Motors and Compressors

Abstract

Reduce the axial height of the insulator. [Solution] A stator 22 of a motor includes an outer peripheral wall portion 35 in which a plurality of slits 48 consisting of four slits provided for each phase are formed, a plurality of windings 24 consisting of four windings provided for each phase, and a plurality of jumper wires 42 consisting of two jumper wires provided for each phase, a first of the two jumper wires of a certain phase connects two of the four windings of that phase and passes through two of the four slits of that phase such that a portion of the first jumper wire is positioned on the outer peripheral side of the outer peripheral wall portion 35, a second of the two jumper wires of that phase connects the other two of the four windings of that phase and passes through the other two of the four slits of that phase such that a portion of the second jumper wire is positioned on the outer peripheral side of the outer peripheral wall portion 35, and the depth of the two of the four slits of each phase is a predetermined depth.

Description

[Technical field]

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

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

[0003] [Patent Document 1] JP 2001-119885 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such motors, when multiple crossover wires are arranged in the axial direction parallel to the rotating shaft, the axial height of the cylindrical insulator needs to be increased to prevent the 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 has an object to provide a motor and a compressor in which the axial height of a cylindrical insulator can be reduced. [Means for solving the problem]

[0006] A motor according to one aspect of the present disclosure includes a rotor and a stator that generates a magnetic field that rotates the rotor about a rotation axis, the stator having a stator core having an annular yoke portion 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 two of the windings adjacent to each other in the circumferential direction of the stator core are arranged in a circumferential direction. the stator further includes, for each of the three phases, a first crossover wire which is a crossover wire connecting two of the four windings of the same phase together, and a second crossover wire which is a crossover wire connecting the other two of the four windings of the same phase together, the insulator is formed with a plurality of slits including a plurality of exit-side slits which are drawn out from the ends of the windings connected to the crossover wires, and a plurality of entrance-side slits which are drawn in to the starts of the windings connected to the crossover wires, and each of the plurality of crossover wires connects the two windings of the same phase together by passing through the exit-side slit and the entrance-side slit formed in the insulator, When any one of the U, V, and W phases is designated 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, the first X-phase jumper wire, which is one of the two jumper wires of the X phase, 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, and the four slits of one phase are a second phase in which, when virtually rotated in a circumferential direction around the rotation axis, a shape of the four slits of the one phase coincides with a shape of the four slits of the other phase, and in the one phase, a depth of a draw-out side slit of the first crossover wire and a depth of a draw-in side slit of the first crossover wire are both a first depth, and a depth of a draw-out side slit of the second crossover wire and a depth of a draw-in side slit of the second crossover wire are both shallower than the first depth; It's depth. Effect of the Invention

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

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

[0009] Hereinafter, a motor and a compressor according to an embodiment 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 addition, in the following description, the same components are given the same reference numerals, and duplicated descriptions will be omitted. EXAMPLES

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

[0011] The housing 2 includes 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 upper part of the housing 2, one end of the U-phase power terminal 8U is disposed in the internal space 7, and the other end of the U-phase power terminal 8U is disposed outside the housing 2. The V-phase power terminal 8V is made of a conductor. The V-phase power terminal 8V penetrates the upper part of the housing 2, one end of the V-phase power terminal 8V is disposed in the internal space 7, and the other end of the V-phase power terminal 8V is disposed outside the housing 2. The W-phase power terminal 8W is made of a conductor. The W-phase power terminal 8W penetrates the upper part of the housing 2, one end of the W-phase power terminal 8W is disposed in the internal space 7, and the other end of the W-phase power terminal 8W is disposed outside the housing 2. The U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W are attached to the housing 2 such that the U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W are not electrically connected to each other, and such that the U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power 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 such that the flow path 14 is connected to a 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 such that the flow path 15 is connected to an 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 along the central axis of a 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 is 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 type compression mechanism, and 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 stacking a plurality of electromagnetic steel plates made of a soft magnetic material, such as silicon steel plates. The stator core 23 includes a yoke portion 31 and a plurality of 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 such that the central axis of the yoke portion 31 overlaps with the rotating shaft 16 of the rotor 21. The first stator core teeth portion 32-1 of the plurality of stator core teeth portions 32-1 to 32-12 is formed in a generally columnar shape. The first stator core teeth portion 32-1 is formed integrally with the yoke portion 31 such that one end of the first stator core teeth portion 32-1 is adjacent to the inner peripheral surface of the yoke portion 31, that is, it protrudes from the inner peripheral surface of the yoke portion 31 toward the rotating shaft 16. Similar to first stator core teeth portion 32-1, the other stator core teeth portions of the multiple stator core teeth portions 32-1 to 32-12 are also formed in a generally cylindrical shape and protrude from the inner circumferential surface of yoke portion 31. The multiple stator core teeth portions 32-1 to 32-12 are aligned at equal intervals in the circumferential direction on the inner circumferential surface of yoke portion 31, and are disposed every 30 degrees around rotation axis 16.

[0016] 3 is a plan view showing the motor 5. The lower insulator 25 is formed of an insulator exemplified by polybutylene terephthalate resin PBT. The lower insulator 25 includes an outer peripheral wall portion 35 and a plurality of insulator teeth portions 36-1 to 36-12. The outer peripheral wall portion 35 is formed in a generally cylindrical shape. Among the plurality of insulator teeth portions 36-1 to 36-12, a first insulator tooth portion 36-1 is formed in a columnar shape. The first insulator tooth portion 36-1 is formed integrally with the outer peripheral wall portion 35 such that one end of the first insulator tooth portion 36-1 is adjacent to the inner peripheral surface of the outer peripheral wall portion 35, that is, the first insulator tooth portion 36-1 protrudes from the inner peripheral surface of the outer peripheral wall portion 35 toward the rotating shaft 16. Similar to 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 formed in a generally columnar shape and protrude from the inner circumferential surface of the outer circumferential 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 circumferential surface of the outer circumferential wall portion 35, and are disposed at 30 degree intervals around the central axis of the outer circumferential wall portion 35.

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

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

[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 other than 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 windings 24 wound around the plurality of stator core teeth portions 32-1 to 32-12 together with the plurality of insulator teeth portions 36-1 to 36-12 and the plurality of insulator teeth portions of the upper insulator 26, thereby preventing the plurality of windings 24 from being electrically short-circuited to the stator core 23.

[0020] The rotor 21 includes a rotor core 38 and eight permanent magnets 39. The rotor core 38 is formed by 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 in the circumferential direction of the rotor 21, and fixed to the rotor core 38. The eight permanent magnets 39 are configured so that the rotor 21 has eight poles.

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

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

[0025] The four V-phase windings 24-V1 to 24-V4 include a first V-phase winding 24-V1, a second V-phase winding 24-V2, a third V-phase winding 24-V3, and a fourth V-phase winding 24-V4. The two V-phase crossover wires 42-V1 to 42-V2 further include a first V-phase crossover wire 42-V1 and a second V-phase crossover wire 42-V2. One end of the first V-phase winding 24-V1 is connected to one end of the second V-phase winding 24-V2 via the first V-phase crossover wire 42-V1. That is, the stator 22 is provided with a first V-phase series connection section 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 neutral wires 43 further include 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 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. That is, the first V-phase series connection part 45-V1 and the second V-phase series connection part 45-V2 are connected in parallel.

[0028] The four W-phase windings 24-W1 to 24-W4 include a first W-phase winding 24-W1, a second W-phase winding 24-W2, a third W-phase winding 24-W3, and a fourth W-phase winding 24-W4. The two W-phase crossover wires 42-W1 to 42-W2 further include a first W-phase crossover wire 42-W1 and a second W-phase crossover wire 42-W2. One end of the first W-phase winding 24-W1 is connected to one end of the second W-phase winding 24-W2 via the first W-phase crossover wire 42-W1. That is, the stator 22 is provided with a first W-phase series connection portion 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 portion 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 neutral wires 43 further include 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 power supply lines 44 further include a first W-phase power supply line 44-W1 and a second W-phase power supply line 44-W2. The other end of the first W-phase winding 24-W1 is connected to a W-phase power supply terminal 8W via the first W-phase power supply line 44-W1. The other end of the third W-phase winding 24-W3 is connected to a W-phase power supply terminal 8W via a second W-phase power supply line 44-W2. That is, the first W-phase series connection part 45-W1 and the second W-phase series connection part 45-W2 are connected in parallel.

[0031] For convenience, when any one of the U, V, and W phases is designated as the X phase, the four windings of the X phase are called the first X-phase winding, the second X-phase winding, the third X-phase winding, and the fourth X-phase winding in the order in which they are arranged in the circumferential direction. 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 so that the U-phase, V-phase, and W-phase are repeated in this order in the circumferential direction of the stator core 23. FIG. 5 is a development view showing the stator 22. The multiple windings 24 are further arranged so that the multiple windings 24 are connected in adjacent poles. That is, the multiple windings 24 are arranged so that a winding of the same phase as the two windings of the multiple windings 24 that are connected in series is not located between the two windings of the multiple windings 24 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 portion 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 opposite lead side where the lower insulator 25 is disposed as viewed from the stator core 23, of the first stator core teeth 32-1, and the depth of the first U-phase lead-out slit 48-U1 is formed to a first depth d1. The first U-phase lead-in slit 48-U2 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-in slit 48-U2 is formed to a first depth d1. The second U-phase lead-in side slit 48-U3 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the seventh stator core teeth 32-7, and the second U-phase lead-in side slit 48-U3 has a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-in side slit 48-U4 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the tenth stator core teeth 32-10, and the second U-phase lead-in side slit 48-U4 has a second depth d2.

[0035] The four V-phase slits 48-V1 to 48-V4 include a first V-phase lead-out slit 48-V1, a first V-phase lead-in slit 48-V2, a second V-phase lead-out slit 48-V3, and a second V-phase lead-in slit 48-V4. The first V-phase lead-out slit 48-V1 is formed in a portion of the outer wall 35 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 48-V1 is formed to a first depth d1. The first V-phase lead-in slit 48-V2 is formed in a portion of the outer wall 35 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 48-V2 is formed to a first depth d1. The second V-phase lead-in side slit 48-V3 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the eleventh stator core teeth 32-11, and the second V-phase lead-in side slit 48-V3 has a second depth d2. The second V-phase lead-in side slit 48-V4 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the second stator core teeth 32-2, and the second V-phase lead-in side slit 48-V4 has a 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 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 formed to a first depth d1. The first W-phase lead-in slit 48-W2 is formed in a portion of the outer 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 formed to a first depth d1. The second W-phase lead-in side slit 48-W3 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the third stator core teeth 32-3, and the second W-phase lead-in side slit 48-W3 has a second depth d2. The second W-phase lead-in side slit 48-W4 is formed in a portion of the outer peripheral wall 35 on the opposite lead side of the sixth stator core teeth 32-6, and the second W-phase lead-in side slit 48-W4 has a 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 such 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 lower insulator 25 after the rotation 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 lower insulator 25 after rotation 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 lead-out slit 48-U1 and the first U-phase lead-in slit 48-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 35. The first U-phase crossover wire 42-U1 is further in contact with the bottom of the first U-phase lead-out slit 48-U1 and the bottom of the first U-phase lead-in slit 48-U2. The first U-phase crossover wire 42-U1 is further along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 35 does not bend. Therefore, a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 35 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 35.

[0039] The second U-phase crossover wire 42-U2 passes through the second U-phase lead-out slit 48-U3 and the second U-phase lead-in slit 48-U4 so that a portion of the second U-phase crossover wire 42-U2 is disposed outside the outer circumferential wall portion 35. The second U-phase crossover wire 42-U2 is further in contact with the bottom of the second U-phase lead-out slit 48-U3 and the bottom of the second U-phase lead-in slit 48-U4. The second U-phase crossover wire 42-U2 is further along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 35 does not bend. Therefore, a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 35 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 35.

[0040] 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 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 35. The first V-phase crossover wire 42-V1 is further 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 is further along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 35 does not bend. Therefore, a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 35 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential 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 disposed outside the outer circumferential wall portion 35. The second V-phase crossover wire 42-V2 is further in contact with 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 is further along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 35 does not bend. Therefore, a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 35 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 35.

[0042] The first W-phase crossover wire 42-W1 passes through the first W-phase lead-out slit 48-W1 and the first W-phase lead-in slit 48-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer circumferential wall portion 35. The first W-phase crossover wire 42-W1 is also in contact with the bottom of the first W-phase lead-out slit 48-W1 and the bottom of the first W-phase lead-in slit 48-W2. The first W-phase crossover wire 42-W1 is also aligned along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 35 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 35 is aligned along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 35.

[0043] The second W-phase crossover wire 42-W2 passes through the second W-phase lead-out slit 48-W3 and the second W-phase lead-in slit 48-W4 so that a portion of the second W-phase crossover wire 42-W2 is disposed outside the outer circumferential wall portion 35. The second W-phase crossover wire 42-W2 is further in contact with the bottom of the second W-phase lead-out slit 48-W3 and the bottom of the second W-phase lead-in slit 48-W4. The second W-phase crossover wire 42-W2 is further along the outer circumferential surface of the outer circumferential wall portion 35 so that a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 35 does not bend. Therefore, a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 35 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential 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 circumferential surface of the outer circumferential wall portion 35. A rib corresponding to a certain crossover wire among the plurality of ribs 49 is disposed on the anti-lead side of a portion of that crossover wire that is disposed on the outside of the outer circumferential 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 that is disposed on the outside of the outer circumferential wall portion 35 from shifting toward the anti-lead side from a predetermined region of the outer circumferential surface of the outer circumferential wall portion 35.

[0045] In the motor 5, the outer peripheral wall portion 35 of the lower insulator 25 is formed in this manner, so that the multiple crossover wires 42 can be separated from each other, the multiple crossover wires 42 can be prevented from contacting each other, and the insulation properties of the multiple crossover wires 42 can be ensured. In addition, in the motor 5, the multiple slits 48 having different depths from two types of slits, that is, multiple slits with a first depth d1 and multiple slits with a second depth d2, are formed, so that the height in the axial direction of the outer peripheral wall portion 35 can be reduced. In the first embodiment, the multiple slits 48 include two types of slits, that is, 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 height in the axial direction of the stator 22 can be reduced because the height of the outer peripheral wall portion 35 is small, and the height in the axial direction of the motor 5 can be reduced. In the compressor 1, the height of the motor 5 is small because the height of the motor 5 is small, so that the height in the axial direction of the compressor 1 can be reduced.

[0046] Stator 22 is manufactured by using an automatic winding machine to properly attach a first U-phase conductor, a second U-phase conductor, a first V-phase conductor, a second V-phase conductor, a first W-phase conductor, and a second W-phase conductor to stator core 23 to which lower insulator 25 and upper insulator 26 are properly attached. The automatic winding machine is equipped with a U-phase conductor nozzle, a V-phase conductor nozzle, and a W-phase conductor nozzle. The U-phase conductor nozzle, the V-phase conductor nozzle, and the W-phase conductor nozzle are provided on the automatic winding machine so as to operate synchronously and in conjunction with one another. The U-phase conductor nozzle, the V-phase conductor nozzle, and the W-phase conductor nozzle are positioned so that, when the U-phase conductor nozzle, the V-phase conductor nozzle, and the 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 with 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 with 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 with 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, and forms 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 the fifth stator core teeth portion 32-5 by using the V-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and forms the first V-phase power supply wire 44-V1 and the 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 the ninth stator core teeth portion 32-9 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and forms the first V-phase power supply wire 44-V1 and the 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-in 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-in 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 has a W-phase conductor nozzle operating in conjunction with the U-phase conductor nozzle to pass the first W-phase conductor through the first W-phase outlet slit 48-W1 and the first W-phase inlet slit 48-W2, thereby forming the first W-phase crossover wire 42-W1 from the first W-phase conductor.

[0049] Next, the automatic winding machine moves the U-phase conductor nozzle to wind the first U-phase conductor counterclockwise around the fourth stator core teeth portion 32-4, place the other end of the first U-phase conductor on the lead side of the fourth stator core teeth portion 32-4, and form the second U-phase winding 24-U2 and the first U-phase neutral conductor 43-U1 from the first U-phase conductor. At this time, the automatic winding machine winds the first V-phase conductor counterclockwise around the eighth stator core teeth portion 32-8, place the other end of the first V-phase conductor on the lead side of the eighth stator core teeth portion 32-8, and form the second V-phase winding 24-V2 and the first V-phase neutral conductor 43-V1 from the first V-phase conductor by the V-phase conductor nozzle working in conjunction with the U-phase conductor nozzle. 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 is arranged on the lead side of the 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 the seventh stator core teeth portion 32-7, and forms the second U-phase power supply wire 44-U2 and the third U-phase winding 24-U3 from the second U-phase conductor. At this time, the automatic winding machine, by linking the V-phase conductor nozzle with the U-phase conductor nozzle, can wind the second V-phase conductor counterclockwise around the eleventh stator core teeth portion 32-11 after one end of the second V-phase conductor is arranged on the lead side of the eleventh stator core teeth portion 32-11, and form the second V-phase power supply wire 44-V2 and the third V-phase winding 24-V3 from the second V-phase conductor. The automatic winding machine further operates such that, after one end of the second W-phase conductor is positioned on the lead side of third stator core teeth portion 32-3, the W-phase conductor nozzle cooperates with the U-phase conductor nozzle to wind the second W-phase conductor counterclockwise around third stator core teeth portion 32-3, thereby forming second W-phase power supply line 44-W2 and 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-in 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 linking the V-phase conductor nozzle with the U-phase conductor nozzle, can pass the second V-phase conductor through the second V-phase lead-in 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 has a W-phase conductor nozzle operating in conjunction with the U-phase conductor nozzle, so that the second W-phase conductor can be passed through the second W-phase outlet side slit 48-W3 and the second W-phase inlet 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 the tenth stator core teeth portion 32-10, places the other end of the second U-phase conductor on the lead side of the tenth stator core teeth portion 32-10, and forms the fourth U-phase winding 24-U4 and the second U-phase neutral conductor 43-U2 from the second U-phase conductor. At this time, the automatic winding machine winds the second V-phase conductor counterclockwise around the second stator core teeth portion 32-2, places the other end of the second V-phase conductor on the lead side of the second stator core teeth portion 32-2, and forms the fourth V-phase winding 24-V4 and the second V-phase neutral conductor 43-V2 from the second V-phase conductor by the V-phase conductor nozzle working in conjunction with the U-phase conductor nozzle. The automatic winding machine further winds the second W-phase conductor counterclockwise around the sixth stator core teeth portion 32-6 by using the W-phase conductor nozzle in conjunction with the U-phase conductor nozzle, and places the other end of the second W-phase conductor on the lead side of the sixth stator core teeth portion 32-6, thereby forming the fourth W-phase winding 24-W4 and the second W-phase neutral wire 43-W2 from the second W-phase conductor.

[0053] That is, the four U-phase slits 48-U1 to 48-U4, the four V-phase slits 48-V1 to 48-V4, and the four W-phase slits 48-W1 to 48-W4 have the same shapes, so that the stator 22 can be easily manufactured by an automatic winding machine. Even when the stator 22 is manufactured by 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 in, for example, 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 rotor 21 rotates around the rotating shaft 16 due to the rotating magnetic field generated by the stator 22. The shaft 3 rotates around the rotating shaft 16 as the rotor 21 rotates, and transmits the rotation of the rotor 21 to the compression section 6. The compression section 6 sucks in low-pressure gas refrigerant from a device in the refrigerant circuit in front of the compressor 1 via the suction pipe 11 as the shaft 3 rotates, and compresses the sucked low-pressure gas refrigerant. The low-pressure gas refrigerant is compressed by the compression section 6 to become a high-pressure gas refrigerant. The compression section 6 supplies the high-pressure gas refrigerant to the space between the compression section 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 downstream of the compressor 1 in the refrigerant circuit. By operating the compressor 1 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, a plurality of windings 24, and an upper insulator 26, similar to the stator 22 of the motor 5 described above, and the lower insulator 25 of the motor 5 described above is replaced with another lower insulator 102. FIG. 6 is a development view showing the stator 101 of the motor of Comparative Example 1. The lower insulator 102 includes 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 is replaced with another outer peripheral wall portion 103. A plurality of slits 104 are formed in the outer peripheral wall portion 103. The plurality of slits 104 include four U-phase slits 104-U1 to 104-U4, four V-phase slits 104-V1 to 104-V4, and four W-phase slits 104-W1 to 104-W4.

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

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

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

[0060] That is, the four V-phase slits 104-V1 to 104-V4 are formed in the same manner as the four U-phase slits 104-U1 to 104-U4. Furthermore, the lower insulator 25 is formed such that, when the lower insulator 25 is rotated 30 degrees around the rotation shaft 16, the four U-phase slits 104-U1 to 104-U4 of the lower insulator 25 after the rotation 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 lower insulator 25 after rotation 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 further differs from the motor 5 of Example 1 in the combination in which the multiple windings 24 are connected. That is, in the first U-phase series-connection section 45-U1, the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection section 45-U2, the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection 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. That is, 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 lead-out slit 48-U1 and the first U-phase lead-in slit 48-U2, and is in contact with the bottom of the first U-phase lead-out slit 48-U1 and the bottom of the first U-phase lead-in slit 48-U2. The first U-phase crossover wire 42-U1 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the first U-phase crossover wire 42-U1 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the first U-phase crossover wire 42-U1 that is disposed 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 lead-out slit 48-U3 and the second U-phase lead-in slit 48-U4, and is in contact with the bottom of the second U-phase lead-out slit 48-U3 and the bottom of the second U-phase lead-in slit 48-U4. The second U-phase crossover wire 42-U2 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the second U-phase crossover wire 42-U2 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the second U-phase crossover wire 42-U2 that is disposed outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0064] The first V-phase crossover wire 42-V1 passes through the first V-phase 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 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0065] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 48-V3 and the second V-phase lead-in slit 48-V4, and is in contact with 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 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the second V-phase crossover wire 42-V2 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the second V-phase crossover wire 42-V2 that is disposed outside the outer circumferential 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 lead-out slit 48-W1 and the first W-phase lead-in slit 48-W2, and is in contact with the bottom of the first W-phase lead-out slit 48-W1 and the bottom of the first W-phase lead-in slit 48-W2. The first W-phase crossover wire 42-W1 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential 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 outlet slit 48-W3 and the second W-phase inlet slit 48-W4, and is in contact with the bottom of the second W-phase outlet slit 48-W3 and the bottom of the second W-phase inlet slit 48-W4. The second W-phase crossover wire 42-W2 further follows the outer circumferential surface of the outer circumferential wall portion 103 so that a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 103 does not sag. Therefore, a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 103 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0068] In the outer peripheral wall portion 103 of the comparative example 1, a plurality of slits 104 are formed from three types of slits having different depths, so that 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 the previously described embodiment 1. That is, in the motor 5 of the previously described embodiment 1, the height of the outer peripheral wall portion 35 can be made smaller than that of the motor of the comparative example 1, and the height of the motor 5 can be made smaller. Also, the second V-phase crossover wire 42-V2 of the motor of the 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, in the motor 5 of the embodiment 1, the crossover wires 42 of different phases can be separated from each other by a large distance, and the crossover wires 42 of different phases can be more reliably prevented from contacting each other, compared to the motor of the comparative example 1.

[0069] In the motor of Comparative Example 1, the depths of the second U-phase lead-out slit 104-U3, the second V-phase lead-out slit 104-V3, and the second W-phase lead-out 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 the fourth depth, which is shallower than the third depth d3, so that the second V-phase crossover wire 42-V2 can be separated from the first W-phase crossover wire 42-W1, and the second V-phase crossover wire 42-V2 can be prevented from contacting the first W-phase crossover wire 42-W1, which is a crossover wire of a different phase. However, in this case, the motor of Comparative Example 1 has a plurality of slits 104 formed from four types of slits with different depths, so that the height of the outer circumferential wall portion 103 becomes even larger.

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

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

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

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

[0074] That is, the four V-phase slits 114-V1 to 114-V4 are formed in the same manner as the four U-phase slits 114-U1 to 114-U4. Furthermore, the lower insulator 112 is formed such that, when the lower insulator 112 is rotated 60 degrees around the rotation shaft 16, the four U-phase slits 114-U1 to 114-U4 of the lower insulator 112 after the rotation 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 lower insulator 112 after rotation 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 further differs from the motor 5 of Example 1 in the combination in which the multiple windings 24 are connected. That is, in the first U-phase series-connection section 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 section 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 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. That is, the multiple windings 24 of the motor of Comparative Example 2 are arranged so that the multiple windings 24 are connected in adjacent poles.

[0076] The first U-phase crossover wire 42-U1 passes through the first U-phase lead-out slit 48-U1 and the first U-phase lead-in slit 48-U2, and is in contact with the bottom of the first U-phase lead-out slit 48-U1 and the bottom of the first U-phase lead-in slit 48-U2. The first U-phase crossover wire 42-U1 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the first U-phase crossover wire 42-U1 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the first U-phase crossover wire 42-U1 that is disposed 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 lead-out slit 48-U3 and the second U-phase lead-in slit 48-U4, and is in contact with the bottom of the second U-phase lead-out slit 48-U3 and the bottom of the second U-phase lead-in slit 48-U4. The second U-phase crossover wire 42-U2 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the second U-phase crossover wire 42-U2 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the second U-phase crossover wire 42-U2 that is disposed outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0078] The first V-phase crossover wire 42-V1 passes through the first V-phase 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 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0079] The second V-phase crossover wire 42-V2 passes through the second V-phase lead-out slit 48-V3 and the second V-phase lead-in slit 48-V4, and is in contact with 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 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the second V-phase crossover wire 42-V2 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the second V-phase crossover wire 42-V2 that is disposed outside the outer circumferential 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 lead-out slit 48-W1 and the first W-phase lead-in slit 48-W2, and is in contact with the bottom of the first W-phase lead-out slit 48-W1 and the bottom of the first W-phase lead-in slit 48-W2. The first W-phase crossover wire 42-W1 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential 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 outlet slit 48-W3 and the second W-phase inlet slit 48-W4, and is in contact with the bottom of the second W-phase outlet slit 48-W3 and the bottom of the second W-phase inlet slit 48-W4. The second W-phase crossover wire 42-W2 further follows the outer circumferential surface of the outer circumferential wall portion 113 so that a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 113 does not sag. Therefore, a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 113 is inclined with respect to a plane perpendicular to the rotation shaft 16.

[0082] In the outer peripheral wall portion 113 of the comparative example 2, a plurality of slits 114 are formed from three types of slits having different depths, and therefore 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 the above-described embodiment 1. That is, in the motor 5 of the embodiment 1, the height of the outer peripheral wall portion 35 can be made smaller than that of the motor of the comparative example 2, and the height of the motor 5 can be made smaller. Also, the second U-phase crossover wire 42-U2 of the motor of the 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, in the motor 5 of the embodiment 1, the crossover wires 42 of different phases can be separated from each other by a large distance, and the crossover wires 42 of different phases can be more reliably prevented from contacting each other, compared to the motor of the comparative example 2.

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

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

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

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

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

[0088] That is, the four V-phase slits 124-V1 to 124-V4 are formed in the same manner as the four U-phase slits 124-U1 to 124-U4. Furthermore, the lower insulator 112 is formed such that, when the lower insulator 112 is rotated 210 degrees around the rotation shaft 16, the four U-phase slits 124-U1 to 124-U4 of the lower insulator 112 after the rotation 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 lower insulator 112 after rotation 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 further differs from the motor 5 of Example 1 in the combination in which the multiple windings 24 are connected. That is, in the first U-phase series-connection section 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 section 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 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. That is, 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 outgoing slit 124-U1 and the first U-phase ingoing slit 124-U2, and is in contact with the bottom of the first U-phase outgoing slit 124-U1 and the bottom of the first U-phase ingoing slit 124-U2. The first U-phase crossover wire 42-U1 further follows the outer circumferential surface of the outer circumferential wall portion 123 so that a portion of the first U-phase crossover wire 42-U1 that is disposed outside the outer circumferential wall portion 123 does not bend. Therefore, a portion of the first U-phase crossover wire 42-U1 that is disposed 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 lead-out slit 124-U3 and the second U-phase lead-in slit 124-U4, and is in contact with the bottom of the second U-phase lead-out slit 124-U3 and the bottom of the second U-phase lead-in slit 124-U4. The second U-phase crossover wire 42-U2 further follows the outer circumferential surface of the outer circumferential wall portion 123 so that a portion of the second U-phase crossover wire 42-U2 that is disposed outside the outer circumferential wall portion 123 does not sag. Therefore, a portion of the second U-phase crossover wire 42-U2 that is disposed 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 further follows the outer circumferential surface of the outer circumferential wall portion 123 so that a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 123 does not bend. Therefore, a portion of the first V-phase crossover wire 42-V1 that is disposed outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

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

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

[0095] The second W-phase crossover wire 42-W2 passes through the second W-phase outlet slit 124-W3 and the second W-phase inlet slit 124-W4, and is in contact with the bottom of the second W-phase outlet slit 124-W3 and the bottom of the second W-phase inlet slit 124-W4. The second W-phase crossover wire 42-W2 further follows the outer circumferential surface of the outer circumferential wall portion 123 so that a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 123 does not sag. Therefore, a portion of the second W-phase crossover wire 42-W2 that is disposed outside the outer circumferential wall portion 123 is inclined with respect to a plane perpendicular to the rotation shaft 16.

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

[0097] [Effects of Motor 5 in Example 1] The motor 5 of the first embodiment includes a rotor 21 and a stator 22 that generates a magnetic field that rotates the rotor 21 around the rotating shaft 16. The stator 22 includes a stator core 23, an outer peripheral wall portion 35 of a cylindrical lower insulator 25, and a plurality of windings 24. The stator core 23 includes an annular yoke portion 31 that surrounds the outer peripheral side of the rotor 21, and a plurality of stator core teeth portions 32-1 to 32-12 that protrude from the inner peripheral side of the yoke portion 31 toward the rotor 21 and are arranged in the circumferential direction. The outer peripheral wall portion 35 is disposed at one end of the stator core 23 in the axial direction that is parallel to the rotating shaft 16. The plurality of windings 24 are formed by winding a conductor around each of the plurality of stator core teeth portions 32-1 to 32-12. The multiple windings 24 include four U-phase windings 24-U1 to 24-U4, four V-phase windings 24-V1 to 24-V4, and four W-phase windings 24-W1 to 24-W4, and are arranged such 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 among 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 portion 35 of the lower insulator 25. The crossover wires connected to the winding ends of the windings are drawn out from a plurality of draw-out side slits among the plurality of slits 48. The crossover wires connected to the winding starts of the windings are drawn in from a plurality of draw-in side slits among the plurality of slits 48. Each of the plurality of crossover wires 42 passes through two slits, a draw-out side slit and a draw-in side slit, formed in the outer peripheral wall portion 35 of the lower insulator 25, and a portion of the crossover wires is disposed on the outer peripheral side of the outer peripheral wall portion 35. Furthermore, in each of the three phases, of the four slits, the draw-out side slit of the first crossover wire, the draw-in side slit of the first crossover wire, the draw-out side slit of the second crossover wire, and the draw-in side slit of the second crossover wire, at least two slits have the same depth.

[0100] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of the first embodiment, the 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, making it possible to achieve both miniaturization of the motor 5 and ensuring insulation.

[0101] Furthermore, the portion of the crossover wire of motor 5 of embodiment 1 that is disposed on the outer circumferential side of outer circumferential wall portion 35 of lower insulator 25 is positioned in the axial direction by contacting the bottom of the slit. In motor 5 of embodiment 1, even when a groove that fits with the crossover wire is not formed in the outer circumferential surface of outer circumferential wall portion 35, the crossover wire can be disposed in a predetermined region of the outer circumferential surface of outer circumferential 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 third coil in the circumferential direction. In the first embodiment, one permanent magnet 39 is provided per pole, and the rotor 21 has eight permanent magnets 39 in total. Although not shown, one pole may have multiple permanent magnets 39, and for example, one pole may be configured by arranging two permanent magnets 39 in a V shape.

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

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

[0105] In addition, the combination of the depths of the four slits is common to each of the three phases in the motor 5 of Example 1. In the winding process of the automatic winding machine that performs a pre-specified operation, the combination of the depths of the four slits is common to the three phases in the motor 5 of Example 1, so that it is not necessary to change the operation for each phase, and the winding process can be simplified.

[0106] In addition, in 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 U-phase crossover wire 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, 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 and the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the windings 24 of the motor 5 in the first embodiment are connected in adjacent pole connection.

[0107] In addition, the motor 5 of the first embodiment is formed so that the shape of the four V-phase slits 48-V1 to 48-V4 matches the shape of the four U-phase slits 48-U1 to 48-U4, and the shape of the four W-phase slits 48-W1 to 48-W4 matches the shape of the four U-phase slits 48-U1 to 48-U4. That is, the multiple slits 48 are formed so that when the outer circumferential wall portion 35 of the lower insulator 25 virtually rotates around the rotation shaft 16, the four U-phase slits 48-U1 to 48-U4 after the rotation match the four V-phase slits 48-V1 to 48-V4 before the rotation and match the four W-phase slits 48-W1 to 48-W4 before the rotation. The motor 5 of the first embodiment can form multiple windings 24 corresponding to each of the three phases by three conductors respectively supplied from three nozzles of the automatic winding machine whose operations are synchronized and linked.

[0108] Moreover, the motor 5 of the first embodiment is formed so that the four U-phase slits 48-U1 to 48-U4 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 by virtually 120 degrees in the circumferential direction around the rotation shaft 16. The motor 5 of the first embodiment is further formed so that the four U-phase slits 48-U1 to 48-U4 coincide with the four W-phase slits 48-W1 to 48-W4 when the outer peripheral wall portion 35 of the lower insulator 25 is rotated by virtually 240 degrees in the circumferential direction around the rotation shaft 16. In this case, the motor 5 of the first embodiment can have two types of depths for the four U-phase slits 48-U1 to 48-U4.

[0109] In the motor 5 of the first embodiment, the depth of two of the four U-phase slits 48-U1 to 48-U4 is the first depth d1, and the depth of the other two U-phase slits is the second depth d2, which 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, the motor 5 of the first embodiment can reduce the axial height of the outer peripheral wall portion 35 of the lower insulator 25 by providing two different depths for the slits that hold the crossover wires while ensuring the insulation distance between the crossover wires of different phases, and can thus achieve both miniaturization of the motor 5 and ensuring the insulation.

[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 the 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 the second depth d2, which 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 of the slits of the three phases is 120 degrees in the adjacent pole connection, the number of types of slit depths is reduced to two, and the insulation distance can be secured, and the jumper wires of different phases can be prevented from running over.

[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. At this time, the motor 5 of the first embodiment can restrict the movement of the crossover wire in the axial direction. EXAMPLES

[0112] As shown in FIG. 9, the motor of the second embodiment has a different combination of the windings 24 connected thereto from that of the motor 5 of the first embodiment. FIG. 9 is a connection 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 section 45-U1, the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series-connection section 45-U2, the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series-connection 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.

[0113] That is, as shown in Fig. 10, the multiple windings 24 are arranged in the circumferential direction such that the multiple windings 24 are connected in an alternate pole manner. Fig. 10 is a development view showing a stator 22 of a motor of the second embodiment. That is, the multiple windings 24 are arranged such that a winding of the same phase as two of the multiple windings 24 connected in series is disposed between the two windings in the circumferential direction. For example, the four U-phase windings 24-U1 to 24-U4 are arranged such that the second U-phase winding 24-U2, which is a winding of the same phase, is disposed between the first U-phase winding 24-U1 and the third U-phase winding 24-U3 constituting the first U-phase series-connected portion 45-U1 in the circumferential direction.

[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 includes a plurality of insulator teeth portions 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 described above is replaced with another outer peripheral wall portion 52. The outer peripheral wall portion 52 has a plurality of slits 54 formed from a lower end of the outer peripheral wall portion 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 on the opposite side to the lead of the first stator core teeth 32-1, and the depth of the first U-phase lead-out slit 54-U1 is formed to a first depth d1. The first U-phase lead-in slit 54-U2 is formed in a portion of the outer wall 52 on the opposite side to the lead of the seventh stator core teeth 32-7, and the depth of the first U-phase lead-in slit 54-U2 is formed to a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-out slit 54-U3 is formed in a portion of the outer wall 52 on the opposite lead side of the fourth stator core teeth 32-4, and the second U-phase lead-out slit 54-U3 has a second depth d2. The second U-phase lead-in slit 54-U4 is formed in a portion of the outer wall 52 on the opposite lead side of the tenth stator core teeth 32-10, and the second U-phase lead-in slit 54-U4 has a third depth d3. The third depth d3 is shallower than the second depth d2.

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

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

[0118] That is, the four V-phase slits 54-V1 to 54-V4 are formed in the same manner as the four U-phase slits 54-U1 to 54-U4. Furthermore, the lower insulator 25 is formed such that, when the lower insulator 25 is rotated 120 degrees around the rotation shaft 16, the four U-phase slits 54-U1 to 54-U4 of the lower insulator 25 after the rotation 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 lower insulator 25 after rotation 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 lead-out slit 54-U1 and the first U-phase lead-in slit 54-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 52. The first U-phase crossover wire 42-U1 is further in contact with the bottom of the first U-phase lead-out slit 54-U1 and the bottom of the first U-phase lead-in slit 54-U2. The first U-phase crossover wire 42-U1 is further along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 52 does not bend. Therefore, a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 52 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0120] The second U-phase crossover wire 42-U2 passes through the second U-phase lead-out slit 54-U3 and the second U-phase lead-in slit 54-U4 so that a portion of the second U-phase crossover wire 42-U2 is disposed outside the outer circumferential wall portion 52. The second U-phase crossover wire 42-U2 is further in contact with the bottom of the second U-phase lead-out slit 54-U3 and the bottom of the second U-phase lead-in slit 54-U4. The second U-phase crossover wire 42-U2 is further arranged along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 52 does not bend. Therefore, a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 52 is arranged along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0121] The first V-phase crossover wire 42-V1 passes through the first V-phase lead-out slit 54-V1 and the first V-phase lead-in slit 54-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 52. The first V-phase crossover wire 42-V1 is further in contact with the bottom of the first V-phase lead-out slit 54-V1 and the bottom of the first V-phase lead-in slit 54-V2. The first V-phase crossover wire 42-V1 is further along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 52 does not bend. Therefore, a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 52 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[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 disposed outside the outer circumferential wall portion 52. The second V-phase crossover wire 42-V2 is further in contact with 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 is further along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 52 does not bend. Therefore, a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 52 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0123] The first W-phase crossover wire 42-W1 passes through the first W-phase lead-out slit 54-W1 and the first W-phase lead-in slit 54-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer circumferential wall portion 52. The first W-phase crossover wire 42-W1 is also in contact with the bottom of the first W-phase lead-out slit 54-W1 and the bottom of the first W-phase lead-in slit 54-W2. The first W-phase crossover wire 42-W1 is also aligned along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 52 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 52 is aligned along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0124] The second W-phase crossover wire 42-W2 passes through the second W-phase lead-out slit 54-W3 and the second W-phase lead-in slit 54-W4 so that a portion of the second W-phase crossover wire 42-W2 is disposed outside the outer circumferential wall portion 52. The second W-phase crossover wire 42-W2 is further in contact with the bottom of the second W-phase lead-out slit 54-W3 and the bottom of the second W-phase lead-in slit 54-W4. The second W-phase crossover wire 42-W2 is further arranged along the outer circumferential surface of the outer circumferential wall portion 52 so that a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 52 does not bend. Therefore, a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 52 is arranged along a predetermined region of the outer circumferential surface of the outer circumferential 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 circumferential surface of the outer circumferential wall portion 52. A rib corresponding to a certain crossover wire among the plurality of ribs 55 is disposed on the anti-lead side of a portion of the crossover wire that is disposed on the outside of the outer circumferential wall portion 52, and is in contact with the portion. Therefore, the stator 22 can prevent the portion of the plurality of crossover wires 42 that is disposed on the outside of the outer circumferential wall portion 52 from shifting toward the anti-lead side from a predetermined region of the outer circumferential surface of the outer circumferential wall portion 52.

[0126] The stator 22 is provided with 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 third U-phase winding 24-U3 among 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 second U-phase winding 24-U2 and the fourth U-phase winding 24-U4. The stator 22 is provided with two crossover wires for each of the U and V phases, similar to the U phase.

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

[0128] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of the second embodiment, the depths of the four types of slits that hold the jumper 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 jumper wires, thereby achieving both miniaturization of the 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 part 45-U1 and a second U-phase series connection part 45-U2. In the first U-phase series connection part 45-U1, the first U-phase winding 24-U1 and the third U-phase winding 24-U3 of the four U-phase windings 24-U1 to 24-U4 are connected in series. In the second U-phase series connection part 45-U2, the second U-phase winding 24-U2 and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are connected in series. The first U-phase series connection part 45-U1 and the second U-phase series connection part 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] In addition, in the motor 5 of the second embodiment, 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 U-phase crossover wire of the two U-phase crossover wires 42-U1 to 42-U2, connects the first U-phase winding 24-U1 to the third U-phase winding 24-U3, and the second U-phase crossover wire 42-U2, which is the other U-phase crossover wire of the two U-phase crossover wires 42-U1 to 42-U2, connects the second U-phase winding 24-U2 to the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the multiple windings 24 of the motor 5 in the first embodiment are connected in an alternate pole manner.

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

[0132] In the motor 5 of the second embodiment, the depths of two U-phase slits (54-U2, 54-U3) among the four U-phase slits 54-U1 to 54-U4 are 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, the motor 5 of the second embodiment can reduce the axial height of the outer circumferential wall portion 35 of the lower insulator 25 by providing three different depths for the slits that hold the crossover wires while ensuring the insulation distance between the crossover wires of different phases. This allows the motor 5 to be compact and have good insulation properties at the same time.

[0133] In the motor 5 of the second embodiment, the depth of the second U-phase lead-out slit 54-U3 and the depth of the first U-phase lead-in slit 54-U2 among the four U-phase slits 54-U1 to 54-U4 are 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 of the three-phase slits is 120 degrees in the remote pole connection, the number of types of slit depths is reduced to three, while ensuring the insulation distance and preventing the jumper wires of different phases from riding up.

[0134] The motor of the second embodiment is formed in this manner, and thus, like the motor 5 of the first embodiment, the mutual insulation of the multiple crossover wires 42 can be ensured. In addition, the motor of the second embodiment has multiple slits 54 formed from three types of slits, namely, multiple slits with a first depth d1, multiple slits with a second depth d2, and multiple slits with a third depth d3, and thus the height in the axial direction of the outer peripheral wall portion 52 can be reduced. The motor of the second embodiment has a small height of the outer peripheral wall portion 52, and thus the height in the axial direction can be reduced. The compressor provided with the motor of the second embodiment has a small height of the motor of the second embodiment, and thus the height in the axial direction can be reduced. EXAMPLES

[0135] As shown in FIG. 11, the motor of the third embodiment has a different combination of the windings 24 connected thereto from that of the motor 5 of the first embodiment. FIG. 11 is a connection 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 section 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 section 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 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. That is, the multiple windings 24 are lined up in the circumferential direction such 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] The first U-phase power line 44-U1 and the second U-phase power line 44-U2 are routed in a connected state during the winding process as shown in Fig. 12, which will be described later, and then, after the winding process, the first U-phase power line 44-U1 and the second U-phase power line 44-U2 are separated as shown in Fig. 11, with both ends of the separated lines connected to the U-phase power supply. The first V-phase power line 44-V1 and the second V-phase power line 44-V2 are routed in a connected state during the winding process, and then, after the winding process, the first V-phase power line 44-V1 and the second V-phase power line 44-V2 are separated as shown in Fig. 11, with both ends of the separated lines connected to the V-phase power supply. The first W-phase power line 44-W1 and the second W-phase power line 44-W2 are routed in a connected state during the winding process, and then after the winding process, as shown in FIG. 11, the first W-phase power line 44-W1 and the second W-phase power line 44-W2 are separated so that they are separated, and both ends of the separated lines are each connected to a W-phase power supply.

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

[0138] As shown in Fig. 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 described above, and the outer peripheral wall portion 35 of the lower insulator 25 described above is replaced with another outer peripheral wall portion 62. The outer peripheral wall portion 62 has a plurality of slits 64 formed from a lower end of the outer peripheral wall portion 62 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 lead side of the first stator core teeth 32-1, and the depth of the first U-phase lead-out slit 64-U1 is formed to a 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 lead side of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-in slit 64-U2 is formed to a first depth d1. The second U-phase lead-out side slit 64-U3 is formed in a portion of the outer wall 62 on the opposite lead side of the seventh stator core teeth 32-7, and the depth of the second U-phase lead-out side slit 64-U3 is formed to a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-in side slit 64-U4 is formed in a portion of the outer wall 62 on the opposite lead side of the tenth stator core teeth 32-10, and the depth of the second U-phase lead-in side slit 64-U4 is formed to a second depth d2. The U-phase connecting wire lead-out side slit 64-U5 is formed in a portion of the outer wall 62 on the opposite lead side of the fourth stator core teeth 32-4, and the depth of the U-phase connecting wire lead-out side slit 64-U5 is formed to a third depth d3. In the third embodiment, the third depth d3 is shallower than the first depth d1 and deeper than the second depth d2. The U-phase connecting wire inlet side slit 64-U6 is formed in a portion of the outer wall portion 62 on the opposite lead side of the seventh stator core teeth portion 32-7, and the depth of the U-phase connecting wire inlet side slit 64-U6 is formed to a third depth d3.

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

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

[0142] That is, the six V-phase slits 64-V1 to 64-V6 are formed in the same manner as the six U-phase slits 64-U1 to 64-U6. Furthermore, the lower insulator 25 is formed 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 lower insulator 25 after the rotation 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 lower insulator 25 after rotation 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 lead-out slit 64-U1 and the first U-phase lead-in slit 64-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 62. The first U-phase crossover wire 42-U1 is further in contact with the bottom of the first U-phase lead-out slit 64-U1 and the bottom of the first U-phase lead-in slit 64-U2. The first U-phase crossover wire 42-U1 is further along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 62 does not bend. Therefore, a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0144] The second U-phase crossover wire 42-U2 passes through the second U-phase lead-out slit 64-U3 and the second U-phase lead-in slit 64-U4 so that a portion of the second U-phase crossover wire 42-U2 is disposed outside the outer circumferential wall portion 62. The second U-phase crossover wire 42-U2 is further in contact with the bottom of the second U-phase lead-out slit 64-U3 and the bottom of the second U-phase lead-in slit 64-U4. The second U-phase crossover wire 42-U2 is further along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 62 does not bend. Therefore, a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[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 disposed outside the outer circumferential wall portion 62. The U-phase connecting wire 60-U is further in contact with 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 is further arranged along the outer circumferential surface of the outer circumferential wall portion 62 so that the portion of the U-phase connecting wire 60-U disposed outside the outer circumferential wall portion 62 does not bend. Therefore, the portion of the U-phase connecting wire 60-U disposed outside the outer circumferential wall portion 62 is arranged along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0146] The first V-phase crossover wire 42-V1 passes through the first V-phase lead-out slit 64-V1 and the first V-phase lead-in slit 64-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 62. The first V-phase crossover wire 42-V1 is further in contact with the bottom of the first V-phase lead-out slit 64-V1 and the bottom of the first V-phase lead-in slit 64-V2. The first V-phase crossover wire 42-V1 is further along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 62 does not bend. Therefore, a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0147] The second V-phase crossover wire 42-V2 passes through the second V-phase 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 disposed outside the outer circumferential wall portion 62. The second V-phase crossover wire 42-V2 is further in contact with 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 is further along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 62 does not bend. Therefore, a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0148] The V-phase connecting wire 60-V passes through the V-phase connecting wire lead-out side slit 64-V5 and the V-phase connecting wire lead-in side slit 64-V6 so that a part of the V-phase connecting wire 60-V is disposed outside the outer peripheral wall portion 62. The V-phase connecting wire 60-V is further in contact with the bottom of the V-phase connecting wire lead-out side slit 64-V5 and the bottom of the V-phase connecting wire lead-in side slit 64-V6. The V-phase connecting wire 60-V further follows the outer peripheral surface of the outer peripheral wall portion 62 so that the part of the V-phase connecting wire 60-V disposed outside the outer peripheral wall portion 62 does not bend. Therefore, the part of the V-phase connecting wire 60-V 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.

[0149] The first W-phase crossover wire 42-W1 passes through the first W-phase lead-out slit 64-W1 and the first W-phase lead-in slit 64-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer circumferential wall portion 62. The first W-phase crossover wire 42-W1 is also in contact with the bottom of the first W-phase lead-out slit 64-W1 and the bottom of the first W-phase lead-in slit 64-W2. The first W-phase crossover wire 42-W1 is also aligned along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 62 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 62 is aligned along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0150] The second W-phase crossover wire 42-W2 passes through the second W-phase lead-out slit 64-W3 and the second W-phase lead-in slit 64-W4 so that a portion of the second W-phase crossover wire 42-W2 is disposed outside the outer circumferential wall portion 62. The second W-phase crossover wire 42-W2 is further in contact with the bottom of the second W-phase lead-out slit 64-W3 and the bottom of the second W-phase lead-in slit 64-W4. The second W-phase crossover wire 42-W2 is further along the outer circumferential surface of the outer circumferential wall portion 62 so that a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 62 does not bend. Therefore, a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[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 disposed outside the outer circumferential wall portion 62. The W-phase connecting wire 60-W is also in contact with 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 further follows the outer circumferential surface of the outer circumferential wall portion 62 so that the portion of the W-phase connecting wire 60-W disposed outside the outer circumferential wall portion 62 does not bend. Therefore, the portion of the W-phase connecting wire 60-W disposed outside the outer circumferential wall portion 62 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 62.

[0152] The motor of the third embodiment is formed in this manner, so that the multiple crossover wires 42, the U-phase connecting wire 60-U, the V-phase connecting wire 60-V, and the W-phase connecting wire 60-W can be separated from each other, and the multiple crossover wires 42, the U-phase connecting wire 60-U, the V-phase connecting wire 60-V, and the W-phase connecting wire 60-W can be prevented from contacting each other. In addition, the motor of the third embodiment has multiple slits 64 formed from three types of slits, namely, multiple slits with a first depth d1, multiple slits with a second depth d2, and multiple slits with a third depth d3, so that the height of the outer peripheral wall portion 62 in the axial direction can be reduced. The motor of the third embodiment has a small height of the outer peripheral wall portion 62, so that the height of the motor of the third embodiment can be reduced. The compressor provided with the motor of the third embodiment has a small height of the motor of the third embodiment, so that the height of the motor of the third embodiment can be reduced in the axial direction.

[0153] The stator of the motor of the third embodiment can be produced by using an automatic winding machine, similar to the stator 22 of the motor 5 of the first embodiment described above. That is, the stator core 23 to which the lower insulator 61 and the upper insulator 26 are attached is first set in the automatic winding machine so that the central axis of the yoke portion 31 of the stator core 23 overlaps with the central axis of the automatic winding machine. After one end of the U-phase conductor is disposed 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, and forms the first U-phase neutral wire 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 the 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 the first V-phase neutral conductor 43-V1 and the first V-phase winding 24-V1 from the V-phase conductor. The automatic winding machine winds the W-phase conductor counterclockwise around the 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 the first V-phase neutral conductor 43-V1 and the first W-phase winding 24-W1 from the W-phase conductor.

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

[0155] Next, the automatic winding machine moves the U-phase conductor nozzle to wind the U-phase conductor counterclockwise around the fourth stator core teeth 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 teeth portion 32-8 by the V-phase conductor nozzle working 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 teeth portion 32-12 by the W-phase conductor nozzle working 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 of 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 having the V-phase conductor nozzle work 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 of 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, by having the W-phase conductor nozzle work in conjunction with the U-phase conductor nozzle, is able 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 of 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 the seventh stator core teeth portion 32-7, and forms the first U-phase power supply wire 44-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 place a portion of the V-phase conductor on the lead side of the seventh stator core teeth portion 32-7, and form the first V-phase power supply wire 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 the seventh stator core teeth portion 32-7, and form the first W-phase power supply wire 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 teeth portion 32-7, thereby forming the second U-phase power supply wire 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 teeth portion 32-11 by the V-phase conductor nozzle working in conjunction with the U-phase conductor nozzle, thereby forming the second V-phase power supply wire 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 teeth portion 32-3 by the W-phase conductor nozzle working in conjunction with the U-phase conductor nozzle, thereby forming the second W-phase power supply wire 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 linking the V-phase conductor nozzle with the U-phase conductor nozzle, can pass the V-phase conductor through the second V-phase lead-out slit 64-V3 and the second V-phase lead-in slit 64-V4 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the second V-phase crossover wire 42-V2 from the V-phase conductor. The automatic winding machine further enables the W-phase conductor nozzle to operate in conjunction with the U-phase conductor nozzle so as to pass the W-phase conductor through the second W-phase outlet side slit 64-W3 and the second W-phase inlet side slit 64-W4 in the outer peripheral wall portion 35 of the lower insulator 61, thereby forming the second W-phase crossover wire 42-W2 from the W-phase conductor.

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

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

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

[0163] As shown in FIG. 13, the motor of the fourth embodiment has a different combination of the windings 24 connected thereto from that of the motor 5 of the first embodiment. FIG. 13 is a connection 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 section 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 section 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 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. That is, the multiple windings 24 are lined up in the circumferential direction such that the multiple windings 24 are connected to adjacent poles, as shown in Fig. 14. Fig. 14 is a development view showing the stator 22 of the motor of the fourth embodiment.

[0164] In the motor of the fourth embodiment, the lower insulator 25 of the motor 5 of the first embodiment is replaced with another lower insulator 71. The lower insulator 71 includes 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 described above is replaced with another outer peripheral wall portion 72. The outer peripheral wall portion 72 is formed with a plurality of slits 74 that are formed from a 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 peripheral wall 72 on the opposite side to the lead of the first stator core teeth 32-1, and the depth of the first U-phase lead-out slit 74-U1 is formed to a first depth d1. The first U-phase lead-in slit 74-U2 is formed in a portion of the outer peripheral wall 72 on the opposite side to the lead of the fourth stator core teeth 32-4, and the depth of the first U-phase lead-in slit 74-U2 is formed to a second depth d2. The second depth d2 is shallower than the first depth d1. The second U-phase lead-out slit 74-U3 is formed in a portion of the outer wall 72 on the opposite lead side of the seventh stator core teeth 32-7, and the second U-phase lead-out slit 74-U3 has a first depth d1. The second U-phase lead-in slit 74-U4 is formed in a portion of the outer wall 72 on the opposite lead side of the tenth stator core teeth 32-10, and the second U-phase lead-in slit 74-U4 has a second depth d2.

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

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

[0168] That is, the four V-phase slits 74-V1 to 74-V4 are formed in the same manner as the four U-phase slits 74-U1 to 74-U4. Furthermore, the lower insulator 71 is formed such that, when the lower insulator 71 is rotated 30 degrees around the rotation shaft 16, the four U-phase slits 74-U1 to 74-U4 of the lower insulator 71 after the rotation 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 lower insulator 71 after rotation 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 lead-out slit 74-U1 and the first U-phase lead-in slit 74-U2 so that a portion of the first U-phase crossover wire 42-U1 is disposed outside the outer circumferential wall portion 72. The first U-phase crossover wire 42-U1 is further in contact with the bottom of the first U-phase lead-out slit 74-U1 and the bottom of the first U-phase lead-in slit 74-U2. The first U-phase crossover wire 42-U1 is further along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 72 does not bend. Therefore, a portion of the first U-phase crossover wire 42-U1 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0170] The second U-phase crossover wire 42-U2 passes through the second U-phase lead-out slit 74-U3 and the second U-phase lead-in slit 74-U4 so that a portion of the second U-phase crossover wire 42-U2 is disposed outside the outer circumferential wall portion 72. The second U-phase crossover wire 42-U2 is further in contact with the bottom of the second U-phase lead-out slit 74-U3 and the bottom of the second U-phase lead-in slit 74-U4. The second U-phase crossover wire 42-U2 is further aligned along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 72 does not bend. Therefore, a portion of the second U-phase crossover wire 42-U2 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0171] The first V-phase crossover wire 42-V1 passes through the first V-phase lead-out slit 74-V1 and the first V-phase lead-in slit 74-V2 so that a portion of the first V-phase crossover wire 42-V1 is disposed outside the outer circumferential wall portion 72. The first V-phase crossover wire 42-V1 is further in contact with the bottom of the first V-phase lead-out slit 74-V1 and the bottom of the first V-phase lead-in slit 74-V2. The first V-phase crossover wire 42-V1 is further along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 72 does not bend. Therefore, a portion of the first V-phase crossover wire 42-V1 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0172] The second V-phase crossover wire 42-V2 passes through the second V-phase 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 disposed outside the outer circumferential wall portion 72. The second V-phase crossover wire 42-V2 is further in contact with 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 is further along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 72 does not bend. Therefore, a portion of the second V-phase crossover wire 42-V2 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0173] The first W-phase crossover wire 42-W1 passes through the first W-phase lead-out slit 74-W1 and the first W-phase lead-in slit 74-W2 so that a portion of the first W-phase crossover wire 42-W1 is disposed outside the outer circumferential wall portion 72. The first W-phase crossover wire 42-W1 is also in contact with the bottom of the first W-phase lead-out slit 74-W1 and the bottom of the first W-phase lead-in slit 74-W2. The first W-phase crossover wire 42-W1 is also aligned along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 72 does not sag. Therefore, a portion of the first W-phase crossover wire 42-W1 that is disposed outside the outer circumferential wall portion 72 is aligned along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0174] The second W-phase crossover wire 42-W2 passes through the second W-phase lead-out slit 74-W3 and the second W-phase lead-in slit 74-W4 so that a portion of the second W-phase crossover wire 42-W2 is disposed outside the outer circumferential wall portion 72. The second W-phase crossover wire 42-W2 is further in contact with the bottom of the second W-phase lead-out slit 74-W3 and the bottom of the second W-phase lead-in slit 74-W4. The second W-phase crossover wire 42-W2 is further aligned along the outer circumferential surface of the outer circumferential wall portion 72 so that a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 72 does not sag. Therefore, a portion of the second W-phase crossover wire 42-W2 disposed outside the outer circumferential wall portion 72 is disposed along a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[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 circumferential surface of the outer circumferential wall portion 72. A rib corresponding to a certain crossover wire among the plurality of ribs 75 is disposed on the anti-lead side of a portion of the crossover wire that is disposed on the outside of the outer circumferential wall portion 72, and is in contact with the portion. Therefore, the stator 22 can prevent the portion of the plurality of crossover wires 42 that is disposed on the outside of the outer circumferential wall portion 72 from shifting toward the anti-lead side from a predetermined region of the outer circumferential surface of the outer circumferential wall portion 72.

[0176] The stator 22 is provided with 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 among 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 is also provided with 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 portion 72 of the lower insulator 71. The crossover wires connected to the end of the winding are drawn out from a plurality of draw-out side slits among the plurality of slits 74. The crossover wires connected to the beginning of the winding are drawn in from a plurality of draw-in side slits among the plurality of slits 74. Each of the plurality of crossover wires 42 passes through two slits, a draw-out side slit and a draw-in side slit, formed in the outer peripheral wall portion 72 of the lower insulator 71, and a portion of the crossover wires is disposed on the outer peripheral side of the outer peripheral wall portion 72. Furthermore, in each of the three phases, the depths of at least two of the four slits, the draw-out side slit of the first crossover wire, the draw-in side slit of the first crossover wire, the draw-out side slit of the second crossover wire, and the draw-in side slit of the second crossover wire, are the same.

[0178] The four types of slits are formed from three or less types of slits with different depths, with at least two types of slits having the same depth. In the motor 5 of the fourth embodiment, the depths of the four types of slits that hold the jumper wires do not all need to be different, and the axial height of the outer circumferential wall portion 72 can be reduced while ensuring the insulation distance between the jumper wires, thereby achieving both miniaturization of the 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 part 45-U1 and a second U-phase series connection part 45-U2. In the first U-phase series connection part 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 part 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 part 45-U1 and the second U-phase series connection part 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] In addition, in the motor 5 of Example 4, when the first U-phase winding 24-U1, the second U-phase winding 24-U2, the third U-phase winding 24-U3, and the fourth U-phase winding 24-U4 of the four U-phase windings 24-U1 to 24-U4 are arranged in this order in the circumferential direction, the first U-phase crossover wire 42-U1, which is one U-phase crossover wire 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, 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 and the fourth U-phase winding 24-U4. The four V-phase windings 24-V1 to 24-V4 and the four W-phase windings 24-W1 to 24-W4 are connected in the same manner as the four U-phase windings 24-U1 to 24-U4. That is, the windings 24 of the motor 5 of the fourth embodiment are connected in adjacent pole connection.

[0181] In addition, the motor 5 of the fourth embodiment is formed so that the four V-phase slits 74-V1 to 74-V4 are shaped to match the four U-phase slits 74-U1 to 74-U4, and the four W-phase slits 74-W1 to 74-W4 are shaped to match the four U-phase slits 74-U1 to 74-U4. That is, the multiple slits 74 are formed so that when the outer circumferential wall portion 72 of the lower insulator 71 virtually rotates around the rotation shaft 16, the four U-phase slits 74-U1 to 74-U4 after the rotation match the four V-phase slits 74-V1 to 74-V4 before the rotation or match the four W-phase slits 74-W1 to 74-W4 before the rotation. The motor 5 of the first embodiment can form multiple windings 24 corresponding to each of the three phases by three conductors respectively supplied from three nozzles of the automatic winding machine whose operations are synchronized and linked.

[0182] Moreover, the motor 5 of the fourth embodiment is formed so that the four U-phase slits 74-U1 to 74-U4 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 around the rotating shaft 16. The motor 5 of the fourth embodiment is further formed so that the four U-phase slits 74-U1 to 74-U4 coincide with the four W-phase slits 74-W1 to 74-W4 when the outer peripheral wall portion 72 of the lower insulator 71 is rotated virtually 60 (=30+30) degrees in the circumferential direction around the rotating shaft 16. In this case, the motor 5 of the fourth embodiment can have two types of depths for the four U-phase slits 74-U1 to 74-U4.

[0183] In the motor 5 of the fourth embodiment, the depth of two of the four U-phase slits 74-U1 to 74-U4 is the first depth d1, and the depth of the other two U-phase slits is the second depth d2, which 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, the motor 5 of the fourth embodiment can reduce the axial height of the outer circumferential wall portion 72 of the lower insulator 71 by providing two different depths for the slits that hold the crossover wires while ensuring the insulation distance between the crossover wires of different phases, and can thus achieve both miniaturization of the motor 5 and ensuring the insulation.

[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 the 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 the second depth d2, which 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 of the slits of the three phases is 30 degrees in the adjacent pole connection, the number of types of slit depths is reduced to two, and the insulation distance can be secured, and the jumper wires of different phases can be prevented from running over.

[0185] The motor of Example 4 is formed in this manner, and thus can ensure the mutual insulation of the multiple crossover wires 42, similarly to the motor 5 of Example 1 described above. Also, in the motor of Example 4, the multiple slits 74 are formed from two types of slits, that is, multiple slits with a first depth d1 and multiple slits with a second depth d2, and therefore the height in the axial direction of the outer peripheral wall portion 72 can be reduced. In the motor of Example 4, the height in the axial direction can be reduced due to the small height of the outer peripheral wall portion 72. In the compressor provided with the motor of Example 4, the height in the axial direction can be reduced due to the small height of the motor of Example 4.

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

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

[0188] 1: Compressor 5: Motor 6: Compression section 16: Rotation axis 21: Rotor 22: Stator 23: Stator core 24: Multiple windings 25: Lower insulator 31: York 32-1 to 32-12: Multiple stator core teeth 35: Outer wall 36-1 to 36-12: Multiple insulator teeth 38: Rotor core 39: Permanent magnet 41-1: 1st neutral point 41-2:Second neutral point 42: Multiple crossovers 43: Multiple neutral conductors 44: Multiple power lines 45-U1: 1st U phase series connection 45-U2: 2nd U phase series connection 45-V1: 1st V-phase series connection 45-V2: 2nd V phase series connection 45-W1: 1st W phase series connection 45-W2: 2nd W phase series connection 48-U1~48-U4: 4 U-phase slits 48-V1~48-V4: 4 V-phase slits 48-W1~48-W4: 4 W-phase slits 49: Multiple ribs 51: Lower insulator 52: Outer wall 54-U1~54-U4: 4 U-phase slits 54-V1~54-V4: 4 V-phase slits 54-W1~54-W4: 4 W-phase slits 55: Multiple ribs 60-U: U-phase connection wire 60-V: V-phase connection wire 60-W: W-phase connection wire 61: Lower insulator 62: Outer wall 64-U1~64-U6: 6 U-phase slits 64-V1~64-V6: 6 V-phase slits 64-W1~64-W6: 6 W-phase slits 71: Lower insulator 72: Outer wall 74-U1~74-U4: 4 U-phase slits 74-V1~74-V4: 4 V-phase slits 74-W1~74-W4: 4 W-phase slits 75: Multiple ribs

Claims

1. A rotor; a stator that generates a magnetic field that rotates the rotor about a rotation axis; The stator includes: a stator core including an annular yoke portion surrounding an outer periphery of the rotor, and a plurality of teeth (first teeth to twelfth teeth) protruding from an inner periphery of the yoke portion toward the rotor and arranged in a circumferential direction; a cylindrical insulator disposed at one end of the stator core in an axial direction parallel to the rotation axis; a plurality of windings formed by winding a 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 has three phases, each of which has: A first crossover wire that connects two of the four windings that are in phase with each other; a second jumper that connects two other windings of the four windings that are in phase with each other, a plurality of slits are formed in the insulator, including a plurality of draw-out side slits drawn from an end of the winding wire connected to the jumper wire, and a plurality of draw-in side slits drawn into a start of the winding wire connected to the jumper wire, each of the plurality of crossover wires connects two of the windings of the same phase to each other by passing through two slits, i.e., the draw-out side slit and the draw-in side slit, formed in the insulator; One of the U phase, V phase, and W phase is designated as the X phase, When the four X-phase windings are arranged in the circumferential direction as a first X-phase winding, a second X-phase winding, a third X-phase winding, and a fourth X-phase winding, a first X-phase crossover wire, which is one of the two X-phase crossover wires, connects the first X-phase winding and the second X-phase winding; a second X-phase crossover wire, which is the other of the two X-phase crossover wires, connects the third X-phase winding and the fourth X-phase winding; when the four slits of one phase are virtually rotated in a circumferential direction around the rotation axis, a shape of the four slits of the one phase coincides with a shape of the four slits of another phase, In said one phase, a depth of a draw-out side slit of the first crossover wire and a depth of a draw-in side slit of the first crossover wire are both a first depth, a depth of the draw-out side slit of the second crossover wire and a depth of the draw-in side slit of the second crossover wire are both a second depth that is shallower than the first depth; Motor.

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

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

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

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

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

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

8. A rotor, a stator that generates a magnetic field that rotates the rotor about a rotation axis; The stator includes: a stator core including an annular yoke portion surrounding an outer periphery of the rotor, and a plurality of teeth (first teeth to twelfth teeth) protruding from an inner periphery of the yoke portion toward the rotor and arranged in a circumferential direction; a cylindrical insulator disposed at one end of the stator core in an axial direction parallel to the rotation axis; a plurality of windings formed by winding a 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 has three phases, each of which has: A first crossover wire that connects two of the four windings that are in phase with each other; a second jumper that connects two other windings of the four windings that are in phase with each other, a plurality of slits are formed in the insulator, including a plurality of draw-out side slits drawn from an end of the winding wire connected to the jumper wire, and a plurality of draw-in side slits drawn into a start of the winding wire connected to the jumper wire, each of the plurality of crossover wires connects two of the windings of the same phase to each other by passing through two slits, i.e., the draw-out side slit and the draw-in side slit, formed in the insulator; One of the U phase, V phase, and W phase is designated as the X phase, When the four X-phase windings are arranged in the circumferential direction as a first X-phase winding, a second X-phase winding, a third X-phase winding, and a fourth X-phase winding, a first X-phase crossover wire, which is one of the two X-phase crossover wires, connects the first X-phase winding and the second X-phase winding; a second X-phase crossover wire, which is the other of the two X-phase crossover wires, connects the third X-phase winding and the fourth X-phase winding; when the four slits of one phase are virtually rotated in a circumferential direction around the rotation axis, a shape of the four slits of the one phase coincides with a shape of the four slits of another phase, in each of the three phases, of four slits, i.e., the outlet side slit of the first crossover wire, the inlet side slit of the first crossover wire, the outlet side slit of the second crossover wire, and the inlet side slit of the second crossover wire, the depths of two slits are all a first depth, and the depths of the remaining two slits are all a second depth that is shallower than the first depth, a connection wire is drawn from the second X-phase winding, connected to the X-phase power line, and drawn to an outer circumferential side of the insulator through the slits, and 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; Motor.

9. A plurality of ribs are formed on the outer peripheral surface of the insulator, The rib restricts the axial movement of the crossover wire.

9. The motor according to claim 8.

10. A rotor, a stator that generates a magnetic field that rotates the rotor about a rotation axis; The stator includes: a stator core including an annular yoke portion surrounding an outer periphery of the rotor, and a plurality of teeth (first teeth to twelfth teeth) protruding from an inner periphery of the yoke portion toward the rotor and arranged in a circumferential direction; a cylindrical insulator disposed at one end of the stator core in an axial direction parallel to the rotation axis; a plurality of windings formed by winding a 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 has three phases, each of which has: A first crossover wire that connects two of the four windings that are in phase with each other; a second jumper that connects two other windings of the four windings that are in phase with each other, a plurality of slits are formed in the insulator, including a plurality of draw-out side slits drawn from an end of the winding wire connected to the jumper wire, and a plurality of draw-in side slits drawn into a start of the winding wire connected to the jumper wire, each of the plurality of crossover wires connects two of the windings of the same phase to each other by passing through two slits, i.e., the draw-out side slit and the draw-in side slit, formed in the insulator; In each of the three phases, among four slits, namely, the draw-out side slit of the first crossover line, the draw-out side slit of the first crossover line, the draw-out side slit of the second crossover line, and the draw-in side slit of the second crossover line, at least two slits have the same depth, One of the U phase, V phase, and W phase is designated as the X phase, When the four X-phase windings are arranged in the circumferential direction as a first X-phase winding, a second X-phase winding, a third X-phase winding, and a fourth X-phase winding, a first X-phase crossover wire, which is one of the two X-phase crossover wires, connects the first X-phase winding and the third X-phase winding; a second X-phase crossover wire, which is the other of the two X-phase crossover wires, connects the second X-phase winding and the fourth X-phase winding. Motor.

11. When the four slits of one phase are virtually rotated by a predetermined angle in a circumferential direction around the rotation axis, a shape of the four slits of the one phase coincides with a shape of the four slits of another phase. The motor according to claim 10.

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

12. The motor according to claim 11.

13. In said one phase, a depth of a draw-side slit of the first crossover wire is a first depth, a depth of a lead-in side slit of the first crossover wire and a depth of a lead-out side slit of the second crossover wire are both a second depth that is shallower than the first depth, A depth of the inlet side slit of the second crossover wire is a third depth that is shallower than the second depth.

13. The motor according to claim 12.

14. A plurality of ribs are formed on the outer circumferential surface of the insulator, The rib restricts the axial movement of the crossover wire. The motor according to claim 10.

15. A motor according to any one of claims 1 to 14; a compression section that compresses a refrigerant by rotation of the rotor; a housing having an enclosed space formed therein in which the motor and the compression unit are housed; Compressor.

Images