Motor and compressor

Abstract

To reduce height in an axial direction of an insulator.SOLUTION: A stator 22 of a motor comprises: an outer peripheral wall part 35 formed with a plurality of slits 48 consisting of four slits provided in each phase; a plurality of coils 24 consisting of four coils provided in each phase; and a plurality of crossover wires 42 consisting of two crossover wires provided in each phase. A first crossover wire of the two crossover wires of a certain phase connects two coils of the four coils of the phase, passes through two slits of the four slits of the phase so that a part of the first crossover wire is arranged on an outer peripheral side of the outer peripheral wall part 35, a second crossover wire of the two crossover wires of the phase connects two other coils of the four coils of the phase, passes through two other slits of the four slits of the phase so that a part of the second crossover wire is arranged on the outer peripheral side of the outer peripheral wall part 35, and depth of the two slits of the four slits of each phase is predetermined depth.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a motor and a compressor. [Background technology]

[0002] A known compressor houses a motor and a compressor unit that compresses a refrigerant using rotational power generated by the motor inside a container. The motor has an annular stator (stator core) arranged on the outer periphery of a rotor. The stator has a plurality of teeth protruding from the inner periphery of the annular yoke of the stator core toward the rotor, a plurality of windings (coils) formed by winding conductors around each of the plurality of teeth, and a cylindrical insulator arranged at one end of the stator core in the axial direction. When the stator has 12 teeth (12 windings) and the rotor has eight poles, two windings of the same phase may be connected via a crossover wire. Each crossover wire passes through two slits formed in the cylindrical portion and is arranged on the outer periphery of the cylindrical insulator (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-119885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such motors, when multiple crossover wires are arranged in the axial direction parallel to the rotation axis, the axial height of the cylindrical insulator needs to be increased to prevent crossover wires of different phases from coming into electrical contact with each other, which can result in the motor becoming larger in the axial direction.

[0005] The disclosed technology has been made in consideration of the above points, and aims to provide a motor and a compressor in which the axial height of a cylindrical insulator can be reduced. [Means for solving the problem]

[0006] A motor according to one aspect of the present disclosure includes a rotor and a stator that generates a magnetic field that rotates the rotor about a rotation axis, the stator having a stator core having an annular yoke portion that surrounds an outer periphery of the rotor and a plurality of teeth, first to twelfth teeth, that protrude from an inner periphery of the yoke portion toward the rotor and are arranged in a circumferential direction, a cylindrical insulator that is arranged at one end of the stator core in an axial direction that is parallel to the rotation axis, and a plurality of windings formed by winding a conductor around each of the plurality of teeth via the insulator, the plurality of windings including four U-phase windings, four V-phase windings, and four W-phase windings, and are arranged such that two adjacent windings in the circumferential direction of the stator core are windings of different phases, and the stator has two of the four windings that are in the same phase for each of three phases. and a second jumper wire that is a jumper wire that connects the other two of the four windings of the same phase, wherein the insulator is formed with a plurality of slits, including a plurality of outlet-side slits that are drawn out from the ends of the windings connected to the jumper wires, and a plurality of lead-in-side slits that are drawn into the starts of the windings connected to the jumper wires, and each of the plurality of jumper wires connects the two windings of the same phase by passing through two slits, the outlet-side slit and the lead-in-side slit, that are formed in the insulator, and in each of the three phases, at least two of the four slits, the outlet-side slit of the first jumper wire, the lead-in-side slit of the first jumper wire, the outlet-side slit of the second jumper wire, and the lead-in-side slit of the second jumper wire, have the same depth. [Effects of the Invention]

[0007] The disclosed motor and compressor enable the axial height of the cylindrical insulator to be reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a compressor provided with a motor according to a first embodiment. [Figure 2] FIG. 2 is a plan view showing the stator core. [Figure 3] FIG. 3 is a plan view showing the motor. [Figure 4] FIG. 4 is a connection diagram showing the connection state of a plurality of windings. [Figure 5] FIG. 5 is a development view showing the stator. [Figure 6] FIG. 6 is a development view showing the stator of the motor of Comparative Example 1. As shown in FIG. [Figure 7] FIG. 7 is a development view showing the stator of the motor of Comparative Example 2. As shown in FIG. [Figure 8] FIG. 8 is a development view showing the stator of the motor of Comparative Example 3. As shown in FIG. [Figure 9] FIG. 9 is a wiring diagram showing the connection state of a plurality of windings of the motor of the second embodiment. [Figure 10] FIG. 10 is a development view showing the stator of the motor of the second embodiment. [Figure 11] FIG. 11 is a wiring diagram showing the connection state of a plurality of windings of the motor of the third embodiment. [Figure 12] FIG. 12 is a development view showing the stator of the motor of the third embodiment. [Figure 13] FIG. 13 is a wiring diagram showing the connection state of a plurality of windings of the motor of the fourth embodiment. [Figure 14] FIG. 14 is a development view showing the stator of the motor of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a motor and a compressor according to embodiments of the present disclosure will be described with reference to the drawings. Note that the following description does not limit the technology of the present disclosure. In the following description, the same components are given the same reference numerals, and duplicated descriptions will be omitted. [Example]

[0010] As shown in FIG. 1, the motor 5 of the first embodiment is provided in a compressor 1. FIG. 1 is a longitudinal cross-sectional view showing the compressor 1 in which the motor 5 of the first embodiment is provided. The compressor 1 includes a housing 2, a shaft 3, a motor 5, and a compression unit 6. An internal space 7 that is separated from the outside of the housing 2 is formed inside the housing 2. The internal space 7 is formed in a roughly cylindrical shape. The housing 2 is formed so that when placed upright on a horizontal installation surface, the central axis of the cylinder formed by the internal space 7 is parallel to the vertical direction.

[0011] The housing 2 is equipped with a U-phase power terminal 8U, a V-phase power terminal 8V, and a W-phase power terminal 8W. The U-phase power terminal 8U is made of a conductor. The U-phase power terminal 8U penetrates the top of the housing 2, with one end of the U-phase power terminal 8U disposed in the internal space 7 and the other end disposed outside the housing 2. The V-phase power terminal 8V is made of a conductor. The V-phase power terminal 8V penetrates the top of the housing 2, with one end of the V-phase power terminal 8V disposed in the internal space 7 and the other end disposed outside the housing 2. The W-phase power terminal 8W is made of a conductor. The W-phase power terminal 8W penetrates the top of the housing 2, with one end of the W-phase power terminal 8W disposed in the internal space 7 and the other end disposed outside the housing 2. The U-phase power supply terminal 8U, the V-phase power supply terminal 8V, and the W-phase power supply terminal 8W are attached to the housing 2 so that the U-phase power supply terminal 8U, the V-phase power supply terminal 8V, and the W-phase power supply terminal 8W are not electrically connected to each other and so that the U-phase power supply terminal 8U, the V-phase power supply terminal 8V, and the W-phase power supply terminal 8W are not electrically connected to the housing 2.

[0012] The housing 2 further includes a suction pipe 11 and a discharge pipe 12. A flow path 14 is formed inside the suction pipe 11. The suction pipe 11 is attached to the housing 2 so that the flow path 14 is connected to the lower part of the internal space 7. A flow path 15 is formed inside the discharge pipe 12. The discharge pipe 12 is attached to the housing 2 so that the flow path 15 is connected to the upper part of the internal space 7. The shaft 3 is formed in a rod shape. The shaft 3 is disposed in the internal space 7 along a rotation axis 16 that follows the central axis of the cylinder formed by the internal space 7, and is supported by the housing 2 so as to be rotatable around the rotation axis 16.

[0013] The motor 5 is disposed in the upper part of the internal space 7. The motor 5 includes a rotor 21 and a stator 22. The rotor 21 is formed in a generally cylindrical shape. The rotor 21 is fixed to the shaft 3 and supported by the housing 2 so as to be rotatable about the rotation axis 16. The stator 22 is formed in a generally cylindrical shape. The stator 22 is disposed so as to surround the rotor 21 and is fixed to the housing 2. The stator 22 includes a stator core 23, a plurality of windings 24, a lower insulator 25, and an upper insulator 26. The lower insulator 25 is disposed below the stator core 23. The upper insulator 26 is disposed above the stator core 23.

[0014] The compression unit 6 is disposed below the motor 5 in the internal space 7. The compression unit 6 is a rotary compression mechanism that compresses the refrigerant supplied via the suction pipe 11 as the shaft 3 rotates, and supplies the compressed refrigerant to the space between the motor 5 and the compression unit 6 in the internal space 7.

[0015] FIG. 2 is a plan view showing stator core 23. Stator core 23 is formed by laminating a plurality of electromagnetic steel plates made of a soft magnetic material, such as silicon steel plates. Stator core 23 includes a yoke portion 31 and a plurality of stator core teeth portions 32-1 to 32-12. Yoke portion 31 is formed in a generally cylindrical shape and is disposed in internal space 7 such that the central axis of yoke portion 31 overlaps with rotational axis 16 of rotor 21. Of the plurality of stator core teeth portions 32-1 to 32-12, first stator core teeth portion 32-1 is formed in a generally columnar shape. First stator core teeth portion 32-1 is formed integrally with yoke portion 31 such that one end of first stator core teeth portion 32-1 is adjacent to the inner circumferential surface of yoke portion 31, i.e., protrudes from the inner circumferential surface of yoke portion 31 toward rotational axis 16. Of the multiple stator core teeth portions 32-1 to 32-12, the other stator core teeth portions different from first stator core teeth portion 32-1 are also formed in a generally cylindrical shape, similar to first stator core teeth portion 32-1, and protrude from the inner circumferential surface of yoke portion 31. The multiple stator core teeth portions 32-1 to 32-12 are aligned at equal intervals in the circumferential direction on the inner circumferential surface of yoke portion 31, and are arranged at 30-degree intervals around rotation axis 16.

[0016] 3 is a plan view showing the motor 5. The lower insulator 25 is made of an insulator such as polybutylene terephthalate resin (PBT). The lower insulator 25 includes an outer peripheral wall 35 and a plurality of insulator teeth 36-1 to 36-12. The outer peripheral wall 35 is formed in a generally cylindrical shape. Of the plurality of insulator teeth 36-1 to 36-12, the first insulator tooth 36-1 is formed in a columnar shape. The first insulator tooth 36-1 is formed integrally with the outer peripheral wall 35 such that one end of the first insulator tooth 36-1 is adjacent to the inner peripheral surface of the outer peripheral wall 35, i.e., it protrudes from the inner peripheral surface of the outer peripheral wall 35 toward the rotating shaft 16. Like the first insulator tooth portion 36-1, the other insulator teeth portions of the multiple insulator teeth portions 36-1 to 36-12 that are different from the first insulator tooth portion 36-1 are also formed in a generally columnar shape and protrude from the inner peripheral surface of the outer peripheral wall portion 35. The multiple insulator teeth portions 36-1 to 36-12 are aligned at equal intervals in the circumferential direction on the inner peripheral surface of the outer peripheral wall portion 35 and are arranged at 30-degree intervals around the central axis of the outer peripheral wall portion 35.

[0017] The lower insulator 25 is arranged below the stator core 23 so that one end of the outer wall portion 35 in the axial direction parallel to the rotation axis 16 is adjacent to the lower end of the yoke portion 31 of the stator core 23, and so that the multiple insulator tooth portions 36-1 to 36-12 are adjacent to the lower ends of the multiple stator core tooth portions 32-1 to 32-12, respectively.

[0018] Upper insulator 26 is formed in the same manner as lower insulator 25, and includes an outer peripheral wall portion and a plurality of insulator teeth portions. Upper insulator 26 is disposed on stator core 23 so that one axial end of the outer peripheral wall portion is adjacent to the upper end of yoke portion 31 of stator core 23, and so that the plurality of insulator teeth are adjacent to the upper ends of the plurality of stator core teeth portions 32-1 to 32-12, respectively. Because upper insulator 26 is formed in the same manner as lower insulator 25, motor 5 does not need to manufacture upper insulator 26 separately from lower insulator 25, and by utilizing the lower insulator 25 that is manufactured as upper insulator 26, manufacturing costs can be reduced.

[0019] The first stator core teeth portion 32-1 is wound with one of the plurality of windings 24 together with the first insulator teeth portion 36-1 of the lower insulator 25 and one of the plurality of insulator teeth portions of the upper insulator 26. Another stator core teeth portion of the plurality of stator core teeth portions 32-1 to 32-12 other than the first stator core teeth portion 32-1 is also wound with one of the plurality of windings 24 together with one of the plurality of insulator teeth portions 36-1 to 36-12 of the lower insulator 25 and one of the plurality of insulator teeth portions of the upper insulator 26. The stator 22 has a plurality of windings 24 wound around the plurality of stator core tooth portions 32-1 to 32-12 together with the plurality of insulator tooth portions 36-1 to 36-12 and the plurality of insulator tooth portions of the upper insulator 26, thereby preventing the plurality of windings 24 from being electrically short-circuited to the stator core 23.

[0020] The rotor 21 includes a rotor core 38 and eight permanent magnets 39. The rotor core 38 is formed by laminating a plurality of thin plates made of a magnetic material, such as silicon steel, and is formed in a generally cylindrical shape. The rotor core 38 is fixed to the shaft 3 by inserting the shaft 3 through the center of the rotor core 38. Each of the eight permanent magnets 39 is formed in a plate shape. The eight permanent magnets 39 are embedded inside the rotor core 38, arranged at equal intervals around the circumferential direction of the rotor 21, and fixed to the rotor core 38. The eight permanent magnets 39 give the rotor 21 eight poles.

[0021] As shown in FIG. 4, the stator 22 includes a first neutral point 41-1, a second neutral point 41-2, a plurality of crossover wires 42, a plurality of neutral wires 43, and a plurality of power supply wires 44. FIG. 4 is a wiring diagram showing the connection state of the plurality of windings 24. The first neutral point 41-1 is electrically insulated from the second neutral point 41-2. The plurality of windings 24 includes four U-phase windings 24-U1 to 24-U4, four V-phase windings 24-V1 to 24-V4, and four W-phase windings 24-W1 to 24-W4. The plurality of crossover wires 42 includes two U-phase crossover wires 42-U1 to 42-U2, two V-phase crossover wires 42-V1 to 42-V2, and two W-phase crossover wires 42-W1 to 42-W2.

[0022] The four U-phase windings 24-U1 to 24-U4 include a first U-phase winding 24-U1, a second U-phase winding 24-U2, a third U-phase winding 24-U3, and a fourth U-phase winding 24-U4. The two U-phase crossover wires 42-U1 to 42-U2 include a first U-phase crossover wire 42-U1 and a second U-phase crossover wire 42-U2. One end of the first U-phase winding 24-U1 is connected to one end of the second U-phase winding 24-U2 via the first U-phase crossover wire 42-U1. That is, the stator 22 is provided with a first U-phase series connection 45-U1 in which the first U-phase winding 24-U1 and the second U-phase winding 24-U2 are connected in series. One end of the third U-phase winding 24-U3 is connected to one end of the fourth U-phase winding 24-U4 via a second U-phase crossover wire 42-U2. That is, the stator 22 is provided with a second U-phase series-connection portion 45-U2 in which the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 are connected in series.

[0023] The plurality of neutral wires 43 include a first U-phase neutral wire 43-U1 and a second U-phase neutral wire 43-U2. The other end of the second U-phase winding 24-U2 is connected to a first neutral point 41-1 via the first U-phase neutral wire 43-U1. The other end of the fourth U-phase winding 24-U4 is connected to a second neutral point 41-2 via the second U-phase neutral wire 43-U2.

[0024] The multiple power supply lines 44 include a first U-phase power supply line 44-U1 and a second U-phase power supply line 44-U2. The other end of the first U-phase winding 24-U1 is connected to a U-phase power supply terminal 8U via the first U-phase power supply line 44-U1. The other end of the third U-phase winding 24-U3 is connected to a U-phase power supply terminal 8U via a second U-phase power supply line 44-U2. In other words, the first U-phase series-connection part 45-U1 and the second U-phase series-connection part 45-U2 are connected in parallel.

[0025] The four V-phase windings 24-V1 to 24-V4 include a first V-phase winding 24-V1, a second V-phase winding 24-V2, a third V-phase winding 24-V3, and a fourth V-phase winding 24-V4. The two V-phase crossover wires 42-V1 to 42-V2 further include a first V-phase crossover wire 42-V1 and a second V-phase crossover wire 42-V2. One end of the first V-phase winding 24-V1 is connected to one end of the second V-phase winding 24-V2 via the first V-phase crossover wire 42-V1. That is, the stator 22 is provided with a first V-phase series connection 45-V1 in which the first V-phase winding 24-V1 and the second V-phase winding 24-V2 are connected in series. One end of the third V-phase winding 24-V3 is connected to one end of the fourth V-phase winding 24-V4 via a second V-phase crossover wire 42-V2. That is, the stator 22 is provided with a second V-phase series-connection portion 45-V2 in which the third V-phase winding 24-V3 and the fourth V-phase winding 24-V4 are connected in series.

[0026] The plurality of neutral wires 43 further includes a first V-phase neutral wire 43-V1 and a second V-phase neutral wire 43-V2. The other end of the second V-phase winding 24-V2 is connected to the first neutral point 41-1 via the first V-phase neutral wire 43-V1. The other end of the fourth V-phase winding 24-V4 is connected to the second neutral point 41-2 via the second V-phase neutral wire 43-V2.

[0027] The multiple power supply lines 44 further include a first V-phase power supply line 44-V1 and a second V-phase power supply line 44-V2. The other end of the first V-phase winding 24-V1 is connected to a V-phase power supply terminal 8V via the first V-phase power supply line 44-V1. The other end of the third V-phase winding 24-V3 is connected to a V-phase power supply terminal 8V via a second V-phase power supply line 44-V2. In other words, the first V-phase series-connected part 45-V1 and the second V-phase series-connected part 45-V2 are connected in parallel.

[0028] The four W-phase windings 24-W1 to 24-W4 include a first W-phase winding 24-W1, a second W-phase winding 24-W2, a third W-phase winding 24-W3, and a fourth W-phase winding 24-W4. The two W-phase crossover wires 42-W1 to 42-W2 further include a first W-phase crossover wire 42-W1 and a second W-phase crossover wire 42-W2. One end of the first W-phase winding 24-W1 is connected to one end of the second W-phase winding 24-W2 via the first W-phase crossover wire 42-W1. That is, the stator 22 is provided with a first W-phase series connection 45-W1 in which the first W-phase winding 24-W1 and the second W-phase winding 24-W2 are connected in series. One end of the third W-phase winding 24-W3 is connected to one end of the fourth W-phase winding 24-W4 via a second W-phase crossover wire 42-W2. That is, the stator 22 is provided with a second W-phase series-connection 45-W2 in which the third W-phase winding 24-W3 and the fourth W-phase winding 24-W4 are connected in series.

[0029] The plurality of neutral wires 43 further includes a first W-phase neutral wire 43-W1 and a second W-phase neutral wire 43-W2. The other end of the second W-phase winding 24-W2 is connected to the first neutral point 41-1 via the first W-phase neutral wire 43-W1. The other end of the fourth W-phase winding 24-W4 is connected to the second neutral point 41-2 via the second W-phase neutral wire 43-W2.

[0030] The multiple power lines 44 further include a first W-phase power line 44-W1 and a second W-phase power line 44-W2. The other end of the first W-phase winding 24-W1 is connected to a W-phase power terminal 8W via the first W-phase power line 44-W1. The other end of the third W-phase winding 24-W3 is connected to a W-phase power terminal 8W via a second W-phase power line 44-W2. In other words, the first W-phase series-connection part 45-W1 and the second W-phase series-connection part 45-W2 are connected in parallel.

[0031] For convenience, when any one of the U, V, and W phases is designated as the X phase, the four X-phase windings are referred to as the first X-phase winding, the second X-phase winding, the third X-phase winding, and the fourth X-phase winding in circumferential order. The first U-phase winding 24-U1 is wound around the first stator core teeth portion 32-1. The second U-phase winding 24-U2 is wound around the fourth stator core teeth portion 32-4. The third U-phase winding 24-U3 is wound around the seventh stator core teeth portion 32-7. The fourth U-phase winding 24-U4 is wound around the tenth stator core teeth portion 32-10. The first V-phase winding 24-V1 is wound around the fifth stator core teeth portion 32-5. The second V-phase winding 24-V2 is wound around the eighth stator core tooth portion 32-8. The third V-phase winding 24-V3 is wound around the eleventh stator core tooth portion 32-11. The fourth V-phase winding 24-V4 is wound around the second stator core tooth portion 32-2. The first W-phase winding 24-W1 is wound around the ninth stator core tooth portion 32-9. The second W-phase winding 24-W2 is wound around the twelfth stator core tooth portion 32-12. The third W-phase winding 24-W3 is wound around the third stator core tooth portion 32-3. The fourth W-phase winding 24-W4 is wound around the sixth stator core tooth portion 32-6.

[0032] That is, as shown in FIG. 5, the multiple windings 24 are arranged in the circumferential direction of the stator core 23, repeating the order of U-phase, V-phase, and W-phase. FIG. 5 is a development view showing the stator 22. The multiple windings 24 are also arranged so that the multiple windings 24 are connected in adjacent poles. That is, the multiple windings 24 are arranged so that no winding of the same phase as any two of the multiple windings 24 that are connected in series is located between those two windings in the circumferential direction. For example, the four U-phase windings 24-U1 to 24-U4 are arranged so that the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4, which are windings of the same phase, are not located between the first U-phase winding 24-U1 and the second U-phase winding 24-U2 that constitute the first U-phase series-connected unit 45-U1 in the circumferential direction.

[0033] A plurality of slits 48 are formed in the outer peripheral wall portion 35 of the lower insulator 25. Each of the plurality of slits 48 is formed from an end of the outer peripheral wall portion 35 that is farther from the stator core 23 toward the stator core 23. The plurality of slits 48 include four U-phase slits 48-U1 to 48-U4, four V-phase slits 48-V1 to 48-V4, and four W-phase slits 48-W1 to 48-W4.

[0034] The four U-phase slits 48-U1 to 48-U4 include a first U-phase lead-out slit 48-U1, a first U-phase lead-in slit 48-U2, a second U-phase lead-out slit 48-U3, and a second U-phase lead-in slit 48-U4. The first U-phase lead-out slit 48-U1 is formed in a portion of the outer peripheral wall 35 on the anti-lead side of the first stator core teeth 32-1 where the lower insulator 25 is disposed as viewed from the stator core 23, and the depth of the first U-phase lead-out slit 48-U1 is formed to a first depth d1. The first U-phase lead-in slit 48-U2 is formed in a portion of the outer peripheral wall 35 on the anti-lead side of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-in slit 48-U2 is formed to a first depth d1. The second U-phase lead-out slit 48-U3 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the seventh stator core teeth 32-7, and has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-in slit 48-U4 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the tenth stator core teeth 32-10, and has a second depth d2.

[0035] The four V-phase slits 48-V1 to 48-V4 include a first V-phase lead-out slit 48-V1, a first V-phase lead-in slit 48-V2, a second V-phase lead-out slit 48-V3, and a second V-phase lead-in slit 48-V4. The first V-phase lead-out slit 48-V1 is formed in a portion of the outer peripheral wall 35 on the opposite side from the fifth stator core teeth 32-5, and the first V-phase lead-out slit 48-V1 has a first depth d1. The first V-phase lead-in slit 48-V2 is formed in a portion of the outer peripheral wall 35 on the opposite side from the eighth stator core teeth 32-8, and the first V-phase lead-in slit 48-V2 has a first depth d1. The second V-phase lead-side slit 48-V3 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the eleventh stator core teeth 32-11, and has a depth of the second depth d2. The second V-phase lead-side slit 48-V4 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the second stator core teeth 32-2, and has a depth of the second depth d2.

[0036] The four W-phase slits 48-W1 to 48-W4 include a first W-phase lead-out slit 48-W1, a first W-phase lead-in slit 48-W2, a second W-phase lead-out slit 48-W3, and a second W-phase lead-in slit 48-W4. The first W-phase lead-out slit 48-W1 is formed in a portion of the outer peripheral wall 35 on the opposite side from the ninth stator core tooth 32-9, and has a first depth d1. The first W-phase lead-in slit 48-W2 is formed in a portion of the outer peripheral wall 35 on the opposite side from the twelfth stator core tooth 32-12, and has a first depth d1. The second W-phase lead-side slit 48-W3 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the third stator core teeth 32-3, and has a depth of the second depth d2. The second W-phase lead-side slit 48-W4 is formed in a portion of the outer peripheral wall 35 on the opposite side to the lead of the sixth stator core teeth 32-6, and has a depth of the second depth d2.

[0037] That is, the four V-phase slits 48-V1 to 48-V4 are formed in the same manner as the four U-phase slits 48-U1 to 48-U4. Furthermore, the lower insulator 25 is formed so that, when the lower insulator 25 is rotated 120 degrees around the rotation shaft 16, the four U-phase slits 48-U1 to 48-U4 of the rotated lower insulator 25 overlap with the four V-phase slits 48-V1 to 48-V4 of the lower insulator 25 before the rotation. Furthermore, the four W-phase slits 48-W1 to 48-W4 are formed in the same manner as the four U-phase slits 48-U1 to 48-U4. In addition, the lower insulator 25 is formed so that when the lower insulator 25 is rotated 240 (=120+120) degrees around the rotation axis 16, the four U-phase slits 48-U1 to 48-U4 of the rotated lower insulator 25 overlap with the four W-phase slits 48-W1 to 48-W4 of the lower insulator 25 before rotation.

[0038] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 48-U1 and the first U-phase inlet slit 48-U2 so that a portion of the first U-phase crossover wire 42-U1 is positioned outside the outer peripheral wall portion 35. The first U-phase crossover wire 42-U1 also contacts the bottom of the first U-phase output slit 48-U1 and the bottom of the first U-phase inlet slit 48-U2. The first U-phase crossover wire 42-U1 also follows the outer peripheral surface of the outer peripheral wall portion 35 so that the portion of the first U-phase crossover wire 42-U1 positioned outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 positioned outside the outer peripheral wall portion 35 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 35.

[0039] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 48-U3 and the second U-phase inlet slit 48-U4 so that a portion of the second U-phase crossover wire 42-U2 is positioned outside the outer wall portion 35. The second U-phase crossover wire 42-U2 also contacts the bottom of the second U-phase output slit 48-U3 and the bottom of the second U-phase inlet slit 48-U4. The second U-phase crossover wire 42-U2 also follows the outer peripheral surface of the outer wall portion 35 so that the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 35 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 35 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 35.

[0040] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 48-V1 and the first V-phase inlet slit 48-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer peripheral wall portion 35. The first V-phase crossover wire 42-V1 also contacts the bottom of the first V-phase outlet slit 48-V1 and the bottom of the first V-phase inlet slit 48-V2. The first V-phase crossover wire 42-V1 also follows the outer peripheral surface of the outer peripheral wall portion 35 so that the portion of the first V-phase crossover wire 42-V1 disposed outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 disposed outside the outer peripheral wall portion 35 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 35.

[0041] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 48-V3 and the second V-phase inlet slit 48-V4 so that a portion of the second V-phase crossover wire 42-V2 is positioned outside the outer peripheral wall portion 35. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase outlet slit 48-V3 and the bottom of the second V-phase inlet slit 48-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 35 so that the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 35 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 35.

[0042] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 48-W1 and the first W-phase inlet slit 48-W2 so that a portion of the first W-phase crossover wire 42-W1 is located outside the outer wall portion 35. The first W-phase crossover wire 42-W1 also contacts the bottom of the first W-phase output slit 48-W1 and the bottom of the first W-phase inlet slit 48-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer wall portion 35 so that the portion of the first W-phase crossover wire 42-W1 located outside the outer wall portion 35 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 located outside the outer wall portion 35 is located along a predetermined region of the outer peripheral surface of the outer wall portion 35.

[0043] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 48-W3 and the second W-phase inlet slit 48-W4 so that a portion of the second W-phase crossover wire 42-W2 is located outside the outer wall portion 35. The second W-phase crossover wire 42-W2 also contacts the bottom of the second W-phase output slit 48-W3 and the bottom of the second W-phase inlet slit 48-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer wall portion 35 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer wall portion 35 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer wall portion 35 is located along a predetermined region of the outer peripheral surface of the outer wall portion 35.

[0044] The lower insulator 25 further includes a plurality of ribs 49 corresponding to the plurality of crossover wires 42. Each of the plurality of ribs 49 protrudes outward from the outer peripheral surface of the outer peripheral wall portion 35. The rib corresponding to a certain crossover wire among the plurality of ribs 49 is disposed on the anti-lead side of the portion of that crossover wire disposed on the outer side of the outer peripheral wall portion 35 and is in contact with that portion. Therefore, the stator 22 can prevent the portion of the plurality of crossover wires 42 disposed on the outer side of the outer peripheral wall portion 35 from shifting toward the anti-lead side from a predetermined region of the outer peripheral surface of the outer peripheral wall portion 35.

[0045] In the motor 5, the outer peripheral wall portion 35 of the lower insulator 25 is formed in this manner, which allows the multiple crossover wires 42 to be spaced apart from one another, preventing the multiple crossover wires 42 from contacting one another and ensuring the mutual insulation of the multiple crossover wires 42. Furthermore, in the motor 5, the axial height of the outer peripheral wall portion 35 can be reduced by forming the multiple slits 48 of two types, namely, multiple slits with a first depth d1 and multiple slits with a second depth d2. In the first embodiment, the multiple slits 48 include two types of slits, namely, multiple slits with a first depth d1 and multiple slits with a second depth d2. The second depth d2 is shallower than the first depth d1. In the motor 5, the small height of the outer peripheral wall portion 35 allows the axial height of the stator 22 to be reduced, thereby reducing the axial height of the motor 5. In the compressor 1, the small height of the motor 5 allows the axial height of the compressor 1 to be reduced.

[0046] Stator 22 is manufactured by using an automatic winding machine to properly attach first U-phase conductor, second U-phase conductor, first V-phase conductor, second V-phase conductor, first W-phase conductor, and second W-phase conductor to stator core 23, to which lower insulator 25 and upper insulator 26 have been properly attached. The automatic winding machine is equipped with a U-phase conductor nozzle, a V-phase conductor nozzle, and a W-phase conductor nozzle. The U-phase conductor nozzle, the V-phase conductor nozzle, and the W-phase conductor nozzle are provided on the automatic winding machine so as to operate synchronously and interlock with one another. The U-phase conductor nozzle, V-phase conductor nozzle, and W-phase conductor nozzle are arranged so that when the U-phase conductor nozzle, V-phase conductor nozzle, and W-phase conductor nozzle are rotated 120 degrees around the central axis of the automatic winding machine, the U-phase conductor nozzle of the automatic winding machine after rotation overlaps the V-phase conductor nozzle of the automatic winding machine before rotation, the V-phase conductor nozzle of the automatic winding machine after rotation overlaps the W-phase conductor nozzle of the automatic winding machine before rotation, and the W-phase conductor nozzle of the automatic winding machine after rotation overlaps the U-phase conductor nozzle of the automatic winding machine before rotation.

[0047] First, stator core 23, to which lower insulator 25 and upper insulator 26 are appropriately attached, is set in the automatic winding machine so that the central axis of yoke portion 31 of stator core 23 coincides with the central axis of the automatic winding machine. After one end of the first U-phase conductor is positioned on the lead side of first stator core teeth portion 32-1, the automatic winding machine moves the U-phase conductor nozzle to wind the first U-phase conductor counterclockwise around first stator core teeth portion 32-1, thereby forming first U-phase power supply line 44-U1 and first U-phase winding 24-U1 from the first U-phase conductor. At this time, the automatic winding machine winds the first V-phase conductor counterclockwise around fifth stator core teeth portion 32-5 by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming first V-phase power supply conductor 44-V1 and first V-phase winding 24-V1 from the first V-phase conductor.The automatic winding machine further winds the first W-phase conductor counterclockwise around ninth stator core teeth portion 32-9 by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming first V-phase power supply conductor 44-V1 and first W-phase winding 24-W1 from the first W-phase conductor.

[0048] Next, the automatic winding machine moves the U-phase conductor nozzle to pass the first U-phase conductor through the first U-phase lead-out slit 48-U1 and the first U-phase lead-in slit 48-U2 in the outer peripheral wall portion 35 of the lower insulator 25, thereby forming the first U-phase crossover wire 42-U1 from the first U-phase conductor. At this time, the automatic winding machine operates the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle to pass the first V-phase conductor through the first V-phase lead-out slit 48-V1 and the first V-phase lead-in slit 48-V2, thereby forming the first V-phase crossover wire 42-V1 from the first V-phase conductor. The automatic winding machine further operates the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle to pass the first W-phase conductor through the first W-phase outlet slit 48-W1 and the first W-phase inlet slit 48-W2, thereby forming the first W-phase crossover wire 42-W1 from the first W-phase conductor.

[0049] Next, the automatic winding machine moves the U-phase conductor nozzle to wind the first U-phase conductor counterclockwise around fourth stator core tooth portion 32-4, place the other end of the first U-phase conductor on the lead side of fourth stator core tooth portion 32-4, and form second U-phase winding 24-U2 and first U-phase neutral conductor 43-U1 from the first U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can wind the first V-phase conductor counterclockwise around eighth stator core tooth portion 32-8, place the other end of the first V-phase conductor on the lead side of eighth stator core tooth portion 32-8, and form second V-phase winding 24-V2 and first V-phase neutral conductor 43-V1 from the first V-phase conductor. The automatic winding machine further winds the first W-phase conductor counterclockwise around the twelfth stator core teeth portion 32-12 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and places the other end of the first W-phase conductor on the lead side of the twelfth stator core teeth portion 32-12, thereby forming the second W-phase winding 24-W2 and the first W-phase neutral wire 43-W1 from the first W-phase conductor.

[0050] Next, after one end of the second U-phase conductor has been positioned on the lead side of seventh stator core tooth portion 32-7, the automatic winding machine moves the U-phase conductor nozzle to wind the second U-phase conductor counterclockwise around seventh stator core tooth portion 32-7, thereby forming second U-phase power supply conductor 44-U2 and third U-phase winding 24-U3 from the second U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can wind the second V-phase conductor counterclockwise around eleventh stator core tooth portion 32-11 after one end of the second V-phase conductor has been positioned on the lead side of eleventh stator core tooth portion 32-11, thereby forming second V-phase power supply conductor 44-V2 and third V-phase winding 24-V3 from the second V-phase conductor. Furthermore, by having the W-phase conductor nozzle operate in conjunction with the U-phase conductor nozzle, the automatic winding machine can wind the second W-phase conductor counterclockwise around the third stator core teeth portion 32-3 after one end of the second W-phase conductor is positioned on the lead side of the third stator core teeth portion 32-3, thereby forming the second W-phase power supply line 44-W2 and the third W-phase winding 24-W3 from the second W-phase conductor.

[0051] Next, the automatic winding machine moves the U-phase conductor nozzle to pass the second U-phase conductor through the second U-phase lead-out slit 48-U3 and the second U-phase lead-in slit 48-U4 in the outer peripheral wall portion 35 of the lower insulator 25, thereby forming the second U-phase crossover wire 42-U2 from the second V-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can pass the second V-phase conductor through the second V-phase lead-out slit 48-V3 and the second V-phase lead-in slit 48-V4 in the outer peripheral wall portion 35 of the lower insulator 25, thereby forming the second V-phase crossover wire 42-V2 from the second V-phase conductor. The automatic winding machine further operates the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle to pass the second W-phase conductor through the second W-phase lead-out side slit 48-W3 and the second W-phase lead-in side slit 48-W4 in the outer wall portion 35 of the lower insulator 25, thereby forming the second W-phase crossover wire 42-W2 from the second W-phase conductor.

[0052] Next, the automatic winding machine moves the U-phase conductor nozzle, winds the second U-phase conductor counterclockwise around tenth stator core tooth portion 32-10, places the other end of the second U-phase conductor on the lead side of tenth stator core tooth portion 32-10, and forms fourth U-phase winding 24-U4 and second U-phase neutral conductor 43-U2 from the second U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, winds the second V-phase conductor counterclockwise around second stator core tooth portion 32-2, places the other end of the second V-phase conductor on the lead side of second stator core tooth portion 32-2, and forms fourth V-phase winding 24-V4 and second V-phase neutral conductor 43-V2 from the second V-phase conductor. The automatic winding machine further winds the second W-phase conductor counterclockwise around the sixth stator core teeth portion 32-6 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and places the other end of the second W-phase conductor on the lead side of the sixth stator core teeth portion 32-6, thereby forming the fourth W-phase winding 24-W4 and the second W-phase neutral wire 43-W2 from the second W-phase conductor.

[0053] That is, the four U-phase slits 48-U1 to 48-U4, the four V-phase slits 48-V1 to 48-V4, and the four W-phase slits 48-W1 to 48-W4 have the same shapes, so that the stator 22 can be easily manufactured using an automatic winding machine. Even when the stator 22 is manufactured using such an automatic winding machine, the motor 5 can be made compact while preventing the multiple crossover wires 42 from contacting each other.

[0054] [Compressor 1 operation] The compressor 1 is provided, for example, in a refrigerant circuit (not shown). The motor 5 generates a rotating magnetic field in the space inside the stator 22 by appropriately supplying three-phase alternating current to the multiple windings 24 via the U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W. The rotor 21 rotates around the rotation axis 16 due to the rotating magnetic field generated by the stator 22. The rotation of the rotor 21 causes the shaft 3 to rotate around the rotation axis 16, and the rotation of the rotor 21 is transmitted to the compression unit 6. The rotation of the shaft 3 causes the compression unit 6 to suck low-pressure gas refrigerant from a device in the refrigerant circuit upstream of the compressor 1 via the suction pipe 11 and compress the sucked low-pressure gas refrigerant. The low-pressure gas refrigerant is compressed by the compression unit 6 to become high-pressure gas refrigerant. The compression unit 6 supplies the high-pressure gas refrigerant to the space between the compression unit 6 and the motor 5 in the internal space 7.

[0055] The high-pressure gas refrigerant supplied to the space in the internal space 7 between the compression unit 6 and the motor 5 passes through a gap formed in the motor 5 and is supplied to the space in the internal space 7 above the motor 5. The high-pressure gas refrigerant supplied to the space in the internal space 7 above the motor 5 is discharged via the discharge pipe 12 to a device in the refrigerant circuit downstream of the compressor 1. This operation of the compressor 1 causes the refrigerant to circulate in the refrigerant circuit.

[0056] [Motor of Comparative Example 1] As shown in FIG. 6, the stator 101 of the motor of Comparative Example 1 includes a stator core 23, a plurality of windings 24, and an upper insulator 26, similar to the stator 22 of the motor 5 described above, but the lower insulator 25 of the motor 5 is replaced with another lower insulator 102. FIG. 6 is a development view showing the stator 101 of the motor of Comparative Example 1. Similar to the lower insulator 25 described above, the lower insulator 102 includes a plurality of insulator teeth 36-1 to 36-12, and the outer peripheral wall 35 is replaced with another outer peripheral wall 103. A plurality of slits 104 are formed in the outer peripheral wall 103. The plurality of slits 104 include four U-phase slits 104-U1 to 104-U4, four V-phase slits 104-V1 to 104-V4, and four W-phase slits 104-W1 to 104-W4.

[0057] The first U-phase lead-side slit 104-U1 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the first stator core teeth 32-1, and has a first depth d1. The first U-phase lead-side slit 104-U2 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the fourth stator core teeth 32-4, and has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side slit 104-U3 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the seventh stator core teeth 32-7, and has a second depth d2. The second U-phase lead-in slit 104-U4 is formed in a portion of the outer wall portion 103 on the opposite side to the lead of the tenth stator core teeth portion 32-10, and has a depth of a third depth d3. The third depth d3 is shallower than the second depth d2.

[0058] The first V-phase lead-side slit 104-V1 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the second stator core tooth 32-2, and the depth of the first V-phase lead-side slit 104-V1 is formed to a first depth d1. The first V-phase lead-side slit 104-V2 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the fifth stator core tooth 32-5, and the depth of the first V-phase lead-side slit 104-V2 is formed to a second depth d2. The second V-phase lead-side slit 104-V3 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the eighth stator core tooth 32-8, and the depth of the second V-phase lead-side slit 104-V3 is formed to a second depth d2. The second V-phase lead-in side slit 104-V4 is formed in the portion of the outer wall portion 103 on the opposite lead side of the eleventh stator core teeth portion 32-11, and the depth of the second V-phase lead-in side slit 104-V4 is formed to a third depth d3.

[0059] The first W-phase lead-side slit 104-W1 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the sixth stator core tooth 32-6, and has a first depth d1. The first W-phase lead-side slit 104-W2 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the ninth stator core tooth 32-9, and has a second depth d2. The second W-phase lead-side slit 104-W3 is formed in a portion of the outer peripheral wall 103 on the opposite side to the lead of the twelfth stator core tooth 32-12, and has a second depth d2. The second W-phase retraction side slit 104-W4 is formed in the portion of the outer wall portion 103 on the opposite lead side of the third stator core teeth portion 32-3, and the depth of the second W-phase retraction side slit 104-W4 is formed to a third depth d3.

[0060] That is, the four V-phase slits 104-V1 to 104-V4 are formed in the same manner as the four U-phase slits 104-U1 to 104-U4. Furthermore, the lower insulator 25 is formed so that when the lower insulator 25 is rotated 30 degrees around the rotation axis 16, the four U-phase slits 104-U1 to 104-U4 of the rotated lower insulator 25 overlap with the four V-phase slits 104-V1 to 104-V4 of the lower insulator 25 before the rotation. Furthermore, the four W-phase slits 104-W1 to 104-W4 are formed in the same manner as the four U-phase slits 104-U1 to 104-U4. In addition, the lower insulator 25 is formed so that when the lower insulator 25 is rotated 150 (= 30 + 120) degrees around the rotation axis 16, the four U-phase slits 104-U1 to 104-U4 of the rotated lower insulator 25 overlap with the four W-phase slits 104-W1 to 104-W4 of the lower insulator 25 before rotation.

[0061] The motor of Comparative Example 1 also differs from the motor 5 of Example 1 in the combination of the windings 24 connected thereto. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 of the motor of Comparative Example 1 are arranged so that the multiple windings 24 are connected in adjacent poles.

[0062] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 48-U1 and the first U-phase input slit 48-U2 and contacts the bottom of the first U-phase output slit 48-U1 and the bottom of the first U-phase input slit 48-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 103 so that the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 103 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0063] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 48-U3 and the second U-phase input slit 48-U4 and contacts the bottom of the second U-phase output slit 48-U3 and the bottom of the second U-phase input slit 48-U4. The second U-phase crossover wire 42-U2 also follows the outer circumferential surface of the outer circumferential wall portion 103 so that the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 103 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0064] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 48-V1 and the first V-phase inlet slit 48-V2 and contacts the bottom of the first V-phase outlet slit 48-V1 and the bottom of the first V-phase inlet slit 48-V2. The first V-phase crossover wire 42-V1 also follows the outer circumferential surface of the outer circumferential wall portion 103 so that the portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 103 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0065] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 48-V3 and the second V-phase inlet slit 48-V4 and contacts the bottom of the second V-phase outlet slit 48-V3 and the bottom of the second V-phase inlet slit 48-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 103 so that the portion of the second V-phase crossover wire 42-V2 located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 located outside the outer peripheral wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0066] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 48-W1 and the first W-phase inlet slit 48-W2 and contacts the bottom of the first W-phase output slit 48-W1 and the bottom of the first W-phase inlet slit 48-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer peripheral wall portion 103 so that the portion of the first W-phase crossover wire 42-W1 located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 located outside the outer peripheral wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0067] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 48-W3 and the second W-phase inlet slit 48-W4 and contacts the bottom of the second W-phase output slit 48-W3 and the bottom of the second W-phase inlet slit 48-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer peripheral wall portion 103 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0068] The outer peripheral wall portion 103 of Comparative Example 1 has a plurality of slits 104 formed from three types of slits with different depths. This makes the height of the outer peripheral wall portion 103 greater than the height of the outer peripheral wall portion 35 of the motor 5 of Example 1 described above. That is, the height of the outer peripheral wall portion 35 of the motor 5 of Example 1 described above can be made smaller than that of the motor of Comparative Example 1, thereby reducing the height of the motor 5. Furthermore, the second V-phase crossover wire 42-V2 of the motor of Comparative Example 1 is close to the first W-phase crossover wire 42-W1, and there is a risk of contacting the first W-phase crossover wire 42-W1. That is, the motor 5 of Example 1 can separate the crossover wires 42 of different phases more widely than the motor of Comparative Example 1, thereby more reliably preventing the crossover wires 42 of different phases from contacting each other.

[0069] In the motor of Comparative Example 1, the depths of the second U-phase output slit 104-U3, the second V-phase output slit 104-V3, and the second W-phase output slit 104-W3 are set equal to the third depth d3, and the depths of the second U-phase input slit 104-U4, the second V-phase input slit 104-V4, and the second W-phase input slit 104-W4 are set equal to a fourth depth that is shallower than the third depth d3. This separates the second V-phase crossover wire 42-V2 from the first W-phase crossover wire 42-W1, preventing the second V-phase crossover wire 42-V2 from contacting the first W-phase crossover wire 42-W1, which is a crossover wire of a different phase. However, in this case, the motor of Comparative Example 1 has a plurality of slits 104 formed from four types of slits with different depths, which further increases the height of the outer wall portion 103.

[0070] [Motor of Comparative Example 2] As shown in FIG. 7, the stator 111 of the motor of Comparative Example 2 includes a stator core 23, a plurality of windings 24, and an upper insulator 26, similar to the stator 22 of the motor 5 described above, but the lower insulator 25 of the motor 5 is replaced with another lower insulator 112. FIG. 7 is a development view showing the stator 111 of the motor of Comparative Example 2. Similar to the lower insulator 25 described above, the lower insulator 112 includes a plurality of insulator teeth 36-1 to 36-12, and the outer peripheral wall 35 is replaced with another outer peripheral wall 113. A plurality of slits 114 are formed in the outer peripheral wall 113. The plurality of slits 114 include four U-phase slits 114-U1 to 114-U4, four V-phase slits 114-V1 to 114-V4, and four W-phase slits 114-W1 to 114-W4.

[0071] The first U-phase lead-side slit 114-U1 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the first stator core tooth 32-1, and has a first depth d1. The first U-phase lead-side slit 114-U2 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the fourth stator core tooth 32-4, and has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side slit 114-U3 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the seventh stator core tooth 32-7, and has a second depth d2. The second U-phase lead-in slit 114-U4 is formed in a portion of the outer wall portion 113 on the opposite side to the lead of the tenth stator core teeth portion 32-10, and has a depth of a third depth d3. The third depth d3 is shallower than the second depth d2.

[0072] The first V-phase lead-side slit 114-V1 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the fifth stator core tooth 32-5, and the depth of the first V-phase lead-side slit 114-V1 is formed to a first depth d1. The first V-phase lead-side slit 114-V2 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the eighth stator core tooth 32-8, and the depth of the first V-phase lead-side slit 114-V2 is formed to a second depth d2. The second V-phase lead-side slit 114-V3 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the eleventh stator core tooth 32-11, and the depth of the second V-phase lead-side slit 114-V3 is formed to a second depth d2. The second V-phase lead-in side slit 114-V4 is formed in the portion of the outer wall portion 113 on the opposite lead side of the second stator core teeth portion 32-2, and the depth of the second V-phase lead-in side slit 114-V4 is formed to a third depth d3.

[0073] The first W-phase lead-side slit 114-W1 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the third stator core tooth 32-3, and has a first depth d1. The first W-phase lead-side slit 114-W2 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the sixth stator core tooth 32-6, and has a second depth d2. The second W-phase lead-side slit 114-W3 is formed in a portion of the outer peripheral wall 113 on the opposite side to the lead of the ninth stator core tooth 32-9, and has a second depth d2. The second W-phase lead-in side slit 114-W4 is formed in the portion of the outer wall portion 113 on the opposite lead side of the twelfth stator core teeth portion 32-12, and the depth of the second W-phase lead-in side slit 114-W4 is formed to a third depth d3.

[0074] That is, the four V-phase slits 114-V1 to 114-V4 are formed in the same manner as the four U-phase slits 114-U1 to 114-U4. Furthermore, the lower insulator 112 is formed so that, when the lower insulator 112 is rotated 60 degrees around the rotation axis 16, the four U-phase slits 114-U1 to 114-U4 of the rotated lower insulator 112 overlap with the four V-phase slits 114-V1 to 114-V4 of the lower insulator 112 before the rotation. Furthermore, the four W-phase slits 114-W1 to 114-W4 are formed in the same manner as the four U-phase slits 114-U1 to 114-U4. In addition, the lower insulator 112 is formed so that when the lower insulator 112 is rotated 120 (=60+60) degrees around the rotation axis 16, the four U-phase slits 114-U1 to 114-U4 of the rotated lower insulator 112 overlap with the four W-phase slits 114-W1 to 114-W4 of the lower insulator 112 before rotation.

[0075] The motor of Comparative Example 2 also differs from the motor 5 of Example 1 in the combination of the windings 24 connected thereto. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 of the motor of Comparative Example 2 are arranged so that the multiple windings 24 are connected in adjacent poles.

[0076] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 48-U1 and the first U-phase input slit 48-U2 and contacts the bottom of the first U-phase output slit 48-U1 and the bottom of the first U-phase input slit 48-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 113 so that the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 113 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0077] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 48-U3 and the second U-phase input slit 48-U4 and contacts the bottom of the second U-phase output slit 48-U3 and the bottom of the second U-phase input slit 48-U4. The second U-phase crossover wire 42-U2 also follows the outer circumferential surface of the outer circumferential wall portion 113 so that the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 113 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0078] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 48-V1 and the first V-phase inlet slit 48-V2 and contacts the bottom of the first V-phase outlet slit 48-V1 and the bottom of the first V-phase inlet slit 48-V2. The first V-phase crossover wire 42-V1 also follows the outer circumferential surface of the outer circumferential wall portion 113 so that the portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 113 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0079] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 48-V3 and the second V-phase inlet slit 48-V4 and contacts the bottom of the second V-phase outlet slit 48-V3 and the bottom of the second V-phase inlet slit 48-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 113 so that the portion of the second V-phase crossover wire 42-V2 located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 located outside the outer peripheral wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0080] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 48-W1 and the first W-phase inlet slit 48-W2 and contacts the bottom of the first W-phase output slit 48-W1 and the bottom of the first W-phase inlet slit 48-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer peripheral wall 113 so that the portion of the first W-phase crossover wire 42-W1 located outside the outer peripheral wall 113 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 located outside the outer peripheral wall 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0081] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 48-W3 and the second W-phase input slit 48-W4 and contacts the bottom of the second W-phase output slit 48-W3 and the bottom of the second W-phase input slit 48-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer peripheral wall 113 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall 113 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0082] The outer peripheral wall portion 113 of Comparative Example 2 has a plurality of slits 114 formed from three types of slits with different depths. This makes the height of the outer peripheral wall portion 113 greater than the height of the outer peripheral wall portion 35 of the motor 5 of Example 1. That is, the height of the outer peripheral wall portion 35 of the motor 5 of Example 1 can be made smaller than that of the motor of Comparative Example 2, thereby making it possible to reduce the height of the motor 5. Furthermore, the second U-phase crossover wire 42-U2 of the motor of Comparative Example 2 is close to the first V-phase crossover wire 42-V1, and there is a risk of it contacting the first V-phase crossover wire 42-V1. That is, the motor 5 of Example 1 can separate the crossover wires 42 of different phases more widely than the motor of Comparative Example 2, thereby more reliably preventing the crossover wires 42 of different phases from contacting each other.

[0083] In the motor of Comparative Example 2, the depths of the second U-phase output slit 114-U3, the second V-phase output slit 114-V3, and the second W-phase output slit 114-W3 are set equal to the third depth d3, and the depths of the second U-phase lead-in slit 114-U4, the second V-phase lead-in slit 114-V4, and the second W-phase lead-in slit 114-W4 are set equal to a fourth depth that is shallower than the third depth d3. This separates the second U-phase crossover wire 42-U2 from the first V-phase crossover wire 42-V1, preventing the second U-phase crossover wire 42-U2 from contacting the first V-phase crossover wire 42-V1, which is a crossover wire of a different phase. However, in this case, the motor of Comparative Example 2 has a plurality of slits 114 formed from four types of slits with different depths, which further increases the height of the outer circumferential wall portion 113.

[0084] [Motor of Comparative Example 3] As shown in FIG. 8, the stator 121 of the motor of Comparative Example 3 includes a stator core 23, a plurality of windings 24, and an upper insulator 26, similar to the stator 22 of the motor 5 described above, but the lower insulator 25 of the motor 5 is replaced with another lower insulator 122. FIG. 8 is a development view showing the stator 121 of the motor of Comparative Example 3. Similar to the lower insulator 25 described above, the lower insulator 122 includes a plurality of insulator teeth 36-1 to 36-12, and the outer peripheral wall 35 is replaced with another outer peripheral wall 123. A plurality of slits 124 are formed in the outer peripheral wall 123. The plurality of slits 124 include four U-phase slits 124-U1 to 124-U4, four V-phase slits 124-V1 to 124-V4, and four W-phase slits 124-W1 to 124-W4.

[0085] The first U-phase lead-side slit 124-U1 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the first stator core tooth 32-1, and the depth of the first U-phase lead-side slit 124-U1 is formed to a first depth d1. The first U-phase lead-side slit 124-U2 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the fourth stator core tooth 32-4, and the depth of the first U-phase lead-side slit 124-U2 is formed to a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side slit 124-U3 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the seventh stator core tooth 32-7, and the depth of the second U-phase lead-side slit 124-U3 is formed to a second depth d2. The second U-phase lead-in slit 124-U4 is formed in a portion of the outer wall portion 123 on the opposite side to the lead of the tenth stator core teeth portion 32-10, and has a depth of a third depth d3. The third depth d3 is shallower than the second depth d2.

[0086] The first V-phase lead-side slit 124-V1 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the eighth stator core tooth 32-8, and has a first depth d1. The first V-phase lead-side slit 124-V2 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the eleventh stator core tooth 32-11, and has a second depth d2. The second V-phase lead-side slit 124-V3 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the second stator core tooth 32-2, and has a second depth d2. The second V-phase lead-in side slit 124-V4 is formed in the portion of the outer wall portion 123 on the opposite lead side of the fifth stator core teeth portion 32-5, and the depth of the second V-phase lead-in side slit 124-V4 is formed to be the third depth d3.

[0087] The first W-phase lead-side slit 124-W1 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the third stator core tooth 32-3, and has a first depth d1. The first W-phase lead-side slit 124-W2 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the sixth stator core tooth 32-6, and has a second depth d2. The second W-phase lead-side slit 124-W3 is formed in a portion of the outer peripheral wall 123 on the opposite side to the lead of the ninth stator core tooth 32-9, and has a second depth d2. The second W-phase lead-in side slit 124-W4 is formed in the portion of the outer wall portion 123 on the opposite lead side of the twelfth stator core teeth portion 32-12, and the depth of the second W-phase lead-in side slit 124-W4 is formed to a third depth d3.

[0088] That is, the four V-phase slits 124-V1 to 124-V4 are formed in the same manner as the four U-phase slits 124-U1 to 124-U4. Furthermore, the lower insulator 112 is formed such that, when the lower insulator 112 is rotated 210 degrees around the rotation axis 16, the four U-phase slits 124-U1 to 124-U4 of the rotated lower insulator 112 overlap with the four V-phase slits 124-V1 to 124-V4 of the lower insulator 112 before the rotation. Furthermore, the four W-phase slits 124-W1 to 124-W4 are formed in the same manner as the four U-phase slits 124-U1 to 124-U4. In addition, the lower insulator 112 is formed so that when the lower insulator 112 is rotated 60 degrees around the rotation axis 16, the four U-phase slits 124-U1 to 124-U4 of the rotated lower insulator 112 overlap with the four W-phase slits 124-W1 to 124-W4 of the lower insulator 112 before rotation.

[0089] The motor of Comparative Example 3 also differs from the motor 5 of Example 1 in the combination of the windings 24 connected together. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 of the motor of Comparative Example 3 are arranged so that the multiple windings 24 are connected in adjacent poles.

[0090] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 124-U1 and the first U-phase input slit 124-U2 and contacts the bottom of the first U-phase output slit 124-U1 and the bottom of the first U-phase input slit 124-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 123 so that the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 located outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0091] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 124-U3 and the second U-phase input slit 124-U4 and contacts the bottom of the second U-phase output slit 124-U3 and the bottom of the second U-phase input slit 124-U4. The second U-phase crossover wire 42-U2 also follows the outer circumferential surface of the outer circumferential wall portion 123 so that the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 located outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0092] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 124-V1 and the first V-phase inlet slit 124-V2 and is in contact with the bottom of the first V-phase outlet slit 124-V1 and the bottom of the first V-phase inlet slit 124-V2. The first V-phase crossover wire 42-V1 also follows the outer circumferential surface of the outer circumferential wall portion 123 so that a portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 located outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0093] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 124-V3 and the second V-phase inlet slit 124-V4 and contacts the bottom of the second V-phase outlet slit 124-V3 and the bottom of the second V-phase inlet slit 124-V4. The second V-phase crossover wire 42-V2 also follows the outer circumferential surface of the outer circumferential wall portion 123 so that the portion of the second V-phase crossover wire 42-V2 located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 located outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0094] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 124-W1 and the first W-phase input slit 124-W2 and contacts the bottom of the first W-phase output slit 124-W1 and the bottom of the first W-phase input slit 124-W2. The first W-phase crossover wire 42-W1 also follows the outer circumferential surface of the outer circumferential wall portion 123 so that the portion of the first W-phase crossover wire 42-W1 located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 located outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0095] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 124-W3 and the second W-phase input slit 124-W4 and contacts the bottom of the second W-phase output slit 124-W3 and the bottom of the second W-phase input slit 124-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer peripheral wall portion 123 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 123 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0096] The outer peripheral wall 123 has a plurality of slits 124 formed from three types of slits with different depths, and therefore the height of the outer peripheral wall 123 is greater than the height of the outer peripheral wall 35 of the motor 5 of Example 1. That is, the height of the outer peripheral wall 35 of the motor 5 of Example 1 can be made smaller than that of the motor of Comparative Example 3, and the height of the motor 5 can be made smaller.

[0097] [Effects of Motor 5 in Example 1] The motor 5 of the first embodiment includes a rotor 21 and a stator 22 that generates a magnetic field that rotates the rotor 21 around the rotating shaft 16. The stator 22 includes a stator core 23, an outer peripheral wall portion 35 of a cylindrical lower insulator 25, and a plurality of windings 24. The stator core 23 includes an annular yoke portion 31 that surrounds the outer peripheral side of the rotor 21, and a plurality of stator core teeth portions 32-1 to 32-12 that protrude from the inner peripheral side of the yoke portion 31 toward the rotor 21 and are aligned in the circumferential direction. The outer peripheral wall portion 35 is disposed at one end of the stator core 23 in the axial direction that is parallel to the rotating shaft 16. The plurality of windings 24 are formed by winding a conducting wire around each of the plurality of stator core teeth portions 32-1 to 32-12. The multiple windings 24 include four U-phase windings 24-U1 to 24-U4, four V-phase windings 24-V1 to 24-V4, and four W-phase windings 24-W1 to 24-W4, and are arranged so that two adjacent windings in the circumferential direction of the stator core 23 have different phases.

[0098] The stator 22 further includes two U-phase crossover wires 42-U1 to 42-U2 for the U-phase. The first U-phase crossover wire 42-U1, which is one of the two U-phase crossover wires 42-U1 to 42-U2, connects the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4. The second U-phase crossover wire 42-U2, which is the other U-phase crossover wire, connects the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4. The stator 22 also includes two crossover wires for each of the U and V phases, similar to the U-phase.

[0099] A plurality of slits 48 are formed in the outer peripheral wall 35 of the lower insulator 25. Crossover wires connected to the winding ends of the windings are drawn out through a plurality of lead-out slits among the plurality of slits 48. Crossover wires connected to the winding starts of the windings are drawn in through a plurality of lead-in slits among the plurality of slits 48. Each of the plurality of crossover wires 42 passes through two slits, a lead-out slit and a lead-in slit, formed in the outer peripheral wall 35 of the lower insulator 25, and a portion is disposed on the outer peripheral side of the outer peripheral wall 35. Furthermore, in each of the three phases, of the four slits, the lead-out slit of the first crossover wire, the lead-in slit of the first crossover wire, the lead-in slit of the second crossover wire, and the lead-in slit of the second crossover wire, at least two slits have the same depth.

[0100] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of the first embodiment, the four types of slits that hold the crossover wires do not all have to have different depths, and the axial height of the outer wall portion 35 can be reduced while ensuring the insulation distance between the crossover wires, thereby achieving both a compact motor 5 and ensuring insulation.

[0101] Furthermore, the portion of the crossover wire of the motor 5 of the first embodiment that is disposed on the outer peripheral side of the outer peripheral wall portion 35 of the lower insulator 25 is positioned in the axial direction by contacting the bottom of the slit. In the motor 5 of the first embodiment, even if a groove that fits into the crossover wire is not formed in the outer peripheral surface of the outer peripheral wall portion 35, the crossover wire can be disposed in a predetermined region of the outer peripheral surface of the outer peripheral wall portion 35.

[0102] The rotor 21 of the motor 5 of the first embodiment has eight poles so as to be suitable for the stator 22 having 12 coils in which coils of the same phase are arranged every three coils in the circumferential direction. In the first embodiment, one permanent magnet 39 is provided per pole, and the rotor 21 has eight permanent magnets 39 in total. Although not shown, one pole may have multiple permanent magnets 39, and for example, one pole may be configured by arranging two permanent magnets 39 in a V-shape.

[0103] The conductors forming the four U-phase windings 24-U1 to 24-U4 of the motor 5 in the first embodiment include a first U-phase series-connection portion 45-U1 and a second U-phase series-connection portion 45-U2. The first U-phase series-connection portion 45-U1 connects the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 in series. The second U-phase series-connection portion 45-U2 connects the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 in series. The first U-phase series-connection portion 45-U1 and the second U-phase series-connection portion 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. In the motor 5 of the first embodiment, the multiple windings 24 are connected in this manner, so that each phase has two crossover wires.

[0104] In addition, of both ends of the windings of motor 5 in Example 1, the end that is not connected to the jumper wire is connected to either the power line or the neutral line so that the series connection section is not formed from three or more windings.

[0105] Furthermore, in motor 5 of Example 1, the combination of the four slit depths is common to each of the three phases. In motor 5 of Example 1, in the winding process using an automatic winding machine that performs a pre-specified operation, the combination of the four slit depths is common to the three phases, which eliminates the need to change the operation for each phase, thereby simplifying the winding process.

[0106] Furthermore, in the motor 5 of Example 1, when the first U-phase winding 24-U1, the second U-phase winding 24-U2, the third U-phase winding 24-U3, and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are arranged in this order in the circumferential direction, the first U-phase crossover wire 42-U1, which is one of the two U-phase crossover wires 42-U1 to 42-U2, connects the first U-phase winding 24-U1 to the second U-phase winding 24-U2, and the second U-phase crossover wire 42-U2, which is the other U-phase crossover wire of the two U-phase crossover wires 42-U1 to 42-U2, connects the third U-phase winding 24-U3 to the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the windings 24 of the motor 5 of the first embodiment are connected in adjacent poles.

[0107] Furthermore, in motor 5 of the first embodiment, the four V-phase slits 48-V1 to 48-V4 are formed so that the shapes of the four U-phase slits 48-U1 to 48-U4 match the shapes of the four U-phase slits 48-W1 to 48-W4, and the shapes of the four W-phase slits 48-U1 to 48-W4 match the shapes of the four U-phase slits 48-U1 to 48-U4. That is, the multiple slits 48 are formed so that, when outer peripheral wall portion 35 of lower insulator 25 virtually rotates around rotation axis 16, the four U-phase slits 48-U1 to 48-U4 after rotation match the four V-phase slits 48-V1 to 48-V4 and the four W-phase slits 48-W1 to 48-W4 before rotation. In motor 5 of the first embodiment, multiple windings 24 corresponding to the three phases can be formed using three conductors supplied from three nozzles of an automatic winding machine, the operation of which is synchronized and linked.

[0108] Furthermore, in motor 5 of the first embodiment, the four U-phase slits 48-U1 to 48-U4 are formed so as to coincide with the four V-phase slits 48-V1 to 48-V4 when outer peripheral wall portion 35 of lower insulator 25 is rotated virtually 120 degrees in the circumferential direction about rotation shaft 16. Furthermore, in motor 5 of the first embodiment, the four U-phase slits 48-U1 to 48-U4 are formed so as to coincide with the four W-phase slits 48-W1 to 48-W4 when outer peripheral wall portion 35 of lower insulator 25 is rotated virtually 240 degrees in the circumferential direction about rotation shaft 16. In this case, motor 5 of the first embodiment can have two types of depth for the four U-phase slits 48-U1 to 48-U4.

[0109] In addition, in motor 5 of the first embodiment, two of the four U-phase slits 48-U1 to 48-U4 each have a first depth d1, and the other two U-phase slits each have a second depth d2 that is shallower than first depth d1. Four V-phase slits 48-V1 to 48-V4 and four W-phase slits 48-W1 to 48-W4 are formed in the same manner as four U-phase slits 48-U1 to 48-U4. In this case, motor 5 of the first embodiment can ensure an insulation distance between crossover wires of different phases by providing two different depths for the slits that hold the crossover wires, thereby reducing the axial height of outer peripheral wall portion 35 of lower insulator 25. This allows motor 5 to be miniaturized while maintaining sufficient insulation.

[0110] In the motor 5 of the first embodiment, the depths of the first U-phase lead-out slit 48-U1 and the first U-phase lead-in slit 48-U2 among the four U-phase slits 48-U1 to 48-U4 are both a first depth d1, and the depths of the second U-phase lead-out slit 48-U3 and the second U-phase lead-in slit 48-U4 are both a second depth d2 that is shallower than the first depth d1. The four V-phase slits 48-V1 to 48-V4 and the four W-phase slits 48-W1 to 48-W4 are also formed in the same manner as the four U-phase slits 48-U1 to 48-U4. In this case, when the arrangement interval between the three-phase slits is 120 degrees in adjacent pole connection, the motor 5 of the first embodiment can ensure insulation distance while reducing the number of slit depths to two, and can prevent crossover wires of different phases from riding over each other.

[0111] Furthermore, a plurality of ribs 49 are formed on the outer peripheral surface of the outer peripheral wall portion 35 of the lower insulator 25 of the motor 5 of the first embodiment. In this case, the motor 5 of the first embodiment can restrict the movement of the crossover wire in the axial direction. [Example]

[0112] As shown in FIG. 9, the motor of the second embodiment differs from the motor 5 of the first embodiment in the combination of the windings 24 connected thereto. FIG. 9 is a wiring diagram showing the connection state of the windings 24 of the motor of the second embodiment. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4.

[0113] That is, as shown in Fig. 10, the plurality of windings 24 are arranged in the circumferential direction so as to be connected in an alternate pole configuration. Fig. 10 is a development view showing a stator 22 of a motor of the second embodiment. That is, the plurality of windings 24 are arranged so that a winding of the same phase as two of the plurality of windings 24 connected in series is located between those two windings in the circumferential direction. For example, the four U-phase windings 24-U1 to 24-U4 are arranged so that the second U-phase winding 24-U2, which is a winding of the same phase, is located between the first U-phase winding 24-U1 and the third U-phase winding 24-U3 that constitute the first U-phase series-connected unit 45-U1.

[0114] In the motor of the second embodiment, the lower insulator 25 of the motor 5 of the first embodiment is further replaced with another lower insulator 51. The lower insulator 51 has a plurality of insulator teeth 36-1 to 36-12, similar to the lower insulator 25, and the outer peripheral wall 35 of the lower insulator 25 is replaced with another outer peripheral wall 52. The outer peripheral wall 52 has a plurality of slits 54 formed from the lower end of the outer peripheral wall 52 toward the stator core 23. The plurality of slits 54 include four U-phase slits 54-U1 to 54-U4, four V-phase slits 54-V1 to 54-V4, and four W-phase slits 54-W1 to 54-W4.

[0115] The four U-phase slits 54-U1 to 54-U4 include a first U-phase lead-out slit 54-U1, a first U-phase lead-in slit 54-U2, a second U-phase lead-out slit 54-U3, and a second U-phase lead-in slit 54-U4. The first U-phase lead-out slit 54-U1 is formed in a portion of the outer peripheral wall 52 on the opposite side from the first stator core teeth 32-1, and has a first depth d1. The first U-phase lead-in slit 54-U2 is formed in a portion of the outer peripheral wall 52 on the opposite side from the seventh stator core teeth 32-7, and has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-out slit 54-U3 is formed in a portion of the outer wall 52 opposite the lead of the fourth stator core teeth 32-4, and has a second depth d2. The second U-phase lead-in slit 54-U4 is formed in a portion of the outer wall 52 opposite the lead of the tenth stator core teeth 32-10, and has a third depth d3. The third depth d3 is shallower than the second depth d2.

[0116] The four V-phase slits 54-V1 to 54-V4 include a first V-phase lead-out slit 54-V1, a first V-phase lead-in slit 54-V2, a second V-phase lead-out slit 54-V3, and a second V-phase lead-in slit 54-V4. The first V-phase lead-out slit 54-V1 is formed in a portion of the outer peripheral wall 52 on the opposite side from the fifth stator core teeth 32-5, and the depth of the first V-phase lead-out slit 54-V1 is formed to a first depth d1. The first V-phase lead-in slit 54-V2 is formed in a portion of the outer peripheral wall 52 on the opposite side from the eleventh stator core teeth 32-11, and the depth of the first V-phase lead-in slit 54-V2 is formed to a second depth d2. The second V-phase lead-side slit 54-V3 is formed in a portion of the outer peripheral wall 52 on the opposite side to the lead of the eighth stator core tooth 32-8, and has a second depth d2. The second V-phase lead-side slit 54-V4 is formed in a portion of the outer peripheral wall 52 on the opposite side to the lead of the second stator core tooth 32-2, and has a third depth d3.

[0117] The four W-phase slits 54-W1 to 54-W4 include a first W-phase lead-out slit 54-W1, a first W-phase lead-in slit 54-W2, a second W-phase lead-out slit 54-W3, and a second W-phase lead-in slit 54-W4. The first W-phase lead-out slit 54-W1 is formed in a portion of the outer peripheral wall 52 on the opposite side from the lead of the ninth stator core tooth 32-9, and has a first depth d1. The first W-phase lead-in slit 54-W2 is formed in a portion of the outer peripheral wall 52 on the opposite side from the lead of the third stator core tooth 32-3, and has a second depth d2. The second W-phase lead-side slit 54-W3 is formed in a portion of the outer peripheral wall 52 on the opposite side to the lead of the twelfth stator core teeth 32-12, and has a second depth d2. The second W-phase lead-side slit 54-W4 is formed in a portion of the outer peripheral wall 52 on the opposite side to the lead of the sixth stator core teeth 32-6, and has a third depth d3.

[0118] That is, the four V-phase slits 54-V1 to 54-V4 are formed in the same manner as the four U-phase slits 54-U1 to 54-U4. Furthermore, the lower insulator 25 is formed such that, when the lower insulator 25 is rotated 120 degrees around the rotation shaft 16, the four U-phase slits 54-U1 to 54-U4 of the rotated lower insulator 25 overlap with the four V-phase slits 54-V1 to 54-V4 of the lower insulator 25 before the rotation. Furthermore, the four W-phase slits 54-W1 to 54-W4 are formed in the same manner as the four U-phase slits 54-U1 to 54-U4. In addition, the lower insulator 25 is formed so that when the lower insulator 25 is rotated 240 (=120+120) degrees around the rotation axis 16, the four U-phase slits 54-U1 to 54-U4 of the rotated lower insulator 25 overlap with the four W-phase slits 54-W1 to 54-W4 of the lower insulator 25 before rotation.

[0119] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 54-U1 and the first U-phase inlet slit 54-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 52. The first U-phase crossover wire 42-U1 also contacts the bottom of the first U-phase output slit 54-U1 and the bottom of the first U-phase inlet slit 54-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 52 so that the portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 52 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 52 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0120] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 54-U3 and the second U-phase input slit 54-U4 so that a portion of the second U-phase crossover wire 42-U2 is positioned outside the outer wall portion 52. The second U-phase crossover wire 42-U2 also contacts the bottom of the second U-phase output slit 54-U3 and the bottom of the second U-phase input slit 54-U4. The second U-phase crossover wire 42-U2 also follows the outer peripheral surface of the outer wall portion 52 so that the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 52 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 52 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 52.

[0121] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 54-V1 and the first V-phase inlet slit 54-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer wall portion 52. The first V-phase crossover wire 42-V1 also contacts the bottom of the first V-phase outlet slit 54-V1 and the bottom of the first V-phase inlet slit 54-V2. The first V-phase crossover wire 42-V1 also follows the outer peripheral surface of the outer wall portion 52 so that the portion of the first V-phase crossover wire 42-V1 disposed outside the outer wall portion 52 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 disposed outside the outer wall portion 52 is disposed along a predetermined region of the outer peripheral surface of the outer wall portion 52.

[0122] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 54-V3 and the second V-phase inlet slit 54-V4 so that a portion of the second V-phase crossover wire 42-V2 is disposed outside the outer wall portion 52. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase outlet slit 54-V3 and the bottom of the second V-phase inlet slit 54-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer wall portion 52 so that the portion of the second V-phase crossover wire 42-V2 disposed outside the outer wall portion 52 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 disposed outside the outer wall portion 52 is disposed along a predetermined region of the outer peripheral surface of the outer wall portion 52.

[0123] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 54-W1 and the first W-phase inlet slit 54-W2 so that a portion of the first W-phase crossover wire 42-W1 is positioned outside the outer wall portion 52. The first W-phase crossover wire 42-W1 also contacts the bottom of the first W-phase output slit 54-W1 and the bottom of the first W-phase inlet slit 54-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer wall portion 52 so that the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 52 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 52 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 52.

[0124] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 54-W3 and the second W-phase inlet slit 54-W4 so that a portion of the second W-phase crossover wire 42-W2 is positioned outside the outer wall portion 52. The second W-phase crossover wire 42-W2 also contacts the bottom of the second W-phase output slit 54-W3 and the bottom of the second W-phase inlet slit 54-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer wall portion 52 so that the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 52 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 52 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 52.

[0125] The lower insulator 25 further includes a plurality of ribs 55 corresponding to the plurality of crossover wires 42. Each of the plurality of ribs 55 protrudes outward from the outer peripheral surface of the outer peripheral wall portion 52. A rib among the plurality of ribs 55 corresponding to a certain crossover wire is disposed on the anti-lead side of a portion of that crossover wire that is disposed on the outer side of the outer peripheral wall portion 52, and is in contact with that portion. Therefore, the stator 22 can prevent the portion of the plurality of crossover wires 42 that is disposed on the outer side of the outer peripheral wall portion 52 from shifting toward the anti-lead side from a predetermined region of the outer peripheral surface of the outer peripheral wall portion 52.

[0126] The stator 22 is provided with two U-phase crossover wires 42-U1 to 42-U2 for the U-phase. One of the two U-phase crossover wires 42-U1 to 42-U2, the first U-phase crossover wire 42-U1, connects the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4. The other U-phase crossover wire, the second U-phase crossover wire 42-U2, connects the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4. The stator 22 is also provided with two crossover wires for each of the U and V phases, similar to the U-phase.

[0127] A plurality of slits 54 are formed in the outer peripheral wall 35 of the lower insulator 25. Crossover wires connected to the winding ends of the windings are drawn out through a plurality of the draw-side slits among the plurality of slits 54. Crossover wires connected to the winding starts of the windings are drawn in through a plurality of the lead-side slits among the plurality of slits 54. Each of the plurality of crossover wires 42 passes through two slits, a draw-side slit and a lead-side slit, formed in the outer peripheral wall 35 of the lower insulator 25, and a portion is disposed on the outer peripheral side of the outer peripheral wall 35. Furthermore, in each of the three phases, of the four slits, the draw-side slit of the first crossover wire, the lead-side slit of the first crossover wire, the draw-side slit of the second crossover wire, and the lead-side slit of the second crossover wire, at least two slits have the same depth.

[0128] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of Example 2, the depths of the four types of slits that hold the crossover wires do not all need to be different, and the axial height of the outer wall portion 35 can be reduced while ensuring the insulation distance between the crossover wires, thereby achieving both a compact motor 5 and ensuring insulation.

[0129] The conductors forming the four U-phase windings 24-U1 to 24-U4 of the motor 5 in the second embodiment include a first U-phase series-connection portion 45-U1 and a second U-phase series-connection portion 45-U2. The first U-phase series-connection portion 45-U1 connects the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 in series. The second U-phase series-connection portion 45-U2 connects the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 in series. The first U-phase series-connection portion 45-U1 and the second U-phase series-connection portion 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. In the motor 5 of the second embodiment, the multiple windings 24 are connected in this manner, so that each phase has two crossover wires.

[0130] Furthermore, in the motor 5 of Example 2, when the first U-phase winding 24-U1, the second U-phase winding 24-U2, the third U-phase winding 24-U3, and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are arranged in this order in the circumferential direction, the first U-phase crossover wire 42-U1, which is one of the two U-phase crossover wires 42-U1 to 42-U2, connects the first U-phase winding 24-U1 to the third U-phase winding 24-U3, and the second U-phase crossover wire 42-U2, which is the other U-phase crossover wire of the two U-phase crossover wires 42-U1 to 42-U2, connects the second U-phase winding 24-U2 to the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 of the motor 5 of the first embodiment are connected in an alternate pole manner.

[0131] Furthermore, motor 5 of Example 2 is formed so that the four U-phase slits 54-U1 to 54-U4 coincide with the four V-phase slits 54-V1 to 54-V4 when outer peripheral wall portion 35 of lower insulator 25 is rotated virtually 120 degrees in the circumferential direction about rotation shaft 16. Motor 5 of Example 1 is further formed so that the four U-phase slits 54-U1 to 54-U4 coincide with the four W-phase slits 54-W1 to 54-W4 when outer peripheral wall portion 35 of lower insulator 25 is rotated virtually 240 degrees in the circumferential direction about rotation shaft 16. In this case, motor 5 of Example 2 can have three different depths for the four U-phase slits 54-U1 to 54-U4.

[0132] Furthermore, in motor 5 of the second embodiment, two U-phase slits (54-U2, 54-U3) of the four U-phase slits 54-U1 to 54-U4 have the same depth (second depth d2). The four V-phase slits 54-V1 to 54-V4 and the four W-phase slits 54-W1 to 54-W4 are also formed in the same manner as the four U-phase slits 54-U1 to 54-U4. In this case, motor 5 of the second embodiment ensures an insulation distance between crossover wires of different phases, while providing three different depths for the slits that hold the crossover wires, thereby reducing the axial height of outer peripheral wall portion 35 of lower insulator 25. This allows motor 5 to be miniaturized while maintaining sufficient insulation.

[0133] Furthermore, in the motor 5 of the second embodiment, the depth of the second U-phase outlet slit 54-U3 and the depth of the first U-phase inlet slit 54-U2 among the four U-phase slits 54-U1 to 54-U4 are all the same depth (second depth d2). The four V-phase slits 54-V1 to 54-V4 and the four W-phase slits 54-W1 to 54-W4 are also formed in the same manner as the four U-phase slits 54-U1 to 54-U4. In this case, in the motor 5 of the second embodiment, when the arrangement interval between the three-phase slits is 120 degrees in an isolated pole connection, the number of slit depths can be reduced to three, while still ensuring insulation distance and preventing crossover wires of different phases from riding over each other.

[0134] By being configured in this manner, the motor of Example 2 can ensure the mutual insulation of the multiple crossover wires 42, similar to the motor 5 of Example 1 described above. Furthermore, the motor of Example 2 can reduce the axial height of the outer peripheral wall portion 52 by forming the multiple slits 54 from three types of slits: multiple slits with a first depth d1, multiple slits with a second depth d2, and multiple slits with a third depth d3. The motor of Example 2 can reduce its axial height by virtue of the small height of the outer peripheral wall portion 52. A compressor provided with the motor of Example 2 can reduce its axial height by virtue of the small height of the motor of Example 2. [Example]

[0135] As shown in FIG. 11, the motor of the third embodiment differs from the motor 5 of the first embodiment in the combination of the windings 24 connected thereto. FIG. 11 is a wiring diagram showing the connection state of the windings 24 of the motor of the third embodiment. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 are arranged in the circumferential direction so that the multiple windings 24 are connected to adjacent poles, as shown in Fig. 12. Fig. 12 is a development view showing the stator 22 of the motor of the third embodiment.

[0136] As shown in Fig. 12, which will be described later, the first U-phase power supply line 44-U1 and the second U-phase power supply line 44-U2 are routed in a connected state during the winding process, and then, after the winding process, the first U-phase power supply line 44-U1 and the second U-phase power supply line 44-U2 are separated, with both ends of the separated power supply line connected to the U-phase power supply, as shown in Fig. 11. The first V-phase power supply line 44-V1 and the second V-phase power supply line 44-V2 are routed in a connected state during the winding process, and then, after the winding process, the first V-phase power supply line 44-V1 and the second V-phase power supply line 44-V2 are separated, with both ends of the separated power supply connected to the V-phase power supply, as shown in Fig. 11. The first W-phase power line 44-W1 and the second W-phase power line 44-W2 are routed in a connected state during the winding process, and then, after the winding process, as shown in FIG. 11, the first W-phase power line 44-W1 and the second W-phase power line 44-W2 are separated, and both ends of the separated lines are connected to a W-phase power supply.

[0137] The stator of the motor of the third embodiment further includes a U-phase connecting wire 60-U, a V-phase connecting wire 60-V, and a W-phase connecting wire 60-W. The second U-phase winding 24-U2 and the first U-phase power supply wire 44-U1 are connected via the U-phase connecting wire 60-U. The second V-phase winding 24-V2 and the first V-phase power supply wire 44-V1 are connected via the V-phase connecting wire 60-V. The second W-phase winding 24-W2 and the first W-phase power supply wire 44-W1 are connected via the W-phase connecting wire 60-W.

[0138] 12, in the motor of the third embodiment, the lower insulator 25 of the motor 5 of the first embodiment is further replaced with another lower insulator 61. The lower insulator 61 has a plurality of insulator teeth 36-1 to 36-12, similar to the lower insulator 25, and the outer peripheral wall 35 of the lower insulator 25 is replaced with another outer peripheral wall 62. The outer peripheral wall 62 has a plurality of slits 64 formed therein, extending from a lower end of the outer peripheral wall 62 opposite the stator core 23 toward the stator core 23. The plurality of slits 64 include six U-phase slits 64-U1 to 64-U6, six V-phase slits 64-V1 to 64-V6, and six W-phase slits 64-W1 to 64-W6.

[0139] The six U-phase slits 64-U1 to 64-U6 include a first U-phase lead-out slit 64-U1, a first U-phase lead-in slit 64-U2, a second U-phase lead-out slit 64-U3, a second U-phase lead-in slit 64-U4, a U-phase connecting line lead-out slit 64-U5, and a U-phase connecting line lead-in slit 64-U6. The first U-phase lead-out slit 64-U1 is formed in a portion of the outer peripheral wall 62 on the opposite side from the first stator core teeth 32-1, and has a depth of 1st depth d1. The first U-phase lead-in slit 64-U2 is formed in a portion of the outer peripheral wall 62 on the opposite side from the fourth stator core teeth 32-4, and has a depth of 1st depth d1. The second U-phase lead-out slit 64-U3 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the seventh stator core tooth 32-7, and the depth of the second U-phase lead-out slit 64-U3 is formed to a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-in slit 64-U4 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the tenth stator core tooth 32-10, and the depth of the second U-phase lead-in slit 64-U4 is formed to a second depth d2. The U-phase connecting wire lead-out slit 64-U5 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the fourth stator core tooth 32-4, and the depth of the U-phase connecting wire lead-out slit 64-U5 is formed to a third depth d3. In the third embodiment, the third depth d3 is shallower than the first depth d1 and deeper than the second depth d2. The U-phase connecting wire inlet side slit 64-U6 is formed in the portion of the outer wall portion 62 on the opposite lead side of the seventh stator core teeth portion 32-7, and the depth of the U-phase connecting wire inlet side slit 64-U6 is formed to a third depth d3.

[0140] The six V-phase slits 64-V1 to 64-V6 include a first V-phase outlet slit 64-V1, a first V-phase inlet slit 64-V2, a second V-phase outlet slit 64-V3, a second V-phase inlet slit 64-V4, a V-phase connecting wire outlet slit 64-V5, and a V-phase connecting wire inlet slit 64-V6. The first V-phase outlet slit 64-V1 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the fifth stator core teeth 32-5, and the depth of the first V-phase outlet slit 64-V1 is formed to a first depth d1. The first V-phase inlet slit 64-V2 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the eighth stator core teeth 32-8, and the depth of the first V-phase inlet slit 64-V2 is formed to a first depth d1. The second V-phase lead-out slit 64-V3 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the eleventh stator core tooth 32-11, and the depth of the second V-phase lead-out slit 64-V3 is formed to a second depth d2. The second V-phase lead-in slit 64-V4 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the second stator core tooth 32-2, and the depth of the second V-phase lead-in slit 64-V4 is formed to a second depth d2. The V-phase connecting wire lead-out slit 64-V5 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the eighth stator core tooth 32-8, and the depth of the V-phase connecting wire lead-out slit 64-V5 is formed to a third depth d3. The V-phase connecting wire inlet side slit 64-V6 is formed in the portion of the outer wall portion 62 on the opposite side to the lead of the 11th stator core teeth portion 32-11, and the depth of the V-phase connecting wire inlet side slit 64-V6 is formed to a third depth d3.

[0141] The six W-phase slits 64-W1 to 64-W6 include a first W-phase lead-out slit 64-W1, a first W-phase lead-in slit 64-W2, a second W-phase lead-out slit 64-W3, a second W-phase lead-in slit 64-W4, a W-phase connecting wire lead-out slit 64-W5, and a W-phase connecting wire lead-in slit 64-W6. The first W-phase lead-out slit 64-W1 is formed in a portion of the outer peripheral wall 62 on the opposite side from the ninth stator core tooth 32-9, and has a first depth d1. The first W-phase lead-in slit 64-W2 is formed in a portion of the outer peripheral wall 62 on the opposite side from the twelfth stator core tooth 32-12, and has a first depth d1. The second W-phase lead-out slit 64-W3 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the third stator core tooth 32-3, and the depth of the second W-phase lead-out slit 64-W3 is formed to the second depth d2. The second W-phase lead-in slit 64-W4 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the sixth stator core tooth 32-6, and the depth of the second W-phase lead-in slit 64-W4 is formed to the second depth d2. The W-phase connecting wire lead-out slit 64-W5 is formed in a portion of the outer peripheral wall 62 on the opposite side to the lead of the twelfth stator core tooth 32-12, and the depth of the W-phase connecting wire lead-out slit 64-W5 is formed to the third depth d3. The W-phase connecting wire inlet side slit 64-W6 is formed in the portion of the outer wall portion 62 on the opposite lead side of the third stator core teeth portion 32-3, and the depth of the W-phase connecting wire inlet side slit 64-W6 is formed to a third depth d3.

[0142] That is, the six V-phase slits 64-V1 to 64-V6 are formed in the same manner as the six U-phase slits 64-U1 to 64-U6. Furthermore, the lower insulator 25 is formed so that, when the lower insulator 25 is rotated 120 degrees around the rotation shaft 16, the six U-phase slits 64-U1 to 64-U6 of the rotated lower insulator 25 overlap with the six V-phase slits 64-V1 to 64-V6 of the lower insulator 25 before the rotation. Furthermore, the six W-phase slits 64-W1 to 64-W6 are formed in the same manner as the six U-phase slits 64-U1 to 64-U6. In addition, the lower insulator 25 is formed so that when the lower insulator 25 is rotated 240 (=120+120) degrees around the rotation axis 16, the six U-phase slits 64-U1 to 64-U6 of the rotated lower insulator 25 overlap with the six W-phase slits 64-W1 to 64-W6 of the lower insulator 25 before rotation.

[0143] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 64-U1 and the first U-phase inlet slit 64-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 62. The first U-phase crossover wire 42-U1 also contacts the bottom of the first U-phase output slit 64-U1 and the bottom of the first U-phase inlet slit 64-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 62 so that the portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 62 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0144] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 64-U3 and the second U-phase input slit 64-U4 so that a portion of the second U-phase crossover wire 42-U2 is positioned outside the outer wall portion 62. The second U-phase crossover wire 42-U2 also contacts the bottom of the second U-phase output slit 64-U3 and the bottom of the second U-phase input slit 64-U4. The second U-phase crossover wire 42-U2 also follows the outer peripheral surface of the outer wall portion 62 so that the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 62 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 62 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 62.

[0145] The U-phase connecting wire 60-U passes through the U-phase connecting wire lead-out slit 64-U5 and the U-phase connecting wire lead-in slit 64-U6 so that a portion of the U-phase connecting wire 60-U is positioned outside the outer wall portion 62. The U-phase connecting wire 60-U also contacts the bottom of the U-phase connecting wire lead-out slit 64-U5 and the bottom of the U-phase connecting wire lead-in slit 64-U6. The U-phase connecting wire 60-U also follows the outer peripheral surface of the outer wall portion 62 so that the portion of the U-phase connecting wire 60-U positioned outside the outer wall portion 62 does not sag. Therefore, the portion of the U-phase connecting wire 60-U positioned outside the outer wall portion 62 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 62.

[0146] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 64-V1 and the first V-phase inlet slit 64-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 62. The first V-phase crossover wire 42-V1 also contacts the bottom of the first V-phase outlet slit 64-V1 and the bottom of the first V-phase inlet slit 64-V2. The first V-phase crossover wire 42-V1 also follows the outer circumferential surface of the outer circumferential wall portion 62 so that the portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 62 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0147] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 64-V3 and the second V-phase inlet slit 64-V4 so that a portion of the second V-phase crossover wire 42-V2 is disposed outside the outer wall portion 62. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase outlet slit 64-V3 and the bottom of the second V-phase inlet slit 64-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 62 so that the portion of the second V-phase crossover wire 42-V2 disposed outside the outer peripheral wall portion 62 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 disposed outside the outer peripheral wall portion 62 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 62.

[0148] The V-phase connecting wire 60-V passes through the V-phase connecting wire lead-out slit 64-V5 and the V-phase connecting wire lead-in slit 64-V6 so that a portion of the V-phase connecting wire 60-V is positioned outside the outer peripheral wall 62. The V-phase connecting wire 60-V also contacts the bottom of the V-phase connecting wire lead-out slit 64-V5 and the bottom of the V-phase connecting wire lead-in slit 64-V6. The V-phase connecting wire 60-V also follows the outer peripheral surface of the outer peripheral wall 62 so that the portion of the V-phase connecting wire 60-V positioned outside the outer peripheral wall 62 does not sag. Therefore, the portion of the V-phase connecting wire 60-V positioned outside the outer peripheral wall 62 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall 62.

[0149] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 64-W1 and the first W-phase inlet slit 64-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer wall portion 62. The first W-phase crossover wire 42-W1 also contacts the bottom of the first W-phase output slit 64-W1 and the bottom of the first W-phase inlet slit 64-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer peripheral wall portion 62 so that the portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer peripheral wall portion 62 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer peripheral wall portion 62 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 62.

[0150] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 64-W3 and the second W-phase inlet slit 64-W4 so that a portion of the second W-phase crossover wire 42-W2 is located outside the outer wall portion 62. The second W-phase crossover wire 42-W2 also contacts the bottom of the second W-phase output slit 64-W3 and the bottom of the second W-phase inlet slit 64-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer wall portion 62 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer wall portion 62 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer wall portion 62 is located along a predetermined region of the outer peripheral surface of the outer wall portion 62.

[0151] The W-phase connecting wire 60-W passes through the W-phase connecting wire lead-out slit 64-W5 and the W-phase connecting wire lead-in slit 64-W6 so that a portion of the W-phase connecting wire 60-W is positioned outside the outer peripheral wall 62. The W-phase connecting wire 60-W also contacts the bottom of the W-phase connecting wire lead-out slit 64-W5 and the bottom of the W-phase connecting wire lead-in slit 64-W6. The W-phase connecting wire 60-W also follows the outer peripheral surface of the outer peripheral wall 62 so that the portion of the W-phase connecting wire 60-W positioned outside the outer peripheral wall 62 does not sag. Therefore, the portion of the W-phase connecting wire 60-W positioned outside the outer peripheral wall 62 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall 62.

[0152] The motor of the third embodiment is configured in this manner, so that the multiple crossover wires 42, the U-phase connecting wire 60-U, the V-phase connecting wire 60-V, and the W-phase connecting wire 60-W can be separated from one another, preventing contact between the multiple crossover wires 42, the U-phase connecting wire 60-U, the V-phase connecting wire 60-V, and the W-phase connecting wire 60-W. Furthermore, the motor of the third embodiment has the multiple slits 64 formed from three types of slits: multiple slits with a first depth d1, multiple slits with a second depth d2, and multiple slits with a third depth d3. This allows the axial height of the outer peripheral wall portion 62 to be reduced. The motor of the third embodiment has a reduced height due to the reduced height of the outer peripheral wall portion 62. A compressor equipped with the motor of the third embodiment can have a reduced axial height due to the reduced height of the motor of the third embodiment.

[0153] The stator of the motor of Example 3 can be manufactured using an automatic winding machine, similar to the stator 22 of the motor 5 of Example 1 described above. That is, first, the stator core 23, to which the lower insulator 61 and the upper insulator 26 are attached, is set in the automatic winding machine so that the central axis of the yoke portion 31 of the stator core 23 overlaps the central axis of the automatic winding machine. After one end of the U-phase conductor is arranged on the lead side of the first stator core teeth portion 32-1, the automatic winding machine moves the U-phase conductor nozzle to wind the U-phase conductor counterclockwise around the first stator core teeth portion 32-1, thereby forming the first U-phase neutral conductor 43-U1 and the first U-phase winding 24-U1 from the U-phase conductor. At this time, the automatic winding machine winds the V-phase conductor counterclockwise around fifth stator core teeth portion 32-5 by using the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming first V-phase neutral conductor 43-V1 and first V-phase winding 24-V1 from the V-phase conductor. The automatic winding machine winds the W-phase conductor counterclockwise around ninth stator core teeth portion 32-9 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming first V-phase neutral conductor 43-V1 and first W-phase winding 24-W1 from the W-phase conductor.

[0154] Next, the automatic winding machine moves the U-phase conductor nozzle to pass the U-phase conductor through the first U-phase lead-out slit 64-U1 and the first U-phase lead-in slit 64-U2 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the first U-phase crossover wire 42-U1 from the U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can pass the V-phase conductor through the first V-phase lead-out slit 64-V1 and the first V-phase lead-in slit 64-V2 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the first V-phase crossover wire 42-V1 from the V-phase conductor. The automatic winding machine further enables the W-phase conductor nozzle to operate in conjunction with the U-phase conductor nozzle, passing the W-phase conductor through the first W-phase outlet slit 64-W1 and the first W-phase inlet slit 64-W2 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the first W-phase crossover wire 42-W1 from the W-phase conductor.

[0155] Next, the automatic winding machine moves the U-phase conductor nozzle and winds the U-phase conductor counterclockwise around the fourth stator core tooth portion 32-4, thereby forming the second U-phase winding 24-U2 from the U-phase conductor. At this time, the automatic winding machine winds the V-phase conductor counterclockwise around the eighth stator core tooth portion 32-8, thereby forming the second V-phase winding 24-V2 from the V-phase conductor, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle. The automatic winding machine further winds the W-phase conductor counterclockwise around the twelfth stator core tooth portion 32-12, thereby forming the second W-phase winding 24-W2 from the W-phase conductor, by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle.

[0156] Next, the automatic winding machine moves the U-phase conductor nozzle to pass the U-phase conductor through the U-phase connecting wire lead-out slit 64-U5 and the U-phase connecting wire lead-in slit 64-U6 in the outer peripheral wall 35, thereby forming the U-phase connecting wire 60-U from the U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, passes the V-phase conductor through the V-phase connecting wire lead-out slit 64-V5 and the V-phase connecting wire lead-in slit 64-V6 in the outer peripheral wall 35, thereby forming the V-phase connecting wire 60-V from the V-phase conductor. The automatic winding machine further operates the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle to pass the W-phase conductor through the W-phase connecting wire lead-out slit 64-W5 and the W-phase connecting wire lead-in slit 64-W6 in the outer peripheral wall 35, thereby forming the W-phase connecting wire 60-W from the W-phase conductor.

[0157] Next, the automatic winding machine moves the U-phase conductor nozzle to place a portion of the U-phase conductor on the lead side of seventh stator core tooth portion 32-7, thereby forming first U-phase power supply conductor 44-U1 from the U-phase conductor. At this time, the automatic winding machine operates the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle to place a portion of the V-phase conductor on the lead side of seventh stator core tooth portion 32-7, thereby forming first V-phase power supply conductor 44-V1 from the V-phase conductor. The automatic winding machine also operates the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle to place a portion of the W-phase conductor on the lead side of seventh stator core tooth portion 32-7, thereby forming first W-phase power supply conductor 44-W1 from the W-phase conductor.

[0158] Next, the automatic winding machine moves the U-phase conductor nozzle to wind the U-phase conductor clockwise around the seventh stator core tooth portion 32-7, thereby forming the second U-phase power supply conductor 44-U2 and the third U-phase winding 24-U3 from the U-phase conductor. At this time, the automatic winding machine winds the V-phase conductor clockwise around the eleventh stator core tooth portion 32-11 by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming the second V-phase power supply conductor 44-V2 and the third V-phase winding 24-V3 from the V-phase conductor. The automatic winding machine further winds the W-phase conductor clockwise around the third stator core tooth portion 32-3 by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming the second W-phase power supply conductor 44-W2 and the third W-phase winding 24-W3 from the W-phase conductor.

[0159] Next, the automatic winding machine moves the U-phase conductor nozzle to pass the U-phase conductor through the second U-phase lead-out slit 64-U3 and the second U-phase lead-in slit 64-U4 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the second U-phase crossover wire 42-U2 from the V-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can pass the V-phase conductor through the second V-phase lead-out slit 64-V3 and the second V-phase lead-in slit 64-V4 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the second V-phase crossover wire 42-V2 from the V-phase conductor. The automatic winding machine further operates the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle to pass the W-phase conductor through the second W-phase lead-out side slit 64-W3 and the second W-phase lead-in side slit 64-W4 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the second W-phase crossover wire 42-W2 from the W-phase conductor.

[0160] Next, the automatic winding machine moves the U-phase conductor nozzle, winds the U-phase conductor clockwise around tenth stator core tooth portion 32-10, arranges the other end of the U-phase conductor on the lead side of tenth stator core tooth portion 32-10, and forms fourth U-phase winding 24-U4 and second U-phase neutral conductor 43-U2 from the U-phase conductor. At this time, the automatic winding machine, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, can wind the V-phase conductor clockwise around second stator core tooth portion 32-2, arrange the other end of the V-phase conductor on the lead side of second stator core tooth portion 32-2, and form fourth V-phase winding 24-V4 and second V-phase neutral conductor 43-V2 from the V-phase conductor. The automatic winding machine further winds the W-phase conductor clockwise around the sixth stator core teeth portion 32-6 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and places the other end of the W-phase conductor on the lead side of the sixth stator core teeth portion 32-6, thereby forming a fourth W-phase winding 24-W4 and a second W-phase neutral wire 43-W2 from the W-phase conductor.

[0161] That is, in the stator of the motor of Example 3, the six U-phase slits 64-U1 to 64-U6, the six V-phase slits 64-V1 to 64-V6, and the six W-phase slits 64-W1 to 64-W6 have the same shapes, and therefore, like the stators of the motors of Examples 1 and 2, the stator can be easily manufactured by an automatic winding machine. Furthermore, in the stator of the motor of Example 3, the plurality of windings 24 are formed from three conductors, and therefore, the number of conductors to be handled is reduced compared to the stators of the motors of Examples 1 and 2, and therefore the stator can be manufactured more easily.

[0162] Although the motor of the third embodiment does not have multiple ribs formed on the outer peripheral wall portion 62, multiple ribs may be formed. The multiple ribs correspond to the multiple crossover wires 42, the U-phase connecting wire 60-U, the V-phase connecting wire 60-V, and the W-phase connecting wire 60-W. Each of the multiple ribs protrudes outward from the outer peripheral surface of the outer peripheral wall portion 62. A rib corresponding to a certain crossover wire among the multiple ribs is located on the anti-lead side of a portion of that crossover wire that is located outside the outer peripheral wall portion 62 and is in contact with that portion. A rib corresponding to a certain connecting wire among the multiple ribs is located on the anti-lead side of a portion of that connecting wire that is located outside the outer peripheral wall portion 62 and is in contact with that portion. In the motor of Example 3, when multiple ribs are formed on the outer wall portion 62, the portions of the multiple crossover wires 42 and the U-phase connecting wire 60-U, V-phase connecting wire 60-V, and W-phase connecting wire 60-W that are arranged outside the outer wall portion 62 can be prevented from shifting toward the anti-lead side from a predetermined region of the outer surface of the outer wall portion 72. [Example]

[0163] As shown in FIG. 13, the motor of the fourth embodiment differs from the motor 5 of the first embodiment in the combination of the windings 24 connected thereto. FIG. 13 is a wiring diagram showing the connection state of the windings 24 of the motor of the fourth embodiment. That is, in the first U-phase series-connection unit 45-U1, the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection unit 45-U2, the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection unit 45-U1 and the second U-phase series-connection unit 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 are arranged in the circumferential direction so that the multiple windings 24 are connected to adjacent poles, as shown in Fig. 14. Fig. 14 is a development view showing the stator 22 of the motor of the fourth embodiment.

[0164] In the motor of the fourth embodiment, the lower insulator 25 of the motor 5 of the first embodiment is further replaced with another lower insulator 71. The lower insulator 71 has a plurality of insulator teeth 36-1 to 36-12, similar to the lower insulator 25 described above, and the outer peripheral wall 35 of the lower insulator 25 is replaced with another outer peripheral wall 72. The outer peripheral wall 72 has a plurality of slits 74 formed therein, extending from a lower end of the outer peripheral wall 72 opposite the stator core 23 toward the stator core 23. The plurality of slits 74 include four U-phase slits 74-U1 to 74-U4, four V-phase slits 74-V1 to 74-V4, and four W-phase slits 74-W1 to 74-W4.

[0165] The four U-phase slits 74-U1 to 74-U4 include a first U-phase lead-out slit 74-U1, a first U-phase lead-in slit 74-U2, a second U-phase lead-out slit 74-U3, and a second U-phase lead-in slit 74-U4. The first U-phase lead-out slit 74-U1 is formed in a portion of the outer peripheral wall 72 on the opposite side from the first stator core teeth 32-1, and has a first depth d1. The first U-phase lead-in slit 74-U2 is formed in a portion of the outer peripheral wall 72 on the opposite side from the fourth stator core teeth 32-4, and has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side slit 74-U3 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the seventh stator core teeth 32-7, and has a first depth d1. The second U-phase lead-side slit 74-U4 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the tenth stator core teeth 32-10, and has a second depth d2.

[0166] The four V-phase slits 74-V1 to 74-V4 include a first V-phase lead-out slit 74-V1, a first V-phase lead-in slit 74-V2, a second V-phase lead-out slit 74-V3, and a second V-phase lead-in slit 74-V4. The first V-phase lead-out slit 74-V1 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the second stator core teeth 32-2, and has a first depth d1. The first V-phase lead-in slit 74-V2 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the fifth stator core teeth 32-5, and has a second depth d2. The second V-phase lead-side slit 74-V3 is formed in a portion of the outer peripheral wall 72 opposite the lead side of the eighth stator core teeth 32-8, and has a first depth d1. The second V-phase lead-side slit 74-V4 is formed in a portion of the outer peripheral wall 72 opposite the lead side of the eleventh stator core teeth 32-11, and has a second depth d2.

[0167] The four W-phase slits 74-W1 to 74-W4 include a first W-phase lead-out slit 74-W1, a first W-phase lead-in slit 74-W2, a second W-phase lead-out slit 74-W3, and a second W-phase lead-in slit 74-W4. The first W-phase lead-out slit 74-W1 is formed in a portion of the outer peripheral wall 72 on the opposite side from the third stator core teeth 32-3, and has a first depth d1. The first W-phase lead-in slit 74-W2 is formed in a portion of the outer peripheral wall 72 on the opposite side from the sixth stator core teeth 32-6, and has a second depth d2. The second W-phase lead-side slit 74-W3 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the ninth stator core teeth 32-9, and has a first depth d1. The second W-phase lead-side slit 74-W4 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the twelfth stator core teeth 32-12, and has a second depth d2.

[0168] That is, the four V-phase slits 74-V1 to 74-V4 are formed in the same manner as the four U-phase slits 74-U1 to 74-U4. Furthermore, the lower insulator 71 is formed so that when the lower insulator 71 is rotated 30 degrees around the rotation axis 16, the four U-phase slits 74-U1 to 74-U4 of the rotated lower insulator 71 overlap with the four V-phase slits 74-V1 to 74-V4 of the lower insulator 71 before the rotation. Furthermore, the four W-phase slits 74-W1 to 74-W4 are formed in the same manner as the four U-phase slits 74-U1 to 74-U4. In addition, the lower insulator 71 is formed so that when the lower insulator 71 is rotated 60 (=30+30) degrees around the rotation axis 16, the four U-phase slits 74-U1 to 74-U4 of the rotated lower insulator 71 overlap with the four W-phase slits 74-W1 to 74-W4 of the lower insulator 71 before rotation.

[0169] The first U-phase crossover wire 42-U1 passes through the first U-phase output slit 74-U1 and the first U-phase inlet slit 74-U2 so that a portion of the first U-phase crossover wire 42-U1 is positioned outside the outer circumferential wall portion 72. The first U-phase crossover wire 42-U1 also contacts the bottom of the first U-phase output slit 74-U1 and the bottom of the first U-phase inlet slit 74-U2. The first U-phase crossover wire 42-U1 also follows the outer circumferential surface of the outer circumferential wall portion 72 so that the portion of the first U-phase crossover wire 42-U1 positioned outside the outer circumferential wall portion 72 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 positioned outside the outer circumferential wall portion 72 is positioned along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0170] The second U-phase crossover wire 42-U2 passes through the second U-phase output slit 74-U3 and the second U-phase inlet slit 74-U4 so that a portion of the second U-phase crossover wire 42-U2 is positioned outside the outer wall portion 72. The second U-phase crossover wire 42-U2 also contacts the bottom of the second U-phase output slit 74-U3 and the bottom of the second U-phase inlet slit 74-U4. The second U-phase crossover wire 42-U2 also follows the outer peripheral surface of the outer wall portion 72 so that the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 72 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 positioned outside the outer wall portion 72 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 72.

[0171] The first V-phase crossover wire 42-V1 passes through the first V-phase outlet slit 74-V1 and the first V-phase inlet slit 74-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 72. The first V-phase crossover wire 42-V1 also contacts the bottom of the first V-phase outlet slit 74-V1 and the bottom of the first V-phase inlet slit 74-V2. The first V-phase crossover wire 42-V1 also follows the outer circumferential surface of the outer circumferential wall portion 72 so that the portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 72 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0172] The second V-phase crossover wire 42-V2 passes through the second V-phase outlet slit 74-V3 and the second V-phase inlet slit 74-V4 so that a portion of the second V-phase crossover wire 42-V2 is disposed outside the outer peripheral wall portion 72. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase outlet slit 74-V3 and the bottom of the second V-phase inlet slit 74-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 72 so that the portion of the second V-phase crossover wire 42-V2 disposed outside the outer peripheral wall portion 72 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 disposed outside the outer peripheral wall portion 72 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 72.

[0173] The first W-phase crossover wire 42-W1 passes through the first W-phase output slit 74-W1 and the first W-phase inlet slit 74-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer wall portion 72. The first W-phase crossover wire 42-W1 also contacts the bottom of the first W-phase output slit 74-W1 and the bottom of the first W-phase inlet slit 74-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer peripheral wall portion 72 so that the portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer peripheral wall portion 72 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer peripheral wall portion 72 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 72.

[0174] The second W-phase crossover wire 42-W2 passes through the second W-phase output slit 74-W3 and the second W-phase inlet slit 74-W4 so that a portion of the second W-phase crossover wire 42-W2 is positioned outside the outer wall portion 72. The second W-phase crossover wire 42-W2 also contacts the bottom of the second W-phase output slit 74-W3 and the bottom of the second W-phase inlet slit 74-W4. The second W-phase crossover wire 42-W2 also follows the outer peripheral surface of the outer wall portion 72 so that the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 72 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 72 is positioned along a predetermined region of the outer peripheral surface of the outer wall portion 72.

[0175] The lower insulator 71 further includes a plurality of ribs 75 corresponding to the plurality of crossover wires 42. Each of the plurality of ribs 75 protrudes outward from the outer peripheral surface of the outer peripheral wall portion 72. A rib among the plurality of ribs 75 corresponding to a certain crossover wire is disposed on the anti-lead side of a portion of that crossover wire that is disposed on the outer side of the outer peripheral wall portion 72 and is in contact with that portion. Therefore, the stator 22 can prevent the portion of the plurality of crossover wires 42 that is disposed on the outer side of the outer peripheral wall portion 72 from shifting toward the anti-lead side from a predetermined region of the outer peripheral surface of the outer peripheral wall portion 72.

[0176] The stator 22 is provided with two U-phase crossover wires 42-U1 to 42-U2 for the U-phase. One of the two U-phase crossover wires 42-U1 to 42-U2, the first U-phase crossover wire 42-U1, connects the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4. The other U-phase crossover wire, the second U-phase crossover wire 42-U2, connects the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4. As with the U-phase, the stator 22 is provided with two crossover wires for each of the V and W phases.

[0177] A plurality of slits 74 are formed in the outer peripheral wall 72 of the lower insulator 71. Crossover wires connected to the winding ends of the windings are drawn out through a plurality of lead-out slits among the plurality of slits 74. Crossover wires connected to the winding starts of the windings are drawn in through a plurality of lead-in slits among the plurality of slits 74. Each of the plurality of crossover wires 42 passes through two slits, a lead-out slit and a lead-in slit, formed in the outer peripheral wall 72 of the lower insulator 71, and a portion is disposed on the outer peripheral side of the outer peripheral wall 72. Furthermore, in each of the three phases, of the four slits, the lead-out slit of the first crossover wire, the lead-in slit of the first crossover wire, the lead-in slit of the second crossover wire, and the lead-in slit of the second crossover wire, at least two slits have the same depth.

[0178] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of the fourth embodiment, the depths of the four types of slits that hold the crossover wires do not all need to be different, and the axial height of the outer wall portion 72 can be reduced while ensuring the insulation distance between the crossover wires, thereby achieving both a compact motor 5 and ensuring insulation.

[0179] The conductors forming the four U-phase windings 24-U1 to 24-U4 of the motor 5 of the fourth embodiment include a first U-phase series-connection portion 45-U1 and a second U-phase series-connection portion 45-U2. The first U-phase series-connection portion 45-U1 connects the first U-phase winding 24-U1 and the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 in series. The second U-phase series-connection portion 45-U2 connects the third U-phase winding 24-U3 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 in series. The first U-phase series-connection portion 45-U1 and the second U-phase series-connection portion 45-U2 are connected in parallel. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. In the motor 5 of the fourth embodiment, the multiple windings 24 are connected in this manner, so that each phase has two crossover wires.

[0180] Furthermore, in the motor 5 of Example 4, when the first U-phase winding 24-U1, the second U-phase winding 24-U2, the third U-phase winding 24-U3, and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are arranged in this order in the circumferential direction, the first U-phase crossover wire 42-U1, which is one of the two U-phase crossover wires 42-U1 to 42-U2, connects the first U-phase winding 24-U1 to the second U-phase winding 24-U2, and the second U-phase crossover wire 42-U2, which is the other U-phase crossover wire of the two U-phase crossover wires 42-U1 to 42-U2, connects the third U-phase winding 24-U3 to the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the windings 24 of the motor 5 of the fourth embodiment are connected in adjacent poles.

[0181] Furthermore, in the motor 5 of the fourth embodiment, the four V-phase slits 74-V1 to 74-V4 are formed so that the shapes of the four U-phase slits 74-U1 to 74-U4 match the shapes of the four U-phase slits 74-W1 to 74-W4, and the shapes of the four W-phase slits 74-U1 to 74-W4 match the shapes of the four U-phase slits 74-U1 to 74-U4. That is, the multiple slits 74 are formed so that, when the outer peripheral wall portion 72 of the lower insulator 71 virtually rotates around the rotation axis 16, the four U-phase slits 74-U1 to 74-U4 after the rotation match the four V-phase slits 74-V1 to 74-V4 and the four W-phase slits 74-W1 to 74-W4 before the rotation. In the motor 5 of the first embodiment, the multiple windings 24 corresponding to the three phases can be formed using three conductors supplied from three nozzles of an automatic winding machine, the operation of which is synchronized and linked.

[0182] Furthermore, motor 5 of Example 4 is formed so that four U-phase slits 74-U1 to 74-U4 coincide with four V-phase slits 74-V1 to 74-V4 when outer peripheral wall portion 72 of lower insulator 71 is rotated virtually 30 degrees in the circumferential direction about rotation shaft 16. Motor 5 of Example 4 is further formed so that four U-phase slits 74-U1 to 74-U4 coincide with four W-phase slits 74-W1 to 74-W4 when outer peripheral wall portion 72 of lower insulator 71 is rotated virtually 60 (= 30 + 30) degrees in the circumferential direction about rotation shaft 16. In this case, motor 5 of Example 4 can have two types of depth for the four U-phase slits 74-U1 to 74-U4.

[0183] Furthermore, in the motor 5 of the fourth embodiment, two of the four U-phase slits 74-U1 to 74-U4 each have a first depth d1, and the other two U-phase slits each have a second depth d2 that is shallower than the first depth d1. The four V-phase slits 74-V1 to 74-V4 and the four W-phase slits 74-W1 to 74-W4 are formed in the same manner as the four U-phase slits 74-U1 to 74-U4. In this case, the motor 5 of the fourth embodiment ensures an insulation distance between the crossover wires of different phases, and by providing two different depths for the slits that hold the crossover wires, the axial height of the outer circumferential wall portion 72 of the lower insulator 71 can be reduced. This allows the motor 5 to be miniaturized while maintaining good insulation.

[0184] In the motor 5 of the fourth embodiment, the depths of the first U-phase output slit 74-U1 and the second U-phase output slit 74-U3 among the four U-phase slits 74-U1 to 74-U4 are both a first depth d1, and the depths of the first U-phase inlet slit 74-U2 and the second U-phase inlet slit 74-U4 are both a second depth d2 that is shallower than the first depth d1. The four V-phase slits 74-V1 to 74-V4 and the four W-phase slits 74-W1 to 74-W4 are also formed in the same manner as the four U-phase slits 74-U1 to 74-U4. In this case, when the arrangement interval between the three-phase slits is 30 degrees in adjacent pole connection, the motor 5 of the fourth embodiment can reduce the number of slit depths to two, while still ensuring insulation distance and preventing crossover wires of different phases from riding over each other.

[0185] By being configured in this manner, the motor of Example 4 can ensure the mutual insulation of the multiple crossover wires 42, similar to the motor 5 of Example 1 described above. Furthermore, the motor of Example 4 can reduce the axial height of the outer peripheral wall portion 72 by forming the multiple slits 74 from two types of slits: multiple slits with a first depth d1 and multiple slits with a second depth d2. The motor of Example 4 can reduce its axial height due to the small height of the outer peripheral wall portion 72. A compressor provided with the motor of Example 4 can reduce its axial height due to the small height of the motor of Example 4.

[0186] Incidentally, although the outer peripheral wall portions 35, 52, 72 of the motors of the previously described embodiments have the plurality of ribs 49, 55, 75 formed thereon, the plurality of ribs 49, 55, 75 may be omitted. Even when the plurality of ribs 49, 55, 75 are omitted, the plurality of crossover wires 42 are spaced apart from one another, so that the crossover wires 42 of different phases can be prevented from contacting each other, as in the motors of the previously described embodiments.

[0187] Although the embodiments have been described above, the embodiments are not limited to the above content. Furthermore, the above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be combined as appropriate. Furthermore, at least one of various omissions, substitutions, and modifications of the components can be made without departing from the spirit of the embodiments. [Explanation of symbols]

[0188] 1: Compressor 5: Motor 6: Compression section 16: Rotation axis 21: Rotor 22: Stator 23: Stator core 24: Multiple windings 25: Lower insulator 31: York section 32-1 to 32-12: Multiple stator core teeth 35: Outer wall 36-1 to 36-12: Multiple insulator teeth 38: Rotor core 39: Permanent magnet 41-1: 1st neutral point 41-2:Second neutral point 42: Multiple crossovers 43: Multiple neutral wires 44: Multiple power lines 45-U1: 1st U phase series connection part 45-U2: 2nd U phase series connection part 45-V1: 1st V phase series connection part 45-V2: 2nd V phase series connection part 45-W1: 1st W phase series connection part 45-W2: 2nd W phase series connection part 48-U1~48-U4: Four U-phase slits 48-V1~48-V4: Four V-phase slits 48-W1~48-W4: Four W-phase slits 49: Multiple ribs 51: Lower insulator 52:Outer peripheral wall 54-U1~54-U4: Four U-phase slits 54-V1~54-V4: Four V-phase slits 54-W1~54-W4: Four W-phase slits 55: Multiple ribs 60-U: U phase connecting wire 60-V: V-phase connecting wire 60-W: W-phase connecting wire 61: Lower insulator 62: Outer wall 64-U1~64-U6: Six U-phase slits 64-V1~64-V6: Six V-phase slits 64-W1~64-W6: Six W-phase slits 71: Lower insulator 72: Outer wall 74-U1~74-U4: Four U-phase slits 74-V1~74-V4: Four V-phase slits 74-W1~74-W4: Four W-phase slits 75: Multiple ribs

Claims

1. A rotor, a stator that generates a magnetic field that rotates the rotor about a rotation axis, The stator includes: a stator core having an annular yoke portion surrounding an outer periphery of the rotor, and a plurality of teeth (first to twelfth teeth) protruding from an inner periphery of the yoke portion toward the rotor and arranged in a circumferential direction; a cylindrical insulator disposed at one end of the stator core in an axial direction parallel to the rotation axis; a plurality of windings formed by winding a conducting wire around each of the plurality of teeth via the insulator, the plurality of windings include four U-phase windings, four V-phase windings, and four W-phase windings, and are arranged such that two adjacent windings in the circumferential direction of the stator core are windings of different phases; The stator has, for each of the three phases: a first crossover wire that connects two of the four in-phase windings together; a second crossover wire that connects two other windings of the four windings that are in the same phase, a plurality of slits are formed in the insulator, including a plurality of lead-out slits led out from the winding end of the winding wire connected to the jumper wire, and a plurality of lead-in slits led in to the winding start of the winding wire connected to the jumper wire, each of the plurality of crossover wires passes through two slits, i.e., the lead-out side slit and the lead-in side slit, formed in the insulator, thereby connecting two of the windings of the same phase; In each of the three phases, at least two of the four slits, i.e., the draw-out side slit of the first crossover line, the draw-in side slit of the first crossover line, the draw-out side slit of the second crossover line, and the draw-in side slit of the second crossover line, have the same depth. Motor.

2. a portion of the crossover wire disposed on the outer circumferential side of the insulator is positioned in the axial direction by the bottom of the slit; The motor according to claim 1 .

3. The rotor has eight poles. The motor according to claim 1 .

4. the conductor forming the plurality of windings of one of the three phases has a first series-connected portion in which two of the four windings are connected in series, and a second series-connected portion in which the other two of the four windings are connected in series; the first series connection unit and the second series connection unit are connected in parallel; The motor according to claim 3.

5. The two windings to which each of the crossover wires is connected are connected at the sides not connected to the crossover wire to either a power line or a neutral line. The motor according to claim 1 .

6. The combination of the depths of the four slits is common to each of the three phases. The motor according to claim 1 .

7. One of the U phase, V phase, and W phase is designated as the X phase, When the four X-phase windings are arranged in the circumferential direction as a first X-phase winding, a second X-phase winding, a third X-phase winding, and a fourth X-phase winding, a first X-phase crossover wire, which is one of the two X-phase crossover wires, connects the first X-phase winding and the second X-phase winding; a second X-phase crossover wire, which is the other of the two X-phase crossover wires, connects the third X-phase winding and the fourth X-phase winding; The motor according to claim 1 .

8. When the four slits of one phase are virtually rotated by a predetermined angle in the circumferential direction around the rotation axis, the shape of the four slits of the one phase coincides with the shape of the four slits of the other phase. The motor according to claim 7.

9. The predetermined angles by which the four slits of one phase are virtually rotated in the circumferential direction are 120 degrees and 240 degrees. The motor according to claim 8.

10. In each of the three phases, of four slits, namely, the outlet side slit of the first crossover wire, the inlet side slit of the first crossover wire, the outlet side slit of the second crossover wire, and the inlet side slit of the second crossover wire, the depths of two slits are all first depths, and the depths of the remaining two slits are all second depths that are shallower than the first depths. The motor according to claim 9.

11. In said one phase, a depth of a draw-out side slit of the first crossover wire and a depth of a draw-in side slit of the first crossover wire are both the first depth, a depth of the lead-out side slit of the second crossover wire and a depth of the lead-in side slit of the second crossover wire are both the second depth which is shallower than the first depth; The motor of claim 10.

12. a connecting wire is drawn from the second X-phase winding, connected to the X-phase power line, and drawn to the outer circumferential side of the insulator through the slits, and both of the two slits through which the connecting wire passes have a third depth that is shallower than the first depth and deeper than the second depth; The motor of claim 10.

13. The predetermined angles by which the four slits of one phase are virtually rotated in the circumferential direction are 30 degrees and 60 degrees. The motor according to claim 8.

14. In each of the three phases, of four slits, namely, the outlet side slit of the first crossover wire, the inlet side slit of the first crossover wire, the outlet side slit of the second crossover wire, and the inlet side slit of the second crossover wire, the depths of two slits are all first depths, and the depths of the remaining two slits are all second depths that are shallower than the first depths.

14. The motor of claim 13.

15. In said one phase, a depth of the lead-out side slit of the first crossover wire and a depth of the lead-out side slit of the second crossover wire are both the first depth, a depth of the lead-in side slit of the first crossover wire and a depth of the lead-in side slit of the second crossover wire are both the second depth which is shallower than the first depth; 15. The motor of claim 14.

16. One of the U phase, V phase, and W phase is designated as the X phase, When the four X-phase windings are arranged in the circumferential direction as a first X-phase winding, a second X-phase winding, a third X-phase winding, and a fourth X-phase winding, a first X-phase crossover wire, which is one of the two X-phase crossover wires, connects the first X-phase winding and the third X-phase winding; a second X-phase crossover wire, which is the other of the two X-phase crossover wires, connects the second X-phase winding and the fourth X-phase winding; The motor according to claim 1 .

17. When the four slits of one phase are virtually rotated by a predetermined angle in the circumferential direction around the rotation axis, the shape of the four slits of the one phase coincides with the shape of the four slits of the other phase.

17. The motor of claim 16.

18. The predetermined angles by which the four slits of one phase are virtually rotated in the circumferential direction are 120 degrees and 240 degrees.

18. The motor of claim 17.

19. In said one phase, a depth of the lead-out side slit of the first crossover wire is a first depth, a depth of the lead-in side slit of the first crossover wire and a depth of the lead-out side slit of the second crossover wire are both a second depth that is shallower than the first depth, a depth of the lead-in side slit of the second crossover wire is a third depth that is shallower than the second depth; 20. The motor of claim 18.

20. A plurality of ribs are formed on the outer circumferential surface of the insulator, The rib restricts the movement of the crossover wire in the axial direction. The motor according to claim 1 .

21. A motor according to any one of claims 1 to 20; a compression section that compresses a refrigerant by rotation of the rotor; a housing having an enclosed space formed therein in which the motor and the compression unit are housed; Compressor.

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