Electric motor for compressor

Abstract

To efficiently secure the ends of the windings. [Solution] The motor for the compressor comprises a stator core having teeth around which windings are wound, a coil formed by windings being wound around the teeth, and a routing end plate provided on the axial end of the stator core and having a holding portion for holding the windings extending from the coil.

Description

【Technical Field】 【0001】 Embodiments of the present invention relate to an electric motor for a compressor. 【Background Art】 【0002】 Conventionally, for example, in the manufacture of an electric motor using a winding machine, in order to route the starting or ending windings emerging from each phase, the windings drawn out from the coil are covered with an insulating tube, or a covered wire is connected to the end of the coil to provide insulation. Then, the windings thus insulated are routed above the coil portion and bundled and fixed with a thread, an insulator, or the like. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2022-15017 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in the conventional configuration, for example, when winding windings for each slot, it is necessary to fix the windings for each slot, which causes an increase in the number of work steps and an increase in cost. 【0005】 Therefore, an electric motor for a compressor that can efficiently fix the terminals of the windings is provided. 【Means for Solving the Problems】 【0006】 The electric motor for a compressor according to an embodiment includes a stator core having teeth around which windings are wound, a coil configured by winding the windings around the teeth, and a lead-back end plate provided at an end side in the axial direction of the stator core and having a holding portion that holds the windings extending from the coil. 【Brief Description of the Drawings】 【0007】 [Figure 1] Figure 1 schematically shows an example of a compressor according to one embodiment, and is a partial view of the internal structure. [Figure 2] Figure 2 schematically shows an example of a compressor motor according to one embodiment, excluding the stator, and is shown along the X2-X2 line direction in Figure 1. [Figure 3] Figure 3 shows an example of a compressor motor according to one embodiment, excluding the routing end plate from the state shown in Figure 2. [Figure 4] Figure 4 is a schematic diagram showing the stator core of an example of a compressor motor according to one embodiment, viewed from the same direction as in Figure 2. [Figure 5] Figure 5 is a schematic diagram showing the routing end plate of an example of a compressor motor according to one embodiment, viewed from the same direction as in Figure 2. [Figure 6] Figure 6 is an enlarged view of the portion of Figure 2 shown along the line X6-X6, illustrating an example of a motor for a compressor according to one embodiment. [Modes for carrying out the invention] 【0008】 The following describes one embodiment with reference to the drawings. The compressor 1 shown in Figure 1 can be used, for example, as a component of a refrigeration cycle. The compressor 1 is used in connection with external equipment such as an evaporator or a condenser. The compressor 1, for example, sucks in refrigerant that has leaked out from the external equipment, compresses the refrigerant within the compressor 1, and supplies the refrigerant to the external equipment. The compressor 1 can be configured as a rotary compressor of the type having one compression chamber in the compressor body 10, a type having two compression chambers, or a type having three compression chambers. 【0009】 As shown in Figure 1, the compressor 1 comprises a discharge pipe 2, an inlet pipe 3, a suction pipe 4, an accumulator 5, and a compressor body 10. The compressor 1 shown in Figure 1 is an example of a two-cylinder rotary compressor. The compressor 1 is installed and used in the position shown in Figure 1, and the vertical direction of the paper in Figure 1 is the vertical direction of the compressor 1. 【0010】 The compressor body 10 comprises a sealed container 11, a rotating shaft 12, an oil separator 13, and an electric motor 20. The sealed container 11 is made of metal, for example, and is formed in a cylindrical shape overall. The sealed container 11 houses the rotating shaft 12, the electric motor 20, and a compression mechanism (not shown), and is filled with refrigerant. 【0011】 The rotating shaft 12 connects the electric motor 20 to a compression mechanism (not shown) and has the function of transmitting 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 in 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 top of the sealed container 11 and extends upward above the sealed container 11. The oil separator 13 is provided on the upper end surface of the rotating shaft 12 and rotates together with the rotating shaft 12. The oil separator 13 has the function of separating lubricating oil from the compressed refrigerant by the centrifugal force of rotation. 【0012】 The accumulator 5 and the compressor body 10 are connected by a suction pipe 4. The suction pipe 4 extends from the bottom of the accumulator 5 and is connected to the lower part of the outer surface of the sealed container 11. When the compressor body 10 operates, the refrigerant inside the compressor body 10 is compressed. The compressed refrigerant is then discharged from the discharge pipe 2 to the outside of the compressor body 10 and supplied to external equipment (not shown). 【0013】 Furthermore, the discharge of this refrigerant creates negative pressure on the suction pipe 4 side of the compressor body 10. As a result, the refrigerant in the accumulator 5 is drawn into the compressor body 10 through the suction pipe 4, and refrigerant leaking out from external equipment (not shown) is drawn into the accumulator 5 through the inlet pipe 3. The refrigerant that flows into the accumulator 5 is then adjusted to a constant pressure and supplied to the compressor body 10. 【0014】 The electric motor 20 is an electric motor for the compressor and can be made up of, for example, a brushless DC motor. The electric motor 20 has a stator 30, a rotor 40, lead wires 50, insulating end plates 60, and routing end plates 70. The stator 30 is fixed inside the sealed container 11. The stator 30 is formed in a cylindrical shape as a whole and has a stator core 31 and coils 32. 【0015】 The stator core 31 is constructed by laminating, for example, electromagnetic steel sheets by crimping. As shown in Figure 4, 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. The coil 32 is constructed by winding wire 321 around the teeth 311, as shown in Figure 3. 【0016】 The rotor 40 is composed of, for example, a rotor core 41 and permanent magnets (not shown). The rotor 40 is rotatably positioned inside the stator 30 with a small gap between them. The rotor 40 is connected to the rotating shaft 12. The central axes of the rotor 40 and the rotating shaft 12 coincide with the central axis of the stator 30. 【0017】 The lead wires 50 are part of the winding 321 or wires connected to the winding 321, and as shown in Figure 1, they are drawn out from the coil 32 and connected to the sealed terminal section 14. The lead wires 50 are wires that supply power to the coil 32 of the stator 30 via the sealed terminal section 14, and are so-called lead wires. Multiple lead wires 50 are provided depending on the type of electric motor 20. In this embodiment, the electric motor 20 is equipped with three lead wires 50. 【0018】 The insulating end plates 60 are provided on both end sides of the stator 30 in the axial direction. The insulating end plates 60 can be formed of an integrally molded product of a material having electrical insulation properties, such as polybutylene terephthalate (PBT), liquid crystal polymer (Liquid Crystal Polymer, Liquid Crystal Plastic, LCP, semi- or wholly aromatic polyester), polyphenylene sulfide (PPS), or polyamide (PA). The insulating end plates 60 are preferably formed of a material having refrigerant resistance and oil resistance. 【0019】 Insulating paper (not shown) is inserted into each slot 312 of the stator core 31 and held by the insulating end plates 60. Then, the winding 321 is wound around the teeth 311 via the insulating end plates 60 and the insulating paper. Thereby, the winding 321 is electrically insulated from the stator core 31 by the insulating end plates 60 and the insulating paper (not shown). Note that the motor 20 may have a bobbin having the functions of the insulating end plates 60 and the insulating paper instead of the insulating end plates 60 and the insulating paper. 【0020】 As shown in FIG. 1 and the like, the lead-back end plate 70 is provided on the end side in the axial direction of the stator core 31 on the lead wire 50 side. Similar to the insulating end plates 60, the lead-back end plate 70 can be formed of an integrally molded product of a material having electrical insulation properties, such as polybutylene terephthalate (PBT), liquid crystal polymer (Liquid Crystal Polymer, Liquid Crystal Plastic, LCP, semi- or wholly aromatic polyester), polyphenylene sulfide (PPS), or polyamide (PA). Similar to the insulating end plates 60, the lead-back end plate 70 is preferably formed of a material having refrigerant resistance and oil resistance. 【0021】 As shown in FIG. 5 and the like, the lead-back end plate 70 is formed in an annular plate shape as a whole. The lead-back end plate 70 covers at least three continuously arranged coils 32. When the electric motor 20 is a three-phase AC electric motor, the lead-back end plate 70 covers at least the three-phase coils 32 of the U-phase, V-phase, and W-phase. In the case of this embodiment, the lead-back end plate 70 covers all the coils 32. Further, the lead-back end plate 70 is connected and fixed to the insulating end plate 60. In this case, the lead-back end plate 70 and the insulating end plate 60 are configured to be able to be mutually coupled without using a fastening member such as a screw, for example, by one fitting into the other. 【0022】 The lead-back end plate 70 has a plurality of holding portions 71 and a plurality of hole portions 72. As shown in FIG. 6 and the like, the holding portion 71 is provided so as to protrude upward from the upper surface of the lead-back end plate 70, that is, the surface of the lead-out line 50. The holding portion 71 is configured, for example, in a columnar shape and is provided at a position overlapping the teeth 311. In the case of this embodiment, it is set such that the outer diameter of the holding portion 71 becomes smaller as it approaches the center in the radial direction of the lead-back end plate 70. In this case, the holding portions 71 having the same outer diameter are arranged at a predetermined interval on concentric circles having the same center as the center of the lead-back end plate 70. 【0023】 The holding portion 71 is configured to be able to hold the windings 321 of different phases apart. When the electric motor 20 is a three-phase AC electric motor, the holding portion 71 can hold the three-phase windings 321 of the U-phase, V-phase, and W-phase apart. That is, in this embodiment, when viewed in the diameter direction of the lead-back end plate 70, four holding portions 71 are provided side by side on the lead-back end plate 70. Therefore, between the four side-by-side holding portions 71, that is, on the circumferences A, B, and C in FIG. 5, the windings 321 of different phases can be held respectively. The holding portion 71 is provided at a position covering at least one of the coils 32 of each phase, in this case, the coils 32 of the U-phase, V-phase, and W-phase. 【0024】 The holes 72 are formed by penetrating the end plate 70 in the thickness direction. The holes 72 are located between adjacent teeth 311, that is, at positions corresponding to each slot 312. The holes 72 are located, for example, between the holding portions 71, and are formed as elongated rectangles in the radial direction of the end plate 70. It is preferable that the width dimension of the holes 72, i.e., the circumferential dimension of the end plate 70, be set to be greater than or equal to the dimension between the teeth 311, i.e., the circumferential dimension of the slot 312. 【0025】 In this case, each of the three phase windings 321 is connected to each other at a neutral point 322 and fixed to an insulating end plate 60, as shown in Figures 2 and 3, for example. That is, as shown in Figure 2, the windings 321 extending from the coil 32 are held by the holding portion 71 of the routing end plate 70. In this case, at least one end of the windings 321 constituting the coil 32, either the beginning or the end of the winding, is joined to the end of the windings 321 of the other coil 32. 【0026】 According to the embodiment described above, the motor 20 for the compressor comprises a stator core 31, a coil 32, and a lead end plate 70. The stator core 31 has teeth 311 around which the winding 321 is wound. The coil 32 is constructed by winding the winding 321 around the teeth 311. The lead end plate 70 has a holding portion 71. The holding portion 71 is provided on the axial end side of the stator core 31 and holds the winding 321 extending from the coil 32. 【0027】 According to this, when manufacturing the electric motor 20 using a winding machine, the operator can hold the ends of the windings 321 extending from the coil 32 in the holding portion 71 of the winding end plate 70. Therefore, the operator can easily fix the windings 321 for each slot 312, for example, when manufacturing the coil 32 by winding the windings 321 around each slot 312. As a result, with the electric motor 20 of this embodiment, the ends of the windings 321 can be fixed efficiently and reliably, thereby improving the manufacturing efficiency of the electric motor 20. 【0028】 Furthermore, by holding the winding 321 on the routing end plate 70 instead of the insulating end plate 60, insulation can be ensured while smoothly arranging the winding 321 drawn from the coil 32 without changing the shape of the insulating end plate 60, for example, its height dimension. This makes it possible to provide a highly reliable electric motor 20. 【0029】 The holding portion 71 is positioned to cover at least one coil 32 of each phase. For example, if the motor 20 is a three-phase AC motor, the holding portion 71 is positioned to cover at least one coil 32 of the U-phase, V-phase, and W-phase. 【0030】 According to this, the windings 321 drawn from each phase coil 32 can be held in the vicinity of each phase coil 32. Therefore, the windings 321 drawn from each phase coil 32 can be smoothly positioned and insulation can be ensured without routing the windings 321 over long distances. As a result, a more reliable motor 20 can be provided. 【0031】 The routing end plate 70 has a hole 72. The hole 72 is provided at a position corresponding to the slot 312 between adjacent teeth 311 and is formed to penetrate the routing end plate 70. This makes it easier for the refrigerant in the sealed container 11 to circulate through the hole 72. Therefore, obstruction of the refrigerant flow due to the provision of the routing end plate 70 can be suppressed as much as possible, and as a result, a highly reliable electric motor 20 and compressor 1 can be provided. 【0032】 The holding section 71 is configured to hold the windings 321 of different phases separately. This ensures insulation of the windings 321 of each phase, thereby providing a highly reliable motor 20. 【0033】 The electric motor 20 is further equipped with insulating end plates 60 provided on the end side of the stator core 31. The routing end plate 70 is connected and fixed to the insulating end plate 60. By connecting and fixing the routing end plate 70 to the insulating end plate 60, it is possible to suppress displacement of the routing end plate 70 relative to the stator core 31. As a result, the position of the winding 321 held by the holding part 71 can be stabilized, and malfunctions caused by movement of the winding 321 can be suppressed. As a result, the reliability of the electric motor 20 can be improved. 【0034】 The routing end plate 70 is made of a material that has refrigerant resistance and oil resistance. This prevents deterioration of the routing end plate 70 due to the refrigerant environment of the compressor 1, and as a result, the reliability of the electric motor 20 and the compressor 1 can be further improved. 【0035】 This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure. [Explanation of Symbols] 【0036】 1... Compressor, 20... Motor for compressor, 30... Stator, 31... Stator core, 311... Teeth, 312... Slot, 60... Insulating end plate, 70... Routing end plate, 71... Holding part, 72... Hole, 80... Winding, 81... Coil

Claims

[Claim 1] A stator core having teeth around which the windings are wound, A coil formed by winding the aforementioned winding around the aforementioned teeth, The system includes a routing end plate provided on the axial end side of the stator core and having a holding portion for holding the windings extending from the coil, Electric motor for compressors. [Claim 2] The holding portion is provided in a position to cover at least one of the coils of each phase. The electric motor for a compressor according to claim 1. [Claim 3] The routing end plate is provided at a position corresponding to the slot between adjacent teeth and has a hole formed through the routing end plate. The electric motor for a compressor according to claim 1. [Claim 4] The holding portion is configured to hold the windings of different phases separately. The electric motor for a compressor according to claim 1. [Claim 5] The stator core is further provided with an insulating end plate, The aforementioned routing end plate is connected and fixed to the aforementioned insulating end plate. The electric motor for a compressor according to claim 1. [Claim 6] The aforementioned routing end plate is made of a material that has refrigerant resistance and oil resistance. The electric motor for a compressor according to claim 1.

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