WO2020225872A1 - Stator de moteur électrique, moteur électrique, compresseur hermétique et dispositif à cycle de réfrigération - Google Patents

Stator de moteur électrique, moteur électrique, compresseur hermétique et dispositif à cycle de réfrigération Download PDF

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Publication number
WO2020225872A1
WO2020225872A1 PCT/JP2019/018380 JP2019018380W WO2020225872A1 WO 2020225872 A1 WO2020225872 A1 WO 2020225872A1 JP 2019018380 W JP2019018380 W JP 2019018380W WO 2020225872 A1 WO2020225872 A1 WO 2020225872A1
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WIPO (PCT)
Prior art keywords
groove
winding
stator
electric motor
end insulator
Prior art date
Application number
PCT/JP2019/018380
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English (en)
Japanese (ja)
Inventor
諒 石田
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/018380 priority Critical patent/WO2020225872A1/fr
Priority to JP2021518248A priority patent/JP7170855B2/ja
Publication of WO2020225872A1 publication Critical patent/WO2020225872A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation

Definitions

  • the present invention relates to a stator of an electric motor having a through groove in the core back of the stator core, an electric motor, a closed compressor, and a refrigeration cycle device.
  • the electric motor part has a rotor and a stator.
  • the rotor is connected to the compression mechanism via a spindle.
  • the stator is fixed to a closed container by a method such as shrink fitting.
  • the compression mechanism unit compresses the refrigerant and supplies the compressed refrigerant to a refrigeration cycle device provided outside the closed container. During the supply process of the refrigerant compressed by the compression mechanism, the refrigerant may entrain the lubricating oil of the compression mechanism and pass through the space of the electric motor.
  • the stator windings are exposed to the high temperature gas refrigerant compressed by the compression mechanism.
  • the winding of the stator heats itself by the secondary current.
  • the winding of the stator becomes a high temperature state. Therefore, the winding of the stator is a target to be cooled from the viewpoint of the heat resistant temperature of the winding or the winding resistance.
  • the upper limit of the discharge temperature is 115 ° C
  • the upper limit of the heat resistant temperature of the winding is 130 ° C.
  • the discharge temperature of the gas refrigerant is usually controlled to be less than the upper limit of the heat resistant temperature of the winding.
  • One of the effective methods for cooling the stator winding is to increase the amount of refrigerant passing through the space of the electric motor portion to promote heat exchange between the stator winding and the refrigerant.
  • a technique for providing a refrigerant passage for an electric motor having a stator in which a conductor such as a copper wire is wound through an insulating paper in a slot of a stator core in which a plurality of electromagnetic steel sheets are laminated.
  • the refrigerant passage extends a through groove along the central axial direction in the core back, which is an annular core portion formed on the outer periphery of the stator core, in the vicinity of the winding of the stator.
  • Patent Document 1 when the technique of Patent Document 1 is applied to the stator of a closed compressor for a refrigerating air conditioner, the lubricating oil that has passed through the refrigerant passage together with the refrigerant is wound up in the upper space of the closed container. As a result, the lubricating oil is easily taken out of the compressor together with the refrigerant, the oil circulation rate in the refrigeration cycle device increases, and the reliability of the compressor decreases due to oil depletion in the closed compressor. is there.
  • the present invention is for solving the above problems, and while maintaining the function of cooling the windings of the stator, it is possible to suppress the taking out of the lubricating oil to the outside of the compressor, and the reliability of the compressor can be ensured. It is an object of the present invention to provide a stator of an electric motor, an electric motor, a closed compressor, and a refrigeration cycle device.
  • the stator of the electric motor according to the present invention has a stator core having a plurality of teeth on the circumference and a slot formed between the adjacent teeth, a winding wound around the teeth, and the winding.
  • An insulating film that insulates between the wire and the inner peripheral portion of the slot, and a lower end insulator that insulates between the winding and the lower end portion of the teeth in the distributed circumference of the plurality of teeth in the central axial direction.
  • an upper end insulator that insulates between the winding and the upper end of the teeth in the central axis direction, and the stator core comes into contact with the insulating film on the outer side in the circumferential direction of the slot.
  • the upper end insulator has a partition surface portion that blocks the upward penetration of the through groove, and has a first communication groove extending over both ends in the direction.
  • the electric motor according to the present invention includes the stator of the above electric motor.
  • the closed compressor according to the present invention includes the above-mentioned electric motor.
  • the refrigeration cycle device according to the present invention is provided with the above-mentioned sealed compressor.
  • the contact surface portion of the core back with the insulating film has through grooves extending in both vertical directions along the central axial direction.
  • the lower end insulator has a first communication groove that communicates with the through groove and extends over both ends in the vertical direction.
  • the upper end insulator has a partition surface portion that partitions the upward penetration of the through groove.
  • the refrigerant that has flowed into the through groove is blocked by the partition surface from the through groove in the upper end insulator, and the lubricating oil that has flowed into the through groove together with the refrigerant flows upward from the partition surface. Can be prevented. Therefore, while maintaining the function of cooling the windings of the stator, it is possible to prevent the lubricating oil from being taken out of the compressor, and the reliability of the compressor can be ensured.
  • FIG. 5 is a lower end view showing the stator core according to the first embodiment as viewed from below in which the compression mechanism portion is arranged.
  • FIG. 5 is a correlation diagram showing a winding and a through groove according to the first embodiment. It is a perspective view which shows the stator core of the state before mounting the winding and the insulating film which concerns on Embodiment 1.
  • FIG. 5 is a perspective view showing a stator core in a state before mounting the winding and the insulating film according to the second embodiment.
  • FIG. 5 is a correlation diagram showing an angle ⁇ formed by the through groove and the first communication groove according to the second embodiment. It is a correlation diagram which shows Wmin and W in the tee score which concerns on Embodiment 3. It is explanatory drawing which shows the stator core which concerns on Embodiment 4 in the vertical cross section of the line AA of FIG.
  • FIG. 1 is an explanatory view showing a sealed compressor 100 according to the first embodiment in a vertical cross section.
  • the illustrated U is upward and D is downward.
  • the closed type compressor 100 includes a closed container 1, a compression mechanism unit 2, and an electric motor 3.
  • the closed container 1 has an oil storage portion 1a that forms an outer shell of the closed compressor 100 and stores lubricating oil at the bottom thereof.
  • a compression mechanism portion 2 is arranged in the lower part of the closed container 1.
  • An electric motor 3 is arranged in the upper part of the closed container 1.
  • the closed container 1 is composed of a cylindrical central container 11 and an upper container 12 and a lower container 13 that are fitted in the upper and lower openings of the central container 11 in a closed state.
  • a suction pipe 15 having a suction muffler 14 is connected to the central container 11 in the middle.
  • the suction pipe 15 is a connection pipe that sends the inflowing low-temperature low-pressure gas refrigerant into the compression mechanism unit 2.
  • a discharge pipe 16 is connected to the upper container 12.
  • the discharge pipe 16 is a connecting pipe that allows the refrigerant in the closed container 1 compressed by the compression mechanism unit 2 to flow into the refrigerant pipe.
  • the refrigerant sucked from the suction pipe 15 having the suction muffler 14 is compressed to a high pressure by the compression mechanism unit 2 and discharged from the discharge pipe 16 to the outside of the compressor.
  • the compression mechanism portion 2 includes a rotating shaft 21, a main bearing 22, an auxiliary bearing 23, a rolling piston 24, a cylindrical cylinder 25, and a vane (not shown).
  • the rotating shaft 21 is fixed to the rotor 32 of the electric motor 3.
  • the rotating shaft 21 is held by a main bearing 22 and an auxiliary bearing 23.
  • the rolling piston 24 is fixed to the rotating shaft 21 and is eccentrically and rotatably housed in the cylindrical cylinder 25.
  • the inside of the cylindrical cylinder 25 is divided into compression chambers by vanes.
  • the vane moves the compression chamber following the movement of the rolling piston 24.
  • the refrigerant that has become high pressure in the compression chamber is sent from the compression mechanism unit 2 to the space inside the closed container 1.
  • the refrigerant delivered from the compression mechanism unit 2 passes through the gap portion of the electric motor 3 and is discharged to the outside of the compressor from the discharge pipe 16 connected to the upper container 12. At this time, the lubricating oil is wound up together with the refrigerant in the upward direction U where the upper container 12 is present. Then, a part of the lubricating oil is taken out of the compressor from the discharge pipe 16.
  • FIG. 2 is an explanatory view showing a cross section of the electric motor 3 according to the first embodiment.
  • FIG. 3 is a lower end view showing the stator 31 of the electric motor 3 according to the first embodiment as viewed from the downward direction D in which the compression mechanism portion 2 is arranged.
  • FIG. 4 is a lower end view showing the stator core 301 according to the first embodiment as viewed from the downward direction D in which the compression mechanism portion 2 is arranged.
  • the electric motor 3 is a brushless DC motor.
  • the electric motor 3 includes a stator 31 and a rotor 32.
  • the rotor 32 is arranged on the inner circumference of the stator 31.
  • the rotor 32 is a 6-pole permanent magnet type rotor, and is an embedded type permanent magnet type rotor in which a permanent magnet is inserted into a magnet insertion hole.
  • the stator 31 includes a stator core 301, a winding 302, an insulating film 303, a lower end insulator 304, and an upper end insulator 305. Be prepared.
  • the stator core 301 has a plurality of tee scores 301a which are divided cores distributed on the circumference.
  • the plurality of tee scores 301a are arranged in an annular shape with the rotation axis 21 as the central axis. That is, the central axis means the central axis of the distributed circumferences of the plurality of teeth 301b.
  • the tee score 301a is provided with a tee 301b extending inward in the direction of the central axis.
  • a slot 301c is formed between two adjacent teeth 301b.
  • the stator core 301 has a core back 301d on the outer side in the circumferential direction of the slot 301c.
  • a plurality of core backs 301d are arranged in the circumferential direction to form an outer shell of a stator core 301 composed of a plurality of tee scores 301a arranged in a ring shape.
  • the tea score 301a is formed by laminating a predetermined number of thin electromagnetic steel plates having a thickness of 0.25 mm, which are punched into a predetermined shape, and fixing them by caulking or the like.
  • the stator core 301 may be an integral core in which each tee score is integrally formed. Further, the stator core 301 also has a joint wrap structure in which the tee score 301a is rotatably connected by caulking formed by forming irregularities on an electronic steel plate between two adjacent teeth 301b in the core back 301d. good.
  • the winding 302 is wound around the teeth 301b.
  • the winding 302 is a conductive electric wire. Specifically, the winding 302 is wound around the body of the teeth 301b surrounded by the tee score 301a, the insulating film 303, the lower end insulator 304, and the upper end insulator 305 without any disturbance.
  • the insulating film 303 insulates the stator core 301 and the winding 302. Specifically, the insulating film 303 insulates between the winding 302 and the inner peripheral portion of the slot 301c.
  • the insulating film 303 is made of, for example, a PET (polyethylene terephthalate) film.
  • the insulating film 303 is fixed by a method such as fitting, bonding, or welding in which a groove for sandwiching the PET film is provided in the lower end insulator 304 and the upper end insulator 305.
  • the thickness of the insulating film 303 is as thin as about 0.1 to 0.2 mm. Therefore, the cross-sectional area of the insulating film 303 occupying the area of the slot 301c is very small. As a result, the insulating film 303 can be wound with many windings 302.
  • the lower end insulator 304 insulates between the winding 302 and the lower end of the teeth 301b in the central axial direction.
  • the lower end insulator 304 is arranged in the downward direction D on the compression mechanism portion 2 side of the stator core 301.
  • the upper end insulator 305 insulates between the winding 302 and the upper end of the teeth 301b in the central axis direction.
  • the upper end insulator 305 is located on the opposite side of the stator core 301 from the lower end insulator 304.
  • the lower end insulator 304 and the upper end insulator 305 are made of, for example, LCP (liquid crystal polymer).
  • the lower end insulator 304 and the upper end insulator 305 are fixed by a method such as fitting, bonding, or welding with the end of the tee score 301a.
  • FIG. 5 is a correlation diagram showing the winding 302 and the through groove 301a-1 according to the first embodiment.
  • FIG. 6 is a perspective view showing the stator core 301 in the state before mounting the winding 302 and the insulating film 303 according to the first embodiment.
  • FIG. 7 is an explanatory view showing the stator core 301 according to the first embodiment in a vertical cross section of the line AA of FIG.
  • FIG. 8 is an enlarged view showing a part of the stator core 301 according to the first embodiment in the A1 region of FIG.
  • the contact surface portion of the core back 301d with the insulating film 303 penetrates across both ends of the upward direction U and the downward direction D along the central axis direction. It has a groove 301a-1.
  • the through groove 301a-1 is a straight line having a constant width along the central axis direction.
  • a plurality of through grooves 301a-1 are arranged in parallel.
  • a plurality of through grooves 301a-1 in one stator core 301 extend radially outward from the central axis at the center of the winding portion of the winding 302 which is the center of the teeth 301b. It is configured to be line-symmetrical with respect to the virtual center line T.
  • four through grooves 301a-1 are provided on one side of the virtual center line T on the contact surface portion of the core back 301d of the tee score 301a with the insulating film 303.
  • the width B in the circumferential direction which is a direction orthogonal to the central axis direction of the through groove 301a-1, is smaller than the diameter 2R of the winding 302. That is, the relationship of B ⁇ 2R is satisfied.
  • the lower end insulator 304 communicates with the through groove 301a-1 and forms a first communication groove 304-1 extending at both ends in the upward direction U and the downward direction D.
  • the first communication groove 304-1 matches the groove shape of the through groove 301a-1 at the joint between the lower end insulator 304 and the tee score 301a.
  • the upper end insulator 305 has a lower end surface portion 305a which is a partition surface portion that blocks the penetration of the through groove 301a-1 in the upward direction U. That is, the partition surface portion is formed as a part of the flat lower end surface portion 305a of the upper end portion insulator 305.
  • the lower end surface portion 305a of the upper end portion insulator 305 has no groove and closes the through groove 301a-1. Specifically, the through groove 301a-1 is interrupted and closed at the joint portion between the upper end insulator 305 and the tee score 301a.
  • the refrigerant and lubricating oil delivered to the space inside the closed container 1 by the compression mechanism unit 2 are introduced from the downward direction D into the first communication groove 304-1 provided in the lower end insulator 304.
  • the refrigerant and lubricating oil introduced into the first communication groove 304-1 pass through the through groove 301a-1 provided in the tee score 301a.
  • the tee score 301a and the winding 302 can be cooled by the refrigerant.
  • the upper end insulator 305 blocks the outlets of the refrigerant and the lubricating oil flowing through the through groove 301a-1 to the upward direction U. Therefore, the lubricating oil flowing through the through groove 301a-1 is not wound up in the upper space of the closed container 1, and the increase in the oil circulation rate can be suppressed.
  • the number of the through groove 301a-1 of the tee score 301a and the first communication groove 304-1 of the lower end insulator 304 is plural.
  • the insulating film 303 spreads across the plurality of grooves, and the insulating film 303 is pressed into the plurality of grooves by the winding 302 and can be reliably held.
  • the pitch which is the width B of each groove, can be reduced, and it is difficult for the winding 302 to enter the through groove 301a-1 and the first communication groove 304-1.
  • a high-density winding 302 that maintains alignment can be performed, and the electric motor 3 can be configured with higher efficiency.
  • stator core 301 a gap is secured by the through groove 301a-1 between the tee score 301a and the winding 302.
  • the contact area between the winding 302 and the stator core 301 is reduced, the distance between the winding 302 and the stator core 301 is increased, and the floating static between the winding 302 and the stator core 301 is increased.
  • the electric capacity can be reduced.
  • the stator 31 of the electric motor 3 has a plurality of teeth 301b distributed on the periphery, and includes a stator core 301 in which a slot 301c is formed between adjacent teeth 301b.
  • the stator 31 of the electric motor 3 includes a winding 302 wound around the teeth 301b.
  • the stator 31 of the electric motor 3 includes an insulating film 303 that insulates between the winding 302 and the inner peripheral portion of the slot 301c.
  • the stator 31 of the electric motor 3 includes a lower end insulator 304 that insulates between the winding 302 and the lower end of the plurality of teeth 301b in the teeth 301b in the central axial direction.
  • the stator 31 of the electric motor 3 includes an upper end insulator 305 that insulates between the winding 302 and the upper end of the plurality of teeth 301b in the teeth 301b in the central axial direction.
  • the stator core 301 has an arc-shaped core back 301d that contacts the insulating film 303 on the outer side in the circumferential direction of the slot 301c.
  • the contact surface portion of the core back 301d with the insulating film 303 has through grooves 301a-1 extending at both ends in the upward direction U and the downward direction D along the central axial direction.
  • the lower end insulator 304 has a first communication groove 304-1 communicating with the through groove 301a-1 and extending at both ends in the upward direction U and the downward direction D.
  • the upper end insulator 305 has a lower end surface portion 305a which is a partition surface portion that blocks the penetration of the through groove 301a-1 in the upward direction U.
  • the refrigerant flowing into the through groove 301a-1 from the first communication groove 304-1 cools the winding 302 of the stator 31.
  • the refrigerant flowing into the through groove 301a-1 is blocked by the lower end surface portion 305a from penetrating the through groove 301a-1 to the upward direction U in the upper end insulator 305. That is, it is possible to prevent the lubricating oil that has flowed into the through groove 301a-1 together with the refrigerant from flowing upward from the lower end surface portion 305a.
  • a through groove 301a-1 is provided in the core back 301d, a distance between the winding 302 and the stator core 301 in the core back 301d can be secured, and the floating capacitance is maintained even if a thin insulating film 303 is interposed. Can be reduced.
  • the partition surface portion is the lower end surface portion 305a of the upper end portion insulator 305.
  • the flat lower end surface portion 305a of the upper end portion insulator 305 also serves as a partition surface portion, and the processing of the upper end portion insulator 305 is minimized.
  • the through groove 301a-1 is a straight line having a constant width along the central axis direction.
  • a plurality of through grooves 301a-1 are arranged.
  • the refrigerant flowing into the plurality of through grooves 301a-1 from the plurality of first communication grooves 304-1 cools the winding 302 of the stator 31.
  • the cooling effect of the stator 31 on the winding 302 can be obtained in a wide area of the core back 301d.
  • the plurality of through grooves 301a-1 are configured to be line-symmetrical with respect to the virtual center line T extending radially outward from the central axis at the center of the winding portion of the winding 302. ing.
  • the refrigerant flowing into the plurality of through grooves 301a-1 from the plurality of first communication grooves 304-1 cools the winding 302 of the stator 31 in a line-symmetrical and well-balanced manner with respect to the virtual center line T. To do. As a result, the cooling effect of the stator 31 on the winding 302 can be obtained more effectively in a wide area of the core back 301d.
  • the width B in the direction orthogonal to the central axis direction of the through groove 301a-1 is smaller than the diameter R2 of the winding 302.
  • the winding 302 does not fit into the through groove 301a-1, and the winding 302 can be easily wound.
  • the electric motor 3 includes the stator 31 of the electric motor 3 described above.
  • the electric motor 3 since the electric motor 3 includes the stator 31 of the electric motor 3, it is possible to suppress the removal of the lubricating oil to the outside of the compressor while maintaining the function of cooling the winding 302 of the stator 31. The reliability of the sealed compressor 100 can be ensured.
  • the sealed compressor 100 includes the above-mentioned electric motor 3.
  • the sealed compressor 100 includes the above-mentioned electric motor 3, it is possible to prevent the lubricating oil from being taken out of the compressor while maintaining the function of cooling the winding 302 of the stator 31, and it is sealed. The reliability of the mold compressor 100 can be guaranteed.
  • FIG. 9 is a perspective view showing the stator core 301 in the state before mounting the winding 302 and the insulating film 303 according to the second embodiment.
  • FIG. 10 is a correlation diagram showing an angle ⁇ formed by the through groove 301a-1 and the first communication groove 304-1 according to the second embodiment.
  • the description of the same items as in the first embodiment is omitted, and only the characteristic portion thereof is described.
  • the extension angle ⁇ of the first communication groove 304-1 of the lower end insulator 304 has an inclination of a predetermined angle with respect to the central axis direction in which the through groove 301a-1 extends.
  • the extension angle ⁇ of the first communication groove 304-1 of the lower end insulator 304 is the angle at which the winding 302 is separated from the winding position with respect to the central axis direction in which the through groove 301a-1 extends.
  • the first communication groove 304-1 communicates with the through groove 301a-1 and has the same groove shape.
  • the first communication groove 304-1 of the lower end insulator 304 is provided parallel to the central axis direction. Therefore, the insulating film 303 may enter the first communication groove 304-1 of the lower end insulator 304. Therefore, when winding the winding 302 in the central axis direction, there is a possibility that the winding 302 may enter the first communication groove 304-1 in which the insulating film 303 has entered.
  • the first communication groove 304-1 has an angle ⁇ with respect to the central axis direction. Therefore, it becomes difficult for the winding 302 to enter the first communication groove 304-1 when the winding 302 is wound.
  • the extension angle of the first communication groove 304-1 of the lower end insulator 304 is ⁇
  • the extension angle of ⁇ in the central axis direction of the through groove 301a-1 is 180 °. At this time, it is preferable that 150 ° ⁇ ⁇ ⁇ 180 ° is satisfied.
  • the extension angle ⁇ of the first communication groove 304-1 of the lower end insulator 304 has an inclination of a predetermined angle with respect to the central axis direction in which the through groove 301a-1 extends.
  • the extending angle ⁇ of the first communication groove 304-1 of the lower end insulator 304 is separated from the winding portion of the winding 302 with respect to the central axis direction in which the through groove 301a-1 extends. It has an inclination of the angle to go.
  • the extending angle ⁇ of the first communication groove 304-1 is opposite to that of the winding 302 around which the winding 302 is wound, and the winding 302 is rotated by the first communication groove 304-1 when the winding 302 is wound. This makes it difficult to enter and makes it easier to wind the winding 302.
  • the extension angle of the first communication groove 304-1 of the lower end insulator 304 is ⁇ and the extension angle of ⁇ in the central axis direction of the through groove 301a-1 is 180 °, 150 ° ⁇ ⁇ ⁇ 180 ° is satisfied.
  • the extension angle ⁇ of the first communication groove 304-1 can be set in the optimum opposite direction range from the winding 302 around which the winding 302 is wound, and the winding 302 is first communicated when the winding 302 is wound.
  • the groove 304-1 makes it difficult to enter, and makes it easier to wind the winding 302.
  • FIG. 11 is a correlation diagram showing Wmin and W in the tee score 301a according to the third embodiment.
  • the description of the same items as those in the first and second embodiments is omitted, and only the characteristic portion thereof is described.
  • the stator core 301 has the role of a magnetic path through which the magnetic field received from the rotor 32 passes. However, if the stator core 301 is provided with the through groove 301a-1, the magnetic path in the core back 301d is narrowed and the magnetic characteristics are deteriorated.
  • the ease of passage of the magnetic flux in the core back 301d is determined by the narrowest portion Wmin in the radial direction of the core back 301d shown in FIG. Therefore, the width of the portion of the core back 301d in which the through groove 301a-1 is formed is defined as W, and the width of the narrowest portion of the core back 301d in the radial direction is defined as Wmin. At this time, W ⁇ Wmin is satisfied.
  • stator core 301 is an iron core dividing surface as shown in FIG. 11, it is preferable to form the outermost diameter portion of the through groove 301a-1 on an arc passing through an intersection inside the iron core dividing surface or inside the arc.
  • the magnetic characteristics are not significantly impaired, the cooling effect of the stator 31 and the effect of reducing the floating capacitance can be further improved, and the electric motor 3 having excellent efficiency can be configured.
  • the radial width of the portion of the core back 301d where the through groove 301a-1 is formed is W, and the width of the core back 301d in the radial direction is the narrowest.
  • the width of the portion is Wmin. At this time, W ⁇ Wmin is satisfied.
  • the ease with which the magnetic flux passes in the core back 301d is determined by the narrowest portion Wmin in the radial direction of the core back 301d.
  • the width in the radial direction of the portion where the through groove 301a-1 is formed in the core back 301d is set to W, and W ⁇ Wmin is satisfied. Therefore, there is no portion of the core back 301d that is more difficult to pass the magnetic flux than Wmin, and the magnetic characteristics of the core back 301d are not significantly impaired.
  • the through groove 301a-1 can be formed deeply within the range where W ⁇ Wmin is satisfied, and the cooling effect of the stator 31 and the effect of reducing the floating capacitance can be further improved. As described above, the electric motor 3 having excellent efficiency can be configured.
  • FIG. 12 is an explanatory view showing the stator core 301 according to the fourth embodiment in a vertical cross section of the line AA of FIG.
  • FIG. 13 is an enlarged view showing a part of the stator core 301 according to the fourth embodiment in the A2 region of FIG.
  • the groove for introducing the refrigerant is provided only in the lower end insulator 304 on the compression mechanism side.
  • the upper end insulator 305 on the opposite side may also be provided with grooves having an adjusted shape or number.
  • the groove of the upper end insulator 305 needs to be closed by the partition surface portion.
  • the upper end insulator 305 communicates with the through groove 301a-1 and is formed halfway between the upper direction U and the lower direction D of the upper end insulator 305.
  • the second communication groove 305-1 is formed up to U in the upward direction from the winding portion of the winding 302.
  • the partition surface portion is the upper groove end surface portion 305b of the second communication groove 305-1.
  • the upper groove end face portion 305b has a flat surface along the horizontal direction.
  • An opening 305c opened in a direction orthogonal to the central axial direction along the upward direction U and the downward direction D is formed between the upper groove end surface portion 305b which is a partition surface portion and the winding portion of the winding 302. Has been done.
  • the opening 305c allows the refrigerant outlet to be formed in the horizontal direction. Therefore, the circulation rate of the refrigerant is increased, and the cooling effect of the stator 31 is further improved.
  • the upper end insulator 305 communicates with the through groove 301a-1 and forms a second communication groove 305-1 formed halfway between the upper direction U and the lower direction D of the upper end insulator 305.
  • the second communication groove 305-1 is formed up to U in the upward direction from the winding portion of the winding 302.
  • the partition surface portion is the upper groove end surface portion 305b of the second communication groove 305-1.
  • the refrigerant flowing through the through groove 301a-1 reaches the second communication groove 305-1 formed up to the winding point U of the winding 302, so that the refrigerant flows to the upper end insulator 305.
  • a cooling effect can be obtained for all of the wound windings 302.
  • the partition surface portion is the upper groove end surface portion 305b of the second communication groove 305-1
  • the direction U is higher than the upper groove end surface portion 305b which is the partition surface portion of the lubricating oil that has flowed into the through groove 301a-1 together with the refrigerant. Can be prevented from flowing out.
  • an opening 305c opened in a direction orthogonal to the central axis direction is formed between the upper groove end surface portion 305b which is a partition surface portion and the winding portion of the winding 302. ..
  • the refrigerant and the lubricating oil that have risen upward to the second communication groove 305-1 are directed not toward the upward direction U but toward the opening 305c opened in the direction orthogonal to the central axis direction, and the lubricating oil.
  • the outflow to the upward U can be prevented.
  • the refrigerant and the lubricating oil circulate efficiently in this order in the first communication groove 304-1, the through groove 301a-1, and the second communication groove 305-1, and the lubricant 31 is wound without the lubricating oil accumulating in the middle.
  • the cooling effect of the wire 302 can be efficiently obtained.
  • first embodiment, the second embodiment, the third embodiment and the fourth embodiment may be combined or applied to other parts.
  • FIG. 14 is a refrigerant circuit diagram showing a refrigerating cycle device 101 to which the sealed compressor 100 according to the fifth embodiment is applied.
  • the refrigeration cycle device 101 includes a closed compressor 100, a condenser 102, an expansion valve 103, and an evaporator 104. These sealed compressor 100, condenser 102, expansion valve 103 and evaporator 104 are connected by a refrigerant pipe to form a refrigerant circuit. Then, the refrigerant flowing out of the evaporator 104 is sucked into the closed compressor 100 and becomes high temperature and high pressure. The high temperature and high pressure refrigerant is condensed in the condenser 102 to become a liquid. The liquid refrigerant is decompressed and expanded by the expansion valve 103 to become a low-temperature low-pressure gas-liquid two-phase, and the gas-liquid two-phase refrigerant heat exchanges in the evaporator 104.
  • the closed compressor 100 of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment can be applied to such a refrigeration cycle device 101.
  • the refrigeration cycle device 101 include an air conditioner, a refrigeration device, a water heater, and the like.
  • the refrigeration cycle device 101 includes the above-mentioned sealed compressor 100.
  • the refrigerating cycle device 101 since the refrigerating cycle device 101 includes the above-mentioned sealed compressor 100, it is possible to suppress the taking out of the lubricating oil to the outside of the compressor while maintaining the function of cooling the winding 302 of the stator 31. , The reliability of the sealed compressor 100 can be guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

Ce stator de moteur électrique est pourvu d'un noyau de stator, d'un enroulement, d'un film isolant, d'un isolant d'extrémité inférieure et d'un isolant d'extrémité supérieure. Le noyau de stator a un dos de noyau en contact avec le film isolant à l'extérieur d'une fente dans la direction circonférentielle. Une partie de surface de contact avec le film isolant dans le dos de noyau a une rainure de pénétration le long de la direction d'axe central sur les deux extrémités dans une direction haut-bas. L'isolant d'extrémité inférieure a une première rainure de communication en communication avec la rainure de pénétration sur les deux extrémités dans la direction haut-bas. L'isolant d'extrémité supérieure a une partie de surface de séparation pour sceller la pénétration de la rainure de pénétration dans la direction haut-bas.
PCT/JP2019/018380 2019-05-08 2019-05-08 Stator de moteur électrique, moteur électrique, compresseur hermétique et dispositif à cycle de réfrigération WO2020225872A1 (fr)

Priority Applications (2)

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PCT/JP2019/018380 WO2020225872A1 (fr) 2019-05-08 2019-05-08 Stator de moteur électrique, moteur électrique, compresseur hermétique et dispositif à cycle de réfrigération
JP2021518248A JP7170855B2 (ja) 2019-05-08 2019-05-08 電動機の固定子、電動機、密閉型圧縮機及び冷凍サイクル装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030062780A1 (en) * 2001-10-03 2003-04-03 Nissan Motor Co., Ltd. Rotating electric machine and cooling structure for rotating electric machine
JP2012023818A (ja) * 2010-07-12 2012-02-02 Mitsubishi Electric Corp 電動機の固定子
JP2013013192A (ja) * 2011-06-28 2013-01-17 Nissan Motor Co Ltd ステーター及びインシュレーター
JP2014222977A (ja) * 2013-05-14 2014-11-27 日立アプライアンス株式会社 電動機及びこれを用いた空気調和機
WO2017146117A1 (fr) * 2016-02-26 2017-08-31 Ntn株式会社 Bobine d'isolation de machine électrique tournante

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030062780A1 (en) * 2001-10-03 2003-04-03 Nissan Motor Co., Ltd. Rotating electric machine and cooling structure for rotating electric machine
JP2012023818A (ja) * 2010-07-12 2012-02-02 Mitsubishi Electric Corp 電動機の固定子
JP2013013192A (ja) * 2011-06-28 2013-01-17 Nissan Motor Co Ltd ステーター及びインシュレーター
JP2014222977A (ja) * 2013-05-14 2014-11-27 日立アプライアンス株式会社 電動機及びこれを用いた空気調和機
WO2017146117A1 (fr) * 2016-02-26 2017-08-31 Ntn株式会社 Bobine d'isolation de machine électrique tournante

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JPWO2020225872A1 (ja) 2021-10-14

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