electric motor for compressor

Abstract

This utility model relates to an electric motor for compressors, which can efficiently fix the end of the winding. The electric motor for compressors includes: a stator core having teeth for winding; a coil wound around the teeth; and a winding end plate disposed on the axial end side of the stator core, having a holding portion for holding the winding extending from the coil.

Description

Technical Field

[0001] The embodiments of this utility model relate to electric motors for compressors. Background Technology

[0002] In the past, for example, in the manufacture of electric motors using winding machines, insulation was achieved by covering the windings leading from the coil with insulating tubes or by connecting the wrapped wires to the ends of the coil in order to wind the windings that come out from each phase at the beginning or end of the winding. Furthermore, the insulated windings were wound at the upper part of the coil section and then concentrated and fixed by wires or sleeves.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2022-15017 However, in conventional structures, such as those where the winding is wound incrementally for each slot, the winding needs to be fixed for each slot, which increases the working hours and costs. Utility Model Content

[0004] This invention provides a compressor motor that can efficiently fix the ends of the windings.

[0005] The compressor motor of the embodiment includes: a stator core having teeth for winding a coil; a coil wound around the teeth; and a winding end plate disposed on the axial end side of the stator core, having a holding portion for holding the winding extending from the coil.

[0006] The compressor motor in the embodiment may also have the retaining part disposed at a position that covers at least one of the coils of each phase.

[0007] The compressor motor in the embodiment may also have the winding end plate disposed at a position corresponding to the slot between adjacent teeth, and having a hole formed through the winding end plate.

[0008] The compressor motor in the embodiment may also be configured such that the holding part is capable of separately holding the windings of different phases.

[0009] The compressor motor in the embodiment may also include an insulating end plate disposed on the end side of the stator core, wherein the winding end plate is connected and fixed to the insulating end plate.

[0010] The compressor motor in the embodiment may also be made of a material that is resistant to refrigerants and oil. Attached Figure Description

[0011] Figure 1This is a diagram that schematically illustrates an example of a compressor according to one embodiment, and is also a partial view of the interior.

[0012] Figure 2 This is a schematic diagram illustrating an example of a compressor motor according to one embodiment, excluding the stator, and is along... Figure 1 The diagram shows the direction of the X2-X2 line.

[0013] Figure 3 This is an example of a compressor motor in one embodiment. Figure 2 The diagram shows the state of the winding end plate excluding the winding end plate.

[0014] Figure 4 This is a schematic representation of an example of a compressor electric motor according to one embodiment. Figure 2 Diagrams of the stator core viewed from the same direction.

[0015] Figure 5 This is a schematic representation of an example of a compressor electric motor according to one embodiment. Figure 2 A diagram of the winding end plate viewed from the same direction.

[0016] Figure 6 This is an enlarged representation of an example of a compressor electric motor according to one embodiment. Figure 2 The diagram of the X6-X6 line section.

[0017] Explanation of reference numerals in the attached figures 1…compressor; 20…motor for compressor; 30…stator; 31…stator core; 311…tooth; 312…slot; 60…insulating end plate; 70…winding end plate; 71…holding part; 72…hole part; 80…winding; 81…coil. Detailed Implementation

[0018] Hereinafter, one embodiment will be described with reference to the accompanying drawings. Figure 1 The compressor 1 shown can be used as a component of a refrigeration cycle, for example. The compressor 1 is used in connection with external equipment such as an evaporator and a condenser. The compressor 1 draws in refrigerant flowing from the external equipment, compresses the refrigerant within itself, and supplies the refrigerant to the external equipment. The compressor 1 can be, for example, a single-cylinder type with one compression chamber within the compressor body 10, a double-cylinder type with two compression chambers, or a three-cylinder type with three compression chambers—a rotary compressor.

[0019] like Figure 1 As shown, the compressor 1 includes a discharge pipe 2, an inflow pipe 3, a suction pipe 4, a liquid receiver 5, and a compressor body 10. Figure 1 The compressor 1 shown is an example of a twin-cylinder rotary compressor. Compressor 1 uses... Figure 1 Used for the posture settings, Figure 1 The vertical direction of the paper is taken as the vertical direction of compressor 1.

[0020] The compressor body 10 includes a sealed container 11, a rotating shaft 12, an oil separator 13, and an electric motor 20. The sealed container 11 is, for example, made of metal and integrally formed into a cylindrical shape. The rotating shaft 12, the electric motor 20, and a compression mechanism (not shown) are housed inside the sealed container 11, and it is filled with refrigerant.

[0021] The rotating shaft 12 connects the electric motor 20 to a compression mechanism (not shown) and functions to transmit the rotational motion of the electric motor 20 to the compression mechanism. When driven by the electric motor 20, the compression mechanism compresses the refrigerant within the sealed container 11 and discharges it to the outside of the sealed container 11. In this case, the discharge pipe 2 is connected, for example, to the upper part of the sealed container 11 and extends upwards from the sealed container 11. An oil separator 13 is disposed on the upper end face of the rotating shaft 12 and rotates together with the rotating shaft 12. The oil separator 13 functions to separate lubricating oil from the compressed refrigerant by the centrifugal force of rotation.

[0022] The receiver 5 and the compressor body 10 are connected by a suction pipe 4. The suction pipe 4 extends from the bottom of the receiver 5 and connects to the lower part of the outer side of the sealed container 11. When the compressor body 10 operates, the refrigerant inside the compressor body 10 is compressed. Then, the compressed refrigerant is discharged from the discharge pipe 2 to the outside of the compressor body 10, supplied to an external device (not shown).

[0023] Furthermore, through the discharge of this refrigerant, a negative pressure is created on the suction pipe 4 side of the compressor body 10. As a result, the refrigerant in the receiver 5 is drawn into the compressor body 10 through the suction pipe 4, and the refrigerant flowing out from the external device (not shown) is drawn into the receiver 5 through the inlet pipe 3. The refrigerant flowing into the receiver 5 is then adjusted to a certain pressure and supplied to the compressor body 10.

[0024] The electric motor 20 is a motor for the compressor, and can be, for example, a brushless DC motor. The electric motor 20 has a stator 30, a rotor 40, leads 50, insulating end plates 60, and winding end plates 70. The stator 30 is fixed inside the sealed container 11. The stator 30 is integrally formed into a cylindrical shape and has a stator core 31 and coils 32.

[0025] The stator core 31 is constructed, for example, by laminating electromagnetic steel plates through riveting. Figure 4 As shown, the stator core 31 has a plurality of teeth 311. The teeth 311 are arranged at predetermined intervals in the circumferential direction of the stator core 31. Slots 312 are formed between adjacent teeth 311. Furthermore, as... Figure 3 As shown, coil 32 is constructed by winding winding 321 on teeth 311.

[0026] The rotor 40 is configured, for example, to have a rotor core 41 and a permanent magnet (not shown). The rotor 40 is arranged with a small gap inside the stator 30 to enable rotation. The rotor 40 is connected to the rotating shaft 12. The central axis of the rotor 40 and the rotating shaft 12 coincides with the central axis of the stator 30.

[0027] Lead wire 50 is a wire connected to a portion of winding 321 or winding 321, such as... Figure 1 As shown, the lead wire 50 is led out from the coil 32 and connected to the sealed terminal section 14. The lead wire 50 is a wire that supplies power to the coil 32 of the stator 30 via the sealed terminal section 14, also known as a lead wire. The number of lead wires 50 varies depending on the type of motor 20. In this embodiment, the motor 20 has three lead wires 50.

[0028] Insulating end plates 60 are disposed at both ends of the stator 30 along its axial direction. The insulating end plates 60 can be integrally molded from electrically insulating materials, such as polybutylene terephthalate (PBT), liquid crystal polymers (Liquid Crystal Polymer, Liquid Crystal Plastic, LCP, semi-aromatic polyesters), polyphenylene sulfide (PPS), or polyamide (PA). Preferably, the insulating end plates 60 are made of materials that are resistant to refrigerants and oil.

[0029] Insulating paper (not shown) is inserted into each slot 312 of the stator core 31 and held by the insulating end plate 60. Furthermore, the winding 321 is wound around the teeth 311 with respect to the insulating end plate 60 and the insulating paper. Thus, the winding 321 is electrically insulated from the stator core 31 by the insulating end plate 60 and the insulating paper (not shown). Alternatively, the motor 20 may replace the insulating end plate 60 and the insulating paper by having a winding tube that functions as both the insulating end plate 60 and the insulating paper.

[0030] like Figure 1 As shown, the winding end plate 70 is disposed on the axial end side of the stator core 31 on the lead wire 50 side. Like the insulating end plate 60, the winding end plate 70 can be integrally molded from an electrically insulating material, such as polybutylene terephthalate (PBT), liquid crystal polymer (Liquid Crystal Polymer, Liquid Crystal Plastic, LCP, semi-aromatic polyester), polyphenylene sulfide (PPS), or polyamide (PA). Like the insulating end plate 60, the winding end plate 70 is preferably made of a material with refrigerant resistance and oil resistance.

[0031] like Figure 5As shown, the winding end plate 70 is generally formed in the shape of a circular ring plate. The winding end plate 70 covers at least three coils 32 arranged consecutively. In the case that the motor 20 is a three-phase AC motor, the winding end plate 70 covers at least the coils 32 of the U phase, V phase, and W phase. In this embodiment, the winding end plate 70 covers all coils 32. Furthermore, the winding end plate 70 is connected and fixed to the insulating end plate 60. In this case, the winding end plate 70 and the insulating end plate 60 are configured such that, for example, one is embedded into the other, they can be joined together without the use of fastening components such as screws.

[0032] The winding end plate 70 has multiple retaining portions 71 and multiple hole portions 72. For example... Figure 6 As shown, the retaining portion 71 protrudes upward from the upper surface of the winding end plate 70, i.e., the surface of the lead wire 50. The retaining portion 71 is, for example, cylindrical and positioned to overlap with the tooth 311. In this embodiment, the outer diameter of the retaining portion 71 is set to be smaller the further towards the radial center of the winding end plate 70. In this case, retaining portions 71 with the same outer diameter are arranged at predetermined intervals on concentric circles having the same center as the center of the winding end plate 70.

[0033] The retaining portion 71 is configured to separately retain the windings 321 of different phases. In the case where the motor 20 is a three-phase AC motor, the retaining portion 71 can separately retain the windings 321 of the U-phase, V-phase, and W-phase. That is, in this embodiment, when viewed along the diameter direction of the winding end plate 70, four retaining portions 71 are arranged in a row on the winding end plate 70. Therefore, it is possible to separate the windings 321 of the four arranged retaining portions 71. Figure 5 Different phase windings 321 are held on circumferences A, B, and C respectively. Holding part 71 is provided at least one of each of the coils 32 covering each phase, in this case, the U-phase, V-phase, and W-phase coils 32.

[0034] The hole 72 is formed by penetrating the winding end plate 70 along its thickness direction. The hole 72 is provided between adjacent teeth 311, that is, at positions corresponding to each slot 312. For example, the hole 72 is provided between the holding portions 71 and is formed as a rectangle that is longer in the radial direction of the winding end plate 70. The width dimension of the hole 72, that is, the circumferential dimension of the winding end plate 70, is preferably set to be greater than or equal to the dimension between the teeth 311, that is, the circumferential dimension of the slot 312.

[0035] In this case, for example, Figure 2 and Figure 3 As shown, the three-phase windings 321 are interconnected at the neutral point 322 and fixed to the insulating end plate 60. That is, as Figure 2As shown, the winding 321 extending from the coil 32 is held by the holding portion 71 of the winding end plate 70. In this case, at least one end of the winding 321 constituting the coil 32, either at the start of winding or the end of winding, engages with the end of the winding 321 of the other coil 32.

[0036] According to the embodiment described above, the compressor motor 20 includes a stator core 31, a coil 32, and a winding end plate 70. The stator core 31 has teeth 311 for winding the winding 321. The coil 32 is configured to wind the winding 321 around the teeth 311. Furthermore, the winding end plate 70 has a holding portion 71. The holding portion 71 is provided on the axial end side of the stator core 31 to hold the winding 321 extending from the coil 32.

[0037] Therefore, when manufacturing the motor 20 using a winding machine, the operator can hold the end of the winding 321 extending from the coil 32 in the holding portion 71 of the winding end plate 70. Thus, when manufacturing the coil 32 by winding the winding 321 for each slot 312, the operator can easily fix the winding 321 for each slot 312. As a result, the motor 20 according to this embodiment can efficiently and reliably fix the end of the winding 321, thereby improving the manufacturing efficiency of the motor 20.

[0038] Furthermore, by keeping the winding 321 on the winding end plate 70 instead of the insulating end plate 60, the winding 321 leading out from the coil 32 can be smoothly configured without changing the shape of the insulating end plate 60, such as its dimensions in the height direction, and insulation is ensured. As a result, a highly reliable motor 20 can be provided.

[0039] The retaining part 71 is provided at a position covering at least one coil 32 of each phase. For example, in the case that the motor 20 is a three-phase AC motor, the retaining part 71 is provided at a position covering at least one coil 32 of each of the U phase, V phase and W phase.

[0040] Therefore, the windings 321 drawn from the coils 32 of each phase can be kept near the coils 32 of each phase. Thus, the windings 321 can be smoothly configured without the need for long-distance winding of the windings 321 drawn from the coils 32 of each phase, and insulation is ensured. As a result, a more reliable motor 20 can be provided.

[0041] The winding end plate 70 has a hole 72. The hole 72 is located at a position corresponding to the slot 312 between adjacent teeth 311 and is formed through the winding end plate 70. As a result, the refrigerant in the sealed container 11 can easily circulate through the hole 72. Therefore, the flow of refrigerant that is hindered by the winding end plate 70 can be greatly suppressed, and as a result, a highly reliable motor 20 and compressor 1 can be provided.

[0042] The retaining part 71 is configured to separately retain the windings 321 of different phases. As a result, the insulation of the windings 321 of each phase can be ensured, thus providing a highly reliable motor 20.

[0043] The electric motor 20 also includes an insulating end plate 60 disposed on the end side of the stator core 31. Furthermore, a winding end plate 70 is connected and fixed to the insulating end plate 60. Therefore, by connecting and fixing the winding end plate 70 to the insulating end plate 60, displacement of the winding end plate 70 relative to the stator core 31 can be suppressed. As a result, the position of the winding 321 held in the holding portion 71 can be stabilized, thus suppressing adverse conditions caused by movement of the winding 321. Consequently, the reliability of the electric motor 20 can be improved.

[0044] The winding end plate 70 is made of a material that is resistant to refrigerants and oil. As a result, the deterioration of the winding end plate 70 due to the refrigerant environment of the compressor 1 can be suppressed, thereby further improving the reliability of the motor 20 and the compressor 1.

[0045] This disclosure is based on embodiments, but it should be understood that this disclosure is not limited to those embodiments or constructions. This disclosure also includes various modifications and equivalent variations. In addition, various combinations, methods, and other combinations or methods that include only one element, or more or less, also fall within the scope and spirit of this disclosure.

Claims

1. An electric motor for a compressor, characterized in that, have: The stator core has teeth for winding. A coil, formed by winding the winding around the teeth; and A winding end plate is disposed on the axial end side of the stator core and has a retaining portion for holding the winding extending from the coil.

2. The electric motor for a compressor according to claim 1, characterized in that, The retaining part is disposed at a position that covers at least one of the coils of each phase.

3. The electric motor for a compressor according to claim 1, characterized in that, The winding end plate is positioned at a slot corresponding to the adjacent tooth and has a hole formed through the winding end plate.

4. The electric motor for a compressor according to claim 1, characterized in that, The holding part is configured to hold the windings of different phases separately.

5. The electric motor for a compressor according to claim 1, characterized in that, It also includes an insulating end plate disposed on the end side of the stator core. The winding end plate is connected and fixed to the insulating end plate.

6. The electric motor for a compressor according to claim 1, characterized in that, The winding end plate is made of a material that is resistant to refrigerants and oil.

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