JP7729161B2 - Motor, compressor, and motor manufacturing method - Google Patents

Description

The technology disclosed herein relates to a motor, a compressor, and a motor manufacturing method.

A hermetically sealed compressor is known, in which a motor and a compression unit driven by rotational power generated by the motor are housed inside a housing. The motor includes a rotor with a fixed permanent magnet, an annular yoke surrounding the rotor's outer periphery, multiple teeth formed integrally with the yoke and projecting from the yoke toward the rotor, and multiple conductors. The multiple conductors include multiple windings (coils) wound around the multiple teeth, respectively, and connecting wires connected to the multiple windings (coils) (Patent Document 1). The connecting wires are attached to the yoke before the windings (coils) are wound around the teeth. Being pinched between the windings and the yoke can result in load application and damage (e.g., breakage). To address this issue, a motor has been developed in which a groove is formed on the surface of the yoke facing the windings, and a slot film separating the yoke and the windings is machined to follow the groove in the yoke (Patent Document 2). In this motor, the connecting wire for the conductor is passed through the groove, and then the wire is wound around the teeth to form a winding (coil). This prevents the connecting wire from being pinched and compressed between the winding and the yoke, reducing the load on the connecting wire.

Japanese Patent Application Laid-Open No. 2018-198518 JP 2013-138585 A

However, the manufacturing process for the motor described in Patent Document 2 requires a step of placing the connection wires connected to the windings inside the grooves before the conductor wires are wound around the teeth to form the windings (coils). In the case of the motor described above, which has narrow grooves, the step of placing the connection wires in the grooves is time-consuming, resulting in increased manufacturing costs. The motor described above also requires the slot film to be processed to fit the grooves, resulting in increased manufacturing costs.

The disclosed technology was developed in light of these issues, and aims to provide a motor, compressor, and motor manufacturing method that simplifies manufacturing while reducing the load on the conductors.

A motor according to one aspect of the present disclosure includes a rotor and a stator. The stator includes an annular yoke surrounding the outer periphery of the rotor, teeth formed integrally with the yoke and projecting from the yoke toward the rotor, windings wound around the teeth, connection wires connected to the windings, and a film separating the yoke from the windings and separating the yoke from the connection wire. The yoke has a recessed groove recessed from the inner circumferential surface of the yoke facing the winding toward the outer diameter, so as to form a space between the windings and the yoke for arranging the connection wire. The space is sized to allow the connection wire to move circumferentially within the space , and the connection wire is pressed against the winding by the elastic force of the film .

The disclosed motor, compressor, and motor manufacturing method can simplify manufacturing while reducing the load on the conductors.

FIG. 1 is a vertical cross-sectional view showing a compressor provided with a motor according to a first embodiment. FIG. 2 is an exploded perspective view showing the stator of the compressor of the first embodiment. FIG. 3 is a top view showing the stator core of the compressor of the first embodiment. FIG. 4 is an enlarged top view showing a part of the stator core. FIG. 5 is a bottom view showing the insulator on the non-lead side. FIG. 6 is an enlarged bottom view showing a part of the insulator on the non-lead side. FIG. 7 is a development view showing the stator. FIG. 8 is a top view showing a first slot film of the plurality of slot films. FIG. 9 is a bottom view showing the side of the stator opposite the lead. FIG. 10 is a top view showing the lead side of the stator. FIG. 11 is an enlarged cross-sectional view showing a part of the yoke portion and the first connecting wire of the motor of the first embodiment. FIG. 12 is an enlarged cross-sectional view showing a part of the yoke portion and the first connecting wire of the motor of Comparative Example 1. FIG. 13 is an enlarged cross-sectional view showing a part of the yoke portion and the first connecting wire of the motor of Comparative Example 2. FIG. 14 is an enlarged cross-sectional view showing a part of the yoke portion and the first connecting wire of the motor of the second embodiment.

The motor, compressor, and motor manufacturing method according to the embodiments disclosed herein will be described below 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, identical components will be assigned the same reference numerals, and duplicate explanations will be omitted.

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

The housing 2 is equipped with a U-phase power terminal 8U, a V-phase power terminal 8V, and a W-phase power terminal 8W. The U-phase power terminal 8U is made of a conductor. The U-phase power terminal 8U penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. The V-phase power terminal 8V is made of a conductor. The V-phase power terminal 8V penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. The W-phase power terminal 8W is made of a conductor. The W-phase power terminal 8W penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. 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 so that they are not electrically connected to each other or to the housing 2.

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

The motor 5 is located at the top of the internal space 7. The motor 5 includes a rotor 21 and a stator 22. The rotor 21 is formed in a generally cylindrical shape. The rotor 21 is fixed to the shaft 3 and supported by the housing 2 so as to be rotatable around the rotation axis 16. The rotor 21 includes a plurality of permanent magnets (not shown). The multiple permanent magnets are embedded inside the rotor 21 and fixed to it. The stator 22 is formed in a generally cylindrical shape. The stator 22 is disposed so as to surround the outer periphery of the rotor 21 and is fixed to the housing 2.

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

Figure 2 is an exploded perspective view showing the stator 22 of the compressor 1 of the first embodiment. The stator 22 includes a stator core 23, a non-lead side insulator 24, a lead side insulator 25, and multiple slot films 261-269 (films). The stator core 23 is formed in a cylindrical shape by stacking multiple electromagnetic steel plates made of soft magnetic material, such as silicon steel plates, in the height direction of the cylindrical body. Portions of the stator core 23 corresponding to the two bottom surfaces of the cylindrical body are formed with a lower end surface 27 and an upper end surface 28, respectively. The non-lead side insulator 24 is formed from an insulator. The non-lead side insulator 24 is disposed below the stator core 23 and is in contact with the lower end surface 27 of the stator core 23. The lead side insulator 25 is also formed from an insulator. The lead side insulator 25 is disposed above the stator core 23 and is in contact with the upper end surface 28 of the stator core 23.

Figure 3 is a top view showing the stator core 23 of the compressor 1 of the first embodiment. The stator core 23 includes a yoke portion 31 and multiple teeth 321-329. The yoke portion 31 is formed in a generally cylindrical shape and is positioned so that its central axis overlaps the rotational axis 16 of the rotor 21. The yoke portion 31 has an inner circumferential surface 33. The inner circumferential surface 33 is aligned along the cylindrical surface and faces the rotational axis 16. The yoke portion 31 also forms a portion of the upper end surface 28 of the stator core 23, and, although not shown in Figure 3, forms a portion of the lower end surface 27 of the stator core 23.

Of the multiple tooth portions 321-329, the first tooth portion 321 is formed in a generally rectangular prism shape. The first tooth portion 321 is formed integrally with the yoke portion 31, with one end of the first tooth portion 321 adjacent to the inner circumferential surface 33 of the yoke portion 31. That is, the first tooth portion 321 is formed so as to protrude from the inner circumferential surface 33 of the yoke portion 31 toward the rotating shaft 16. A portion of the upper end surface 28 of the stator core 23 is formed on the first tooth portion 321, and, although not shown in FIG. 3, a portion of the lower end surface 27 of the stator core 23 is also formed on the first tooth portion 321. The other tooth portions of the multiple tooth portions 321-329 that are different from the first tooth portion 321 are formed so as to protrude from the inner circumferential surface 33 of the yoke portion 31 toward the rotating shaft 16, similar to the first tooth portion 321. The multiple teeth 321-329 are arranged inside the yoke 31 at equal intervals in the circumferential direction and are formed integrally with the yoke 31.

A plurality of slots 341 to 349 are formed in the stator core 23. Each of the slots 341 to 349 is a space sandwiched between the yoke portion 31 and two adjacent teeth of the plurality of teeth 321 to 329. That is, the first slot 341 of the plurality of slots 341 to 349 is formed between the first tooth 321 and the second tooth 322, which are adjacent teeth of the plurality of teeth 321 to 329. The second slot 342 is formed between the second tooth 322 and the third tooth 323. The third slot 343 is formed between the third tooth 323 and the fourth tooth 324. The fourth slot 344 is formed between the fourth tooth 324 and the fifth tooth 325. The fifth slot 345 is formed between the fifth tooth 325 and the sixth tooth 326. The sixth slot 346 is formed between the sixth tooth portion 326 and the seventh tooth portion 327. The seventh slot 347 is formed between the seventh tooth portion 327 and the eighth tooth portion 328. The eighth slot 348 is formed between the eighth tooth portion 328 and the ninth tooth portion 329. The ninth slot 349 is formed between the ninth tooth portion 329 and the first tooth portion 321.

Figure 4 is an enlarged top view showing a portion of the stator core 23. Multiple grooves 35, 36 are formed in the yoke portion 31 of the stator core 23. The multiple grooves 35, 36 are formed from multiple left grooves 351-359 and multiple right grooves 361-369. The multiple left grooves 351-359 correspond to the multiple teeth 321-329. Of the multiple left grooves 351-359, the first left groove 351 corresponding to the first tooth 321 is formed near the first tooth 321 on the inner circumferential surface 33 of the yoke portion 31, and is formed on the counterclockwise side of the first tooth 321 on the inner circumferential surface 33. In other words, the first left groove 351 is formed in the area of the inner circumferential surface 33 facing the first slot 341. The first left groove 351 is formed so as to be recessed from the inner circumferential surface 33 along a straight line parallel to the rotation axis 16. The other left grooves of the multiple left grooves 351-359 that are different from the first left groove 351 are also formed in the same manner as the first left groove 351. For example, the second left groove 352 of the multiple left grooves 351-359 is formed on the counterclockwise side of the second teeth portion 322 of the inner circumferential surface 33, and is formed so as to be recessed from the inner circumferential surface 33 along a straight line parallel to the rotation axis 16.

The multiple right-side grooves 361-369 correspond to the multiple tooth portions 321-329. Of the multiple right-side grooves 361-369, the first right-side groove 361 corresponding to the first tooth portion 321 is formed near the first tooth portion 321 on the inner circumferential surface 33 of the yoke portion 31, and is formed on the clockwise side of the inner circumferential surface 33 from the first tooth portion 321. In other words, the first right-side groove 361 is formed in an area of the inner circumferential surface 33 facing the ninth slot 349. The first right-side groove 361 is formed so as to be recessed from the inner circumferential surface 33 along a straight line parallel to the rotation axis 16. The other right-side grooves different from the first right-side groove 361 among the multiple right-side grooves 361-369 are also formed in the same manner as the first right-side groove 361. For example, of the multiple right-side grooves 361-369, the second right-side groove 362 is formed on the clockwise side of the second teeth portion 322 of the inner circumferential surface 33, and is recessed from the inner circumferential surface 33 along a straight line parallel to the rotation axis 16.

Figure 5 is a bottom view showing the non-lead side insulator 24. The non-lead side insulator 24 comprises an outer peripheral wall portion 41 and multiple winding body portions 421-429. The outer peripheral wall portion 41 is formed in a generally cylindrical shape. An inner peripheral surface 43 is formed on the outer peripheral wall portion 41. The inner peripheral surface 43 follows the cylindrical surface and faces the rotation axis 16.

The multiple winding drums 421-429 correspond to the multiple teeth 321-329 of the stator core 23. Of the multiple winding drums 421-429, the first winding drum 421 is formed in a band shape. One end of the first winding drum 421 is adjacent to the inner circumferential surface 43 of the outer circumferential wall 41, and the first winding drum 421 is formed integrally with the outer circumferential wall 41 so as to protrude from the inner circumferential surface 43 of the outer circumferential wall 41 toward the rotating shaft 16. The other winding drums of the multiple winding drums 421-429 that are different from the first winding drum 421 are formed similarly to the first winding drum 421 and are formed integrally with the outer circumferential wall 41 so as to protrude from the inner circumferential surface 43 of the outer circumferential wall 41 toward the rotating shaft 16. The multiple winding drums 421-429 are arranged inside the outer circumferential wall 41 so as to be evenly spaced circumferentially.

The non-lead side insulator 24 further includes a mounting surface 44. The mounting surface 44 is formed flat along a plane perpendicular to the rotation axis 16. A portion of the mounting surface 44 is formed on the outer peripheral wall 41, and other portions of the mounting surface 44 are formed on the multiple winding drum portions 421-429. The non-lead side insulator 24 is attached to the stator core 23 so that the mounting surface 44 contacts the lower end surface 27 of the stator core 23 and so that the inner peripheral surface 33 of the yoke portion 31 of the stator core 23 is aligned with the cylindrical surface along which the inner peripheral surface 43 of the outer peripheral wall 41 is aligned. The non-lead side insulator 24 is further attached to the stator core 23 so that the multiple winding drum portions 421-429 respectively cover the lower end surfaces of the multiple tooth portions 321-329 of the stator core 23.

Figure 6 is an enlarged bottom view showing a portion of the non-lead side insulator 24. A plurality of recesses 46 are further formed in the outer peripheral wall portion 41. The recesses 46 are formed at positions circumferentially corresponding to the recessed grooves 35, 36. Each of the recesses 46 is formed in a region where the mounting surface 44 and the inner peripheral surface 43 are adjacent, and is recessed from both the mounting surface 44 and the inner peripheral surface 43. The non-lead side insulator 24 is attached to the stator core 23 so that the recesses 46 are connected to the recessed grooves 35, 36, respectively.

As shown in Figure 2, multiple slits 47 are formed in the outer peripheral wall 41. Each of the multiple slits 47 is formed along a straight line that is parallel to the straight line along the rotation axis 16, and is connected to the end of the outer peripheral wall 41 opposite the end on which the mounting surface 44 is formed.

In Example 1, the lead-side insulator 25 is formed in the same shape as the non-lead-side insulator 24. That is, the lead-side insulator 25 has an outer peripheral wall portion 41 and multiple winding body portions 421-429, and is formed with an inner peripheral surface 43, a mounting surface 44, and multiple recesses 46. The lead-side insulator 25 is attached to the stator core 23 so that the mounting surface 44 contacts the upper end surface 28 of the stator core 23 and so that the inner peripheral surface 33 of the yoke portion 31 of the stator core 23 is aligned with the cylindrical surface along which the inner peripheral surface 43 of the outer peripheral wall portion 41 is aligned. The lead-side insulator 25 is further attached to the stator core 23 so that the multiple winding body portions 421-429 respectively cover the upper end surfaces of the multiple tooth portions 321-329 of the stator core 23. The lead side insulator 25 and the non-lead side insulator 24 are formed to the same shape, so they can be manufactured without distinction and can be attached to the stator core 23 without distinction. Note that the lead side insulator 25 does not have to have the same shape as the non-lead side insulator 24.

Figure 7 is an exploded view showing the stator 22. The stator 22 includes a plurality of conductors. Each of the plurality of conductors is, for example, an enameled wire, which is a copper wire coated with enamel. The plurality of conductors includes a first winding 521, a second winding 522, a third winding 523, a fourth winding 524, a fifth winding 525, a sixth winding 526, a seventh winding 527, an eighth winding 528, and a ninth winding 529. The first winding 521 is wound around the first tooth portion 321 of the stator core 23. The second winding 522 is wound around the second tooth portion 322. The third winding 523 is wound around the third tooth portion 323. The fourth winding 524 is wound around the fourth tooth portion 324. The fifth winding 525 is wound around the fifth tooth portion 325. The sixth winding 526 is wound around the sixth tooth 326. The seventh winding 527 is wound around the seventh tooth 327. The eighth winding 528 is wound around the eighth tooth 328. The ninth winding 529 is wound around the ninth tooth 329.

The multiple conductors further include a first connection line 531, a second connection line 532, a third connection line 533, a fourth connection line 534, a fifth connection line 535, a sixth connection line 536, a seventh connection line 537, an eighth connection line 538, and a ninth connection line 539. One end of the first connection line 531 is connected to one end of the first winding 521. A portion of the first connection line 531 is disposed within the first left-hand groove 351 of the stator core 23, and another portion of the first connection line 531 is disposed within one recess 461 of the multiple recesses 46 of the lead-side insulator 25 that is continuous with the first left-hand groove 351.

One end of the second connection wire 532 is connected to one end of the second winding 522. A portion of the second connection wire 532 is disposed within the second right-side groove 362 of the stator core 23, and another portion of the second connection wire 532 is disposed within one of the recesses 46 of the lead-side insulator 25 that is connected to the second right-side groove 362. One end of the third connection wire 533 is connected to one end of the third winding 523. A portion of the third connection wire 533 is disposed within the third left-side groove 353 of the stator core 23, and another portion of the third connection wire 533 is disposed within one of the recesses 46 of the lead-side insulator 25 that is connected to the third left-side groove 353.

One end of the fourth connection wire 534 is connected to one end of the fourth winding 524. A portion of the fourth connection wire 534 is disposed within the fourth right-side groove 364 of the stator core 23, and another portion of the fourth connection wire 534 is disposed within one of the recesses 46 of the non-lead-side insulator 24 that is connected to the fourth right-side groove 364. One end of the fifth connection wire 535 is connected to one end of the fifth winding 525. A portion of the fifth connection wire 535 is disposed within the fifth left-side groove 355 of the stator core 23, and another portion of the fifth connection wire 535 is disposed within one of the recesses 46 of the non-lead-side insulator 25 that is connected to the fifth left-side groove 355.

One end of the sixth connecting wire 536 is connected to one end of the sixth winding 526. A portion of the sixth connecting wire 536 is disposed within the sixth right-side groove 366 of the stator core 23, and another portion of the sixth connecting wire 536 is disposed within one of the recesses 46 of the non-lead-side insulator 24 that is connected to the sixth right-side groove 366. One end of the seventh connecting wire 537 is connected to one end of the seventh winding 527. A portion of the seventh connecting wire 537 is disposed within the seventh right-side groove 367 of the stator core 23, and another portion of the seventh connecting wire 537 is disposed within one of the recesses 46 of the non-lead-side insulator 25 that is connected to the seventh right-side groove 367.

One end of the eighth connecting wire 538 is connected to one end of the eighth winding 528. A portion of the eighth connecting wire 538 is disposed within the eighth right-side groove 368 of the stator core 23, and another portion of the eighth connecting wire 538 is disposed within one of the recesses 46 of the non-lead side insulator 24 that is connected to the eighth right-side groove 368. One end of the ninth connecting wire 539 is connected to one end of the ninth winding 529. A portion of the ninth connecting wire 539 is disposed within the ninth right-side groove 369 of the stator core 23, and another portion of the ninth connecting wire 539 is disposed within one of the recesses 46 of the non-lead side insulator 24 that is connected to the ninth right-side groove 369.

The multiple conductors further include a first power supply conductor 541 and a first neutral conductor 551. One end of the first power supply conductor 541 is connected to the U-phase power supply terminal 8U. The other end of the first power supply conductor 541 is connected to the other end of the first connecting conductor 531 opposite the end connected to the first winding 521. One end of the first neutral conductor 551 is connected to the other end of the first winding 521 opposite the end connected to the first connecting conductor 531. The other end of the first neutral conductor 551 is electrically connected to the neutral point. In other words, the first power supply conductor 541, the first connecting conductor 531, the first winding 521, and the first neutral conductor 551 form a single conductor that electrically connects the U-phase power supply terminal 8U and the neutral point.

The stator 22 further includes a second crossover wire 562, a second power supply wire 542, and a second neutral wire 552. The second crossover wire 562 is disposed on the outer peripheral side of the outer peripheral wall portion 41 of the non-lead side insulator 24. The other end of the second winding wire 522, opposite the end connected to the second connecting wire 532, passes through one slit 482 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the second crossover wire 562. One end of the second power supply wire 542 passes through one slit 472 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the second crossover wire 562. The other end of the second power supply wire 542 is connected to the V-phase power terminal 8V. One end of the second neutral wire 552 is connected to the other end of the second connecting wire 532, opposite the end connected to the second winding wire 522. The other end of the second neutral conductor 552 is electrically connected to the neutral point. In other words, the second power supply conductor 542, the second jumper conductor 562, the second winding 522, the second connecting conductor 532, and the second neutral conductor 552 are formed by a single conductor that electrically connects the V-phase power supply terminal 8V and the neutral point.

The multiple conductors further include a third power supply conductor 543 and a third neutral conductor 553. One end of the third power supply conductor 543 is connected to the W-phase power supply terminal 8W. The other end of the third power supply conductor 543 is connected to the other end of the third connecting conductor 533 opposite the end connected to the third winding 523. One end of the third neutral conductor 553 is connected to the other end of the third winding 523 opposite the end connected to the third connecting conductor 533. The other end of the third neutral conductor 553 is electrically connected to the neutral point. In other words, the third power supply conductor 543, the third connecting conductor 533, the third winding 523, and the third neutral conductor 553 are formed by a single conductor that electrically connects the U-phase power supply terminal 8U and the neutral point.

The multiple conductors further include a fourth crossover 564, a fourth power supply conductor 544, and a fourth neutral conductor 554. The fourth crossover 564 is arranged on the outer peripheral side of the outer wall portion 41 of the non-lead side insulator 24. The other end of the fourth connecting conductor 534, opposite the end connected to the fourth winding 524, passes through one slit 484 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the fourth crossover 564. One end of the fourth power supply conductor 544 passes through one slit 474 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the fourth crossover 564. The other end of the fourth power supply conductor 544 is connected to the U-phase power terminal 8U. One end of the fourth neutral conductor 554 is connected to the other end of the fourth winding 524, opposite the end connected to the fourth connecting conductor 534. The other end of the fourth neutral conductor 554 is electrically connected to the neutral point. In other words, the fourth power supply conductor 544, the fourth jumper conductor 564, the fourth connecting conductor 534, the fourth winding 524, and the fourth neutral conductor 554 are formed by a single conductor that electrically connects the U-phase power supply terminal 8U and the neutral point.

The multiple conductors further include a fifth power supply conductor 545 and a fifth neutral conductor 555. One end of the fifth power supply conductor 545 is connected to the V-phase power supply terminal 8V and is connected to the end of the second power supply conductor 542 that is connected to the V-phase power supply terminal 8V. The other end of the fifth power supply conductor 545 is connected to the other end of the fifth connecting conductor 535 that is opposite the one end that is connected to the fifth winding 525. One end of the fifth neutral conductor 555 is connected to the other end of the fifth winding 525 that is opposite the one end that is connected to the fifth connecting conductor 535. The other end of the fifth neutral conductor 555 is electrically connected to the neutral point. In other words, the fifth power supply conductor 545, the fifth winding 525, the fifth connecting conductor 535, and the fifth neutral conductor 555 form a single conductor that electrically connects the V-phase power supply terminal 8V and the neutral point. Furthermore, the second neutral conductor 552, the second connecting conductor 532, the second winding 522, the second power supply conductor 542, the fifth power supply conductor 545, the fifth winding 525, the fifth connecting conductor 535, and the fifth neutral conductor 555 are formed from a single conductor.

The multiple conductors further include a sixth crossover 566, a sixth power supply conductor 546, and a sixth neutral conductor 556. The sixth crossover 566 is arranged on the outer peripheral side of the outer wall portion 41 of the non-lead side insulator 24. The other end of the sixth connecting conductor 536, opposite the end connected to the sixth winding 526, passes through one slit 486 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the sixth crossover 566. One end of the sixth power supply conductor 546 passes through one slit 476 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the sixth crossover 566. The other end of the sixth power supply conductor 546 is connected to the W-phase power terminal 8W. One end of the sixth neutral conductor 556 is connected to the other end of the sixth winding 526, opposite the end connected to the sixth connecting conductor 536. The other end of the sixth neutral conductor 556 is electrically connected to the neutral point. In other words, the sixth power supply conductor 546, the sixth jumper conductor 566, the sixth connecting conductor 536, the sixth winding 526, and the sixth neutral conductor 556 are formed by a single conductor that electrically connects the W-phase power supply terminal 8W and the neutral point.

The multiple conductors further include a seventh crossover 567, a seventh power supply conductor 547, and a seventh neutral conductor 557. The seventh crossover 567 is arranged on the outer periphery of the outer wall portion 41 of the non-lead side insulator 24. The other end of the seventh winding 527, opposite the end connected to the seventh connection conductor 537, passes through one slit 487 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the seventh crossover 567. One end of the seventh power supply conductor 547 passes through one slit 477 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the seventh crossover 567. The other end of the seventh power supply conductor 547 is connected to the U-phase power terminal 8U and is connected to the end of the first power supply conductor 541 that is connected to the U-phase power supply terminal 8U. One end of the seventh neutral conductor 557 is connected to the other end of the seventh connecting conductor 537, opposite the end connected to the seventh winding 527. The other end of the seventh neutral conductor 557 is electrically connected to the neutral point. That is, the seventh power supply conductor 547, the seventh jumper conductor 567, the seventh winding 527, the seventh connecting conductor 537, and the seventh neutral conductor 557 form a single conductor that electrically connects the U-phase power supply terminal 8U and the neutral point. Furthermore, the seventh neutral conductor 557, the seventh connecting conductor 537, the seventh winding 527, the seventh jumper conductor 567, the seventh power supply conductor 547, the first power supply conductor 541, the first connecting conductor 531, the first winding 521, and the first neutral conductor 551 form a single conductor.

The multiple conductors further include an eighth jumper 568, an eighth power supply 548, and an eighth neutral 558. The eighth jumper 568 is arranged on the outer periphery of the outer wall portion 41 of the non-lead side insulator 24. The other end of the eighth connecting conductor 538, opposite the end connected to the eighth winding 528, passes through one slit 488 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the eighth jumper 568. One end of the eighth power supply conductor 548 passes through one slit 478 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the eighth jumper 568. The other end of the eighth power supply conductor 548 is connected to the V-phase power terminal 8V. One end of the eighth neutral conductor 558 is connected to the other end of the eighth winding 528, opposite the end connected to the eighth connecting conductor 538. The other end of the eighth neutral conductor 558 is electrically connected to the neutral point. In other words, the eighth power supply conductor 548, the eighth jumper conductor 568, the eighth connecting conductor 538, the eighth winding 528, and the eighth neutral conductor 558 are formed by a single conductor that electrically connects the V-phase power supply terminal 8V and the neutral point.

The multiple conductors further include a ninth crossover wire 569, a ninth power supply wire 549, and a ninth neutral wire 559. The ninth crossover wire 569 is disposed on the outer peripheral side of the outer wall portion 41 of the non-lead side insulator 24. The other end of the ninth winding 529, opposite the end connected to the ninth connection wire 539, passes through one slit 489 of the multiple slits 47 of the non-lead side insulator 24 and is connected to one end of the ninth crossover wire 569. One end of the ninth power supply wire 549 passes through one slit 479 of the multiple slits 47 of the non-lead side insulator 24 and is connected to the other end of the ninth crossover wire 569. The other end of the ninth power supply wire 549 is connected to the U-phase power supply terminal 8U and is connected to the end of the third power supply wire 543 that is connected to the U-phase power supply terminal 8U. One end of the ninth neutral conductor 559 is connected to the other end of the ninth connecting conductor 539, opposite the end connected to the ninth winding 529. The other end of the ninth neutral conductor 559 is electrically connected to the neutral point. That is, the ninth power supply conductor 549, the ninth jumper 569, the ninth winding 529, the ninth connecting conductor 539, and the ninth neutral conductor 559 are formed by a single conductor that electrically connects the W-phase power supply terminal 8W and the neutral point. Furthermore, the ninth neutral conductor 559, the ninth connecting conductor 539, the ninth winding 529, the ninth jumper 569, the ninth power supply conductor 549, the third power supply conductor 543, the third connecting conductor 533, the third winding 523, and the third neutral conductor 553 are formed by a single conductor.

Figure 8 is a top view showing the first slot film 261 of the multiple slot films 261-269. The first slot film 261 is formed from an insulating material such as polyethylene terephthalate (PET) and is formed in a curved sheet shape. The first slot film 261 has a right tooth-facing portion 61, a left tooth-facing portion 62, and a yoke-facing portion 63. The yoke-facing portion 63 is formed between the right tooth-facing portion 61 and the left tooth-facing portion 62. The other slot films different from the first slot film 261 among the multiple slot films 261-269 are also formed in the same manner as the first slot film 261.

Figure 9 is a bottom view of the stator 22. The multiple slot films 261-269 are arranged inside the multiple slots 341-349, respectively. The yoke-facing portion 63 of the first slot film 261 is aligned with the inner circumferential surface 33 of the yoke portion 31. Although not shown in Figure 9, the right-side tooth-facing portion 61 of the first slot film 261 is aligned with the side surface of the first tooth portion 321, and the left-side tooth-facing portion 62 is aligned with the side surface of the second tooth portion 322. Other slot films of the multiple slot films 261-269 that are different from the first slot film 261 are also arranged inside one of the multiple slots 341-349, similar to the first slot film 261.

The multiple windings 521-529 are wound around the multiple slot films 261-269 together with the multiple tooth portions 321-329. By winding the multiple windings 521-529 around the multiple tooth portions 321-329 in this manner, the multiple slot films 261-269 separate the multiple tooth portions 321-329 from the multiple windings 521-529, and also separate the yoke portion 31 from the multiple windings 521-529.

The multiple windings 521-529 are wound around the multiple winding body portions 421-429 of the non-lead side insulator 24 together with the multiple tooth portions 321-329. By winding the multiple windings 521-529 around the multiple tooth portions 321-329 in this manner, the multiple winding body portions 421-429 of the non-lead side insulator 24 separate the multiple tooth portions 321-329 from the multiple windings 521-529.

Figure 10 is a top view showing the stator 22. The multiple windings 521-529 are wound around the multiple winding body portions 421-429 of the lead-side insulator 25 together with the multiple teeth portions 321-329. The multiple winding body portions 421-429 of the lead-side insulator 25 separate the multiple teeth portions 321-329 from the multiple windings 521-529 by winding the multiple windings 521-529 around the multiple teeth portions 321-329 in this manner. The non-lead-side insulator 24, the lead-side insulator 25, and the multiple slot films 261-269 prevent the stator core 23 from making electrical contact with the multiple windings 521-529 by winding the multiple windings 521-529 around the multiple teeth portions 321-329 in this manner. In other words, the stator core 23 and the multiple windings 521-529 are insulated from each other by being separated by the non-lead side insulator 24, the lead side insulator 25, and the multiple slot films 261-269.

Figure 11 is an enlarged cross-sectional view, viewed from the rotation axis direction, showing the positional relationship between a portion of the yoke portion 131 of the motor 5 of Example 1 and the first connecting wire 531. As described above, the yoke portion 31 of the motor 5 has a first left-hand groove 351 recessed radially outward from the inner circumferential surface 33 facing the first winding 521. A portion of the first connecting wire 531 is disposed within the first left-hand groove 351. The formation of the first left-hand groove 351 in the yoke portion 31 forms a groove space 71 surrounded by the inner surface of the first left-hand groove 351 of the yoke portion 31 and the first winding 521. The groove space 71 is formed large enough to allow the first connecting wire 531 to move circumferentially within the groove space 71. The depth of the first left-hand groove 351 need only be greater than the wire diameter of the first connecting wire 531. In Example 1, the depth is approximately twice the length of the first connecting wire 531. The circumferential width of the first left-hand groove 351 only needs to be greater than twice the length of the wire diameter of the first connecting wire 531, and in Example 1, it is formed to be approximately five times the wire diameter of the first connecting wire 531. Note that the depth of the first left-hand groove 351 refers to how far the inner surface of the first left-hand groove 351 is positioned toward the outer diameter of an imaginary circle whose center is the rotation shaft 16 and whose radius is the distance to the base positions of the teeth 321 to 329 connected to the yoke portion 31. Furthermore, as an expression indicating the size of the groove space 71, "being large enough to allow the first connecting wire 531 to move circumferentially within the groove space 71" refers to a size that allows two or more connecting wires of the same thickness as the first connecting wire 531 to be arranged side by side in the circumferential direction in the groove space 71 formed by the inner surface of the first left-hand groove 351 and the outer surface of the first winding 521. The first left groove 351 is further formed so that the depth of the first left groove 351 decreases toward the circumferential edge of the first left groove 351. A portion of the first connection line 531 is disposed in this groove space 71.

In Example 1, the groove space 71 includes a film outer peripheral space 72 (second space) and a film inner peripheral space 73 (first space). Here, the portion of the yoke-facing portion 63 of the first slot film 261 shown in FIG. 8 that is located in the groove space 71 shown in FIG. 11 is referred to as the groove arrangement portion 64. As shown in FIG. 11, the groove space 71 is divided into a film outer peripheral space 72 and a film inner peripheral space 73 by the groove arrangement portion 64 of the first slot film 261. That is, the groove space 71 is formed on the outer peripheral side of the groove arrangement portion 64 of the yoke-facing portion 63 of the first slot film, and the film inner peripheral space 73 (first space) is formed on the inner peripheral side of the groove arrangement portion 64 of the yoke-facing portion 63 of the first slot film. The film outer peripheral space 72 is located on the outer peripheral side of the yoke-facing portion 63 of the first slot film 261 and is surrounded by the groove-arranged portion 64 of the yoke-facing portion 63 of the first slot film 261 and the inner surface of the first left groove 351 of the yoke portion 31. The film inner peripheral space 73 is located on the inner peripheral side of the yoke-facing portion 63 of the first slot film 261 and is surrounded by the groove-arranged portion 64 of the yoke-facing portion 63 of the first slot film 261 and the first winding 521. A portion of the first connecting wire 531 is located in the film inner peripheral space 73, and is therefore insulated from the stator core 23.

Here, we will explain the mechanism by which the groove space 71 is divided into a film outer peripheral side space 72 (second space) and a film inner peripheral side space 73 (first space) when a part of the first connection line 531 is in the groove space 71.
When a portion of the first connecting wire 531 is positioned on the inner periphery of the yoke-facing portion 63 of the first slot film 261, the groove-positioned portion 64 of the yoke-facing portion 63 of the first slot film 261 is pushed radially outward by the first connecting wire 531 positioned on the inner periphery. At this time, the connecting wire contact portion 641 of the groove-positioned portion 64 of the first slot film 261, which is the portion that directly contacts the first connecting wire 531, bends and extends radially outward of the motor 5 within the groove space 71, along the outer periphery of the first connecting wire 531. On the other hand, because the first slot film 261 itself is made of an elastic material, the connecting line non-contact areas 642 of the groove arrangement portion 64, which are continuous on both sides of the connecting line contact area 641, are stretched by an elastic force (restoring force) that acts to return the stretched first slot film 261 to its original length, so as to linearly connect the starting point 351a of the first left-side groove 351 and the connecting line contact area 641. This divides the groove space 71 into a film outer peripheral space 72 (second space) and a film inner peripheral space 73 (first space).

As a portion of the first connecting wire 531 is positioned in the film inner peripheral space 73, the yoke-facing portion 63 of the first slot film 261 is pressed radially outward by contact with the first connecting wire 531, elastically deforming in the groove space 71 so as to bend radially outward at a position circumferentially corresponding to the first left-hand groove 351. Therefore, the portion of the first connecting wire 531 positioned in the film inner peripheral space 73 receives a radially inward force from the connecting wire contact point 641 due to an elastic force (restoring force) acting on the groove-positioned portion 64 of the first slot film 261, and is pressed against the first winding 521. As a result, the portion of the first connecting wire 531 positioned in the groove space 71 is fixed by the groove-positioned portion 64, being pressed against the first winding 521, thereby restricting movement of the portion of the first connecting wire 531 within the groove space 71. Because the first connection line 531 of the motor 5 does not move within the first left-hand groove 351, the first crossover line 561 connected to the first connection line 531 can be prevented from loosening.

In the motor 5, the first left-hand groove 351 is large enough to allow the first connection wire 531 to move within it, preventing the first connection wire 531 from being pinched between the yoke portion 31 and the first winding 521, thereby reducing the load on the first connection wire 531. Furthermore, in the motor 5, a recess 461 through which the first connection wire 531 passes is formed in the lead-side insulator 25, preventing the first connection wire 531 from being pinched between the outer wall portion 41 of the lead-side insulator 25 and the first winding 521, thereby reducing the load on the first connection wire 531. By reducing the load on the first connection wire 531, the motor 5 can prevent damage to the first connection wire 531. As with the first connection line 531, the motor 5 can reduce the load applied to the multiple connection lines 531-539, preventing damage to the multiple connection lines 531-539.

In the motor 5 of Example 1, even if the portion of the first connection wire 531 located inside the first left-side groove 351 is positioned within the groove space 71 at a position indicated by the dotted line in FIG. 11 , which is circumferentially shifted from the position indicated by the solid line, the groove-positioned portion 64 of the first slot film 261 bends (expands) radially outward to match the circumferential position of the first connection wire 531, thereby forming a film inner-periphery-side space 73 and a film outer-periphery-side space 72 of appropriate sizes according to the position of the portion of the first connection wire 531. Furthermore, within the groove space 71, a film outer-periphery-side space 72 partitioned by the first slot film 261 is formed on the outer side of the film inner-periphery-side space 73 in which the first connection wire 531 is located. This prevents the first connection wire 531 from being sandwiched between the yoke portion 31 and the first winding 521, thereby reducing the load on the first connection wire 531. Meanwhile, the elastically deformed first slot film 261 has a bent (bulged) portion (connection wire contact portion 641) on the outer diameter side of the groove arrangement portion 64, which generates an elastic force (restoring force) that causes the portion to return to its original shape, pressing the first connection wire 531 against the first winding 521. This allows the motor 5 of Example 1 to restrict the first connection wire 531 from moving within the groove space 71 (first left groove 351).

Of the multiple grooves 35, 36, the other grooves different from the first left-side groove 351 also become shallower as they approach the edge, similar to the first left-side groove 351. As a result, even if the circumferential width of each of the multiple grooves 35, 36 is large, the motor 5 can prevent the magnetic flux passing through the yoke portion 31 from being obstructed, preventing an increase in magnetic resistance in the yoke portion 31 and an increase in iron loss.

Similar to the first slot film 261, the other slot films 261-269 also press the connecting wires 531-539 against the windings 521-529, respectively. Because the slot films 261-269 press the connecting wires 531-539 against the windings 521-529, respectively, the motor 5 can prevent the connecting wires 531-539 from moving within the film inner space 73. For example, because the fourth connecting wire 534 does not move within the fourth right-side groove 364, the motor 5 can prevent the fourth connecting wire 534 from loosening.

[Motor manufacturing process]
The motor 5 is manufactured by a motor manufacturing process described below. In the motor manufacturing process, the slot films 261-269 are arranged in the slots 341-349, respectively, and attached to the stator core 23. The non-lead-side insulator 24 is attached to the stator core 23 so that the attachment surface 44 contacts the lower end surface 27 of the stator core 23. The lead-side insulator 25 is attached to the stator core 23 so that the attachment surface 44 contacts the upper end surface 28 of the stator core 23.

A winding machine is used to wind multiple conductors around the stator core 23, with the non-lead side insulator 24, lead side insulator 25, and multiple slot films 261-269 properly attached. The winding machine is equipped with a U-phase conductor nozzle, a V-phase conductor nozzle, and a W-phase conductor nozzle. By appropriately moving the U-phase conductor nozzle, the U-phase conductor of the multiple conductors can be aligned with the desired position on the stator core 23. By appropriately moving the V-phase conductor nozzle, the V-phase conductor of the multiple conductors can be aligned with the desired position on the stator core 23. By appropriately moving the W-phase conductor nozzle, the W-phase conductor of the multiple conductors can be aligned with the desired position on the stator core 23.

After the lead-side insulator 25, the non-lead-side insulator 24, and the multiple slot films 261-269 have been properly attached, the stator core 23 is set in the winding machine. The winding machine first moves the U-phase conductor nozzle appropriately to pass the U-phase conductor from the lead side of the first tooth portion 321 through the first slot 341 and slit 474, forming the fourth power supply wire 544 from the U-phase conductor.

After the fourth power supply wire 544 has been formed, the winding machine appropriately moves the U-phase conductor nozzle to align the U-phase conductor along the outer periphery of the outer wall portion 41 of the non-lead-side insulator 24, thereby forming the fourth jumper wire 564 from the U-phase conductor. After the fourth jumper wire 564 has been formed, the winding machine appropriately moves the U-phase conductor nozzle to pass the U-phase conductor through the slit 484 and align it inside the fourth right-side groove 364, thereby forming the fourth connecting wire 534 from the U-phase conductor. Because the fourth right-side groove 364 is large, the winding machine does not need to position the U-phase conductor nozzle with high precision, and the U-phase conductor can easily align itself inside the fourth right-side groove 364.

After the fourth connecting wire 534 is formed, the winding machine moves the U-phase conductor nozzle appropriately to wind the U-phase conductor counterclockwise around the fourth tooth 324, forming the fourth winding 524 from the U-phase conductor. After the fourth winding 524 is formed, the winding machine moves the U-phase conductor nozzle appropriately to position the U-phase conductor between the third slot 343 and the lead side of the fourth tooth 324, forming the fourth neutral conductor 554 from the U-phase conductor.

When forming the fourth power supply conductor 544, fourth jumper conductor 564, fourth connecting conductor 534, fourth winding conductor 524, and fourth neutral conductor 554, the winding machine moves the V-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the eighth power supply conductor 548, eighth jumper conductor 568, eighth connecting conductor 538, eighth winding conductor 528, and eighth neutral conductor 558 from the V-phase conductor. Because the eighth right-side groove 368 is large, the winding machine does not need to position the V-phase conductor nozzle with high precision, and the V-phase conductor can easily align within the eighth right-side groove 368.

When the fourth power supply conductor 544, fourth jumper conductor 564, fourth connecting conductor 534, fourth winding conductor 524, and fourth neutral conductor 554 are formed, the winding machine further moves the W-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the sixth power supply conductor 546, sixth jumper conductor 566, sixth connecting conductor 536, sixth winding conductor 526, and sixth neutral conductor 556 from the W-phase conductor. Because the sixth right-side groove 366 is large, the winding machine does not need to position the W-phase conductor nozzle with high precision, and the W-phase conductor can easily align within the sixth right-side groove 366.

After the fourth neutral conductor 554 has been formed, the winding machine appropriately moves the U-phase conductor nozzle to position the U-phase conductor between the lead side of the seventh tooth 327 and the seventh right-side groove 367, thereby forming the seventh neutral conductor 557 from the U-phase conductor. After the seventh neutral conductor 557 has been formed, the winding machine appropriately moves the U-phase conductor nozzle to align the U-phase conductor with the inside of the seventh right-side groove 367, thereby forming the seventh connecting wire 537 from the U-phase conductor. Because the seventh right-side groove 367 is large, the winding machine does not need to position the U-phase conductor nozzle with high precision, and can easily align the U-phase conductor with the inside of the seventh right-side groove 367.

After the seventh connecting wire 537 is formed, the winding machine appropriately moves the U-phase conductor nozzle to wind the U-phase conductor clockwise around the seventh tooth 327 and pass it through the slit 487, forming the seventh winding 527 from the U-phase conductor. After the seventh winding 527 is formed, the winding machine appropriately moves the U-phase conductor nozzle to align the U-phase conductor along the outer periphery of the outer wall 41, forming the seventh jumper 567 from the U-phase conductor. After the seventh jumper 567 is formed, the winding machine appropriately moves the U-phase conductor nozzle to pass the U-phase conductor through the slit 477 and the second slot 342 and place it on the lead side of the first tooth 321, forming the seventh power supply wire 547 from the U-phase conductor.

When forming the seventh neutral conductor 557, seventh connecting conductor 537, seventh winding 527, seventh jumper conductor 567, and seventh power supply conductor 547, the winding machine moves the V-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the second neutral conductor 552, second connecting conductor 532, second winding 522, second jumper conductor 562, and second power supply conductor 542 from the V-phase conductor. Because the second right-side groove 362 is large, the winding machine does not need to position the V-phase conductor nozzle with high precision, and the V-phase conductor can easily align within the second right-side groove 362.

When the seventh neutral conductor 557, seventh connecting conductor 537, seventh winding 527, seventh jumper conductor 567, and seventh power supply conductor 547 are formed, the winding machine also moves the W-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the ninth neutral conductor 559, ninth connecting conductor 539, ninth winding 529, ninth jumper conductor 569, and ninth power supply conductor 549 from the W-phase conductor. Because the seventh right-side groove 367 is large, the winding machine does not need to position the W-phase conductor nozzle with high precision, and the W-phase conductor can easily align within the seventh right-side groove 367.

After the seventh power supply conductor 547 is formed, the winding machine appropriately moves the U-phase conductor nozzle to position the U-phase conductor between the lead side of the first tooth 321 and the first left-hand groove 351, thereby forming the first power supply conductor 541 from the U-phase conductor. After the first power supply conductor 541 is formed, the winding machine appropriately moves the U-phase conductor nozzle to align the U-phase conductor with the inside of the first left-hand groove 351, thereby forming the first connecting wire 531 from the U-phase conductor. Because the first right-hand groove 361 is large, the winding machine does not need to position the U-phase conductor nozzle with high precision, and can easily align the U-phase conductor with the inside of the first right-hand groove 361.

After the first connecting wire 531 is formed, the winding machine moves the U-phase conductor nozzle appropriately to wind the U-phase conductor counterclockwise around the first tooth 321, forming the first winding 521 from the U-phase conductor. After the first winding 521 is formed, the winding machine moves the U-phase conductor nozzle appropriately to position the U-phase conductor between the ninth slot and the lead side of the first tooth 321, forming the first neutral conductor 551 from the U-phase conductor.

When forming the first power supply conductor 541, first connecting conductor 531, first winding 521, and first neutral conductor 551, the winding machine moves the V-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the fifth power supply conductor 545, fifth connecting conductor 535, fifth winding 525, and fifth neutral conductor 555 from the V-phase conductor. Because the fifth right-side groove 365 is large, the winding machine does not need to position the V-phase conductor nozzle with high precision, and the V-phase conductor can easily align within the fifth right-side groove 365.

When the first power supply conductor 541, first connecting conductor 531, first winding conductor 521, and first neutral conductor 551 are formed, the winding machine further moves the W-phase conductor nozzle in synchronization with the U-phase conductor nozzle to form the third power supply conductor 543, third connecting conductor 533, third winding conductor 523, and third neutral conductor 553 from the W-phase conductor. Because the third right-side groove 363 is large, the winding machine does not need to position the W-phase conductor nozzle with high precision, and the W-phase conductor can easily align within the third right-side groove 363.

After the fourth neutral conductor 554 and the seventh neutral conductor 557 are formed, the fourth neutral conductor 554 and the seventh neutral conductor 557 are disconnected. After the second neutral conductor 552 and the eighth neutral conductor 558 are formed, the second neutral conductor 552 and the eighth neutral conductor 558 are disconnected. After the sixth neutral conductor 556 and the ninth neutral conductor 559 are formed, the sixth neutral conductor 556 and the ninth neutral conductor 559 are disconnected. After being disconnected from each other, the multiple neutral conductors 551-559 are appropriately electrically connected to multiple neutral points. The multiple neutral conductors connected to one neutral point of the multiple neutral conductors 551-559 are twisted and bundled together. In the motor 5, even if three neutral wires for three phases connected to one neutral point are twisted and bundled on the outer peripheral surface of the lead-side insulator 25, the load on the multiple connection wires connected to the twisted neutral wires is reduced by arranging multiple connection wires inside the groove space 71. Note that the multiple neutral wires 551-559 connected to one neutral point do not have to be twisted. Furthermore, the multiple neutral wires 551-559 may be electrically connected to a single neutral point.

The first power wire 541, the fourth power wire 544, and the seventh power wire 547 are twisted and electrically connected to the U-phase power terminal 8U. The second power wire 542, the fifth power wire 545, and the eighth power wire 548 are twisted and electrically connected to the V-phase power terminal 8V. The third power wire 543, the sixth power wire 546, and the ninth power wire 549 are twisted and electrically connected to the W-phase power terminal 8W. Even when multiple power wires are twisted, the motor 5 can reduce the load on the multiple connection wires because the multiple connection wires connected to the twisted power wires among the multiple connection wires 531-539 are arranged inside the groove space 71, which is sized to allow the connection wires to move circumferentially.

The rotor 21 is fixed to the shaft 3 connected to the compression unit 6 and attached to the compression unit 6. The motor 5 is fabricated by inserting the rotor 21 attached to the compression unit 6 inside the stator 22. The motor 5 and compression unit 6 are inserted into the housing 2 and placed in a predetermined position within the internal space 7 of the housing 2. The stator core 23 is fixed to the housing 2 after the motor 5 and compression unit 6 have been placed in their predetermined positions. After the stator core 23 is fixed to the housing 2, the internal space 7 of the housing 2 is sealed and the compressor 1 is fabricated.

Note that the winding machine used in the motor manufacturing method is not limited to one equipped with three nozzles, and may be one equipped with, for example, one nozzle.

[Operation of Compressor 1]
The compressor 1 is provided in, for example, a refrigeration cycle device (not shown) and is used to compress a refrigerant and circulate the refrigeration cycle device. The motor 5 generates a rotating magnetic field in a space inside the stator 22 when a three-phase voltage is appropriately applied to multiple conductors via a U-phase power supply terminal 8U, a V-phase power supply terminal 8V, and a W-phase power supply terminal 8W. The rotor 21 rotates due to the rotating magnetic field generated by the stator 22. The shaft 3 transmits the rotation of the rotor 21 to the compression unit 6. As the shaft 3 rotates, the compression unit 6 draws in low-pressure gas refrigerant via the suction pipe 11, compresses the drawn low-pressure gas refrigerant, and generates high-pressure gas refrigerant. The high-pressure gas refrigerant is supplied to a space between the compression unit 6 and the motor 5 in the internal space 7.

High-pressure gas refrigerant supplied to the space between the compression section 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 refrigeration cycle system.

[Motor of Comparative Example 1]
As shown in FIG. 12 , the motor of Comparative Example 1 has the yoke portion 31 of the stator core 23 of the motor 5 of Example 1 replaced with another yoke portion 131, but the other parts are the same as those of the motor 5 of Example 1. FIG. 12 is an enlarged cross-sectional view of the motor of Comparative Example 1, showing the positional relationship between a part of the yoke portion 131 and the first connection wire 531, as viewed from the rotational axis direction. Unlike the yoke portion 31 described above, the yoke portion 131 does not have multiple recessed grooves 35, 36 formed therein. In the motor of Comparative Example 1, the first connection wire 531 is sandwiched between the inner circumferential surface 33 of the stator core and the first winding 521, and a load is applied to the first connection wire 531 so that the first connection wire 531 is crushed. When a load is applied, the first connection wire 531 is crushed, which may result in damage such as a broken wire.

In contrast, in the motor 5 of Example 1, the first connection line 531 is arranged in the groove space 71 inside the first left-side groove 351, thereby reducing the load applied to the first connection line 531 and preventing damage to the first connection line 531.

[Motor of Comparative Example 2]
As shown in FIG. 13 , the motor of Comparative Example 2 is identical to the motor 5 of Example 1 described above, except that the yoke portion 31 of the stator core 23 of the motor 5 of Example 1 described above is replaced with another yoke portion 231. FIG. 13 is an enlarged cross-sectional view, viewed from the rotational axis direction, showing the positional relationship between a portion of the yoke portion 231 of the motor of Comparative Example 2 and a first connection line 531. A plurality of grooves are formed in the yoke portion 231 to replace the plurality of grooves 35, 36 described above. The positions of the plurality of grooves in the yoke portion 231 correspond to the positions of the plurality of grooves 35, 36 in the yoke portion 31 described above. The first connection line 531 is disposed inside a groove 232 formed at a position corresponding to the position of the first left groove 351 described above. Groove 232 is formed smaller than the above-described first left-side groove 351 so that first connecting line 531 cannot move inside groove 232, i.e., so that first connecting line 531 is embedded in groove 232. Groove 232 is further formed so that the circumferential width of groove 232 is smaller than the circumferential width of first left-side groove 351, for example, so that the circumferential width of groove 232 is about 1.5 times the wire diameter of first connecting line 531.

In the motor of Comparative Example 2, the first slot film 261 described above has been replaced with another slot film 233. The slot film 233 has a recess 234 formed in the yoke-facing portion 63 of the first slot film 261 described above, and is otherwise identical to the first slot film 261 described above. The recess 234 is formed by folding the yoke-facing portion 63 of the slot film 233. The recess 234 is also formed so that when the slot film 233 is attached to the stator core 23, the recess 234 of the slot film 233 fits closely along the groove 232.

In the motor of Comparative Example 2, the slot film 233 has a recess 234 formed therein. This requires an additional step of folding the slot film 233 to form the recess 234, compared to the first slot film 261 of the motor 5 of Example 1, resulting in increased manufacturing costs. Furthermore, in the motor of Comparative Example 2, when the slot film 233 is attached to the stator core 23, the recess 234 of the slot film 233 must be positioned inside the recessed groove 232. This requires high dimensional accuracy for the recess 234 of the slot film 233 and the recessed groove 232 of the stator core 23, resulting in increased manufacturing costs. Furthermore, in the motor of Comparative Example 2, when the first connection wire 531 is positioned inside the recessed groove 232, the narrow circumferential width of the recessed groove 232 necessitates highly accurate positioning of the nozzle of the winding machine.

In contrast, the first slot film 261 of the motor 5 of Example 1 does not have a recess 234, making it easier to manufacture than the slot film 233 of the motor of Comparative Example 2. In the motor 5 of Example 1, the recesses 234 are not formed in the multiple slot films 261-269, making it easier to attach the multiple slot films 261-269 to the stator core 23. In the motor 5 of Example 1, the first left groove 351 has a larger circumferential width. Therefore, when placing the first connection line 531 inside the first left groove 351, the first connection line 531 can be easily positioned inside the first left groove 351, even if the nozzle positioning accuracy is lower compared to the motor of Comparative Example 2. This simplifies the process of placing the first left groove 351 inside the first left groove 351. Therefore, the motor 5 of Example 1 can be manufactured more easily than the motor of Comparative Example 2.

[Effects of Compressor 1 of Example 1]
The motor 5 of the first embodiment includes a rotor 21 and a stator 22. The stator 22 includes a yoke portion 31, first teeth 321, a first winding 521, a first connecting wire 531, and a first slot film 261. The yoke portion 31 is formed in an annular shape and surrounds the outer periphery of the rotor 21. The first teeth 321 are formed integrally with the yoke portion 31 and protrude from the yoke portion 31 toward the rotor 21. The first winding 521 is wound around the first teeth 321. The first connecting wire 531 is connected to the first winding 521. The first slot film 261 separates the yoke portion 31 and the first winding 521, and also separates the yoke portion 31 and the first connecting wire 531. A first left-side groove 351 is formed in the yoke part 31. The first left-side groove 351 is recessed radially outward from the inner circumferential surface 33 of the yoke part 31 that faces the first winding 521, so that a groove space 71 in which the first connecting wire 531 is disposed is formed between the first winding 521 and the yoke part 31. The groove space 71 is formed to a size that allows the first connecting wire 531 to move circumferentially within the groove space 71.

In this case, the motor 5 of Example 1 can prevent the first connecting wire 531 from being pinched between the yoke portion 31 and the first winding 521, thereby reducing the load on the first connecting wire 531. Furthermore, the groove space 71 formed by the first left groove 351 is large enough to allow the first connecting wire 531 to move circumferentially. Therefore, in the process of arranging the first connecting wire 531 so that it passes through the inside of the first left groove 351 and the process of winding the first winding 521 around the first teeth 321 after arranging the first connecting wire 531 inside the first left groove 351, the process of arranging the first connecting wire 531 inside the first left groove 351 before the first winding 521 is wound around the teeth can be simplified, thereby facilitating manufacturing.

Furthermore, the compressor 1 equipped with the motor 5 of Example 1 includes a compression unit 6 driven by the power generated by the rotation of the motor 5, and a housing 2 having an enclosed space disposed therein for housing the motor 5 and compression unit 6. By including the motor 5 of Example 1, the compressor 1 can be manufactured more easily.

Incidentally, the non-lead-side insulator 24 and the lead-side insulator 25 of the motor 5 in Example 1 described above have multiple recesses 46 through which the multiple connection wires 531-539 pass. However, these recesses 46 may be omitted. Even when multiple recesses 46 are formed, the motor 5 can prevent the first connection wire 531 from being pinched between the yoke portion 31 and the first winding 521, reducing the load on the first connection wire 531 and simplifying manufacturing.

The multiple recesses 46 may also be formed only on one axial end of each insulator. For example, the multiple recesses 46 formed in the non-lead-side insulator 24 and the lead-side insulator 25 may be formed only on the end facing the stator core 23, and the end not facing the stator core 23 may be formed to conform to the inner circumferential surface 33 of the stator core 23, eliminating the need for recesses. In this case, the first connection wire 531 is prevented from being pinched between the yoke portion 31 and the first winding 521, and the first winding 521 is restricted to the end of the non-lead-side insulator 24 and the lead-side insulator 25 on the side where no recesses are formed, thereby preventing the first winding 521 from entering the groove space 71 and narrowing the size of the groove space 71.

Incidentally, the first left-side groove 351 of the motor 5 in the first embodiment described above has a depth that decreases as it approaches the circumferential edge, but it may also be formed to have the same depth. Even in this case, the motor 5 can reduce the load applied to the first connection line 531 and simplify the process of placing the first connection line 531 inside the first left-side groove 351.

While the fourth power line 544 and the seventh power line 547 of the motor 5 in the first embodiment described above are not disposed in the groove space 71 inside the first left-hand groove 351, portions of them may be disposed in the groove space 71 of the first left-hand groove 351 together with the first connecting line 531. Similarly, portions of the second power line 542 and the eighth power line 548 may be disposed in the groove space 71 of the fifth left-hand groove 355 together with the fifth connecting line 535. Portions of the sixth power line 546 and the ninth power line 549 may be disposed in the groove space 71 of the third left-hand groove 353 together with the third connecting line 533. In this case, the motor can further prevent multiple power lines from being pinched between the yoke portion 31 and the windings, thereby reducing the load on the multiple power lines.

As shown in Figure 14, the motor of Example 2 replaces the first slot film 261 of the motor 5 of Example 1 with another slot film 81, but is otherwise identical to the motor 5 of Example 1. Figure 14 is an enlarged cross-sectional view, viewed from the rotation axis direction, showing the positional relationship between a portion of the yoke portion 31 of the motor of Example 2 and the first connecting line 531. The slot film 81 has a recess 82 formed in the yoke-facing portion 63 of the first slot film 261, but is otherwise identical to the first slot film 261. The recess 82 is formed by forming a crease in the yoke-facing portion 63 of the slot film 81. The recess 82 is further formed so that when the slot film 81 is attached to the stator core 23, the recess 82 fits closely along the first left groove 351.

Like the motor 5 of Example 1 described above, the motor of Example 2 can prevent the first connecting wire 531 from being pinched between the yoke portion 31 and the first winding 521, thereby reducing the load on the first connecting wire 531. Like the motor 5 of Example 1 described above, the motor 5 of Example 1 can also simplify the process of positioning the first connecting wire 531 inside the first left-side groove 351 before the first winding 521 is wound around the teeth, thereby facilitating manufacturing.

Here, the characteristic effects of the motor of Example 1 will be explained in comparison with Example 2. The first slot film 261 of the motor 5 of Example 1 described above does not have a recess 82 formed therein, and is therefore easier to manufacture than the slot film 81 of the motor of Example 2. For this reason, the motor 5 of Example 1 described above can be manufactured even more easily than the motor of Example 2.

In the motor of Example 2, the recess 82 of the first slot film 261 is not elastically deformed, and the first connecting wire 531 placed inside the first left-hand groove 351 is not pressed against the first winding 521. In the motor 5 of Example 1 described above, the yoke-facing portion 63 of the first slot film 261 is elastically deformed, and the elastic force of the first slot film 261 presses the first connecting wire 531 against the first winding 521. Therefore, compared to the motor of Example 2, the motor 5 of Example 1 described above is able to further prevent the first connecting wire 531 from moving inside the first left-hand groove 351.

In the motor 5 of Example 1, even if the portion of the first connecting wire 531 located inside the first left-hand groove 351 is slightly misaligned circumferentially within the groove space 71, the groove-positioned portion 64 of the first slot film 261 bulges outward to match the position of the first connecting wire 531, thereby forming a film inner-periphery side space 73 and a film outer-periphery side space 72 of appropriate sizes according to the position of the portion of the first connecting wire 531. Furthermore, within the groove space 71, a film outer-periphery side space 72 partitioned by the first slot film 261 is formed on the outer side of the film inner-periphery side space 73 in which the first connecting wire 531 is located. This prevents the first connecting wire 531 from being sandwiched between the yoke portion 31 and the first winding 521, thereby reducing the load on the first connecting wire 531. Meanwhile, the elastically deformed first slot film 261 has an elastic force (restoring force) that causes the bulging portion (connection wire contact portion 641) toward the outer diameter of the groove arrangement portion 64 to return to its original shape, pressing the first connection wire 531 against the first winding 521. As a result, the motor 5 of Example 1 is able to restrict movement of the first connection wire 531 within the groove space 71 (first left groove 351) more effectively than the motor of Example 2.

Although the embodiments have been described above, the embodiments are not limited to the above content. Furthermore, the components described above include those that would be easily conceivable by a person skilled in the art, those that are substantially the same, and those that are within the scope of what is known as equivalents. Furthermore, the components described above can be combined as appropriate. Furthermore, at least one of various omissions, substitutions, and modifications of the components can be made without departing from the spirit of the embodiments.

1: Compressor 2: Housing 5: Motor 6: Compression section 21: Rotor 22: Stator 23: Stator core 24: Non-lead side insulator 25: Lead side insulator 261 to 269: Multiple slot films 31: Yoke section 321 to 329: Multiple teeth sections 33: Inner peripheral surface (stator core)
35, 36: Multiple recessed grooves 41: Outer peripheral wall portion 43: Inner peripheral surface (insulator)
46: Multiple recesses 521 to 529: Multiple windings 531 to 539: Multiple connection lines 541 to 549: Multiple power lines 551 to 559: Multiple neutral lines 562 to 569: Multiple crossover lines 71: Space within the groove 72: Space on the outer periphery of the film (second space)
73: Film inner peripheral side space (first space)

Claims (12)

A rotor,
a stator;
The stator includes:
an annular yoke portion surrounding the outer periphery of the rotor;
teeth formed integrally with the yoke and protruding from the yoke toward the rotor;
a winding wound around the tooth portion;
a connecting wire connected to the winding;
a film separating the yoke portion from the winding and separating the yoke portion from the connecting wire,
a recessed groove recessed from an inner circumferential surface of the yoke portion facing the winding toward an outer diameter side is formed in the yoke portion so as to form a space in which the connecting wire is disposed between the winding and the yoke portion;
the space is formed to have a size that allows the connection line to move circumferentially within the space ,
The connecting wire is pressed against the winding by the elastic force of the film . The motor according to claim 1 , wherein the width of the groove in the circumferential direction is greater than twice the length of the diameter of the connecting wire. The motor according to claim 1 or 2, wherein the recessed groove is formed so that the depth of the recessed groove becomes shallower as it approaches an edge in the circumferential direction of the recessed groove. The space is
a first space formed between the film and the winding, in which the connecting wire is disposed;
a second space formed between the film and the yoke portion,
The motor according to any one of claims 1 to 3. the film is bent radially outward at a position corresponding to the recessed groove in the circumferential direction by contacting the connecting wire;
The motor according to any one of claims 1 to 4 . The motor according to claim 1 , wherein the film further separates the teeth and the windings. another tooth portion formed integrally with the yoke portion and protruding from the yoke portion toward the rotor;
Another winding wound around the other tooth portion;
an annular insulator that contacts an axial end of the yoke portion;
the connecting wire has a crossover wire connected to another winding and disposed on the outer circumferential side of the insulator,
The insulator has a slit formed at a position corresponding to the recessed groove in the circumferential direction, through which the connecting wire having the crossover wire passes.
The motor according to any one of claims 1 to 6 . The motor according to claim 7 , wherein the insulator has a recess formed in a position corresponding to the recess in the circumferential direction and continuing in the axial direction from the recess. The motor according to any one of claims 1 to 8 , wherein the winding is electrically connected to a power source or a neutral point via the connecting wire. A motor according to any one of claims 1 to 9 ;
a compression section driven by the power of rotation of the rotor;
a housing having an enclosed space formed therein for accommodating the motor and the compression unit;
A compressor comprising: A motor manufacturing method for manufacturing the motor according to any one of claims 1 to 9 , comprising the steps of:
placing the connecting wire inside the groove;
and winding the winding around the teeth after the connection wire is placed inside the groove. A rotor,
a stator;
The stator includes:
an annular yoke portion surrounding the outer periphery of the rotor;
a plurality of teeth that are arranged at equal intervals in the circumferential direction and are integrally formed with the yoke portion and protrude from the yoke portion toward the rotor;
a plurality of windings wound around the plurality of teeth;
a plurality of connection wires connected to the plurality of windings;
a plurality of films separating the yoke portion from the plurality of windings and separating the yoke portion from the plurality of connecting wires;
The yoke portion is formed with a plurality of recessed grooves recessed from the inner circumferential surface of the yoke portion to the outer diameter side,
The plurality of grooves are
a plurality of left recessed grooves corresponding to the plurality of teeth;
a plurality of right grooves corresponding to the plurality of teeth,
The plurality of grooves are
a recessed groove in which any one of the plurality of connection lines is disposed;
a recessed groove in which none of the plurality of connection lines is disposed,
The plurality of grooves are formed to have a size that allows each of the plurality of connection lines to move circumferentially within a space formed inside each of the plurality of grooves.
Motor.