water thereby to produce organic carboxylic acid.
  • organic carboxylic acid may cause the permanent magnet to corrode.
  • the use of the motor-driven compressor having the protective film on the surface of the permanent magnet for improving the corrosion resistance of the permanent magnet and having the gap between the permanent magnet and a wall of the magnet hole filled with a fixing resin for fixing the permanent magnet to the wall of the magnet hole, is particularly effective for this case.
  • the rotor has a rotor body and a pair of end plates, that the magnet hole of the rotor extends through the rotor body in an axial direction of the rotor body, and that the paired end plates are disposed at opposite ends in the axial direction of the rotor body for closing the magnet hole.
  • the paired end plates close the magnet hole thereby reducing the chance of the permanent magnet contacting with the refrigerant containing water causing the deterioration of the permanent magnet, which reduces the deterioration of the permanent magnet.
  • the rotor body is formed of a plurality of magnetic steel plates laminated together, on the other hand, it is difficult to completely prevent the refrigerant from entering the magnet hole via slight gap between the laminated magnetic steel plates.
  • it is preferred that an entire outer surface of the rotor is coated with a resin film. The resin film prevents the ingress of water or acid into the magnet hole.
  • resin as in the resin film is used herein in a broad sense, including natural resin, synthetic resin, natural rubber and synthetic rubber.
  • the resin forming the film includes resin or rubber of, for example, polyethylene series, epoxy series, fluorine series, acrylic series, polyamide series, polyamide-imide series, silicone series, polyether ether ketone (PEEK) series, polyetherimide series, phenolic series, melamine series and urethane series.
  • PEEK polyether ether ketone
  • fluorine series resin is suitable for use because of its high flexibility.
  • the electric motors may be of either of a first type wherein the rotor rotating with the rotary shaft is disposed radially inward of a cylindrical stator or a second type wherein a cylindrical rotor is disposed radially outward of the stator.
  • the permanent magnet is formed of a flat plate and a plurality of the permanent magnets is disposed so as to form a polygon in cross section perpendicular to the axial direction of the rotor.
  • the permanent magnet is formed of a curved plate whose cross section is arched and a plurality of the permanent magnets is disposed so as to form a circle in cross section perpendicular to the axial direction of the rotor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US13/222,191 2010-09-06 2011-08-31 Motor-driven compressor Abandoned US20120057999A1 (en)

Applications Claiming Priority (2)

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JP2010-199283 2010-09-06
JP2010199283A JP2012057500A (ja) 2010-09-06 2010-09-06 電動圧縮機

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DE (1) DE102011112211A1 (ja)

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US20140239764A1 (en) * 2013-02-27 2014-08-28 Regal Beloit America, Inc. Laminated rotor with improved magnet adhesion and method of fabricating
US9188115B2 (en) 2011-09-28 2015-11-17 Kabushiki Kaisha Toyota Jidoshokki Electric motor for a motor-driven compressor and said motor-driven compressor
US20180248453A1 (en) * 2015-09-02 2018-08-30 Hitachi Automotive Systems, Ltd. Rotor, Rotating Electric Machine Including Said Rotor, and Method of Manufacturing Said Rotor
CN111082604A (zh) * 2014-01-29 2020-04-28 Lg 伊诺特有限公司 传感器模块和包括该传感器模块的马达

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Publication number Priority date Publication date Assignee Title
JP6761762B2 (ja) * 2017-01-27 2020-09-30 株式会社三井ハイテック 回転子積層鉄心及びその製造方法
JP7088229B2 (ja) * 2020-03-31 2022-06-21 株式会社富士通ゼネラル 圧縮機
DE102022124821A1 (de) 2022-09-27 2024-03-28 Schaeffler Technologies AG & Co. KG Rotor und Verfahren zur Herstellung eines Rotors

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US20020110463A1 (en) * 2001-02-14 2002-08-15 Kenzo Matsumoto Horizontal closed type compressor for vehicle use and cooling system of electric compressor for vehicle use
US7156928B2 (en) * 2001-11-20 2007-01-02 Shin-Etsu Chemical Co., Ltd. Corrosion-resistant rare earth element magnet
US20080113602A1 (en) * 2006-11-09 2008-05-15 Norman Golm Microbial resistant vehicle air conditioning ductwork
US7854056B2 (en) * 2005-09-01 2010-12-21 Toyota Jidosha Kabushiki Kaisha Production method of a rotor

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