JP2024040580A - Electric motor, and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an insulator, provided on both ends of a stator core, common, and enhance workability of a bundling step for bundling a plurality of neutral lines to connect them together.

SOLUTION: A first insulator and a second insulator included in an insulator in an electric motor is formed into the same shape. The insulator is formed with a plurality of crossover-wire holding slits through which each crossover wire is passed in a radial direction of the first insulator when the insulator is used as the first insulator, and a plurality of neutral-wire holding slits through which each neutral wire drawn out from a winding portion to an outer periphery of the second insulator is passed when the insulator is used as the second insulator. The plurality of neutral-wire holding slits are formed so that depths extending in the axial direction of the insulator are equal, and includes a neutral-wire dedicated holding slit. The neutral-wire dedicated holding slit is a neutral-wire holding slit dedicated to a neutral wire, through which the crossover wire is not passed when the insulator is used as the first insulator.

SELECTED DRAWING: Figure 8

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an electric motor and a compressor including the electric motor.

The stator of the electric motor includes a stator core having an annular yoke portion and a plurality of teeth portions protruding radially inward from the yoke portion, and an annular stator core disposed at both ends of the stator core in the axial direction of the rotating shaft connected to the rotor. An insulator is known that includes an insulator and a plurality of winding portions formed by winding a winding wire around each of a plurality of teeth portions.

In the stator of this type of electric motor, a plurality of windings are formed for each of the three phases (U phase, V phase, W phase), and a plurality of windings of the same phase in the three phases (for example, the U phase In some cases, a connecting wire connecting a plurality of winding portions is passed through a slit passing through the insulator in the radial direction, and is stretched along the circumferential direction of the outer circumferential surface of the insulator. In addition, as a stator, in the winding process in which a winding wire is wound around each tooth portion to form a winding portion, one nozzle that supplies the winding wire is used to form multiple winding portions that are in the same phase in three phases. In some cases, the winding portions are formed by a one-nozzle winding method in which each winding portion is sequentially formed for each phase.

In the patent document 1, in order to prevent contact between the crossover wires of different phases, the crossover wires of the same phase are hung at the same height in the axial direction of the rotating shaft, and the crossover wires of different phases are hung at different heights in the axial direction of the rotating shaft. This makes it possible to form the winding section using a one-nozzle winding method, making the insulator smaller in the axial direction of the rotating shaft and preventing the stator from becoming larger.

Further, in Patent Document 2, in a first insulator provided at one end of the stator core and a second insulator provided at the other end of the stator core, a connecting wire holding slit through which a connecting wire is passed is formed in the first insulator. A neutral wire holding slit through which the neutral wire extending from the winding portion is passed is formed in the second insulator, thereby improving the workability of drawing the winding wire. Further, by making the first insulator and the second insulator have the same shape, handling of the insulator is facilitated.

JP2017-163726A JP 2020-72579 Publication

As described above, when the first insulator and the second insulator are used in common, it is possible to divert some of the plurality of connecting wire holding slits in the first insulator as neutral wire holding slits in the second insulator. However, if you try to connect crossover wires of different phases so that their height positions in the axial direction of the rotating shaft are different from each other, the height at which each neutral wire is drawn out from each winding part in the circumferential direction of the second insulator Depending on the relationship between the position and the height position of each crossover wire holding slit, a plurality of crossover wire holding slits having mutually different depths in the axial direction of the rotating shaft are used as the neutral wire holding slit. At this time, in the second insulator, the depths of the neutral wire holding slits through which the plurality of neutral wires are passed are different from each other, so that the plurality of neutral wires drawn out to the outer periphery of the second insulator are bundled. There is a problem that the workability of the connecting binding process is reduced.

The disclosed technology has been made in view of the above, and can make the insulators provided at both ends of the stator core common, and can improve the workability of the bundling process of bundling and connecting a plurality of neutral wires. The purpose is to provide electric motors and compressors.

One aspect of the electric motor disclosed in the present application includes a rotor, a stator disposed on the outer peripheral side of the rotor, and a rotating shaft connected to the rotor, and the stator includes an annular yoke portion and a radial direction of the yoke portion. a stator core having a plurality of teeth protruding inward; an annular insulator disposed at both ends of the stator core in the axial direction of the rotating shaft; A plurality of crossover wires are connected in the circumferential direction of the insulator to connect the winding parts of the same phase in the three phases, and a plurality of crossover wires are connected at the neutral point extending from the winding parts of each phase. a plurality of neutral wires, the insulator includes a first insulator disposed at one end of the stator core in the axial direction, and a second insulator disposed at the other end of the stator core in the axial direction. , an electric motor in which a first insulator and a second insulator are formed in the same shape, and the insulator includes a plurality of connecting wires through which crossover wires are passed in the radial direction of the first insulator when the insulator is used as the first insulator. a crossover wire holding slit, and a plurality of neutral wire holding slits through which each neutral wire drawn out from the winding part to the outer periphery of the second insulator is passed when the insulator is used as a second insulator, The plurality of neutral line holding slits are formed to have equal depths extending in the axial direction of the insulator, and include a neutral line holding slit, and the neutral line holding slit is such that the insulator is used as a first insulator. This is a neutral wire holding slit for exclusive use of the neutral wire, through which no crossover wire is sometimes passed.

According to one aspect of the electric motor disclosed in the present application, the insulators provided at both ends of the stator core can be shared, and the workability of the bundling process of bundling and connecting a plurality of neutral wires can be improved.

FIG. 1 is a longitudinal cross-sectional view showing a compressor equipped with an electric motor according to a first embodiment. FIG. 2 is a bottom view showing the stator core in Example 1. FIG. 3 is a perspective view schematically showing the insulator in Example 1. FIG. 4 is a top view showing the stator in Example 1. FIG. 5 is a bottom view showing the stator in Example 1. FIG. 6 is a wiring diagram showing the wiring state of the winding portions of each phase in the first embodiment. FIG. 7 is a developed view for explaining the winding paths forming each winding part of the U phase in the first embodiment. FIG. 8 is a developed view for explaining the winding paths forming each winding portion of each phase in the first embodiment. FIG. 9 is a perspective view showing a splice terminal forming a neutral point in Example 1. FIG. 10 is a wiring diagram showing the wiring state of the winding portions of each phase in the second embodiment. FIG. 11 is a developed view for explaining the winding paths forming each winding portion of each phase in the second embodiment. FIG. 12 is a top view showing the stator in Example 3. FIG. 13 is a bottom view showing the stator in Example 3. FIG. 14 is a wiring diagram showing the connection state of the winding portions of each phase in Example 3. FIG. 15 is a developed view for explaining the routing route of the windings forming each winding portion of the U phase in the third embodiment. FIG. 16 is a developed view for explaining the winding paths forming each winding portion of each phase in Example 3.

Embodiments of the electric motor and compressor disclosed in the present application will be described in detail below based on the drawings. Note that the electric motor and compressor disclosed in the present application are not limited to the following examples.

FIG. 1 is a longitudinal cross-sectional view showing a compressor equipped with an electric motor according to a first embodiment. As shown in FIG. 1, the compressor 1 is a so-called rotary compressor, and includes a container 2, a rotating shaft 3, a compression section 5, and an electric motor 6. The container 2 is made of a metal material and has a sealed internal space 7. The internal space 7 is formed into a generally cylindrical shape. The container 2 is formed so that the central axis of the internal space 7 is parallel to the vertical direction when placed vertically on a horizontal surface. An oil reservoir 8 is formed in the container 2 at the bottom of an internal space 7. The oil reservoir 8 stores lubricating oil that lubricates the compression section 5 . A suction pipe 11 for sucking refrigerant and a discharge pipe 12 for discharging compressed refrigerant are connected to the container 2. The rotating shaft 3 is provided along the vertical direction, and is arranged in the internal space 7 of the container 2 so that one end is immersed in the oil reservoir 8. The rotating shaft 3 is supported by the container 2 so as to be rotatable around the central axis of the internal space 7 . The rotating shaft 3 supplies lubricating oil stored in the oil reservoir 8 to the compression section 5 by rotating.

The compression part 5 is arranged at the lower part of the internal space 7 and above the oil reservoir 8. The compressor 1 further includes an upper muffler cover 14 and a lower muffler cover 15. The upper muffler cover 14 is arranged above the compression section 5 in the internal space 7. The upper muffler cover 14 forms an upper muffler chamber 16 therein. The lower muffler cover 15 is provided below the compression section 5 in the internal space 7 and above the oil reservoir 8 . A lower muffler chamber 17 is formed inside the lower muffler cover 15. The lower muffler chamber 17 communicates with the upper muffler chamber 16 via a communication passage (not shown) formed in the compression section 5. A discharge hole 18 for discharging compressed refrigerant is formed between the upper muffler cover 14 and the rotating shaft 3, and the upper muffler chamber 16 communicates with the internal space 7 via the discharge hole 18.

The compression unit 5 compresses the refrigerant supplied from the suction pipe 11 by rotating the rotating shaft 3 driven by the electric motor 6, and supplies the compressed refrigerant to the upper muffler chamber 16 and the lower muffler chamber 17. do. The refrigerant is compatible with the lubricating oil.

The electric motor 6 is arranged above the compression section 5 in the internal space 7 . The electric motor 6 is a three-phase electric motor and includes a rotor 21 and a stator 22. The rotor 21 is fixed to the rotating shaft 3. The stator 22 is formed in a generally cylindrical shape, is arranged on the outer peripheral side of the rotor 21 so as to surround the rotor 21, and is fixed to the container 2. The stator 22 includes a stator core 23, a lower insulator 25B as a first insulator, an upper insulator 25A as a second insulator, and a plurality of windings 46.

The upper insulator 25A is arranged at the upper end of the stator core 23 in the axial direction of the rotating shaft 3. The lower insulator 25B is arranged at the lower end of the stator core 23 in the axial direction of the rotating shaft 3. The upper insulator 25A and the lower insulator 25B are examples of insulating parts that insulate the stator core 23 and the winding 46. The upper insulator 25A and the lower insulator 25B in this embodiment are formed in the same shape, and are used as the upper insulator 25A when provided at the upper end of the stator core 23, and are used as the upper insulator 25A when provided at the lower end of the stator core 23. It is used as an insulator 25B. Hereinafter, in the embodiment, the upper insulator 25A and the lower insulator 25B are collectively referred to as the insulator 25.

FIG. 2 is a bottom view showing the stator core 23 in the first embodiment. The stator core 23 is formed by laminating a plurality of metal plates made of a soft magnetic material such as a silicon steel plate, and includes a yoke portion 31 and a plurality of stator core teeth portions 32-1 as shown in FIG. It is equipped with ~32-9. The yoke portion 31 is generally formed in an annular (cylindrical) shape. The first stator core teeth portion 32-1 of the plurality of stator core teeth portions 32-1 to 32-9 is formed into a generally columnar shape extending in the radial direction of the stator core 23. The first stator core teeth portion 32-1 is formed such that one end thereof is connected to the inner circumferential surface of the yoke portion 31, that is, it is formed so as to protrude from the inner circumferential surface of the yoke portion 31 inward in the radial direction of the yoke portion 31. There is. Among the plurality of stator core teeth parts 32-1 to 32-9, the stator core teeth parts 32-2 to 32-9, which are different from the first stator core teeth part 32-1, are generally similar to the first stator core teeth part 32-1. It is formed in a columnar shape and protrudes from the inner circumferential surface of the yoke portion 31 . In the case of a 9-slot stator 22, the plurality of stator core teeth parts 32-1 to 32-9 are arranged on the inner peripheral surface of the yoke part 31 at equal intervals of 40 degrees with respect to the circumferential direction of the yoke part 31. It is formed like this.

FIG. 3 is a perspective view schematically showing the insulator 25 in Example 1. As shown in FIG. 3, the insulator 25 (upper insulator 25A and lower insulator 25B) is formed into an annular shape using an insulator such as polybutylene terephthalate resin (PBT). As shown in FIG. 3, the insulator 25 includes an outer peripheral wall portion 41, a plurality of insulator teeth portions 42-1 to 42-9 around which a winding wire (conductor wire) 46 is wound, and a plurality of collar portions 43-1 to 42-9. 43-9. The outer peripheral wall portion 41 is formed into a generally cylindrical shape. The outer peripheral wall 41 has a plurality of slits 44 extending along the central axis of the outer peripheral wall 41 from one end in the direction along the central axis of the outer peripheral wall 41 (the axial direction of the rotating shaft 3). They are formed at intervals in the circumferential direction. Further, the other end of the outer peripheral wall portion 41 in the direction along the central axis of the outer peripheral wall portion 41 is in contact with the stator core 23 . In other words, the plurality of slits 44 are formed extending from one end of the outer peripheral wall portion 41 on the side opposite to the stator core 23 toward the stator core 23 side. The winding wire 46 pulled out from the winding portion 45 (described later) is passed through each slit 44, so that the winding wire 46 pulled out from the inner peripheral side of the outer peripheral wall portion 41 to the outer peripheral side of the outer peripheral wall portion 41 is A crossover wire 49 extending along the surface is formed. In the insulator 25 shown in FIG. 3, the shape and arrangement of each slit 44 in the outer peripheral wall portion 41 are schematically shown, and the details of the shape and arrangement of each slit 44 will be described later.

The first insulator tooth portion 42-1 of the plurality of insulator teeth portions 42-1 to 42-9 is formed into a straight column shape with a generally semicircular cross section. The first insulator teeth 42 - 1 are formed such that one end thereof is continuous with the inner circumferential surface of the outer circumferential wall 41 , that is, it is formed to protrude from the inner circumferential surface of the outer circumferential wall 41 . Among the plurality of insulator teeth parts 42-1 to 42-9, the insulator teeth parts 42-2 to 42-9, which are different from the first insulator teeth part 42-1, are also straight like the first insulator teeth part 42-1. It is formed in a columnar shape and is formed to protrude from the inner circumferential surface of the outer circumferential wall portion 41 . The plurality of insulator teeth portions 42-1 to 42-9 are formed on the inner circumferential surface of the outer circumferential wall portion 41 at equal intervals of 40 degrees with respect to the circumferential direction of the outer circumferential wall portion 41.

The plurality of flange portions 43-1 to 43-9 correspond to the plurality of insulator teeth portions 42-1 to 42-9, and are each formed into a generally semicircular plate shape. Among the plurality of collar parts 43-1 to 43-9, the first collar part 43-1 corresponding to the first insulator tooth part 42-1 has a first collar part 43-1 that is continuous with the other end of the first insulator tooth part 42-1. 1 is formed integrally with the insulator teeth portion 42-1. Among the plurality of flange portions 43-1 to 43-9, the flange portions different from the first flange portion 43-1 also include the plurality of insulator teeth portions 42-1 to 42-9, similar to the first flange portion 43-1. It is formed continuously from the other end and integrally with each of the insulator teeth portions 42-1 to 42-9.

FIG. 4 is a top view showing the stator 22 in Example 1, and is a view of the stator 22 viewed from the upper insulator 25A side. FIG. 5 is a bottom view showing the stator 22 in Example 1, and is a view of the stator 22 viewed from the lower insulator 25B side. As shown in FIGS. 4 and 5, each of the stator core teeth portions 32-1 to 32-9 of the stator core 23 includes a plurality of windings 46 (U-phase windings 46-U1 to 46-U3, which will be described later). V-phase windings 46-V1 to 46-V3 and W-phase windings 46-W1 to 46-W3) are wound thereon. As shown in FIG. 5, which will be described later, each of the stator core teeth parts 32-1 to 32-9 has a winding part 45 formed of a winding wire 46 of each phase. Each of the winding portions 45 forming nine slots is labeled with a number 1 to 9 in the counterclockwise order in FIG. 4, and is labeled 1 to 9 in the clockwise order in FIG. show. The nine winding parts 45 are arranged along the circumferential direction of the stator core 23 so that the three phases repeat the same order. That is, they are arranged so that the U-phase, V-phase, and W-phase are repeated in the counterclockwise order of FIG. 4 and the clockwise order of FIG. 5.

The electric motor 6 in the first embodiment is a concentrated winding electric motor with six poles and nine slots. The plurality of windings (conductor wires) 46 include a plurality of U-phase windings 46-U1 to 46-U3 forming a U-phase winding portion 45, and a plurality of V-phase windings 46-U1 to 46-U3 forming a V-phase winding portion 45. The windings 46-V1 to 46-V3 and a plurality of W-phase windings 46-W1 to 46-W3 forming the W-phase winding portion 45 are included.

Note that the electric motor of the present invention is not limited to nine slots, and the number of slots, that is, the number of winding parts 45 (or the number of stator core teeth parts 32) is 12 or more and a multiple of 3. There may be. In other words, the number of insulator teeth portions 42 of the insulator 25 may be 9 or more and a multiple of 3.

(Connection structure of 3-phase winding part)
FIG. 6 is a wiring diagram showing the wiring state of the winding portions 45 of each phase in the first embodiment. In FIG. 6, each winding portion 45 formed by winding a winding wire 46 around each of the nine stator core teeth portions 32-1 to 32-9 includes FIGS. 4, 5, and 7, which will be described later. The numbers [1] to [9] corresponding to those in FIG. 8 are attached.

As shown in FIG. 6, the winding portions 45 of the U-phase, V-phase, and W-phase in the electric motor 6 of the first embodiment include a series connection portion 52 in which three winding portions 45 are connected in series. A three-phase series connection section 52 is electrically connected at a neutral point 51. A U-phase neutral wire 47-U, a V-phase neutral wire 47-V, and a W-phase neutral wire 47-W as the neutral wire 47 are electrically connected to the neutral point 51, respectively. Further, as shown in FIG. 4, a binding wire 50 in which three neutral wires 47 are bundled and connected is inserted into the gap G between the winding parts 45 and held. Note that the neutral wire 47 is formed by a part of the winding wire 46.

The electric motor 6 of Example 1 has a star connection body 53 having nine winding parts 45. The star connection body 53 includes a series connection section 52 consisting of a first winding section [1], a fourth winding section [4], and a seventh winding section [7], a second winding section [2], and a second winding section [2]. A series connection part 52 consisting of a fifth winding part [5], an eighth winding part [8], a third winding part [3], a sixth winding part [6], and a ninth winding part [9]. A U-phase neutral wire 47-U, a V-phase neutral wire 47-V, and a W-phase neutral wire 47-W, which will be described later, are They are electrically connected to each other.

FIG. 7 is a developed view for explaining the winding route of the windings 46 forming each winding portion 45 of the U phase in the first embodiment. FIG. 8 is a developed view for explaining the winding paths of the windings 46 forming each winding portion 45 of each phase in the first embodiment. 7 and 8, each winding part 45 forming the series connection part 52 of each phase is connected from the inner peripheral side of the yoke part 31 in the radial direction of the yoke part 31 (outer peripheral wall part 41 of the insulator 25). FIG. In FIGS. 7 and 8, a portion of the connecting wire 49 that is hidden behind the outer circumferential side of the lower insulator 25B when viewed from the inner circumferential side of the lower insulator 25B, which will be described later, is represented by a dotted line. On the other hand, when viewed from the inner circumferential side of the lower insulator 25B, the portion of the connecting wire 49 that is not hidden behind the outer circumferential side of the lower insulator 25B (the portion of the connecting wire 49 that is visible through the connecting wire holding slit 44A) is represented by a solid line. has been done. As shown in FIGS. 7 and 8, the winding portion 45 of each phase is formed by winding a winding wire (conductor wire) 46 counterclockwise (CCW: Counter Clock Wise).

(Characteristic structure of electric motor)
Next, the characteristic structure of the electric motor 6 of this embodiment will be explained. Features of this embodiment include the structure of a plurality of slits 44 formed in the outer peripheral wall portion 41 of the insulator 25. In the insulator 25, the uses of the plurality of slits 44 are different depending on whether the insulator 25 is used as an upper insulator 25A or the lower insulator 25B.

In addition, in the manufacturing process of the electric motor 6 in Example 1, the winding 46 is supplied from the nozzle to the stator core teeth portions 32-1 to 32-9 of the stator core 23 and the insulator teeth portions 42-1 to 42- of the lower insulator 25B. A winding machine (not shown) is used that winds the winding wire 46 across the lower insulator 25B and the winding wire 46 along the outer circumferential wall portion 41 of the lower insulator 25B. In the first embodiment, when forming each winding part 45 of three phases using a winding machine, one nozzle is used to form the winding part 45 for each phase, and the winding part 45 of each phase is sequentially formed. A so-called one-nozzle winding method is applied, in which the three-phase winding portion 45 is formed. The features of this embodiment include the shape of the insulator 25 on the premise that the winding portions 45 of each phase are formed using a one-nozzle winding method. First, the characteristics of the slits 44 of the insulator 25 will be described, and details of the winding paths of the windings 46 forming the winding portions 45 of each phase will be described later.

The insulator 25 has a plurality of connecting wire holding slits 44A through which each connecting wire 49 is passed in the radial direction of the lower insulator 25B when the insulator 25 is used as the lower insulator 25B, and a plurality of connecting wire holding slits 44A through which each connecting wire 49 is passed in the radial direction of the lower insulator 25B when the insulator 25 is used as the upper insulator 25A. A plurality of neutral wire holding slits 44B are formed in which each neutral wire 47 drawn out from the winding portion 45 to the outer periphery of the upper insulator 25A is passed.

That is, the plurality of slits 44 in the outer peripheral wall portion 41 of the insulator 25 include a plurality of crossover wire holding slits 44A and a plurality of neutral wire holding slits 44B. The plurality of crossover wire holding slits 44A hold the crossover wires 49 of different phases at different height positions in the axial direction of the lower insulator 25AB (the axial direction of the rotating shaft 3) when the insulator 25 is used as the lower insulator 25B. At the same time, the crossover wires 49 of the same phase are held at the same height position in the axial direction of the lower insulator 25B.

In other words, among the plurality of connecting wire holding slits 44A, the connecting wire holding slits 44A, through which the connecting wires 49 of different phases are passed, have a depth extending in the axial direction of the insulator 25 (the axial direction of the rotating shaft 3). , depth) are different, and the connecting wire holding slits 44A through which the connecting wires 49 of the same phase are passed have the same depth. Therefore, for example, when each winding part 45 is formed in the order of U phase, V phase, and W phase by the one nozzle winding method as in this embodiment, the depth of the slit 44 is They are made smaller in order of phase. Therefore, the connecting wires 49 of different phases extend in parallel with each other at intervals along the circumferential direction of the outer peripheral wall 41 of the lower insulator 25B, and the insulation distance between the connecting wires 49 of each phase is appropriate. is secured. Further, by holding the crossover wires 49 of the same phase at the same height position in the axial direction of the lower insulator 25B, the crossover wires 49 of the same phase are stretched over the outer peripheral wall portion 41 at an angle with respect to the circumferential direction. Compared to the above structure, the outer peripheral wall portion 41 is prevented from increasing in size in the axial direction of the insulator 25, and the insulator 25 can be prevented from increasing in size. In addition, in the embodiment, the symbols such as "A" and "B" in the crossover wire holding slit 44A and the neutral wire holding slit 44B are used to distinguish the function (role) of each slit 44, and the depth of the slit 44 is It does not differentiate between

The plurality of neutral line holding slits 44B are formed to have the same depth and include a neutral line exclusive holding slit 44B1. Here, among the plurality of neutral wire holding slits 44B, the neutral wire holding slit 44B1 is a neutral wire holding slit dedicated to the neutral wire through which the crossover wire 49 is not passed when the insulator 25 is used as the upper insulator 25A. This is the slit 44B. By forming the plurality of neutral wire holding slits 44B with the same depth in this way, three neutral wires 47 (U-phase neutral wire 47-U, V-phase neutral wire 47-U, V-phase neutral wire 47-U, Since the height positions at which the neutral wires 47-V and W-phase neutral wires 47-W are pulled out to the outer circumferential side of the upper insulator 25A are aligned, twist the three neutral wires 47 together at one place. The binding process of fixing the cables to the outer peripheral wall 41 and bundling them into one can be performed smoothly, and the workability of the wiring process can be improved. Note that the depths of the neutral line holding slits 44B only need to be formed to be approximately equal. For example, even if there is a difference of about 1 to 2 [mm] in depth, the depths are equal in the embodiment. , and the same effects as in the example can be obtained.

The plurality of neutral wire holding slits 44B include a dual-purpose holding slit 44B2, and the dual-purpose holding slit 44B2 also serves as the crossover wire holding slit 44A when the insulator 25 is used as the lower insulator 25B. That is, the dual-purpose holding slit 44B2 is a slit 44 through which the crossover wire 49 is passed when the insulator 25 is used as the lower insulator 25B, and through which the neutral wire 47 is passed when the insulator 25 is used as the upper insulator 25A. be.

Furthermore, as shown in FIGS. 7 and 8, each of the plurality of neutral wire holding slits 44B is connected to the winding 44 of each phase in the circumferential direction of the lower insulator 25B when the insulator 25 is used as the lower insulator 25B. The crossover wire extends from the first winding part 45 where winding begins, that is, the first winding part [1] of the U phase, the second winding part [2] of the V phase, and the third winding part [3] of the W phase. 49 are respectively arranged between the connecting wire holding slits 44A through which the wires are passed.

A binding wire holding slit 44C is formed in the insulator 25, and when the insulator 25 is used as the upper insulator 25A, the binding wire 50, which is formed by bundling and connecting a plurality of neutral wires 47, is formed in the insulator 25. This is a slit 44 that passes from the outer circumference to the inner circumference of the upper insulator 25A. Moreover, the binding wire holding slit 44C also serves as the crossover wire holding slit 44A when the insulator 25 is used as the lower insulator 25B.

That is, the binding wire holding slit 44C is a slit 44 through which the crossover wire 49 is passed when the insulator 25 is used as the lower insulator 25B, and through which the binding wire 50 is passed when the insulator 25 is used as the upper insulator 25A. be. Note that the binding wire holding slit 44C may be a holding slit dedicated to the binding wire, but by also serving as the connecting wire holding slit 44A, the number of the plurality of slits 44 formed in the outer peripheral wall portion 41 can be reduced, and the outer peripheral A decrease in the mechanical strength of the wall portion 41 can be suppressed.

Therefore, in the first embodiment, the remaining connecting wire holding slits 44A excluding the dual-purpose holding slit 44B2 and the binding wire holding slit 44C included in the plurality of connecting wire holding slits 44A are as follows. This is a crossover wire holding slit 44D exclusively used for crossover wires.

As shown in FIG. 8, each of the first winding parts 45 that start winding the three-phase winding 46, that is, the first winding part [1] of the U phase, the second winding part [2] of the V phase, The third winding portion [3] of the W phase is continuously arranged adjacent to each other in the circumferential direction of the insulator 25 (the circumferential direction of the stator core 23), and is arranged at an angle of 40 degrees with respect to the circumferential direction of the insulator 25. It is placed open. In addition, each of the last winding part 45 (winding end winding part) where the three-phase winding 46 is wound, that is, the seventh winding part [7] of the U phase, the eighth winding part [8] of the V phase, ], the W-phase ninth winding portions [9] are continuously arranged adjacent to each other in the circumferential direction of the insulator 25, and the center angles with respect to the circumferential direction of the insulator 25 are arranged at intervals of 40 degrees.

The winding 46 of each phase includes a first winding part 45, a second winding part 45, a third winding part 45, and a third winding part 45, which are arranged in order along the circumferential direction of the insulator 25. A first crossover wire connecting the first winding portion 45 and the second winding portion 45 (first U-phase crossover wire 49-U1, first V-phase crossover wire 49-V1, first W-phase crossover wire 49-W1) ), and second crossover wires (second U phase crossover wire 49-U2, second V phase crossover wire 49-V2, second W phase crossover wire) connecting the second winding part 45 and third winding part 45. 49-W2.In addition, in the description of the first winding part 45, the second winding part 45, and the third winding part 45 in a certain phase, "first", " The terms "second" and "third" refer to the order in which the winding parts 45 of the same phase are lined up along the circumferential direction of the insulator 25, and the first winding part [1] lined up in the circumferential direction of the insulator 25. - does not refer to the third winding part [3]. The first winding part 45 is the first winding part 45 where the above-mentioned winding wire 46 starts to be wound, and the third winding part [3] in Example 1 is the first winding part 45. The winding part 45 is the last winding part 45 that finishes winding the winding wire 46 described above.In other words, the first winding part [1] of the U phase shown in FIG. The fourth winding part [4] is the second winding part 45 in the U phase, and the seventh winding part [7] is the third winding part 45 in the U phase. Similarly, the second winding part [2], the fifth winding part [5], and the eighth winding part [8] of the V phase shown in FIG. 45, the second winding part 45, and the third winding part 45.Similarly, the third winding part [3] and the sixth winding part [6] of the W phase shown in FIG. , the ninth winding part [9] is the first winding part 45, the second winding part 45, and the third winding part 45 in the W phase.

As shown in FIGS. 7 and 8, each of the plurality of neutral wire holding slits 44B is connected to the first connecting wire of each phase in the circumferential direction of the lower insulator 25B when the insulator 25 is used as the lower insulator 25B. The first U-phase connecting wire 49-U1, the first V-phase connecting wire 49-V1, and the first W-phase connecting wire 49-W are located between the connecting wire holding slits 44A drawn out from the inner circumference to the outer circumference of the lower insulator 25B, respectively. It is located. In other words, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the first U-phase winding 46-U1 extended from the first winding part [1] to form the first U-phase crossover wire 49-U1. The connecting wire holding slit 44A is passed through to form a first V-phase connecting wire 49-V1, and the first V-phase winding 46-V1 extended from the second winding part [2] is passed through the connecting wire holding slit 44A to form a first V-phase connecting wire 49-V1. The connecting wire holding slit 44A is arranged between the connecting wire holding slit 44A and the connecting wire holding slit 44A. Therefore, the first U-phase winding 46-U1 passes through the connecting wire holding slit 44A to form the first U-phase connecting wire 49-U1, and the first V-phase winding 46-V1 passes through the connecting wire holding slit 44A to form the first V-phase connecting wire 49-U1. The crossover wire holding slits 44A, which are passed through to form V1, are arranged on both sides of the neutral wire holding slit 44B in the circumferential direction of the lower insulator 25B.

Similarly, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the first V-phase winding 46-V1 extended from the second winding part [2] to form the first V-phase connecting wire 49-V1. The first W-phase winding 46-W1 extending from the third winding part [3] is passed through the connecting wire holding slit 44A to form a first W-phase connecting wire 49-W1. The connecting wire holding slit 44A is arranged between the connecting wire holding slit 44A and the connecting wire holding slit 44A. Therefore, the first V-phase winding 46-V1 passes through the connecting wire holding slit 44A to form the first V-phase connecting wire 49-V1, and the first W-phase winding 46-W1 passes through the connecting wire holding slit 44A to form the first W-phase connecting wire 49-V1. The crossover wire holding slits 44A that are passed through to form -W1 are arranged on both sides of the neutral wire holding slit 44B in the circumferential direction of the lower insulator 25B.

In the insulator 25, the neutral wire holding slits 44B (neutral wire exclusive holding slits 44B1) are arranged in, for example, the winding part [4], the winding part [5], which is the range where the crossover wire holding slits 44A are arranged closely. Avoiding the area near the winding part [6], the winding part [1], the winding part [2], and the winding part [3] are areas where the crossover wire holding slits 44A are arranged relatively sparsely. By forming the neutral line holding slit 44B in the vicinity, a decrease in the mechanical strength of the outer peripheral wall 41 due to the formation of the neutral line holding slit 44B can be suppressed. In Embodiment 1, the neutral line holding slit 44B (neutral line exclusive holding slit 44B1) starts winding the winding wire 46 of each phase in a range where the crossover line holding slit 44A is relatively sparsely arranged. The winding start winding part which is the first winding part 45 (the first winding part [1] of the U phase in Example 1, the second winding part [2] of the V phase, the third winding part of the W phase [3]) Instead of the nearby range, the winding end winding part which is the last winding part 45 where the winding wire 46 of each phase is wound (the seventh winding part [7] of the U phase in Example 1, It may be formed in a range near the eighth winding part [8] of the V phase and the ninth winding part [9] of the W phase.

Further, in the lower insulator 25B of Example 1, as shown in FIG. A connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 extending to the winding section [4]) is passed, and a connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 extending from the second U-phase winding 46-U2 (fourth winding section [4]) to the third U Among the crossover wire holding slits 44A through which one end of the 2nd U phase crossover wire 49-U2 extending to the phase winding 46-U3 (seventh winding section [7]) is passed (that is, the fourth winding section in FIG. Of the two crossover wire holding slits 44A formed near the paper surface of section [4], one of the crossover wire holding slits 44A doubles as the neutral wire holding slit 44B in the upper insulator 25A, and the other crossover The wire holding slit 44A also serves as a binding wire holding slit 44C through which a binding wire 50, which is a bundle of a plurality of neutral wires 47 connected together, is passed from the outer periphery to the inner periphery of the upper insulator 25A. In other words, from the first winding portion 45 (for example, the first U-phase winding 46-U1) of one phase (for example, U phase) of the three phases to the second winding portion 45 (for example, the second U-phase winding A connecting wire holding slit 44A through which one end of the first connecting wire 49 (for example, the first U-phase connecting wire 49-U1) extending to the wire 46-U2 is passed, and a second winding of this one phase (for example, U phase). A second connecting wire 49 (for example, a second U-phase connecting wire 49-U3) extends from the winding section 45 (for example, the second U-phase winding 46-U2) to the third winding section 45 (for example, the third U-phase winding 46-U3). Among the connecting wire holding slits 44A through which one end of U2) is passed (for example, among the two connecting wire holding slits 44A formed near the fourth winding part [4] in the vicinity of the paper surface in FIG. 7), one of the connecting wire holding slits 44A through which one end of In the upper insulator 25A, the wire holding slit 44A (for example, the connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 is passed) also serves as the neutral wire holding slit 44B, and the other connecting wire holding slit 44A ( For example, in the upper insulator 25A, a connecting wire holding slit 44A) through which one end of the second U-phase connecting wire 49-U2 is passed is inserted into the upper insulator 25A from the outer periphery of the upper insulator 25A. It also serves as a binding wire holding slit 44C that is passed around the circumference. In addition, as mentioned above, in the description of the first winding part 45, the second winding part 45, and the third winding part 45, "first", "second", and "first winding part 45" are used. "Third" refers to "the order in which the winding portions 45 of the same phase (U phase) are lined up along the circumferential direction of the insulator 25". That is, the "second winding part 45" refers to "the second winding part (second U-phase winding) among the winding parts 45 of the same phase (U phase) arranged along the circumferential direction of the insulator 25. 46-U2).

This makes it possible to arrange the neutral wire holding slit 44B and the binding wire holding slit 44C close to each other in the circumferential direction of the upper insulator 25A, facilitating the work of binding three neutral wires 47 into one. can. In addition, in the above-mentioned two connecting wire holding slits 44A, the connecting wire holding slit 44A that also serves as the neutral wire holding slit 44B and the connecting wire holding slit 44A that also serves as the binding wire holding slit 44C may be used interchangeably. The same effects as in the first embodiment can be obtained. For example, the connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 is passed is passed through the connecting wire holding slit 44A, through which the binding wire 50 connecting the plurality of neutral wires 47 is passed from the outer periphery to the inner periphery of the upper insulator 25A. The connecting wire holding slit 44A, which also serves as the binding wire holding slit 44C and through which one end of the second U-phase connecting wire 49-U2 is passed, may also serve as the neutral wire holding slit 44B in the upper insulator 25A.

(Windling route in the lower insulator)
The lower side of the paper in FIGS. 7 and 8 is the lead side where the power wire (lead wire) connected to the winding 46 is arranged, and is the upper insulator 25A side. The upper side of the paper in FIGS. 7 and 8 is the anti-lead side that is opposite to the lead side, and is the lower insulator 25B side. In addition, in FIGS. 7 and 8, each of the winding portions 45 forming nine slots is arranged in the following order in the circumferential direction of the yoke portion 31 of the stator core 23, that is, in the order from the left end to the right end in the figure. The first winding part to the ninth winding part are indicated by numbers [1] to [9]. The starting end S of the winding 46 connected to a power source (not shown) disposed outside the compressor 1 is indicated by a circle, and the terminal end E of the winding 46 is indicated by a triangular mark. Here, the starting end S and the ending end E are names based on the direction in which the current flows, and the current flows from the starting end S to the ending end E.

The connection structure of the winding portions 45 of the first embodiment is such that the winding portions 45 of each phase are lined up in the arrangement direction so that the winding portions 45 of each phase are lined up repeatedly in the order of U phase, V phase, and W phase in the circumferential direction of the stator core 23. When focusing only on the plurality of winding parts 45 of the same phase, adjacent winding parts 45 of the same phase among the plurality of winding parts 45 of the same phase are connected to each other. For example, as shown in FIG. 7, the U-phase winding 46-U includes a first U-phase winding 46-U1 (first winding part [1]) wound around the first stator core teeth part 32-1, The second U-phase winding 46-U2 (fourth winding part [4]) wound around the fourth stator core teeth part 32-4 is connected, and the second U-phase winding 46-U2 (fourth winding part [4]) is connected to the fourth stator core teeth part 32-4. part [4]) and the third U-phase winding 46-U3 (seventh winding part [7]) wound around the seventh stator core teeth part 32-7.

As shown in FIG. 7, the first U-phase winding 46-U1 extending from the starting end S of the U-phase power supply line 48-U connected to the U-phase power supply is counterclockwise connected to the first stator core teeth portion 32-1. (CCW) to form the first winding part [1]. The first U-phase winding 46-U1 extended from the first winding part [1] is passed from the inner peripheral side of the outer peripheral wall part 41 of the lower insulator 25B to the connecting wire holding slit 44A (hereinafter also simply referred to as slit 44). ) and extends along the outer periphery of the outer peripheral wall portion 41 to form a first U-phase crossover wire 49-U1. Here, the crossover wire 49 refers to a portion drawn out to the outer peripheral side of the lower insulator 25B through the crossover wire holding slit 44A and spanned along the outer peripheral wall portion 41. The second U-phase winding 46-U2, which is drawn from the first U-phase crossover wire 49-U1 to the inner circumferential side of the outer peripheral wall 41 through the crossover wire holding slit 44A, is directed against the fourth stator core teeth portion 32-4. It is wound clockwise (CCW) to form a fourth winding part [4].

The second U-phase winding 46-U2 stretched from the fourth winding part [4] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. , and forms a second U-phase crossover wire 49-U2. The third U-phase winding 46-U3, which is drawn from the second U-phase crossover wire 49-U2 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall portion 41, is directed against the seventh stator core teeth portion 32-7. It is wound clockwise (CCW) to form a seventh winding part [7]. The U-phase neutral wire 47-U extended from the seventh winding part [7] is extended to the terminal end E connected to the neutral point 51.

Here, in the lower insulator 25B, the connecting wire holding slit 44A through which one end of the 2nd U-phase connecting wire 49-U2 extending to the fourth winding part [4] passes, is in the seventh winding part [7] in the upper insulator 25A. It is also used as a neutral wire holding slit 44B through which the U-phase neutral wire 47-U extended from the 2nd U-phase connecting wire 49-U2 and U-phase neutral wire 47-U is held. This is the holding slit 44B2. In addition, in the lower insulator 25B, the connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 extending to the fourth winding part [4] passes, and in the upper insulator 25A, the U-phase neutral wire 47-U, It is also used as a binding wire holding slit 44C through which a binding wire 50 that bundles and electrically connects the V-phase neutral wire 47-V and the W-phase neutral wire 47-W is passed, and the first U-phase crossover wire 49-U1. It also serves to hold the binding wire 50.

In this way, the U-phase winding 46 is passed from the first stator core teeth part 32-1 to the fourth stator core teeth part 32-4 to the seventh stator core teeth part 32-7 in this order, so that each winding of the U phase A winding part 45 (a first winding part [1], a fourth winding part [4], and a seventh winding part [7]) is formed.

As shown in FIG. 8, the first V-phase winding 46-V1 extending from the starting end S of the V-phase power supply line 48-U connected to the V-phase power supply is counterclockwise connected to the second stator core teeth portion 32-2. (CCW) to form a second winding part [2]. The first V-phase winding 46-V1 extended from the second winding part [2] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. The first V-phase connecting wire 49-V1 is extended along the outer periphery of the first V-phase connecting wire 49-V1. The second V-phase winding 46-V2, which is drawn from the first V-phase crossover wire 49-V1 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall portion 41, is directed against the fifth stator core teeth portion 32-5. It is wound clockwise (CCW) to form a fifth winding part [5].

The second V-phase winding 46-V2 extended from the fifth winding part [5] passes from the inner peripheral side of the outer peripheral wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer peripheral wall 41. The V-phase connecting wire 49-V2 is extended along the outer periphery of the V-phase connecting wire 49-V2. The third V-phase winding 46-V3, which is drawn from the second V-phase crossover wire 49-V2 to the inner circumferential side of the outer peripheral wall portion 41 through the crossover wire holding slit 44A, is directed against the eighth stator core teeth portion 32-8. It is wound clockwise (CCW) to form the eighth winding part [8]. The V-phase neutral wire 47-V extended from the eighth winding part [8] is extended to the terminal end E connected to the neutral point 51.

In this way, the V-phase winding 46 is wound around the second stator core teeth section 32-2, the fifth stator core teeth section 32-5, and the eighth stator core teeth section 32-8 in this order. Each winding part 45 (second winding part [2], fifth winding part [5], and eighth winding part [8]) is formed.

As shown in FIG. 8, the first W-phase winding 46-W1 extending from the starting end S of the W-phase power supply line 48-W connected to the W-phase power supply is counterclockwise connected to the third stator core teeth portion 32-3. (CCW) to form the third winding part [3]. The first W-phase winding 46-W1 extended from the third winding part [3] of the third stator core teeth part 32-3 is inserted from the inner peripheral side of the outer peripheral wall part 41 of the lower insulator 25B to hold the crossover wire. It passes through the slit 44A and extends along the outer periphery of the outer peripheral wall portion 41, forming a first W-phase crossover wire 49-W1. The second W-phase winding 46-W2, which is drawn from the first W-phase crossover wire 49-W1 through the crossover wire holding slit 44A to the inner peripheral side of the outer peripheral wall portion 41, is directed against the sixth stator core teeth portion 32-6. It is wound clockwise (CCW) to form a sixth winding part [6].

The second W-phase winding 46-W2 extended from the sixth winding part [6] passes from the inner peripheral side of the outer peripheral wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer peripheral wall 41. , and forms a second W-phase crossover wire 49-W2. The third W-phase winding 46-W3, which is drawn from the second W-phase crossover wire 49-W2 to the inner circumferential side of the outer peripheral wall 41 through the crossover wire holding slit 44A, is directed against the ninth stator core teeth portion 32-9. It is wound clockwise (CCW) to form a ninth winding part [9]. The W-phase neutral wire 47-W extending from the ninth winding part [9] is extended to the terminal end E connected to the neutral point 51.

In this way, the W-phase winding 46 is passed from the third stator core teeth section 32-3, to the sixth stator core teeth section 32-6, to the ninth stator core teeth section 32-9 in this order, so that each winding of the W phase A winding part 45 (a third winding part [3], a sixth winding part [6], and a ninth winding part [9]) is formed.

(Neutral wire crossing route in the upper insulator)
When the insulator 25 used as the lower insulator 25B as described above is used as the upper insulator 25A, as shown in FIG. 8, the U-phase neutral wire 47- U is a neutral wire holding slit 44B, and is passed through a dual-purpose holding slit 44B2 which also functions as a crossover wire holding slit 44A when the insulator 25 is used as the lower insulator 25B. The U-phase neutral wire 47-U passed through the dual-purpose holding slit 44B2 is pulled out from the inner circumferential side to the outer circumferential side of the upper insulator 25A, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A.

Further, the V-phase neutral wire 47-V extended from the eighth winding part [8] is a neutral wire holding slit 44B, and is a crossover wire when the insulator 25 is used as the lower insulator 25B. When the upper insulator 25A is used without passing the neutral wire 49, only the neutral wire 47 is passed through the neutral wire exclusive holding slit 44B1.

Further, the W-phase neutral wire 47-W extended from the ninth winding part [9] is a neutral wire holding slit 44B, and is a crossover wire when the insulator 25 is used as the lower insulator 25B. 49 is not passed through and is used as the upper insulator 25B, only the neutral wire 47 is passed through the neutral wire exclusive holding slit 44B1.

Subsequently, in FIG. As shown by the auxiliary line represented by the two-dot chain line, the height positions of the upper insulators 25A with respect to the axial direction are aligned, so that the three The neutral wires 47 are twisted together at one place and fixed to the outer peripheral wall 41, and can be easily bundled into one wire. The three neutral wires 47 bundled into one are formed into one binding wire 50 by forming a neutral point 51 using a splice terminal 60, which will be described later.

As shown in FIG. 8, the thus formed binding wire 50 is passed from the outer peripheral side of the outer peripheral wall portion 41 of the upper insulator 25A through the binding wire holding slit 44C and drawn into the inner peripheral side of the upper insulator 25A. , is inserted and held in the gap G between the seventh winding part [7] and the eighth winding part [8] located near the binding wire holding slit 44C.

FIG. 9 is a perspective view showing a splice terminal forming the neutral point 51 in Example 1. As shown in FIG. 9, the end of the first U-phase neutral wire 47-U1, the end of the first V-phase neutral wire 47-V1, and the end of the first W-phase neutral wire 47-W1 are bundled together. For example, the neutral point 51 is formed by being sandwiched between the splice terminals 60 and electrically connected, and is formed as the binding wire 50. By using the splice terminal 60, the three neutral wires 47 can be easily connected. Further, the binding wire 50 is covered with an insulating tube (not shown).

(Effects of Example 1)
As described above, the insulator 25 of the electric motor 6 of the first embodiment has a plurality of connecting wire holding slits 44A through which each connecting wire 49 is passed when the insulator 25 is used as the lower insulator 25B, and the insulator 25 is used as the upper insulator 25A. A plurality of neutral line holding slits 44B are formed through which each neutral line 47 passes when used, and the plurality of neutral line holding slits 44B are arranged in the axial direction of the insulator 25 (the axial direction of the rotating shaft 3). They are formed to have the same extending depth and include a neutral line exclusive holding slit 44B1. The neutral line exclusive holding slit 44B1 is a neutral line holding slit 44B through which the crossover wire 49 is not passed when the insulator 25 is used as the lower insulator 25B. Thereby, the electric motor 6 can share the upper insulator 25A and the lower insulator 25B provided at both ends of the stator core 23, and improve the workability of the bundling process of bundling and electrically connecting the plurality of neutral wires 47. I can do it.

Furthermore, when the insulator 25 is used as the lower insulator 25B, the plurality of connecting wire holding slits 44A of the insulator 25 in Embodiment 1 allows connecting wires 49 of different phases to be connected in the axial direction of the lower insulator 25B (the axis of the rotating shaft 3). In addition, the connecting wires 49 of the same phase are held at the same position in the axial direction of the lower insulator 25B. Thereby, an appropriate insulation distance between crossover wires 49 of different phases can be ensured. Further, by holding the crossover wires 49 of the same phase at the same height position in the axial direction of the lower insulator 25B, the crossover wires 49 of the same phase are stretched over the outer peripheral wall portion 41 at an angle with respect to the circumferential direction. Compared to the above structure, the outer peripheral wall portion 41 is prevented from increasing in size in the axial direction of the insulator 25, and the insulator 25 can be prevented from increasing in size.

Further, the plurality of neutral wire holding slits 44B of the insulator 25 in Example 1 include a dual-purpose holding slit 44B2 that also serves as the crossover wire holding slit 44A when the insulator 25 is used as the lower insulator 25B. Thereby, the number of slits 44 formed in the outer peripheral wall 41 of the insulator 25 can be reduced, and a decrease in the mechanical strength of the outer peripheral wall 41 due to the formation of the neutral line holding slit 44B can be suppressed.

Further, in the insulator 25 in Example 1, when the insulator 25 is used as the upper insulator 25A, a binding wire 50 in which a plurality of neutral wires 47 are bundled and connected is passed from the outer periphery to the inner periphery of the upper insulator 25A. A binding wire holding slit 44C is formed. Thereby, the binding wire 50 can be held by the insulator 25.

Moreover, the binding wire holding slit 44C of the insulator 25 in Example 1 also serves as the crossover wire holding slit 44A when the insulator 25 is used as the lower insulator 25B. Thereby, the number of slits 44 formed in the outer peripheral wall 41 of the insulator 25 can be reduced, and a decrease in the mechanical strength of the outer peripheral wall 41 due to the formation of the binding wire holding slit 44C can be suppressed.

Further, each of the plurality of neutral wire holding slits 44B of the insulator 25 in Example 1 starts winding the winding wire 46 of each phase in the circumferential direction of the lower insulator 25B when the insulator 25 is used as the lower insulator 25B. The connecting wire holding slits 44A are respectively arranged between the connecting wire holding slits 44A through which the connecting wires 49 extending from the first winding portion 45 are passed. As a result, the neutral wire holding slit 44B avoids a range where the crossover wire holding slits 44A are arranged densely, and, for example, the winding start winding part where the arrangement of the crossover wire holding slits 44A is relatively sparse. (The winding part [1], the winding part [2], the winding part [3]) are formed in the vicinity of the winding part [1], the winding part [2], the winding part [3], thereby increasing the mechanical strength of the outer peripheral wall part 41 due to the formation of the neutral wire holding slit 44B. The decrease in

Further, in the insulator 25 of the electric motor 6 of the first embodiment, in the lower insulator 25B, for example, for the U phase which is one of the three phases, the first winding part of the U phase is 45. Extends from the phase winding 46-U1 (first winding part [1]) to the second U-phase winding 46-U2 (fourth winding part [4]), which is the second winding part 45 of the U phase. A crossover wire holding slit 44A through which one end of the first U-phase crossover wire 49-U1 is passed, and a second U-phase winding 46-U2 (fourth winding section [4 ]) to the third U-phase winding 46-U3 (seventh winding part [7]), which is the third winding part 45 of the U-phase, one end of the second U-phase crossover wire 49-U2 is passed through. One of the connecting wire holding slits 44A (in the first embodiment, the connecting wire holding slit 44A through which one end of the second U-phase connecting wire 49-U2 is passed) is a neutral wire holding slit 44A in the upper insulator 25A. The other connecting wire holding slit 44A (in the first embodiment, the connecting wire holding slit 44A through which one end of the first U-phase connecting wire 49-U1 is passed) serves as the wire holding slit 44B and bundles the plurality of neutral wires 47. The connected wire 50 also serves as a wire holding slit 44C through which the wire 50 is passed from the outer circumference to the inner circumference of the upper insulator 25A. This makes it possible to arrange the neutral wire holding slit 44B and the binding wire holding slit 44C close to each other in the circumferential direction of the upper insulator 25A, making it easier to bind three neutral wires into one. .

Further, according to the compressor 1 of the first embodiment, the workability of the process of manufacturing the electric motor 6 is improved, so that the manufacturing cost of the electric motor 6 can be reduced, and the manufacturing cost of the compressor 1 can also be reduced accordingly.

Other embodiments will be described below with reference to the drawings. In the other embodiments, the same constituent members as in the first embodiment are given the same reference numerals as in the first embodiment, and the explanation thereof will be omitted.

The electric motor 6 of the second embodiment includes the same insulators 25 (upper insulator 25A and lower insulator 25B) as in the first embodiment, and is a 6-pole, 9-slot concentrated winding type electric motor like the first embodiment. The second embodiment differs from the first embodiment in the connection state of the three-phase winding portion 45. FIG. 10 is a wiring diagram showing the wiring state of the winding portions 45 of each phase in the second embodiment. As shown in FIG. 10, the star connection body 53 of the second embodiment differs from the first embodiment in the order in which the winding portions 45 of the V phase are formed. 8], and the second winding part [2].

FIG. 11 is a developed view for explaining the winding paths of the windings 46 forming each winding portion 45 of each phase in the second embodiment. As shown in FIG. 11, in the second embodiment, each of the first winding parts 45 that start winding the three-phase winding 46, that is, the first U-phase winding 46 that is the first winding part 45 of the U-phase -U1 (first winding part [1]), first W phase winding 46-W1 (third winding part [3]) which is the first winding part 45 of W phase, first winding part of V phase The first V-phase winding 46-V1 (fifth winding part [5]), which is the fifth winding part 45, is connected to the other winding part 45 in the circumferential direction of the insulator 25 (the circumferential direction of the stator core 23). The center angles of the insulators 25 with respect to the circumferential direction are arranged at intervals of 80 degrees so as to sandwich (one winding part 45 that is not the "first winding part 45" of the U phase, V phase, and W phase) between them. has been done. Further, in the second embodiment, the winding 46 is wound in the order of the U phase, the W phase, and the V phase, which is different from the first embodiment in which the winding 46 is wound in the order of the U phase, the V phase, and the W phase. .

(Windling route in the lower insulator)
In the second embodiment, the winding paths of the U-phase and W-phase windings 46 in the lower insulator 25B are the same as in the first embodiment. Here, a route for passing the V-phase winding 46 in the lower insulator 25B will be described.

As shown in FIG. 11, the first V-phase winding 46-V1 extending from the starting end S of the V-phase power supply line 48-V connected to the V-phase power supply is counterclockwise connected to the fifth stator core teeth portion 32-5. (CCW) to form the fifth winding part [5]. The first V-phase winding 46-V1 extended from the fifth winding part [5] passes from the inner peripheral side of the outer peripheral wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer peripheral wall 41. The first V-phase connecting wire 49-V1 is extended along the outer periphery of the first V-phase connecting wire 49-V1. The second V-phase winding 46-V2, which is drawn from the first V-phase crossover wire 49-V1 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall 41, is directed against the eighth stator core teeth portion 32-8. It is wound clockwise (CCW) to form the eighth winding part [8].

The second V-phase winding 46-V2 extended from the eighth winding part [8] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. The V-phase connecting wire 49-V2 is extended along the outer periphery of the V-phase connecting wire 49-V2. The third V-phase winding 46-V3, which is drawn from the second V-phase crossover wire 49-V2 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall portion 41, is directed against the second stator core teeth portion 32-2. It is wound clockwise (CCW) to form a second winding part [2]. The V-phase neutral wire 47-V extended from the second winding part [2] is extended to the terminal end E connected to the neutral point 51.

In this way, the V-phase winding 46 is passed from the fifth stator core teeth section 32-5, to the eighth stator core teeth section 32-8, to the second stator core teeth section 32-2 in this order, and each winding section 45 is is forming.

(Neutral wire crossing route in the upper insulator)
When the insulator 25 used as the lower insulator 25B is used as the upper insulator 25A as described above, each of the crossing paths of the U-phase neutral wire 47-U and the W-phase neutral wire 47-W is It is similar to Here, a route for passing the V-phase neutral wire 47-V in the upper insulator 25A will be described.

As shown in FIG. 11, the V-phase neutral wire 47-V extended from the second winding part [2] is a neutral wire holding slit 44B, and the insulator 25 is used as a lower insulator 25B. When the neutral wire 47 is used as the upper insulator 25B without passing the crossover wire 49, only the neutral wire 47 is passed through the neutral wire exclusive holding slit 44B1.

Also in the second embodiment, the U-phase neutral wire 47-U, the V-phase neutral wire 47-V, and the W-phase neutral wire 47-W, which extend over the outer peripheral surface of the outer peripheral wall portion 41 of the upper insulator 25A, are as follows. Since the height positions of the upper insulators 25A with respect to the axial direction are aligned, they are spanned at the same height position along the circumferential direction of the outer peripheral wall portion 41, and the three neutral wires 47 are twisted together at one place. It is fixed to the outer peripheral wall part 41 and easily bundled into one. The three neutral wires 47 bundled into one are formed as one binding wire 50 by forming a neutral point 51 using the splice terminal 60. The binding wire 50 is passed through the binding wire holding slit 44C from the outer circumferential side of the outer peripheral wall portion 41 of the upper insulator 25A, and is drawn into the inner peripheral side of the upper insulator 25A. It is inserted and held in the gap G between the winding part [7] and the eighth winding part [8].

(Effects of Example 2)
As described above, the electric motor 6 of the second embodiment also has a plurality of crossover wire holding slits 44A when the insulator 25 is used as the lower insulator 25B, and a plurality of neutral wire holding slits when the insulator 25 is used as the upper insulator 25A. The slits 44B are formed in the insulator 25, and the plurality of neutral wire holding slits 44B are formed to have the same depth in the axial direction of the insulator 25 (the axial direction of the rotating shaft 3), and the insulator 25 is used as the lower insulator 25B. It includes a neutral line exclusive holding slit 44B1 when the neutral line is held. As a result, in the second embodiment, similarly to the first embodiment, the upper insulator 25A and the lower insulator 25B provided at both ends of the stator core 23 are made common, and a plurality of neutral wires 47 are bundled and electrically connected. The workability of the binding process can be improved.

The motor 6 of the third embodiment differs from the first and second embodiments in that it is a so-called 8-pole, 12-slot motor. FIG. 12 is a top view showing the stator 22 in Example 3. FIG. 3 is a diagram of the stator 22 viewed from the upper insulator 25A side. FIG. 13 is a bottom view showing the stator 22 in Example 3, and is a view of the stator 22 viewed from the lower insulator 25B side. As shown in FIGS. 12 and 13, a plurality of windings 46 are wound around the plurality of stator core teeth portions 32-1 to 32-12 of the stator core 23, respectively. As shown in FIG. 16, which will be described later, each stator core teeth portion 32-1 to 32-12 has a winding portion 45 formed of a winding wire 46 of each phase. Each of the winding portions 45 forming the 12 slots is labeled with a number 1 to 12 in the counterclockwise order in FIG. 12, and is labeled 1 to 12 in the clockwise order in FIG. show. The twelve winding parts 45 are arranged along the circumferential direction of the stator core 23 so that the three phases repeat the same order. That is, they are arranged so that the U phase, V phase, and W phase are repeated in the counterclockwise order of FIG. 12 and the clockwise order of FIG. 13.

The plurality of windings 46 in the third embodiment include a first U-phase winding 46-U1, a second U-phase winding 46-U2, a third U-phase winding 46-U3, and a third U-phase winding 46-U3, which form the U-phase winding portion 45. The 4U-phase winding 46-U4, the first V-phase winding 46-V1, the second V-phase winding 46-V2, the third V-phase winding 46-V3, and the fourth V-phase winding forming the V-phase winding portion 45. The wire 46-V4, the first W-phase winding 46-W1, the second W-phase winding 46-W2, the third W-phase winding 46-W3, and the fourth W-phase winding 46- that form the W-phase winding portion 45. W4 is included.

FIG. 14 is a wiring diagram showing the wiring state of the winding portions 45 of each phase in the third embodiment. In FIG. 14, each of the winding portions 45 forming 12 slots is labeled with [1] to [12] corresponding to FIGS. 12, 13, and FIGS. 15 and 16, which will be described later.

As shown in FIG. 14, the winding portions 45 of the U-phase, V-phase, and W-phase in the electric motor 6 of the third embodiment include a first series connection portion 52A in which two winding portions 45 are connected in series; It has a second series connection part 52B, in which the three-phase first series connection part 52A is electrically connected at the first neutral point 51A, and the three-phase second series connection part 52B is electrically connected to the second neutral point 51A. They are electrically connected at the sex point 51B.

A first U-phase neutral wire 47-U1, a first V-phase neutral wire 47-V1, and a first W-phase neutral wire 47-W1 as the neutral wire 47 are electrically connected to the first neutral point 51A. has been done. A second U-phase neutral wire 47-U2, a second V-phase neutral wire 47-V2, and a second W-phase neutral wire 47-W2 as the neutral wire 47 are electrically connected to the second neutral point 51B. has been done. In addition, as shown in FIG. 12, a first binding wire 50A in which three first neutral wires 47-U1, 47-V1, 47-W1 are bundled and connected, and three second neutral wires 50A are connected together. A second binding wire 50B, in which the wires 47-U2, 47-V2, and 47-W2 are bundled and connected, is inserted into the gap G between the winding portions 45 and held.

As shown in FIG. 14, the electric motor 6 of Example 3 has a first star connection body 53A and a second star connection body 53B. The first star connection body 53A includes a first series connection part 52A consisting of a first winding part [1] and a fourth winding part [4], an eleventh winding part [11] and a second winding part [ 2], and a first series connection part 52A consisting of a ninth winding part [9] and a twelfth winding part [12], and a first neutral point. A first U-phase neutral wire 47-U1, a first V-phase neutral wire 47-V1, and a first W-phase neutral wire 47-W1, which will be described later, are electrically connected via the wire 51A. The second star connection body 53B includes a second series connection section 52B consisting of a seventh winding section [7] and a tenth winding section [10], a fifth winding section [5], and an eighth winding section [5]. 8], and a second series connection part 52B consisting of a third winding part [3] and a sixth winding part [6], and a second neutral point. A second U-phase neutral wire 47-U2, a second V-phase neutral wire 47-V2, and a second W-phase neutral wire 47-W2, which will be described later, are electrically connected via the wire 51B.

Therefore, the stator 22 having the first star connection body 53A and the second star connection body 53B has two neutral points 51, which are the first neutral point 51A and the second neutral point 51B, as shown in FIG. Be prepared. In the third embodiment, each of the three-phase first series connection parts 52A is connected to one first neutral point 51A of the two neutral points 51, and each of the three-phase second series connection parts 52B is connected to one of the two neutral points 51. It is connected to the other second neutral point 51B.

FIG. 15 is a developed view for explaining the winding route of the windings 46 forming each winding portion 45 of the U phase in the third embodiment. FIG. 16 is a developed view for explaining the winding paths of the windings 46 forming each winding portion 45 of each phase in the third embodiment. 15 and 16, each winding part 45 forming the series connection part 52 of each phase is connected from the inner peripheral side of the yoke part 31 in the radial direction of the yoke part 31 (outer peripheral wall part 41 of the insulator 25). FIG. As shown in FIGS. 15 and 16, the winding portion 45 of each phase is formed by winding a winding 46 counterclockwise (CCW: Counter Clock Wise).

The insulator 25 in Example 3 differs from the insulators 25 in Examples 1 and 2 in the arrangement and number of crossover wire holding slits 44A, neutral wire holding slits 44B, and binding wire holding slits 44C in the circumferential direction of the outer peripheral wall 41. . Further, the neutral line holding slit 44B in the third embodiment includes the neutral line exclusive holding slit 44B1, but does not include the dual-purpose holding slit 44B2 in the first and second embodiments. The insulator 25 in Example 3 has two binding wire holding slits 44C.

As shown in FIG. 16, in the third embodiment, each of the first winding parts 45 that start winding the three-phase windings 46 among the plurality of winding parts 45 of the first star connection body 53A, that is, the U-phase The first U-phase winding 46-U1 (first winding part [1]) is the first winding part 45 of the W phase, and the first W-phase winding 46 is the first winding part 45 of the W phase. -W1 (third winding part [3]) and the first V-phase winding 46-V1 (fifth winding part [5]), which is the first winding part 45 of the V phase, are connected to the insulator 25. In the circumferential direction (circumferential direction of the stator core 23), another winding part 45 (one winding part 45 that is not the "first winding part 45" of the U phase, V phase, W phase) The center angles of the insulators 25 with respect to the circumferential direction are arranged at intervals of 60 degrees so as to be sandwiched therebetween. Similarly, in the third embodiment, each of the first winding parts 45 that start winding the three-phase windings 46 among the plurality of winding parts 45 of the second star connection body 53B, that is, the third winding part of the U phase, The third U-phase winding 46-U3 (seventh winding part [7]) which is the winding part 45, and the third W-phase winding 46-W3 (the ninth winding part [7]) which is the third winding part 45 of the W phase. The winding part [9]) and the third V-phase winding 46-V3 (the eleventh winding part [11]), which is the third winding part 45 of the V-phase, are arranged in the circumferential direction of the insulator 25 (stator core 23 circumferential direction), with another winding part 45 (one winding part 45 that is not the "third winding part 45" of the U phase, V phase, and W phase) sandwiched therebetween. , the center angles of the insulators 25 with respect to the circumferential direction are arranged at intervals of 60 degrees. Further, in the third embodiment, the windings 46 are wound in the order of U phase, W phase, and V phase.

The winding 46 of each phase includes a first U-phase crossover wire 49-U1 connecting the first winding part [1] and the seventh winding part [7], a first U-phase connecting wire 49-U1 connecting the first winding part [1] and the seventh winding part [7], and a first U-phase crossover wire 49-U1 connecting the first winding part [1] and the seventh winding part [7], The second U-phase crossover wire 49-U2 connects the winding part [10], the first W-phase crossover wire 49-W1 connects the third winding part [3] and the sixth winding part [6], and the ninth The second W-phase crossover wire 49-W2 connects the winding part [9] and the twelfth winding part [12], and the first V connects the fifth winding part [5] and the eighth winding part [8]. It has a phase crossover wire 49-V1 and a second V-phase crossover wire 49-V2 that connects the eleventh winding part [11] and the second winding part [2].

In the third embodiment, as in the first and second embodiments, each of the plurality of neutral line holding slits 44B is connected to the lower insulator 25 when the insulator 25 is used as the lower insulator 25B, as shown in FIGS. 15 and 16. In the circumferential direction of the insulator 25B, the first U-phase connecting wire 49-U1, the first V-phase connecting wire 49-V1, and the first W-phase connecting wire 49-W1, which are the first connecting wires of each phase, extend from the inner periphery to the outer periphery of the lower insulator 25B. The connecting wire holding slits 44A are respectively arranged between the connecting wire holding slits 44A drawn out from each other. In other words, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the first U-phase winding 46-U1 extended from the first winding part [1] to connect the first U-phase crossover wire 49-U1. The connecting wire holding slit 44A is passed through to form a connecting wire holding slit 44A, and the first W-phase winding 46-W1 extended from the third winding part [3] is passed through to form a first W-phase connecting wire 49-W1. It is arranged between the crossover wire holding slit 44A and Similarly, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the first W-phase winding 46-W1 extended from the third winding part [3] to form the first W-phase crossover wire 49-W1. The first V-phase winding 46-V1 extending from the fifth winding part [5] is passed through the connecting wire holding slit 44A to form a first V-phase connecting wire 49-V1. The connecting wire holding slit 44A is arranged between the connecting wire holding slit 44A and the connecting wire holding slit 44A. Further, similarly to the above, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the second U-phase winding 46-U2 extended from the seventh winding part [7] to the second U-phase connecting wire 49. - The connecting wire holding slit 44A passed through to form U2 and the second W-phase winding 46-W2 extended from the ninth winding part [9] form a second W-phase connecting wire 49-W2. It is arranged between the connecting wire holding slit 44A and the connecting wire holding slit 44A. Similarly, in the circumferential direction of the lower insulator 25B, the neutral wire holding slit 44B allows the second W-phase winding 46-W2 extended from the ninth winding part [9] to form the second W-phase crossover wire 49-W2. The second V-phase winding 46-V2 extending from the eleventh winding part [11] is passed through the connecting wire holding slit 44A to form a second V-phase connecting wire 49-V2. The connecting wire holding slit 44A is arranged between the connecting wire holding slit 44A and the connecting wire holding slit 44A.

(Windling route in the lower insulator)
15 and 16, each winding part 45 forming 12 slots has a first winding part 45 in the order of going to one side in the circumferential direction of the yoke part 31 of the stator core 23, that is, the order of going from the left end to the right end in the figure. The winding portion to the twelfth winding portion are indicated by numbers [1] to [12].

As shown in FIG. 15, the first U-phase winding 46-U1 extending from the starting end S of the first U-phase power supply line 48-U1 connected to the U-phase power supply is opposite to the first stator core teeth portion 32-1. It is wound clockwise (CCW) to form a first winding part [1]. The first U-phase winding 46-U1 stretched from the first winding part [1] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. The first U-phase connecting wire 49-U1 is extended along the outer periphery of the first U-phase connecting wire 49-U1. The second U-phase winding 46-U2, which is drawn from the first U-phase crossover wire 49-U1 to the inner circumferential side of the outer peripheral wall 41 through the crossover wire holding slit 44A, is directed against the fourth stator core teeth portion 32-4. It is wound clockwise (CCW) to form a fourth winding part [4]. The first U-phase neutral wire 47-U1 extended from the fourth winding part [4] is extended to the terminal end E connected to the second neutral point 51B.

Similarly, in the U-phase, the third U-phase winding 46-U3 extending from the starting end S of the second U-phase power supply line 48-U2 connected to the U-phase power supply is connected counterclockwise to the seventh stator core teeth portion 32-7. It is wound around (CCW) to form the seventh winding part [7]. The third U-phase winding 46-U3 extended from the seventh winding part [7] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. , and forms a second U-phase crossover wire 49-U2. The fourth U-phase winding 46-U4, which is drawn from the second U-phase crossover wire 49-U2 through the crossover wire holding slit 44A to the inner peripheral side of the outer peripheral wall portion 41, is directed against the tenth stator core teeth portion 32-10. It is wound clockwise (CCW) to form a tenth winding part [10]. The second U-phase neutral wire 47-U2 extended from the tenth winding part [10] is extended to the terminal end E connected to the first neutral point 51A.

In this way, the U-phase winding 46 is stretched from the first stator core teeth part 32-1 to the fourth stator core teeth part 32-4 to form each winding part 45, and the seventh stator core teeth part 32-7 Each winding portion 45 is formed by extending from the stator core teeth portion 32-10 to the tenth stator core teeth portion 32-10.

As shown in FIG. 16, the first W-phase winding 46-W1 extending from the starting end S of the first W-phase power supply line 48-W1 connected to the W-phase power supply is opposite to the third stator core teeth portion 32-3. It is wound clockwise (CCW) to form a third winding part [3]. The first W-phase winding 46-W1 extended from the third winding part [3] of the third stator core teeth part 32-3 is inserted from the inner peripheral side of the outer peripheral wall part 41 of the lower insulator 25B to hold the crossover wire. It passes through the slit 44A and extends along the outer periphery of the outer peripheral wall portion 41, forming a first W-phase crossover wire 49-W1. The second W-phase winding 46-W2, which is drawn from the first W-phase crossover wire 49-W1 through the crossover wire holding slit 44A to the inner peripheral side of the outer peripheral wall portion 41, is directed against the sixth stator core teeth portion 32-6. It is wound clockwise (CCW) to form a sixth winding part [6]. The first W-phase neutral wire 47-W1 extended from the sixth winding part [6] is extended to the terminal end E connected to the first neutral point 51A.

Similarly, in the W-phase, the third W-phase winding 46-W3 extending from the starting end S of the second W-phase power supply line 48-W2 connected to the W-phase power supply is connected counterclockwise to the ninth stator core teeth portion 32-9. (CCW) to form the ninth winding part [9]. The third W-phase winding 46-W3 extended from the ninth winding part [9] passes from the inner peripheral side of the outer peripheral wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer peripheral wall 41. , and forms a second W-phase crossover wire 49-W2. The fourth W-phase winding 46-W4, which is drawn from the second W-phase crossover wire 49-W2 through the crossover wire holding slit 44A to the inner peripheral side of the outer peripheral wall portion 41, is directed against the twelfth stator core teeth portion 32-12. It is wound clockwise (CCW) to form a twelfth winding part [12]. The second W-phase neutral wire 47-W2 extended from the twelfth winding part [12] is extended to the terminal end E connected to the second neutral point 51B.

In this way, the W-phase winding 46 extends from the third stator core teeth part 32-3 to the sixth stator core teeth part 32-6 to form each winding part 45, and also forms the ninth stator core teeth part 32-9. The winding portions 45 are formed by extending the winding portions 45 over the twelfth stator core teeth portion 32-12.

Here, in the lower insulator 25B, the connecting wire holding slit 44A, through which one end of the first W-phase connecting wire 49-W1 extending to the sixth winding part [4] passes, is connected to the second U-phase neutral wire 47-U2 and the first V-phase connecting wire. The neutral wire 47-V1 and the first W-phase neutral wire 47-W1 are bundled and electrically connected together to pass through the first binding wire 50A, which is also used as the binding wire holding slit 44C, and the first W-phase connecting wire 49- It also serves to hold W1 and the first binding wire 50A. Similarly, the connecting wire holding slit 44A through which one end of the second W-phase connecting wire 49-W2 extending to the twelfth winding part [12] passes, includes the first U-phase neutral wire 47-U1 and the second V-phase neutral wire 47- It is also used as a binding wire holding slit 44C through which a second binding wire 50B, which bundles and electrically connects the V2 and second W phase neutral wires 47-W2, is passed, and connects the second W phase connecting wire 49-W2 and the second binding wire. It also serves to hold the wire 50B.

The first V-phase winding 46-V1 extending from the starting end S of the first V-phase power supply line 48-V1 connected to the V-phase power supply is wound counterclockwise (CCW) around the fifth stator core teeth portion 32-5. It is turned to form the fifth winding part [5]. The first V-phase winding 46-V1 extended from the fifth winding part [5] of the fifth stator core teeth part 32-5 is connected to the connecting wire holding part from the inner peripheral side of the outer peripheral wall part 41 of the lower insulator 25B. It passes through the slit 44A and extends along the outer periphery of the outer peripheral wall portion 41, forming a first V-phase crossover wire 49-V1. The second V-phase winding 46-V2, which is drawn from the first V-phase crossover wire 49-V1 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall 41, is directed against the eighth stator core teeth portion 32-8. It is wound clockwise (CCW) to form the eighth winding part [8]. The first V-phase neutral wire 47-V1 extended from the eighth winding part [8] is extended to the terminal end E connected to the first neutral point 51A.

Similarly, in the V-phase, the third V-phase winding 46-V3 extending from the starting end S of the second V-phase power supply line 48-V2 connected to the V-phase power supply is connected counterclockwise to the eleventh stator core teeth portion 32-11. It is wound around (CCW) to form the eleventh winding part [11]. The third V-phase winding 46-V3 extended from the eleventh winding part [11] passes from the inner circumferential side of the outer circumferential wall 41 of the lower insulator 25B through the connecting wire holding slit 44A to the outer circumferential wall 41. The V-phase connecting wire 49-V2 is extended along the outer periphery of the V-phase connecting wire 49-V2. The fourth V-phase winding 46-V4, which is drawn from the second V-phase crossover wire 49-V2 through the crossover wire holding slit 44A to the inner circumferential side of the outer peripheral wall portion 41, is directed against the second stator core teeth portion 32-2. It is wound clockwise (CCW) to form a second winding part [2]. The second V-phase neutral wire 47-V2 extended from the second winding part [2] is extended to the terminal end E connected to the second neutral point 51B.

In this way, the V-phase winding 46 extends from the fifth stator core teeth section 32-5 to the eighth stator core teeth section 32-8 to form each winding section 45, and also forms each winding section 45 at the eleventh stator core teeth section 32-11. Each winding portion 45 is formed by extending from the stator core teeth portion 32-2 to the second stator core teeth portion 32-2.

(Neutral wire crossing route in the upper insulator)
When the insulator 25 used as the lower insulator 25B as described above is used as the upper insulator 25A, as shown in FIG. 16, the first U-phase neutral wire 47 extending from the fourth winding part [4] -U1 is a neutral line holding slit 44B, and when the insulator 25 is used as the lower insulator 25B, the crossover wire 49 is passed through the neutral line holding slit B1 which is not passed through. The first U-phase neutral wire 47-U1 passed through the neutral wire exclusive holding slit B1 is pulled out from the inner circumferential side of the upper insulator 25A to the outer circumferential side, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. . Similarly, in the U phase, the second U phase neutral wire 47-U2 extended from the tenth winding part [10] is a neutral wire holding slit 44B, and the insulator 25 is used as a lower insulator 25B. When the crossover wire 49 is not passed through, it is passed through the neutral wire exclusive holding slit B1. The second U-phase neutral wire 47-U2 passed through the neutral wire-dedicated holding slit B1 is pulled out from the inner circumferential side to the outer circumferential side of the upper insulator 25A, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. .

In addition, the first W-phase neutral wire 47-W1 extended from the sixth winding part [6] is a neutral wire holding slit 44B, and crosses when the insulator 25 is used as the lower insulator 25B. The wire 49 is passed through the neutral wire exclusive holding slit B1 which is not passed through. The first W-phase neutral wire 47-W1 passed through the neutral wire exclusive holding slit B1 is pulled out from the inner circumferential side of the upper insulator 25A to the outer circumferential side, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. . Similarly, in the W phase, the second W phase neutral wire 47-W2 extended from the 12th winding part [12] is a neutral wire holding slit 44B, and the insulator 25 is used as the lower insulator 25B. When the crossover wire 49 is not passed through, it is passed through the neutral wire exclusive holding slit B1. The second W-phase neutral wire 47-W2 passed through the neutral wire exclusive holding slit B1 is pulled out from the inner circumferential side of the upper insulator 25A to the outer circumferential side, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. .

Further, the first V-phase neutral wire 47-V1 extended from the eighth winding part [8] is a neutral wire holding slit 44B, and crosses when the insulator 25 is used as the lower insulator 25B. The wire 49 is passed through the neutral wire exclusive holding slit B1 which is not passed through. The first V-phase neutral wire 47-V1 passed through the neutral wire exclusive holding slit B1 is pulled out from the inner circumferential side to the outer circumferential side of the upper insulator 25A, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. . Similarly, in the V phase, the second V phase neutral wire 47-V2 extended from the second winding part [2] is the neutral wire holding slit 44B, and the insulator 25 is used as the lower insulator 25B. When the crossover wire 49 is not passed through, it is passed through the neutral wire exclusive holding slit B1. The second V-phase neutral wire 47-V2 passed through the neutral wire exclusive holding slit B1 is pulled out from the inner circumferential side of the upper insulator 25A to the outer circumferential side, and is spanned along the outer circumferential wall portion 41 of the upper insulator 25A. .

Subsequently, the first U-phase neutral wire 47-U1, the second V-phase neutral wire 47-V2, and the second W-phase neutral wire 47-W2, which are extended over the outer peripheral surface of the outer peripheral wall portion 41 of the upper insulator 25A, are as follows. As shown by the auxiliary lines represented by two-dot chain lines in FIG. 16, the height positions of the upper insulators 25A with respect to the axial direction are aligned, so that the upper insulators 25A are hung at the same height position along the circumferential direction of the outer peripheral wall portion 41. The three neutral wires 47 are twisted together at one location, fixed to the outer peripheral wall 41, and easily bundled into one wire. The three neutral wires 47 bundled into one are formed as one first binding wire 50A by forming a first neutral point 51A using the splice terminal 60. As shown in FIG. 12, the thus formed first binding wire 50A is passed from the outer peripheral side of the outer peripheral wall portion 41 of the upper insulator 25A through the binding wire holding slit 44C to the inner peripheral side of the upper insulator 25A. It is pulled in and inserted into the gap G between the eighth winding part [8] and the ninth winding part [9] located near the binding wire holding slit 44C and held.

Similarly, the second U-phase neutral wire 47-U2, the first V-phase neutral wire 47-V1, and the first W-phase neutral wire 47-W1 are extended over the outer peripheral surface of the outer peripheral wall portion 41 of the upper insulator 25A. 16, the height positions of the upper insulators 25A in the axial direction are aligned, so that the upper insulators 25A are hung at the same height position along the circumferential direction of the outer peripheral wall 41. The three neutral wires 47 are twisted together at one place, fixed to the outer peripheral wall 41, and easily bundled into one wire. The three neutral wires 47 bundled into one are formed as one second binding wire 50B by forming a second neutral point 51B using the splice terminal 60. As shown in FIG. 12, the second binding wire 50B formed in this way is passed from the outer peripheral side of the outer peripheral wall portion 41 of the upper insulator 25A through the binding wire holding slit 44C to the inner peripheral side of the upper insulator 25A. It is pulled in and inserted into the gap G between the second winding part [2] and the third winding part [3] located near the binding wire holding slit 44C and held.

(Effects of Example 3)
As described above, the electric motor 6 of the third embodiment also has a plurality of crossover wire holding slits 44A when the insulator 25 is used as the lower insulator 25B, and a plurality of neutral wire holding slits when the insulator 25 is used as the upper insulator 25A. The slits 44B are formed in the insulator 25, and the plurality of neutral wire holding slits 44B are formed to have the same depth in the axial direction of the insulator 25 (the axial direction of the rotating shaft 3), and the insulator 25 is used as the lower insulator 25B. It includes a neutral line exclusive holding slit 44B1 when the neutral line is held. As a result, in the third embodiment, as in the first and second embodiments, the upper insulator 25A and the lower insulator 25B provided at both ends of the stator core 23 are made common, and a plurality of neutral wires 47 are bundled to electrically The workability of the connecting binding process can be improved.

1 Compressor 2 Container 3 Rotating shaft 5 Compression section 6 Electric motor 21 Rotor 22 Stator 23 Stator core 25 Insulator 25A Upper insulator (second insulator)
25B Lower insulator (first insulator)
31 Yoke part 32 (32-1 to 32-9) Stator core teeth part (teeth part)
44 Slit 44A Crossover wire holding slit 44B Neutral wire holding slit 44B1 Neutral wire exclusive holding slit 44B2 Dual-purpose holding slit 44C Binding wire holding slit 45 Winding part 46 Winding wire 46-U1 1st U phase winding 46-U2 2nd U phase Winding wire 46-U3 3rd U-phase winding 46-U4 4th U-phase winding 46-V1 1st V-phase winding 46-V2 2nd V-phase winding 46-V3 3rd V-phase winding 46-V4 4th V-phase winding 46-W1 1st W-phase winding 46-W2 2nd W-phase winding 46-W3 3rd W-phase winding 46-W4 4th W-phase winding 47 Neutral wire 47-U U-phase neutral wire 47-U1 1st U-phase Neutral wire 47-U2 2nd U phase neutral wire 47-V V phase neutral wire 47-V1 1st V phase neutral wire 47-V2 2nd V phase neutral wire 47-W W phase neutral wire 47-W1 1st 1W phase neutral wire 47-W2 2nd W phase neutral wire 49 Crossover wire 49-U1 1st U phase crossover wire (1st crossover wire)
49-U2 2nd U phase crossover wire (second crossover wire)
49-U3 3rd U phase crossover wire 49-U4 4th U phase crossover wire 49-V1 1st V phase crossover wire (1st crossover wire)
49-V2 2nd V phase crossover wire (second crossover wire)
49-V3 3rd V phase crossover wire 49-V4 4th V phase crossover wire 49-W1 1st W phase crossover wire (1st crossover wire)
49-W2 2nd W phase crossover wire (second crossover wire)
49-W3 3rd W phase crossover wire 49-W4 4th W phase crossover wire 50 Binding wire 50A 1st binding wire 50B 2nd binding wire

Claims (10)

comprising a rotor, a stator disposed on the outer peripheral side of the rotor, and a rotating shaft connected to the rotor,
The stator includes: a stator core having an annular yoke portion and a plurality of teeth portions protruding radially inwardly of the yoke portion; an annular insulator disposed at both ends of the stator core in the axial direction of the rotating shaft; A plurality of winding portions formed by winding wires around each of a plurality of teeth portions, and a plurality of winding portions extending in the circumferential direction of the insulator so as to connect the winding portions of the same phase in three phases. a crossover wire, and a plurality of neutral wires extending from the winding portion of each phase and connected at a neutral point,
The insulator includes a first insulator disposed at one end of the stator core in the axial direction, and a second insulator disposed at the other end of the stator core in the axial direction, and the first insulator and the An electric motor in which the second insulator is formed in the same shape,
The insulator includes a plurality of connecting wire holding slits through which each connecting wire is passed in the radial direction of the first insulator when the insulator is used as the first insulator, and the insulator is used as the second insulator. a plurality of neutral wire holding slits through which each neutral wire drawn out from the winding portion to the outer periphery of the second insulator is passed;
The plurality of neutral wire holding slits are formed to have equal depths extending in the axial direction of the insulator, and include a neutral wire holding slit,
In the electric motor, the neutral line exclusive holding slit is a neutral line holding slit exclusive for a neutral line through which the crossover wire is not passed when the insulator is used as the first insulator. The plurality of connecting wire holding slits hold connecting wires of different phases at different positions in the axial direction and hold connecting wires of the same phase at different positions in the axial direction when the insulator is used as the first insulator. shaped to hold in the same position,
The electric motor according to claim 1. The plurality of neutral wire holding slits include a dual-purpose holding slit,
The dual-purpose holding slit also serves as the crossover wire holding slit when the insulator is used as the first insulator,
The electric motor according to claim 1. A binding wire holding slit is formed in the insulator,
The binding wire holding slit is a slit through which a binding wire that bundles and connects the plurality of neutral wires is passed from the outer periphery to the inner periphery of the second insulator when the insulator is used as the second insulator. ,
The electric motor according to claim 1. The binding wire holding slit also serves as the crossover wire holding slit when the insulator is used as the first insulator,
The electric motor according to claim 4. Each of the plurality of neutral wire holding slits extends in the circumferential direction of the first insulator from a first winding portion where the winding wire of each phase is started to be wound when the insulator is used as the first insulator. each arranged between the crossover wire holding slits through which the crossover wires are passed;
The electric motor according to claim 1. Each of the first winding portions for starting winding of the three-phase windings are arranged adjacent to each other in the circumferential direction of the insulator,
Each of the last winding portions at which the windings of the three phases are wound are arranged adjacent to each other in the circumferential direction of the insulator.
The electric motor according to claim 1. The windings of each phase include a first winding part, a second winding part, and a third winding part arranged in order along the circumferential direction of the insulator, and a first winding part, a second winding part, and a third winding part arranged in order along the circumferential direction of the insulator. a first connecting wire connecting the winding portion and the second winding portion; and a second connecting wire connecting the second winding portion and the third winding portion. ,
Each of the plurality of neutral wire holding slits is configured such that when the insulator is used as the first insulator, the first crossover wire of each phase is separated from the inner periphery of the first insulator in the circumferential direction of the first insulator. Each wire is placed between the connecting wire holding slits that are pulled out to the outer periphery.
The electric motor according to claim 1. In the first insulator, a connecting wire holding slit through which one end of the first connecting wire extending from the first connecting wire of one of the three phases to the second winding portion is passed; Among the connecting wire holding slits through which one end of the second connecting wire extending from the second connecting wire to the second winding portion is passed, one connecting wire holding slit is connected to the second connecting wire in the second insulator. In addition to serving as a neutral wire holding slit, the other crossover wire holding slit also serves as a binding wire holding slit through which a binding wire connecting the plurality of neutral wires is passed from the outer periphery to the inner periphery of the second insulator. ,
The electric motor according to claim 8. The electric motor according to any one of claims 1 to 9,
a compression section driven by the electric motor;
a container that houses the electric motor and the compression section therein;
A compressor equipped with

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