Motor and compressor

Abstract

A stator (22) of a motor (5) is provided with: an outer circumferential wall section (35) in which a plurality of slits (48) are formed; a plurality of windings (24); and a plurality of crossover wires (42). A first crossover wire (42-U1) of the two crossover wires (42-U1 to 42-U2) of each phase (U) connects two windings (24-U1, 24-U2) of the four windings (24-U1 to 24-U4) of the phase (U) and passes through two slits (48-U1, 48-U2) of the four slits (48-U1 to 48-U4) of the phase (U) so that a portion of the first crossover wire (42-U1) is disposed on the outer circumferential side of the outer circumferential wall section (35). The second crossover wire (42-U2) connects the two windings (24-U3, 24-U4) and passes through the two slits (48-U3, 48-U4) so that a portion of the second crossover wire (42-U2) is disposed on the outer peripheral side of the outer peripheral wall part (35). The depths of two of the four slits of each phase are the same.

Description

Motors and Compressors

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

[0002] A known compressor includes a motor and a compressor unit that compresses a refrigerant using rotational power generated by the motor, housed inside a container. The motor has an annular stator (stator core) disposed on the outer periphery of a rotor. The stator includes 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 teeth, and a cylindrical insulator disposed at one axial end of the stator core. In a case where 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 disposed on the outer periphery of the cylindrical insulator (see Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2001-119885

[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.

[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 surrounding 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 winding ends of the windings connected to the jumper wires, and a plurality of lead-in-side slits that are drawn into the winding 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.

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

[0008] FIG. 1 is a longitudinal cross-sectional view showing a compressor equipped with a motor of Example 1. FIG. 2 is a plan view showing a stator core. FIG. 3 is a plan view showing a motor. FIG. 4 is a wiring diagram showing the connection state of multiple windings. FIG. 5 is a developed view showing a stator. FIG. 6 is a developed view showing the stator of a motor of Comparative Example 1. FIG. 7 is a developed view showing the stator of a motor of Comparative Example 2. FIG. 8 is a developed view showing the stator of a motor of Comparative Example 3. FIG. 9 is a wiring diagram showing the connection state of multiple windings of a motor of Example 2. FIG. 10 is a developed view showing the stator of a motor of Example 2. FIG. 11 is a wiring diagram showing the connection state of multiple windings of a motor of Example 3. FIG. 12 is a developed view showing the stator of a motor of Example 3. FIG. 13 is a wiring diagram showing the connection state of multiple windings of a motor of Example 4. FIG. 14 is a developed view showing the stator of a motor of Example 4.

[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.

[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 provided with the motor 5 of the first embodiment. The compressor 1 includes a housing 2, a shaft 3, a motor 5, and a compression unit 6. An internal space 7 separated from the outside of the housing 2 is formed inside the housing 2. The internal space 7 is formed in a generally 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 the stator core 23. The stator core 23 is formed by laminating multiple electromagnetic steel plates made of a soft magnetic material, such as silicon steel plates. The stator core 23 includes a yoke portion 31 and multiple stator core teeth portions 32-1 to 32-12. The yoke portion 31 is formed in a generally cylindrical shape and is disposed in the internal space 7 so that the central axis of the yoke portion 31 overlaps with the rotational axis 16 of the rotor 21. Of the multiple stator core teeth portions 32-1 to 32-12, the first stator core teeth portion 32-1 is formed in a generally columnar shape. The first stator core teeth portion 32-1 is formed integrally with the yoke portion 31 so that one end of the first stator core teeth portion 32-1 is adjacent to the inner circumferential surface of the yoke portion 31; that is, it protrudes from the inner circumferential surface of the yoke portion 31 toward the rotational axis 16. Similar to first stator core teeth portion 32-1, the other stator core teeth portions of multiple stator core teeth portions 32-1 to 32-12 are also formed in a generally cylindrical shape and protrude from the inner peripheral surface of yoke portion 31. Multiple stator core teeth portions 32-1 to 32-12 are aligned at equal intervals in the circumferential direction on the inner peripheral surface of yoke portion 31, and are arranged at 30-degree intervals around rotation axis 16.

[0016] FIG. 3 is a plan view showing the motor 5. The lower insulator 25 is formed from an insulating material, 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 arranged 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] The upper insulator 26 is formed in the same manner as the lower insulator 25, and includes an outer peripheral wall portion and a plurality of insulator teeth portions. The upper insulator 26 is disposed on the stator core 23 so that one axial end of the outer peripheral wall portion is adjacent to the upper end of the yoke portion 31 of the 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 the upper insulator 26 is formed in the same manner as the lower insulator 25, the motor 5 does not need to manufacture the upper insulator 26 separately from the lower insulator 25, and by using the lower insulator 25 manufactured as the 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 different from the first stator core teeth portion 32-1 among the plurality of stator core teeth portions 32-1 to 32-12 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 stator core teeth 32-1 to 32-12 wound around a plurality of windings 24 together with a plurality of insulator teeth 36-1 to 36-12 and a plurality of insulator teeth 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 stacking 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, multiple crossover wires 42, multiple neutral wires 43, and multiple power supply wires 44. FIG. 4 is a wiring diagram showing the connection state of the multiple windings 24. The first neutral point 41-1 is electrically insulated from the second neutral point 41-2. 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. The multiple crossover wires 42 include 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 the 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 the 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 unit 45-U1 and the second U-phase series-connection unit 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 jumper wires 42-W1 to 42-W2 further include a first W-phase jumper wire 42-W1 and a second W-phase jumper 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 jumper 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 plurality of power lines 44 further includes 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 45-W1 and the second W-phase series-connection 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 teeth portion 32-8. The third V-phase winding 24-V3 is wound around the eleventh stator core teeth portion 32-11. The fourth V-phase winding 24-V4 is wound around the second stator core teeth portion 32-2. The first W-phase winding 24-W1 is wound around the ninth stator core teeth portion 32-9. The second W-phase winding 24-W2 is wound around the twelfth stator core teeth portion 32-12. The third W-phase winding 24-W3 is wound around the third stator core teeth portion 32-3. The fourth W-phase winding 24-W4 is wound around the sixth stator core teeth 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 so as to be equal to the 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 so as to be equal to the first depth d1. The second U-phase lead-side 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 is formed so that the depth of the second U-phase lead-side slit 48-U3 is equal to the second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side 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 is formed so that the depth of the second U-phase lead-side slit 48-U4 is equal to the 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 to the lead of the fifth stator core teeth 32-5, and is formed so that the depth of the first V-phase lead-out slit 48-V1 is equal to the 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 to the lead of the eighth stator core teeth 32-8, and is formed so that the depth of the first V-phase lead-in slit 48-V2 is equal to the 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 is formed so that the depth of the second V-phase lead-side slit 48-V3 is equal to 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 is formed so that the depth of the second V-phase lead-side slit 48-V4 is equal to 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 to the lead of the ninth stator core teeth 32-9, and the depth of the first W-phase lead-out slit 48-W1 is equal to the 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 to the lead of the twelfth stator core teeth 32-12, and the depth of the first W-phase lead-in slit 48-W2 is equal to the 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 the depth of the second W-phase lead-side slit 48-W3 is equal to 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 the depth of the second W-phase lead-side slit 48-W4 is equal to 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 peripheral 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 peripheral wall portion 35 so that the portion of the second U-phase crossover wire 42-U2 positioned outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 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.

[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 positioned 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 positioned outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 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.

[0041] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 48-V3 and the second V-phase lead-in 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 lead-out slit 48-V3 and the bottom of the second V-phase lead-in 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 positioned 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 peripheral wall portion 35 so that the portion of the first W-phase crossover wire 42-W1 positioned outside the outer peripheral wall portion 35 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 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.

[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 positioned 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 positioned outside the outer wall portion 35 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 35 is positioned 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. A rib among the plurality of ribs 49 corresponding to a certain crossover wire is disposed on the anti-lead side of a 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 jumper wires 42 to be spaced apart from one another, preventing the multiple jumper wires 42 from contacting one another and ensuring the mutual insulation of the multiple jumper wires 42. Furthermore, in the motor 5, the axial height of the outer peripheral wall portion 35 can be reduced by forming multiple slits 48 of two different depths: 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: 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] The stator 22 is manufactured by using an automatic winding machine to properly attach the first U-phase conductor, the second U-phase conductor, the first V-phase conductor, the second V-phase conductor, the first W-phase conductor, and the second W-phase conductor to the stator core 23, to which the lower insulator 25 and the 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 in synchronization 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, the stator core 23, to which the lower insulator 25 and the upper insulator 26 are appropriately attached, is set in the automatic winding machine so that the central axis of the yoke portion 31 of the stator core 23 coincides with the central axis of the automatic winding machine. After one end of the first 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 first U-phase conductor counterclockwise around the first stator core teeth portion 32-1, thereby forming the first U-phase power supply line 44-U1 and the 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 using 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 using 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, by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, is able 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 allows the W-phase conductor nozzle to operate in conjunction with the U-phase conductor nozzle, thereby passing the first W-phase conductor through the first W-phase lead-out slit 48-W1 and the first W-phase lead-in 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 teeth 32-4, place the other end of the first U-phase conductor on the lead side of fourth stator core teeth 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 teeth 32-8, place the other end of the first V-phase conductor on the lead side of eighth stator core teeth 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 teeth 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 teeth 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 teeth portion 32-11 after one end of the second V-phase conductor has been positioned on the lead side of eleventh stator core teeth 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 allows the W-phase conductor nozzle to operate in conjunction with the U-phase conductor nozzle, thereby passing 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 peripheral 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 teeth portion 32-10, places the other end of the second U-phase conductor on the lead side of tenth stator core teeth 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, can wind the second V-phase conductor counterclockwise around second stator core teeth portion 32-2, place the other end of the second V-phase conductor on the lead side of second stator core teeth portion 32-2, and form 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 shapes of 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 are the same, 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] [Operation of Compressor 1] 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 AC 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 rotating magnetic field generated by the stator 22 causes the rotor 21 to rotate around the rotation axis 16. The rotation of the rotor 21 causes the shaft 3 to rotate around the rotation axis 16 and transmit the rotation of the rotor 21 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 between the compression unit 6 and the motor 5 in the internal space 7 passes through a gap formed in the motor 5 and is supplied to the space above the motor 5 in the internal space 7. The high-pressure gas refrigerant supplied to the space above the motor 5 in the internal space 7 is discharged via the discharge pipe 12 to a device in the refrigerant circuit downstream of the compressor 1. When the compressor 1 operates in this manner, the refrigerant circulates 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, multiple 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 multiple 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 multiple 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 of the first stator core teeth 32-1, and the depth of the first U-phase lead-side slit 104-U1 is equal to the 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 of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-side slit 104-U2 is equal to the 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 of the seventh stator core teeth 32-7, and the depth of the second U-phase lead-side slit 104-U3 is equal to the 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 is formed so that the depth of the second U-phase lead-in slit 104-U4 is equal to the 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 teeth 32-2, and the depth of the first V-phase lead-side slit 104-V1 is equal to the 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 teeth 32-5, and the depth of the first V-phase lead-side slit 104-V2 is equal to the 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 teeth 32-8, and the depth of the second V-phase lead-side slit 104-V3 is equal to the second depth d2. The second V-phase retraction side slit 104-V4 is formed in the portion of the outer wall portion 103 on the opposite lead side of the 11th stator core teeth portion 32-11, and is formed so that the depth of the second V-phase retraction side slit 104-V4 is equal to the 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 teeth 32-6, and the depth of the first W-phase lead-side slit 104-W1 is equal to the 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 teeth 32-9, and the depth of the first W-phase lead-side slit 104-W2 is equal to the 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 teeth 32-12, and the depth of the second W-phase lead-side slit 104-W3 is equal to the 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 is formed so that the depth of the second W-phase retraction side slit 104-W4 is equal to the 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 of the four U-phase windings 24-U1 to 24-U4 is connected in series with the third U-phase winding 24-U3. In the second U-phase series-connection unit 45-U2, the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 is connected in series with the fourth U-phase winding 24-U4. 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. In other words, the multiple windings 24 of the motor of Comparative Example 1 are arranged so that the multiple windings 24 are connected to 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 that is located outside the outer circumferential wall portion 103 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 that is 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 peripheral surface of the outer peripheral wall portion 103 so that the portion of the second U-phase crossover wire 42-U2 that is located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 that is located outside the outer peripheral 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 lead-out slit 48-V1 and the first V-phase lead-in slit 48-V2 and is in contact with the bottom of the first V-phase lead-out slit 48-V1 and the bottom of the first V-phase lead-in slit 48-V2. The first V-phase crossover wire 42-V1 also follows the outer peripheral surface of the outer peripheral wall portion 103 so that the portion of the first V-phase crossover wire 42-V1 that is located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 that is located outside the outer peripheral 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 lead-out slit 48-V3 and the second V-phase lead-in slit 48-V4 and contacts the bottom of the second V-phase lead-out slit 48-V3 and the bottom of the second V-phase lead-in 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 that is located outside the outer peripheral wall portion 103 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 that is 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, and therefore the height of the outer peripheral wall portion 103 is 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 making it possible to reduce 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, compared to the motor of Comparative Example 1, the motor 5 of Example 1 can space different phase crossover wires 42 farther apart from each other, thereby more reliably preventing contact between the different phase crossover wires of the multiple crossover wires 42.

[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 lead-in slit 104-U4, the second V-phase lead-in slit 104-V4, and the second W-phase lead-in slit 104-W4 are set equal to a fourth depth that is shallower than the third depth d3. This allows the second V-phase crossover wire 42-V2 to be separated 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 from the second V-phase crossover wire 42-V2. 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 circumferential 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, multiple 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 multiple 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 multiple 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 of the first stator core teeth 32-1, and the depth of the first U-phase lead-side slit 114-U1 is equal to the 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 of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-side slit 114-U2 is equal to the 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 of the seventh stator core teeth 32-7, and the depth of the second U-phase lead-side slit 114-U3 is equal to the 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 is formed so that the depth of the second U-phase lead-in slit 114-U4 is equal to the 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 teeth 32-5, and the depth of the first V-phase lead-side slit 114-V1 is equal to the 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 teeth 32-8, and the depth of the first V-phase lead-side slit 114-V2 is equal to the 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 teeth 32-11, and the depth of the second V-phase lead-side slit 114-V3 is equal to the second depth d2. The second V-phase retraction 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 is formed so that the depth of the second V-phase retraction side slit 114-V4 is equal to the 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 teeth 32-3, and the depth of the first W-phase lead-side slit 114-W1 is equal to the 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 teeth 32-6, and the depth of the first W-phase lead-side slit 114-W2 is equal to the 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 teeth 32-9, and the depth of the second W-phase lead-side slit 114-W3 is equal to the second depth d2. The second W-phase retraction side slit 114-W4 is formed in the portion of the outer wall portion 113 on the opposite lead side of the 12th stator core teeth portion 32-12, and is formed so that the depth of the second W-phase retraction side slit 114-W4 is equal to the 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. In other words, the multiple windings 24 of the motor of Comparative Example 2 are arranged so that the multiple windings 24 are connected to 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 that is located outside the outer circumferential wall portion 113 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 that is 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 peripheral surface of the outer peripheral wall portion 113 so that the portion of the second U-phase crossover wire 42-U2 that is located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 that is located outside the outer peripheral 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 is in contact with 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 113 so that the portion of the first V-phase crossover wire 42-V1 that is located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 that is located outside the outer peripheral 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 lead-out slit 48-V3 and the second V-phase lead-in slit 48-V4 and contacts the bottom of the second V-phase lead-out slit 48-V3 and the bottom of the second V-phase lead-in 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 that is located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 that is 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 portion 113 so that the portion of the first W-phase crossover wire 42-W1 that is located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 that is located outside the outer peripheral wall portion 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 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 113 so that the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 113 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 located outside the outer peripheral wall portion 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, so that the height of the outer peripheral wall portion 113 is 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 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 contacting the first V-phase crossover wire 42-V1. That is, the motor 5 of Example 1 can space different phase crossover wires 42 apart from each other more widely than the motor of Comparative Example 2, thereby more reliably preventing different phase crossover wires 42 from contacting each other.

[0083] In the motor of Comparative Example 2, the depths of second U-phase output slit 114-U3, second V-phase output slit 114-V3, and second W-phase output slit 114-W3 are set equal to third depth d3, and the depths of second U-phase lead-in slit 114-U4, second V-phase lead-in slit 114-V4, and second W-phase lead-in slit 114-W4 are set equal to a fourth depth that is shallower than third depth d3. This allows second U-phase crossover wire 42-U2 to be separated from first V-phase crossover wire 42-V1, preventing second U-phase crossover wire 42-U2 from contacting first V-phase crossover wire 42-V1, which is a crossover wire of a different phase from second U-phase crossover wire 42-U2. However, in this case, in the motor of Comparative Example 2, multiple slits 114 are formed from four types of slits with different depths, which further increases the height of outer peripheral 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, multiple 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 multiple 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 multiple 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 teeth 32-1, and the depth of the first U-phase lead-side slit 124-U1 is equal to the 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 teeth 32-4, and the depth of the first U-phase lead-side slit 124-U2 is equal to the 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 teeth 32-7, and the depth of the second U-phase lead-side slit 124-U3 is equal to the 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 is formed so that the depth of the second U-phase lead-in slit 124-U4 is equal to the 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 the depth of the first V-phase lead-side slit 124-V1 is equal to the 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 the depth of the first V-phase lead-side slit 124-V2 is equal to the 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 the depth of the second V-phase lead-side slit 124-V3 is equal to the second depth d2. The second V-phase retraction 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 is formed so that the depth of the second V-phase retraction side slit 124-V4 is equal to 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 teeth 32-3, and the depth of the first W-phase lead-side slit 124-W1 is equal to the 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 teeth 32-6, and the depth of the first W-phase lead-side slit 124-W2 is equal to the 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 teeth 32-9, and the depth of the second W-phase lead-side slit 124-W3 is equal to the second depth d2. The second W-phase retraction side slit 124-W4 is formed in the portion of the outer wall portion 123 on the opposite lead side of the 12th stator core teeth portion 32-12, and is formed so that the depth of the second W-phase retraction side slit 124-W4 is equal to the 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 so that when the lower insulator 112 is rotated 210 degrees around the rotation shaft 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 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. In other words, the multiple windings 24 of the motor of Comparative Example 3 are arranged so that the multiple windings 24 are connected to 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 that is located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the second U-phase crossover wire 42-U2 that is 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 the portion of the first V-phase crossover wire 42-V1 that is located outside the outer circumferential wall portion 123 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 that is 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 lead-out slit 124-V3 and the second V-phase lead-in slit 124-V4 and contacts the bottom of the second V-phase lead-out slit 124-V3 and the bottom of the second V-phase lead-in slit 124-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 123 so that the portion of the second V-phase crossover wire 42-V2 that is located outside the outer peripheral wall portion 123 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 that is located outside the outer peripheral 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 inlet slit 124-W2 and is in contact with the bottom of the first W-phase output slit 124-W1 and the bottom of the first W-phase inlet slit 124-W2. The first W-phase crossover wire 42-W1 also follows the outer peripheral surface of the outer peripheral wall portion 123 so that the portion of the first W-phase crossover wire 42-W1 that is located outside the outer peripheral wall portion 123 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 that is located outside the outer peripheral 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 inlet slit 124-W4 and contacts the bottom of the second W-phase output slit 124-W3 and the bottom of the second W-phase inlet 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. In other words, 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 of First Embodiment] Motor 5 of the first embodiment includes rotor 21 and stator 22 that generates a magnetic field that rotates rotor 21 around rotation shaft 16. Stator 22 includes stator core 23, an outer peripheral wall portion 35 of a cylindrical lower insulator 25, and a plurality of windings 24. Stator core 23 includes an annular yoke portion 31 that surrounds the outer peripheral side of rotor 21, and a plurality of stator core teeth 32-1 to 32-12 that protrude from the inner peripheral side of yoke portion 31 toward rotor 21 and are aligned in the circumferential direction. Outer peripheral wall portion 35 is disposed at one end of stator core 23 in the axial direction that is parallel to rotation shaft 16. The plurality of windings 24 are formed by winding a conductor around each of the plurality of stator core teeth 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. The 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 48. The crossover wires connected to the winding starts of the windings are drawn in through a plurality of the draw-side slits among the plurality of slits 48. Each of the plurality of crossover wires 42 passes through two slits, a draw-side slit and a draw-side slit, formed in the outer peripheral wall 35 of the lower insulator 25, and a portion of the crossover wire 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 draw-side slit of the first crossover wire, the draw-side slit of the second crossover wire, and the draw-side slit of the second crossover wire, at least two of the 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 Example 1, 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.

[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 on the outer peripheral surface of the outer peripheral wall portion 35, the crossover wire can be disposed in a predetermined region on 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 two permanent magnets 39 arranged in a V-shape.

[0103] The conductors forming the four U-phase windings 24-U1 to 24-U4 of the motor 5 of the first embodiment include a first U-phase series-connection section 45-U1 and a second U-phase series-connection section 45-U2. The first U-phase series-connection section 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 section 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 section 45-U1 and the second U-phase series-connection section 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 the two ends of the windings of the motor 5 of Example 1, the end that is not connected to the crossover 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 the motor 5 of Example 1, the combination of the four slit depths is common to each of the three phases. In the winding process of the motor 5 of Example 1, which is performed by an automatic winding machine that performs a pre-specified operation, the combination of the four slit depths is common to the three phases, so that it is not necessary to change the operation for each phase, and the winding process can be simplified.

[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. In other words, the windings 24 of the motor 5 of the first embodiment are connected in adjacent poles.

[0107] Furthermore, in the 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 the outer peripheral wall portion 35 of the lower insulator 25 virtually rotates around the 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 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 whose operations are synchronized and linked.

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

[0109] Furthermore, in the 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 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 formed in the same manner as the four U-phase slits 48-U1 to 48-U4. In this case, the motor 5 of the first 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 wall portion 35 of the lower insulator 25 can be reduced. This allows the motor 5 to be compact and have good insulation properties.

[0110] In the motor 5 of the first embodiment, the depth of the first U-phase lead-out slit 48-U1 and the depth of 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 depth of the second U-phase lead-out slit 48-U3 and the depth of 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, in the motor 5 of the first embodiment, when the arrangement interval between the three-phase slits is 120 degrees in adjacent pole connection, the number of slit depths can be reduced to two, while still ensuring insulation distance and preventing crossover wires of different phases from running 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.

[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 of the four U-phase windings 24-U1 to 24-U4 is connected in series with the third U-phase winding 24-U3. In the second U-phase series-connection unit 45-U2, the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 is connected in series with the fourth U-phase winding 24-U4. 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 multiple 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 the stator 22 of the motor of the second embodiment. That is, the multiple windings 24 are arranged so that a winding of the same phase as two of the multiple 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 wall 52 opposite the lead side of the first stator core teeth 32-1, and the depth of the first U-phase lead-out slit 54-U1 is equal to the first depth d1. The first U-phase lead-in slit 54-U2 is formed in a portion of the outer wall 52 opposite the lead side of the seventh stator core teeth 32-7, and the depth of the first U-phase lead-in slit 54-U2 is equal to the second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-side slit 54-U3 is formed in a portion of the outer peripheral wall 52 opposite the lead side of the fourth stator core teeth 32-4, and is formed so that the depth of the second U-phase lead-side slit 54-U3 is equal to the second depth d2. The second U-phase lead-side slit 54-U4 is formed in a portion of the outer peripheral wall 52 opposite the lead side of the tenth stator core teeth 32-10, and is formed so that the depth of the second U-phase lead-side slit 54-U4 is equal to the 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 equal to the 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 equal to the 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 teeth 32-8, and the depth of the second V-phase lead-side slit 54-V3 is equal to the 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 teeth 32-2, and the depth of the second V-phase lead-side slit 54-V4 is equal to the 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 to the lead of the ninth stator core teeth 32-9, and the depth of the first W-phase lead-out slit 54-W1 is equal to the 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 to the lead of the third stator core teeth 32-3, and the depth of the first W-phase lead-in slit 54-W2 is equal to the 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 the depth of the second W-phase lead-side slit 54-W3 is equal to the 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 the depth of the second W-phase lead-side slit 54-W4 is equal to the 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 positioned outside the outer 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 peripheral surface of the outer wall portion 52 so that the portion of the first U-phase crossover wire 42-U1 positioned outside the outer wall portion 52 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 positioned outside the outer wall portion 52 is positioned along a predetermined region of the outer peripheral surface of the outer 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 inlet 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 inlet 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 peripheral 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 peripheral wall portion 52 so that the portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer peripheral wall portion 52 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer peripheral wall portion 52 is disposed along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 52.

[0122] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 54-V3 and the second V-phase lead-in slit 54-V4 so that a portion of the second V-phase crossover wire 42-V2 is positioned outside the outer peripheral wall portion 52. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase lead-out slit 54-V3 and the bottom of the second V-phase lead-in slit 54-V4. The second V-phase crossover wire 42-V2 also follows the outer peripheral surface of the outer peripheral wall portion 52 so that the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 52 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 52 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral 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 has two U-phase crossover wires 42-U1 to 42-U2 for the U-phase. 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 also has 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 draw-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 draw-side slit, formed in the outer peripheral wall 35 of the lower insulator 25, and a portion of the crossover wire 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 draw-side slit of the first crossover wire, the draw-side slit of the second crossover wire, and the draw-side slit of the second crossover wire, at least two slits have the same depth.

[0128] The four types of slits are formed by 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 of the second embodiment include a first U-phase series-connection section 45-U1 and a second U-phase series-connection section 45-U2. The first U-phase series-connection section 45-U1 connects the first U-phase winding 24-U1 of the four U-phase windings 24-U1 to 24-U4 in series with the third U-phase winding 24-U3. The second U-phase series-connection section 45-U2 connects the second U-phase winding 24-U2 of the four U-phase windings 24-U1 to 24-U4 in series with the fourth U-phase winding 24-U4. The first U-phase series-connection section 45-U1 and the second U-phase series-connection section 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 jumper wire 42-U1, which is one of the two U-phase jumper 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 jumper wire 42-U2, which is the other U-phase jumper wire of the two U-phase jumper 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. In other words, the multiple windings 24 of the motor 5 of the first embodiment are connected in a separated pole manner.

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

[0132] Furthermore, in the motor 5 of the second embodiment, two of the four U-phase slits 54-U1 to 54-U4 (54-U2, 54-U3) 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 formed in the same manner as the four U-phase slits 54-U1 to 54-U4. In this case, the motor 5 of the second embodiment ensures an insulation distance between the crossover wires of different phases, and by providing three different depths for the slits that hold the crossover wires, the axial height of the outer wall portion 35 of the lower insulator 25 can be reduced. This allows the 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 (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 a remote 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 has multiple slits 54 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 52 to be reduced. The motor of Example 2 can be reduced in height in the axial direction due to the reduced height of the outer peripheral wall portion 52. A compressor equipped with the motor of Example 2 can be reduced in height in the axial direction due to the reduced height of the motor of Example 2.

[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 supply line 44-W1 and the second W-phase power supply line 44-W2 are routed while remaining connected during the winding process, and then, after the winding process, as shown in FIG. 11, the first W-phase power supply line 44-W1 and the second W-phase power supply line 44-W2 are separated, with both ends of the separated lines being connected to a W-phase power supply.

[0137] The stator of the motor of Example 3 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 , the motor of the third embodiment further replaces the lower insulator 25 of the motor 5 of the first embodiment with another lower insulator 61. The lower insulator 61 includes 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 from the lower end of the outer peripheral wall 62 on the side opposite to 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 to the lead of the first stator core teeth 32-1, and is formed so that the depth of the first U-phase lead-out slit 64-U1 is equal to the first 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 to the lead of the fourth stator core teeth 32-4, and is formed so that the depth of the first U-phase lead-in slit 64-U2 is equal to the first 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 equal to the 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 equal to the 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 equal to the 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 lead-in side slit 64-U6 is formed in a portion of the outer peripheral wall portion 62 on the side opposite the lead of the seventh stator core teeth portion 32-7, and is formed so that the depth of the U-phase connecting wire lead-in side slit 64-U6 is equal to the third depth d3.

[0140] The six V-phase slits 64-V1 to 64-V6 include a first V-phase lead-out slit 64-V1, a first V-phase lead-in slit 64-V2, a second V-phase lead-out slit 64-V3, a second V-phase lead-in slit 64-V4, a V-phase connecting wire lead-out slit 64-V5, and a V-phase connecting wire lead-in slit 64-V6. The first V-phase lead-out 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 lead-out slit 64-V1 is equal to the first depth d1. The first V-phase lead-in 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 lead-in slit 64-V2 is equal to the 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 teeth 32-11, and the depth of the second V-phase lead-out slit 64-V3 is equal to the 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 teeth 32-2, and the depth of the second V-phase lead-in slit 64-V4 is equal to the 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 teeth 32-8, and the depth of the V-phase connecting wire lead-out slit 64-V5 is equal to the 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 of the lead of the 11th stator core teeth portion 32-11, and is formed so that the depth of the V-phase connecting wire inlet side slit 64-V6 is equal to the 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 of the lead of the ninth stator core teeth 32-9, and the depth of the first W-phase lead-out slit 64-W1 is equal to the 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 of the lead of the twelfth stator core teeth 32-12, and the depth of the first W-phase lead-in slit 64-W2 is equal to the 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 teeth 32-3, and the depth of the second W-phase lead-out slit 64-W3 is equal 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 teeth 32-6, and the depth of the second W-phase lead-in slit 64-W4 is equal 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 teeth 32-12, and the depth of the W-phase connecting wire lead-out slit 64-W5 is equal 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 side of the lead of the third stator core teeth portion 32-3, and is formed so that the depth of the W-phase connecting wire inlet side slit 64-W6 is equal to the 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 such 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 positioned 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 positioned outside the outer circumferential wall portion 62 does not sag. Therefore, the portion of the first U-phase crossover wire 42-U1 positioned outside the outer circumferential wall portion 62 is positioned 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 inlet 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 inlet 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 peripheral wall 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 peripheral wall 62 so that the portion of the U-phase connecting wire 60-U positioned outside the outer peripheral wall 62 does not sag. Therefore, the portion of the U-phase connecting wire 60-U positioned outside the outer peripheral wall 62 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall 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 peripheral 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 peripheral surface of the outer peripheral wall portion 62 so that the portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer peripheral wall portion 62 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 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.

[0147] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 64-V3 and the second V-phase lead-in slit 64-V4 so that a portion of the second V-phase crossover wire 42-V2 is positioned outside the outer peripheral wall portion 62. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase lead-out slit 64-V3 and the bottom of the second V-phase lead-in 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 positioned outside the outer peripheral wall portion 62 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 62 is positioned 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 portion 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 portion 62 so that the portion of the V-phase connecting wire 60-V positioned outside the outer peripheral wall portion 62 does not sag. Therefore, the portion of the V-phase connecting wire 60-V positioned outside the outer peripheral wall portion 62 is positioned along a predetermined region of the outer peripheral surface of the outer peripheral wall portion 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 positioned 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 wall portion 62 so that the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 62 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 62 is positioned along a predetermined region of the outer peripheral surface of the outer 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 positioned 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 positioned outside the outer wall portion 62 does not sag. Therefore, the portion of the second W-phase crossover wire 42-W2 positioned outside the outer wall portion 62 is positioned 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 Example 3 is configured in this manner, allowing 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 to be separated from one another, thereby 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 Example 3 has 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 small height of the outer peripheral wall portion 62 allows the axial height of the motor of Example 3 to be reduced. A compressor equipped with the motor of Example 3 can also have a small axial height due to the small height of the motor of Example 3.

[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. 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 positioned 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, and can form 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, and can form 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 and passes 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. Furthermore, the automatic winding machine can pass the W-phase conductor through the first W-phase lead-out side slit 64-W1 and the first W-phase lead-in side slit 64-W2 in the outer wall portion 35 of the lower insulator 61 by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, 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 by operating the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming the second V-phase winding 24-V2 from the V-phase conductor. The automatic winding machine further winds the W-phase conductor counterclockwise around the twelfth stator core tooth portion 32-12 by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, thereby forming the second W-phase winding 24-W2 from the W-phase conductor.

[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 portion 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, is able to pass 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 portion 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 portion 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 teeth 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 teeth portion 32-7, thereby forming first V-phase power supply conductor 44-V1 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 place a portion of the W-phase conductor on the lead side of seventh stator core teeth 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. Furthermore, the automatic winding machine can 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 wall portion 35 of the lower insulator 61 by operating the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, 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 teeth portion 32-10, places the other end of the U-phase conductor on the lead side of tenth stator core teeth 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 teeth portion 32-2, place the other end of the V-phase conductor on the lead side of second stator core teeth 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 using 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 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 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 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 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 jumper 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.

[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 Figure 14. Figure 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 portion 35 of the lower insulator 25 is replaced with another outer peripheral wall portion 72. The outer peripheral wall portion 72 has a plurality of slits 74 formed from the lower end of the outer peripheral wall portion 72 on the side opposite to 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 wall 72 opposite the lead side of the first stator core teeth 32-1, and is formed so that the depth of the first U-phase lead-out slit 74-U1 is equal to the first depth d1. The first U-phase lead-in slit 74-U2 is formed in a portion of the outer wall 72 opposite the lead side of the fourth stator core teeth 32-4, and is formed so that the depth of the first U-phase lead-in slit 74-U2 is equal to the 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 is formed so that the depth of the second U-phase lead-side slit 74-U3 is equal to the 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 is formed so that the depth of the second U-phase lead-side slit 74-U4 is equal to the 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 the depth of the first V-phase lead-out slit 74-V1 is equal to the 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 the depth of the first V-phase lead-in slit 74-V2 is equal to the second depth d2. The second V-phase lead-side slit 74-V3 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the eighth stator core teeth 32-8, and is formed so that the depth of the second V-phase lead-side slit 74-V3 is equal to the first depth d1. The second V-phase lead-side slit 74-V4 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the eleventh stator core teeth 32-11, and is formed so that the depth of the second V-phase lead-side slit 74-V4 is equal to the second depth d2.

[0167] The four W-phase slits 74-W1 to 74-W4 include a first W-phase lead-side slit 74-W1, a first W-phase lead-side slit 74-W2, a second W-phase lead-side slit 74-W3, and a second W-phase lead-side slit 74-W4. The first W-phase lead-side slit 74-W1 is formed in a portion of the outer peripheral wall 72 on the opposite side of the lead of the third stator core teeth 32-3, and the depth of the first W-phase lead-side slit 74-W1 is equal to the first depth d1. The first W-phase lead-side slit 74-W2 is formed in a portion of the outer peripheral wall 72 on the opposite side of the lead of the sixth stator core teeth 32-6, and the depth of the first W-phase lead-side slit 74-W2 is equal to the 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 the depth of the second W-phase lead-side slit 74-W3 is equal to the 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 the depth of the second W-phase lead-side slit 74-W4 is equal to the 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 peripheral 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 peripheral surface of the outer peripheral wall portion 72 so that the portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer peripheral wall portion 72 does not sag. Therefore, the portion of the first V-phase crossover wire 42-V1 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.

[0172] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 74-V3 and the second V-phase lead-in slit 74-V4 so that a portion of the second V-phase crossover wire 42-V2 is positioned outside the outer peripheral wall portion 72. The second V-phase crossover wire 42-V2 also contacts the bottom of the second V-phase lead-out slit 74-V3 and the bottom of the second V-phase lead-in 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 positioned outside the outer peripheral wall portion 72 does not sag. Therefore, the portion of the second V-phase crossover wire 42-V2 positioned outside the outer peripheral wall portion 72 is positioned 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 positioned 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 wall portion 72 so that the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 72 does not sag. Therefore, the portion of the first W-phase crossover wire 42-W1 positioned outside the outer wall portion 72 is positioned along a predetermined region of the outer peripheral surface of the outer 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 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 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 has two U-phase crossover wires 42-U1 to 42-U2 for the U-phase. 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. The stator 22 also has two crossover wires for each of the V and W phases, similar to the U-phase.

[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 slits 74. Crossover wires connected to the winding starts of the windings are drawn in through a plurality of lead-in slits among the 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 of the crossover wire 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 of the 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 Example 4, 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 section 45-U1 and a second U-phase series-connection section 45-U2. The first U-phase series-connection section 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 section 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 section 45-U1 and the second U-phase series-connection section 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 jumper wire 42-U1, which is one of the two U-phase jumper 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 jumper wire 42-U2, which is the other U-phase jumper wire of the two U-phase jumper 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. In other words, 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 rotation match the four V-phase slits 74-V1 to 74-V4 and the four W-phase slits 74-W1 to 74-W4 before rotation. The motor 5 of the first embodiment can form the multiple windings 24 corresponding to the three phases using three conductors supplied from three nozzles of an automatic winding machine whose operations are synchronized and linked.

[0182] Furthermore, in the motor 5 of the fourth embodiment, the four U-phase slits 74-U1 to 74-U4 are formed to coincide with the four V-phase slits 74-V1 to 74-V4 when the outer peripheral wall portion 72 of the lower insulator 71 is rotated virtually 30 degrees in the circumferential direction about the rotation shaft 16. The motor 5 of the fourth embodiment is further formed to coincide with the four U-phase slits 74-U1 to 74-U4 when the outer peripheral wall portion 72 of the lower insulator 71 is rotated virtually 60 (= 30 + 30) degrees in the circumferential direction about the rotation shaft 16. In this case, the motor 5 of the fourth embodiment 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 wall portion 72 of the lower insulator 71 can be reduced. This allows the motor 5 to be miniaturized while maintaining insulation performance.

[0184] In the motor 5 of the fourth embodiment, the depth of the first U-phase lead-out slit 74-U1 and the depth of the second U-phase lead-out slit 74-U3 among the four U-phase slits 74-U1 to 74-U4 are both a first depth d1, and the depth of the first U-phase lead-in slit 74-U2 and the depth of the second U-phase lead-in 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, in the motor 5 of the fourth embodiment, when the arrangement interval between the three-phase slits is 30 degrees in adjacent pole connection, the number of slit depths can be reduced to two, while still ensuring insulation distance and preventing crossover wires of different phases from running 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 has multiple slits 74 formed from two types of slits: multiple slits with a first depth d1 and multiple slits with a second depth d2, which allows the axial height of the outer peripheral wall portion 72 to be reduced. The motor of Example 4 can be reduced in height in the axial direction due to the reduced height of the outer peripheral wall portion 72. A compressor equipped with the motor of Example 4 can be reduced in height in the axial direction due to the reduced 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 from the motor, the plurality of crossover wires 42 are spaced apart from one another, so that crossover wires of different phases among the plurality of crossover wires 42 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 scope of so-called equivalents. 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 within the scope that does not deviate from the gist of the embodiments.

[0188] 1: Compressor 5: Motor 6: Compression section 16: Rotating shaft 21: Rotor 22: Stator 23: Stator core 24: Multiple windings 25: Lower insulator 31: Yoke section 32-1 to 32-12: Multiple stator core teeth sections 35: Outer peripheral wall section 36-1 to 36-12: Multiple insulator teeth sections 38: Rotor core 39: Permanent magnet 41-1: First neutral point 41-2: Second neutral point 42: Multiple crossover wires 43: Multiple neutral wires 44: Multiple power supply wires 45-U1: First U-phase series connection section 45-U2: Second U-phase series connection section 45-V1: First V-phase series connection section 45-V2: Second V-phase series connection section 45-W1: First W-phase series connection section 45-W2: Second W-phase series connection portion 48-U1 to 48-U4: Four U-phase slits 48-V1 to 48-V4: Four V-phase slits 48-W1 to 48-W4: Four W-phase slits 49: Multiple ribs 51: Lower insulator 52: Outer circumferential wall portion 54-U1 to 54-U4: Four U-phase slits 54-V1 to 54-V4: Four V-phase slits 54-W1 to 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 circumferential wall portion 64-U1 to 64-U6: Six U-phase slits 64-V1 to 64-V6: Six V-phase slits 64-W1 to 64-W6: Six W-phase slits 71: Lower insulator 72: Outer peripheral wall portion 74-U1 to 74-U4: Four U-phase slits 74-V1 to 74-V4: Four V-phase slits 74-W1 to 74-W4: Four W-phase slits 75: Multiple ribs

Claims

1. A motor comprising a rotor and a stator that generates a magnetic field for rotating the rotor around a rotation axis, wherein the stator includes an annular yoke portion surrounding an outer peripheral side of the rotor, a stator core having a plurality of teeth, i.e., first teeth to twelfth teeth, protruding from an inner peripheral side 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, and a plurality of windings formed by winding conducting wires 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 being arranged such that two adjacent windings in the circumferential direction of the stator core are windings of different phases, the stator further including, for each of the three phases, a first jumper wire that connects two of the four windings of the same phase, and a second jumper wire that connects the other two of the four windings of the same phase, the insulator having a plurality of slits formed therein, the plurality of slits including a plurality of lead-out side slits drawn out from an end of winding of the winding connected to the jumper wire, and a plurality of lead-in side slits drawn into a start of winding of the winding connected to the jumper wire, each of the plurality of jumper wires connecting two windings of the same phase by passing through two slits, i.e., the lead-out side slit and the lead-in side slit, formed in the insulator, and in each of the three phases, at least two of four slits, i.e., the lead-out side slit and the lead-in side slit of the first jumper wire and the lead-out side slit and the lead-in side slit of the second jumper wire, have the same depth.

2. The motor according to claim 1, wherein a portion of the jumper wire disposed on an outer peripheral side of the insulator is axially positioned by a bottom portion of the slit.

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

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

5. For each of the two windings to which each of the jumper wires is connected, the side not connected to the jumper wire is connected to either a power line or a neutral line. The motor according to claim 1.

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

7. Designate any one of the U phase, V phase, and W phase as the X phase. When the four windings of the X phase are designated as the first X-phase winding, the second X-phase winding, the third X-phase winding, and the fourth X-phase winding in the order of arrangement in the circumferential direction, one of the two jumper wires of the X phase, the first X-phase jumper wire, connects the first X-phase winding and the second X-phase winding, and the other of the two jumper wires of the X phase, the second X-phase jumper wire, 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 for virtually rotating the four slits of the one phase in the circumferential direction are 120 degrees and 240 degrees. The motor according to claim 8.

10. In each of the three phases, among the four slits of the lead-out side slit of the first jumper wire, the lead-in side slit of the first jumper wire, the lead-out side slit of the second jumper wire, and the lead-in side slit of the second jumper wire, the depths of two of the slits are both the first depth, and the depths of the remaining two slits are both the second depth, which is shallower than the first depth. The motor according to claim 9.

11. In the one phase, the depth of the lead-out side slit of the first jumper wire and the depth of the lead-in side slit of the first jumper wire are both the first depth, and the depth of the lead-out side slit of the second jumper wire and the depth of the lead-in side slit of the second jumper wire are both the second depth, which is shallower than the first depth. The motor according to claim 10.

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

13. The motor according to claim 8, wherein a predetermined angle for virtually rotating the four slits of one phase in the circumferential direction is 30 degrees and 60 degrees.

14. In each of the three phases, among the four slits including the lead-out side slit of the first jumper wire, the lead-in side slit of the first jumper wire, the lead-out side slit of the second jumper wire, and the lead-in side slit of the second jumper wire, the depths of two of the slits are both the first depth, and the depths of the remaining two slits are both a second depth that is shallower than the first depth. The motor according to claim 13.

15. In one phase, the depth of the lead-out side slit of the first jumper wire and the depth of the lead-out side slit of the second jumper wire are both the first depth, and the depth of the lead-in side slit of the first jumper wire and the depth of the lead-in side slit of the second jumper wire are both the second depth that is shallower than the first depth. The motor according to claim 14.

16. When any one of the U-phase, V-phase, and W-phase is defined as the X-phase, and the four windings of the X-phase are designated as the first X-phase winding, the second X-phase winding, the third X-phase winding, and the fourth X-phase winding in the order of arrangement in the circumferential direction, one of the two jumper wires of the X-phase, the first X-phase jumper wire, connects the first X-phase winding and the third X-phase winding, and the other of the two jumper wires of the X-phase, the second X-phase jumper wire, connects the second X-phase winding and the fourth X-phase winding. The motor according to claim 1.

17. The motor according to claim 16, wherein when the four slits of one phase are virtually rotated by a predetermined angle in the circumferential direction about the rotation axis, the shapes of the four slits of one phase match the shapes of the four slits of the other phase.

18. The motor according to claim 17, wherein a predetermined angle for virtually rotating the four slits of one phase in the circumferential direction is 120 degrees and 240 degrees.

19. In the one phase, the depth of the lead-out side slit of the first jumper wire is a first depth, the depth of the lead-in side slit of the first jumper wire and the depth of the lead-out side slit of the second jumper wire are both a second depth shallower than the first depth, and the depth of the lead-in side slit of the second jumper wire is a third depth shallower than the second depth. The motor according to claim 18.

20. A plurality of ribs are formed on the outer peripheral surface of the insulator, and the ribs restrict the axial movement of the jumper wire. The motor according to claim 1.

21. A motor having a rotor and a stator that generates a magnetic field for rotating the rotor around a rotation axis, a compression unit that compresses a refrigerant when the rotor rotates, and a housing in which a sealed space for storing the motor and the compression unit is formed inside. The stator includes an annular yoke portion that surrounds the outer peripheral side of the rotor, and first teeth to twelfth teeth, which are a plurality of teeth that protrude from the inner peripheral side of the yoke portion toward the rotor and are arranged in the circumferential direction. A stator core having the first teeth to twelfth teeth, a cylindrical insulator disposed at one end of the stator core in the axial direction 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 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 further includes, for each of the three phases, a first jumper wire that is a jumper wire connecting two of the four windings of the same phase, and a second jumper wire that is a jumper wire connecting the other two of the four windings of the same phase. The insulator is formed with a plurality of slits including a plurality of lead-out side slits drawn out from the end of winding of the winding connected to the jumper wire and a plurality of lead-in side slits drawn into the start of winding of the winding connected to the jumper wire. Each of the plurality of jumper wires connects two windings of the same phase by passing through two slits, namely the lead-out side slit and the lead-in side slit, formed in the insulator. In each of the three phases, at least two of the four slits, namely the lead-out side slit of the first jumper wire, the lead-in side slit of the first jumper wire, the lead-out side slit of the second jumper wire, and the lead-in side slit of the second jumper wire, have the same depth. Compressor.

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