JP7501391B2 - Motors and Compressors - Google Patents

Description

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

Concentrated winding type electric motors include a rotor equipped with permanent magnets and a stator that generates a rotating magnetic field to rotate the rotor, with multiple winding sections (coils) formed by winding conductors (electric wires) around each of the multiple teeth of the stator. A known structure for this type of electric motor is one in which an inter-coil insulator is provided in the gap between adjacent winding sections facing each other in the circumferential direction of the stator to ensure proper insulation between the winding sections (Patent Document 1). The inter-coil insulator is inserted and attached into the gap after each winding section is formed on the stator.

For example, in an electric motor used in a compressor, when gas discharged from the compression section passes through the electric motor, the gas may move the inter-coil insulator in the radial direction or axial direction of the stator (the direction of the rotor's rotation axis), which may cause the inter-coil insulator to come into contact with the rotor. For this reason, in Patent Document 1, a movement restriction means is provided in the slot insulator (described later) to prevent the inter-coil insulator from moving in the radial direction of the stator. Specifically, both ends of the slot insulator, which is disposed between adjacent teeth in the circumferential direction of the stator, protrude into the gap between adjacent winding sections, and both ends of the slot insulator restrict the inter-coil insulator from moving inward in the radial direction of the stator.

JP 2017-17972 A

In the winding process, in which the conductor wire is wound around the teeth, the nozzle of the winding machine enters between the teeth and repeatedly moves in the axial direction of the stator to form a winding section (coil) as the conductor wire is wound around the teeth, supplied from the nozzle. In the above-mentioned Patent Document 1, the ends of the slot insulator protrude into the gap between adjacent winding sections, narrowing the distance between the ends of the slot insulator, which causes a problem that the winding action of the nozzle in the winding process is hindered by the ends of the slot insulator. As a result, the nozzle is likely to come into contact with both ends of the slot insulator, which may cause the slot insulator to wear out or be damaged as the nozzle moves.

The disclosed technology has been developed in consideration of the above, and aims to provide an electric motor and compressor that can restrict the movement of the inter-coil insulator relative to the stator using a movement restriction means, and can prevent the winding operation during the winding process of the conductor from being hindered by the movement restriction means.

One aspect of an electric motor disclosed in the present application includes a rotor and an annular stator that generates a magnetic field to rotate the rotor, the stator having a plurality of teeth spaced apart around the circumferential direction of the stator, a winding portion formed by winding a conductor around each of the plurality of teeth, a neutral wire connected to one end of the conductor forming the winding portion, and inter-coil insulators that are arranged in gaps between adjacent winding portions around the circumferential direction of the stator to insulate the winding portions from each other, the inter-coil insulators having a bent portion that extends radially outward of the stator and folds back on the outside to extend radially inward of the stator, and the radially inward movement of the inter-coil insulator is restricted by a neutral wire passed inside the bent portion.

According to one aspect of the electric motor disclosed in the present application, the movement of the inter-coil insulator relative to the stator can be restricted by the movement restricting means, and the winding operation during the winding process can be prevented from being hindered by the movement restricting means.

FIG. 1 is a vertical cross-sectional view showing a compressor equipped with a three-phase motor according to an embodiment of the present invention. FIG. 2 is a plan view showing the three-phase motor of the embodiment as viewed from the upper insulator side. FIG. 3 is a bottom view showing the stator core in the embodiment. FIG. 4 is a perspective view showing a lower insulator in the embodiment. FIG. 5 is a bottom view showing the stator in the embodiment. FIG. 6 is a development view showing a plurality of windings in the embodiment. FIG. 7 is a wiring diagram showing the connection state of a plurality of winding parts in the embodiment. FIG. 8 is a plan view showing a state in which each neutral wire is drawn out from the stator in the embodiment. FIG. 9 is an enlarged plan view showing a slot insulator provided in a stator in the embodiment. FIG. 10 is a plan view showing an inter-coil insulator provided in a stator in the embodiment. FIG. 11 is an enlarged plan view showing an inter-coil insulator in the embodiment. FIG. 12 is a perspective view for explaining a state in which the inter-coil insulator is folded in the embodiment. FIG. 13 is a plan view showing a folded state of the inter-coil insulation in the embodiment. FIG. 14 is a side view showing an inter-coil insulator in the embodiment. FIG. 15 is an enlarged perspective view of a groove in an inter-coil insulator in the embodiment. FIG. 16 is a side view showing a state in which the inter-coil insulator in the embodiment is attached to the stator. FIG. 17 is a plan view showing an inter-coil insulator according to the first modification. FIG. 18 is a perspective view for illustrating a state in which the inter-coil insulator of the first modification is folded. FIG. 19 is a plan view showing a folded state of the inter-coil insulator of the first modification. FIG. 20 is a side view showing an inter-coil insulator according to the second modification. FIG. 21 is a side view showing an inter-coil insulator according to the third modification.

Below, examples of the electric motor and compressor disclosed in the present application are described in detail with reference to the drawings. Note that the electric motor and compressor disclosed in the present application are not limited to the following examples.

1 is a longitudinal sectional view showing a compressor equipped with a three-phase motor of an embodiment. As shown in FIG. 1, the compressor 1 is a so-called rotary compressor, and includes a container 2, a shaft 3, a compression section 5, and a three-phase motor 6 as an electric motor. The container 2 forms a sealed internal space 7. The internal space 7 is formed in a roughly cylindrical shape. The container 2 is formed so that the central axis of the cylinder forming the internal space 7 is parallel to the vertical direction when the container 2 is placed upright on a horizontal surface. The container 2 has an oil reservoir 8 formed at the bottom of the internal space 7. The oil reservoir 8 stores refrigeration oil, which is a lubricating oil that lubricates the compression section 5. The container 2 is connected to a suction pipe 11 for sucking in a refrigerant and a discharge pipe 12 for discharging the compressed refrigerant. The shaft 3 as a rotating shaft is formed in a rod shape and is arranged in the internal space 7 of the container 2 so that one end is arranged in the oil reservoir 8. The shaft 3 is supported by the container 2 so as to be rotatable around the central axis of the cylinder forming the internal space 7. As the shaft 3 rotates, it supplies the refrigeration oil stored in the oil reservoir 8 to the compression section 5.

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

The compression section 5 compresses the refrigerant supplied from the suction pipe 11 as the shaft 3 rotates, and supplies the compressed refrigerant to the upper muffler chamber 16 and the lower muffler chamber 17. The refrigerant is compatible with refrigeration oil. The three-phase motor 6 is located above the compression section 5 in the internal space 7.

Figure 2 is a plan view showing the three-phase motor 6 in the embodiment from the upper insulator side. As shown in Figures 1 and 2, the three-phase motor 6 includes a rotor 21 and a stator 22. The rotor 21 is formed into a cylindrical shape by laminating multiple thin silicon steel plates (magnetic material) and is integrated with multiple rivets 9. The rotor 21 has six slit-shaped magnet embedding holes 10a formed on the center of the rotor 21, to which the shaft 3 is inserted and fixed, forming each side of a hexagon with the shaft 3 as the center. The magnet embedding holes 10a are formed at a predetermined interval in the circumferential direction of the rotor 21. Plate-shaped permanent magnets 10b are embedded in the magnet embedding holes 10a.

The stator 22 is formed in a generally cylindrical shape, is disposed so as to surround the rotor 21, and is fixed to the container 2. The stator 22 includes a stator core 23, an upper insulator 24, a lower insulator 25, and a plurality of conductors 45. The upper insulator 24 is fixed to the upper part of the stator core 23. The lower insulator 25 is fixed to the lower part of the stator core 23. The upper insulator 24 and the lower insulator 25 are an example of an insulating part that insulates the stator core 23 from the conductors 45.

Figure 3 is a bottom view showing the stator core 23 in the embodiment. The stator core 23 is formed by stacking a plurality of plates made of a soft magnetic material, such as silicon steel plate, and as shown in Figure 3, includes a yoke portion 31 and a plurality of stator core teeth portions 32-1 to 32-9. The yoke portion 31 is formed in a generally cylindrical shape. The first stator core teeth portion 32-1 of the plurality of stator core teeth portions 32-1 to 32-9 is formed in a generally columnar shape. The first stator core teeth portion 32-1 is formed so that one end is continuous with the inner peripheral surface of the yoke portion 31, that is, protrudes from the inner peripheral surface of the yoke portion 31. The stator core teeth portions different from the first stator core teeth portion 32-1 of the plurality of stator core teeth portions 32-1 to 32-9 are also formed in a generally columnar shape, similar to the first stator core teeth portion 32-1, and protrude from the inner peripheral surface of the yoke portion 31. The multiple stator core teeth 32-1 to 32-9 are further formed on the inner circumferential surface of the yoke portion 31, spaced at equal intervals of 40 degrees.

Figure 4 is a perspective view showing the lower insulator 25 in the embodiment. The lower insulator 25 is formed of an insulator such as polybutylene terephthalate resin (PBT), and as shown in Figure 4, has an outer peripheral wall portion 41, a plurality of insulator teeth portions 42-1 to 42-9 (also referred to as insulator teeth portions 42), and a plurality of flange portions 43-1 to 43-9. The outer peripheral wall portion 41 is formed in a generally cylindrical shape. A plurality of slits 44 are formed in the outer peripheral wall portion 41. The first insulator teeth portion 42-1 of the multiple insulator teeth portions 42-1 to 42-9 is formed in a straight column shape with a cross section that is generally semicircular. One end of the first insulator teeth portion 42-1 is formed continuously with the inner peripheral surface of the outer peripheral wall portion 41, that is, it is formed so as to protrude from the inner peripheral surface of the outer peripheral wall portion 41. Among the multiple insulator teeth 42-1 to 42-9, the insulator teeth different from the first insulator teeth 42-1 are also formed in a straight column shape and, like the first insulator teeth 42-1, are formed so as to protrude from the inner peripheral surface of the outer peripheral wall 41. The multiple insulator teeth 42-1 to 42-9 are formed on the inner peripheral surface of the outer peripheral wall 41 and are arranged at equal intervals of 40 degrees.

The multiple flanges 43-1 to 43-9 correspond to the multiple insulator teeth 42-1 to 42-9, and are each formed in a roughly semicircular plate shape. Of the multiple flanges 43-1 to 43-9, the first flange 43-1 corresponding to the first insulator tooth 42-1 is formed continuous with the other end of the first insulator tooth 42-1. The multiple flanges 43-1 to 43-9 that are different from the first flange 43-1 are also formed continuous with the other ends of the multiple insulator teeth 42-1 to 42-9, similar to the first flange 43-1.

The upper insulator 24 is formed in the same manner as the lower insulator 25. That is, the upper insulator 24 is formed from an insulating material and has an outer peripheral wall portion 41, a plurality of insulator teeth portions 42-1 to 42-9, and a plurality of flange portions 43-1 to 43-9.

Figure 5 is a bottom view showing the stator 22 in the embodiment. As shown in Figure 5, a plurality of conductor wires 45 are wound around each of the stator core teeth 32-1 to 32-9 (hereinafter also referred to as stator core teeth 32) of the stator core 23. A winding section (coil) 46 is formed around each of the stator core teeth 32-1 to 32-9 by winding the respective conductor wires 45. The three-phase motor 6 in the embodiment is a concentrated winding type motor with 6 poles and 9 slots (see Figure 2). The winding sections (coils) 46 include a plurality of U-phase coils 46-U1 to 46-U3, a plurality of V-phase coils 46-V1 to 46-V3, and a plurality of W-phase coils 46-W1 to 46-W3.

The U-phase coil has multiple winding portions (coils). Specifically, the U-phase coil has a first U-phase coil 46-U1, a second U-phase coil 46-U2, and a third U-phase coil 46-U3. The first U-phase coil 46-U1 is wound around the fourth stator core teeth portion 32-4. The second U-phase coil 46-U2 is wound around the seventh stator core teeth portion 32-7. The third U-phase coil 46-U3 is wound around the first stator core teeth portion 32-1.

The V-phase coil has multiple winding portions (coils). Specifically, the V-phase coil has a first V-phase coil 46-V1, a second V-phase coil 46-V2, and a third V-phase coil 46-V3. The first V-phase coil 46-V1 is wound around the eighth stator core teeth portion 32-8. The second V-phase coil 46-V2 is wound around the second stator core teeth portion 32-2. The third V-phase coil 46-V3 is wound around the fifth stator core teeth portion 32-5.

The W-phase coil has multiple winding portions (coils). Specifically, the W-phase coil has a first W-phase coil 46-W1, a second W-phase coil 46-W2, and a third W-phase coil 46-W3. The first W-phase coil 46-W1 is wound around the sixth stator core teeth portion 32-6. The second W-phase coil 46-W2 is wound around the ninth stator core teeth portion 32-9. The third W-phase coil 46-W3 is wound around the third stator core teeth portion 32-3.

The third U-phase coil 46-U3 is wound around the first stator core teeth portion 32-1, together with the first insulator teeth portion 42-1 of the lower insulator 25, the first insulator teeth portion of the upper insulator 24, and the slot insulator 26 (see FIG. 3) arranged between the upper insulator 24 and the lower insulator 25. The slot insulator 26 is arranged between the stator core teeth portions 32 adjacent to each other in the circumferential direction of the stator 22, thereby electrically insulating the stator core teeth portion 32 and the coil 46. The slot insulator 26 is formed of an insulating material such as a resin film. Therefore, the third U-phase coil 46-U3 is properly insulated from the first stator core teeth portion 32-1 and from the stator core 23 by the upper insulator 24 and the lower insulator 25. Furthermore, the third U-phase coil 46-U3 is wound so as to be sandwiched between the first flange 43-1 and the outer peripheral wall 41 of the lower insulator 25, and is wound so as to be sandwiched between the first flange and the outer peripheral wall of the upper insulator 24. Therefore, the upper insulator 24 and the lower insulator 25 prevent the third U-phase coil 46-U3 from coming off the first stator core teeth 32-1 toward the rotor 21, that is, from being unwound.

As for the other coils among the multiple coils 46 that are different from the third U-phase coil 46-U3, the upper insulator 24 and the lower insulator 25 provide adequate insulation from the stator core 23 to prevent unwinding.

FIG. 6 is a development view showing a plurality of winding portions (coils) 46 in the embodiment. As shown in FIG. 6, the first U-phase coil 46-U1 is wound counterclockwise (CCW: Counter ClockWise) around the fourth stator core teeth portion 32-4. The second U-phase coil 46-U2 is wound clockwise (CW: ClockWise) around the seventh stator core teeth portion 32-7. The third U-phase coil 46-U3 is wound counterclockwise around the first stator core teeth portion 32-1. The first V-phase coil 46-V1 is wound counterclockwise around the eighth stator core teeth portion 32-8. The second V-phase coil 46-V2 is wound clockwise around the second stator core teeth portion 32-2. The third V-phase coil 46-V3 is wound counterclockwise around the fifth stator core teeth portion 32-5. The first W-phase coil 46-W1 is wound counterclockwise around the sixth stator core teeth portion 32-6. The second W-phase coil 46-W2 is wound clockwise around the ninth stator core teeth portion 32-9. The third W-phase coil 46-W3 is wound counterclockwise around the third stator core teeth portion 32-3.

The stator 22 further includes a plurality of U-phase neutral wires 47-U1 to 47-U3, a plurality of V-phase neutral wires 47-V1 to 47-V3, and a plurality of W-phase neutral wires 47-W1 to 47-W3. The plurality of U-phase neutral wires 47-U1 to 47-U3, the plurality of V-phase neutral wires 47-V1 to 47-V3, and the plurality of W-phase neutral wires 47-W1 to 47-W3 (hereinafter also referred to as neutral wires 47) are arranged on the upper insulator 24 side, which is farther from the lower insulator 25 than the plurality of stator core teeth portions 32-1 to 32-9. Note that the lead side, which is the power supply line, is also arranged on the upper insulator 24 side, so hereinafter in this specification, the upper insulator 24 side is also referred to as the lead side.

The first U-phase neutral wire 47-U1 has one end electrically connected to the first U-phase coil 46-U1. The first U-phase neutral wire 47-U1 has one end arranged on the first direction side (left side in FIG. 6) of the fourth stator core teeth portion 32-4, and the other end arranged on the lead side farther from the lower insulator 25 than the fourth stator core teeth portion 32-4. The second U-phase neutral wire 47-U2 has one end electrically connected to the second U-phase coil 46-U2. The second U-phase neutral wire 47-U2 has one end arranged on the first direction side of the seventh stator core teeth portion 32-7, and the other end arranged on the lead side than the seventh stator core teeth portion 32-7. The third U-phase neutral wire 47-U3 has one end electrically connected to the third U-phase coil 46-U3. One end of the third U-phase neutral wire 47-U3 is located on the first direction side of the first stator core teeth portion 32-1, and the other end is located on the lead side of the first stator core teeth portion 32-1.

The multiple V-phase neutral wires 47-V1 to 47-V3 include a first V-phase neutral wire 47-V1, a second V-phase neutral wire 47-V2, and a third V-phase neutral wire 47-V3. One end of the first V-phase neutral wire 47-V1 is electrically connected to the first V-phase coil 46-V1. One end of the first V-phase neutral wire 47-V1 is arranged on the first direction side of the fifth stator core teeth portion 32-5, and the other end is arranged on the lead side of the fifth stator core teeth portion 32-5. One end of the second V-phase neutral wire 47-V2 is electrically connected to the second V-phase coil 46-V2. One end of the second V-phase neutral wire 47-V2 is arranged on the first direction side of the second stator core teeth portion 32-2, and the other end is arranged on the lead side of the second stator core teeth portion 32-2. One end of the third V-phase neutral wire 47-V3 is electrically connected to the third V-phase coil 46-V3. One end of the third V-phase neutral wire 47-V3 is disposed on the first direction side of the fifth stator core teeth portion 32-5, and the other end is disposed on the lead side of the fifth stator core teeth portion 32-5.

The multiple W-phase neutral wires 47-W1 to 47-W3 include a first W-phase neutral wire 47-W1, a second W-phase neutral wire 47-W2, and a third W-phase neutral wire 47-W3. One end of the first W-phase neutral wire 47-W1 is electrically connected to the first W-phase coil 46-W1. One end of the first W-phase neutral wire 47-W1 is arranged on the first direction side of the sixth stator core teeth part 32-6, and the other end is arranged on the lead side of the sixth stator core teeth part 32-6. One end of the second W-phase neutral wire 47-W2 is electrically connected to the second W-phase coil 46-W2. One end of the second W-phase neutral wire 47-W2 is arranged on the first direction side of the ninth stator core teeth part 32-9, and the other end is arranged on the lead side of the ninth stator core teeth part 32-9. One end of the third W-phase neutral wire 47-W3 is electrically connected to the third W-phase coil 46-W3. One end of the third W-phase neutral wire 47-W3 is disposed on the first direction side of the third stator core teeth portion 32-3, and the other end is disposed on the lead side of the third stator core teeth portion 32-3.

The stator 22 further includes a plurality of U-phase power lines 48-U1 to 48-U3, a plurality of V-phase power lines 48-V1 to 48-V3, and a plurality of W-phase power lines 48-W1 to 48-W3. The plurality of U-phase power lines 48-U1 to 48-U3, the plurality of V-phase power lines 48-V1 to 48-V3, and the plurality of W-phase power lines 48-W1 to 48-W3 are also referred to as power lines 48.

One end of each of the multiple U-phase power wires 48-U1 to 48-U3 is disposed on the lead side of the first stator core teeth portion 32-1, and the other end is disposed on the second direction side (the right side in FIG. 6) of the first stator core teeth portion 32-1. The other end of the first U-phase power wire 48-U1 is electrically connected to the first U-phase coil 46-U1. The other end of the second U-phase power wire 48-U2 is electrically connected to the second U-phase coil 46-U2. The other end of the third U-phase power wire 48-U3 is electrically connected to the third U-phase coil 46-U3.

The first U-phase power line 48-U1 further includes a first U-phase crossover portion 49-U1, which passes through a plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25. The first U-phase crossover portion 49-U1, which is a portion of the first U-phase power line 48-U1, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second U-phase power line 48-U2 further includes a second U-phase crossover portion 49-U2, which passes through a plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25. The second U-phase crossover portion 49-U2, which is a portion of the second U-phase power line 48-U2, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25.

One end of each of the multiple V-phase power lines 48-V1 to 48-V3 is disposed on the lead side of the fifth stator core teeth portion 32-5, and the other end is disposed on the second direction side of the fifth stator core teeth portion 32-5. The other end of the first V-phase power line 48-V1 is electrically connected to the first V-phase coil 46-V1. The other end of the second V-phase power line 48-V2 is electrically connected to the second V-phase coil 46-V2. The other end of the third V-phase power line 48-V3 is electrically connected to the third V-phase coil 46-V3.

The first V-phase power line 48-V1 further includes a first V-phase jumper portion 49-V1, part of which passes through a plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25. The first V-phase jumper portion 49-V1, which is part of the first V-phase power line 48-V1, is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second V-phase power line 48-V2 further includes a second V-phase jumper portion 49-V2, which is part of the second V-phase power line 48-V2, is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25.

One end of each of the multiple W-phase power wires 48-W1 to 48-W3 is disposed on the lead side of the third stator core teeth portion 32-3, and the other end is disposed on the second direction side of the third stator core teeth portion 32-3. The other end of the first W-phase power wire 48-W1 is electrically connected to the first W-phase coil 46-W1. The other end of the second W-phase power wire 48-W2 is electrically connected to the second W-phase coil 46-W2. The other end of the third W-phase power wire 48-W3 is electrically connected to the third W-phase coil 46-W3.

The first W-phase power wire 48-W1 further includes a first W-phase jumper portion 49-W1, part of which passes through a plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25. The first W-phase jumper portion 49-W1, which is part of the first W-phase power wire 48-W1, is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second W-phase power wire 48-W2 further includes a second W-phase jumper portion 49-W2, which is part of the second W-phase power wire 48-W2, is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25.

Figure 7 is a wiring diagram showing the connection state of multiple coils 46 in the embodiment. The three-phase motor 6 in the embodiment is a motor having a star connection in which the coils 46 are connected in parallel. As shown in Figure 7, the stator 22 further includes multiple neutral points 51. The multiple neutral points 51 are arranged on the lead side of the multiple stator core teeth portions 32-1 to 32-9, and include a first neutral point 51-1, a second neutral point 51-2, and a third neutral point 51-3. The first neutral point 51-1, the second neutral point 51-2, and the third neutral point 51-3 are electrically insulated from each other.

The first U-phase coil 46-U1 has one end electrically connected to the first neutral point 51-1 via the first U-phase neutral wire 47-U1, and the other end electrically connected to the U-phase power supply via the first U-phase power supply wire 48-U1. The second U-phase coil 46-U2 has one end electrically connected to the second neutral point 51-2 via the second U-phase neutral wire 47-U2, and the other end electrically connected to the U-phase power supply via the second U-phase power supply wire 48-U2. The third U-phase coil 46-U3 has one end electrically connected to the third neutral point 51-3 via the third U-phase neutral wire 47-U3, and the other end electrically connected to the U-phase power supply via the third U-phase power supply wire 48-U3.

The first V-phase coil 46-V1 has one end electrically connected to the third neutral point 51-3 via the first V-phase neutral wire 47-V1, and the other end electrically connected to the V-phase power supply via the first V-phase power supply wire 48-V1. The second V-phase coil 46-V2 has one end electrically connected to the first neutral point 51-1 via the second V-phase neutral wire 47-V2, and the other end electrically connected to the V-phase power supply via the second V-phase power supply wire 48-V2. The third V-phase coil 46-V3 has one end electrically connected to the second neutral point 51-2 via the third V-phase neutral wire 47-V3, and the other end electrically connected to the V-phase power supply via the third V-phase power supply wire 48-V3.

The first W-phase coil 46-W1 has one end electrically connected to the second neutral point 51-2 via the first W-phase neutral wire 47-W1, and the other end electrically connected to the W-phase power supply via the first W-phase power line 48-W1. The second W-phase coil 46-W2 has one end electrically connected to the third neutral point 51-3 via the second W-phase neutral wire 47-W2, and the other end electrically connected to the W-phase power supply via the second W-phase power line 48-W2. The third W-phase coil 46-W3 has one end electrically connected to the first neutral point 51-1 via the third W-phase neutral wire 47-W3, and the other end electrically connected to the W-phase power supply via the third W-phase power line 48-W3.

(Method of manufacturing the stator)
The stator 22 is manufactured by appropriately winding a plurality of conductors (electric wires) 45, that is, a U-phase electric wire, a V-phase electric wire, and a W-phase electric wire, on the stator core 23 to which the upper insulator 24 and the lower insulator 25 are appropriately attached, using a winding machine. The conductors (electric wires) 45 are, for example, enameled wires (electric wires in which a copper wire is covered with an enamel coating). The winding machine includes, for example, a nozzle for a U-phase electric wire, a nozzle for a V-phase electric wire, and a nozzle for a W-phase electric wire. The nozzle for the U-phase electric wire, the nozzle for the V-phase electric wire, and the nozzle for the W-phase electric wire are fixed to each other. The nozzle for the U-phase electric wire can be moved appropriately to wind the U-phase electric wire in a predetermined winding manner around the stator core 23. The nozzle for the V-phase electric wire can be moved appropriately to wind the V-phase electric wire in a predetermined winding manner around the stator core 23. By appropriately moving the W-phase wire nozzle, the W-phase wire can be wound in a predetermined manner around the stator core 23. The winding machine is not limited to the configuration of this embodiment, and a winding machine having only one nozzle may be used.

First, the upper insulator 24, the lower insulator 25, and the stator core 23 to which an insulating film (not shown) is appropriately attached are set in the winding machine. The winding machine appropriately moves the U-phase wire nozzle to place one end of the U-phase wire on the lead side of the first stator core teeth portion 32-1, and passes the U-phase wire along the second direction side of the first stator core teeth portion 32-1 through one of the multiple slits 44. Next, the winding machine appropriately moves the U-phase wire nozzle to place the U-phase wire along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25, thereby forming the first U-phase crossover portion 49-U1 from the U-phase wire. The winding machine further appropriately moves the U-phase wire nozzle to place the U-phase wire between one of the multiple slits 44 and the fourth stator core teeth portion 32-4, thereby forming the first U-phase power line 48-U1 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form the first V-phase power line 48-V1 from the V-phase wire and the first W-phase power line 48-W1 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to wind the U-phase wire counterclockwise around the fourth stator core teeth 32-4, thereby forming the first U-phase coil 46-U1 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the V-phase wire counterclockwise around the eighth stator core teeth 32-8, thereby forming the first V-phase coil 46-V1 from the V-phase wire. The winding machine moves the W-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the W-phase wire counterclockwise around the sixth stator core teeth 32-6, thereby forming the first W-phase coil 46-W1 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to position the U-phase wire between the first direction side of the fourth stator core teeth portion 32-4 and the lead side of the fourth stator core teeth portion 32-4, thereby forming the first U-phase neutral conductor 47-U1 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form the first V-phase neutral conductor 47-V1 from the V-phase wire and the first W-phase neutral conductor 47-W1 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to position the U-phase wire between the lead side of the seventh stator core teeth portion 32-7 and the first direction side of the seventh stator core teeth portion 32-7, thereby forming the second U-phase neutral conductor 47-U2 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form the second V-phase neutral conductor 47-V2 from the V-phase wire and the second W-phase neutral conductor 47-W2 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to wind the U-phase wire clockwise around the seventh stator core teeth 32-7, thereby forming the second U-phase coil 46-U2 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the V-phase wire clockwise around the second stator core teeth 32-2, thereby forming the second V-phase coil 46-V2 from the V-phase wire. The winding machine moves the W-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the W-phase wire clockwise around the ninth stator core teeth 32-9, thereby forming the second W-phase coil 46-W2 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to pass the U-phase wire through one of the slits 44 and align it with the outer peripheral surface of the outer peripheral wall portion 41, thereby forming a second U-phase crossover portion 49-U2 from the U-phase wire. The winding machine further moves the U-phase wire nozzle appropriately to pass the U-phase wire through one of the slits 44 and place it on the lead side of the first stator core teeth portion 32-1, thereby forming a second U-phase power supply line 48-U2 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form a second V-phase power supply line 48-V2 from the V-phase wire and a second W-phase power supply line 48-W2 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to position the U-phase wire between the lead side of the first stator core teeth portion 32-1 and the second direction side of the first stator core teeth portion 32-1, thereby forming the third U-phase power supply wire 48-U3 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form the third V-phase power supply wire 48-V3 from the V-phase wire and the third W-phase power supply wire 48-W3 from the W-phase wire. In addition, a first connection terminal 50-1 is connected to one end of the bundle of multiple U-phase power lines 48-U1 to 48-U3, a second connection terminal 50-2 is connected to one end of the bundle of multiple V-phase power lines 48-V1 to 48-V3, and a third connection terminal 50-3 is connected to one end of the bundle of multiple W-phase power lines 48-W1 to 48-W3 (see FIG. 2).

The winding machine then moves the U-phase wire nozzle appropriately to wind the U-phase wire counterclockwise around the first stator core teeth 32-1, thereby forming the third U-phase coil 46-U3 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the V-phase wire counterclockwise around the fifth stator core teeth 32-5, thereby forming the third V-phase coil 46-V3 from the V-phase wire. The winding machine moves the W-phase wire nozzle in synchronization with the U-phase wire nozzle to wind the W-phase wire counterclockwise around the third stator core teeth 32-3, thereby forming the third W-phase coil 46-W3 from the W-phase wire.

The winding machine then moves the U-phase wire nozzle appropriately to position the U-phase wire between the first direction side of the first stator core teeth portion 32-1 and the lead side of the first stator core teeth portion 32-1, thereby forming the third U-phase neutral conductor 47-U3 from the U-phase wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle to form the third V-phase neutral conductor 47-V3 from the V-phase wire and the third W-phase neutral conductor 47-W3 from the W-phase wire.

By winding as described above, the third U-phase coil 46-U3 has both the start and end windings on the lead side, as shown in FIG. 6 and FIG. 7. On the other hand, the first U-phase coil 46-U1 and the second U-phase coil 46-U2 start winding from the anti-lead side and end winding on the lead side. Therefore, the number of turns wound around the third U-phase coil 46-U3 is different from the number of turns wound around the first U-phase coil 46-U1, and different from the number of turns wound around the second U-phase coil 46-U2. In addition, the first U-phase coil 46-U1 and the second U-phase coil 46-U2 have different lengths of the U-phase power supply line connected to the U-phase power supply. In other words, the first U-phase coil 46-U1 to the third U-phase coil 46-U3 have different winding methods, including the number of turns of the coil 46 and the length of the power supply line. Therefore, the length of the wire from the neutral point 51-1 to the U-phase power line is different for the first U-phase coil 46-U1, the second U-phase coil 46-U2, and the third U-phase coil 46-U3, and the impedance is also different.

The first U-phase neutral conductor 47-U1 and the second U-phase neutral conductor 47-U2 are disconnected, the first V-phase neutral conductor 47-V1 and the second V-phase neutral conductor 47-V2 are disconnected, and the first W-phase neutral conductor 47-W1 and the second W-phase neutral conductor 47-W2 are disconnected. An end of the first U-phase neutral conductor 47-U1, an end of the second V-phase neutral conductor 47-V2, and an end of the third W-phase neutral conductor 47-W3 are electrically connected by a connector that can electrically connect multiple conductors 45 without stripping the coating of the neutral conductor 47. A splice terminal 52 is used as the connector.

In this embodiment, the end of the first U-phase neutral wire 47-U1, the end of the second V-phase neutral wire 47-V2, and the end of the third W-phase neutral wire 47-W3 are joined to each other by crimping via the first splice terminal 52-1 and electrically connected to each other, forming the first neutral point 51-1. The three neutral wires 47 are stably bundled in a state of contact with each other. The first splice terminal 52-1 can join the three neutral wires 47 to each other by crimping so as to wrap around the bundled neutral wires 47, thereby electrically connecting them to each other. By crimping the group of neutral wires 47 with the first splice terminal 52-1, the coating film of the electric wire that is each neutral wire 47 is peeled off by the uneven portion of the first splice terminal 52-1, and the three neutral wires 47 are joined.

Similarly, the end of the second U-phase neutral conductor 47-U2, the end of the third V-phase neutral conductor 47-V3, and the end of the first W-phase neutral conductor 47-W1 are joined to each other by crimping via the second splice terminal 52-2 and electrically connected to each other, forming the second neutral point 51-2. The end of the third U-phase neutral conductor 47-U3, the end of the first V-phase neutral conductor 47-V1, and the end of the second W-phase neutral conductor 47-W2 are joined to each other by crimping via the third splice terminal 52-3 and electrically connected to each other, forming the third neutral point 51-3. This makes it possible to easily form the first neutral point 51-1, the second neutral point 51-2, and the third neutral point 51-3.

The first splice terminal 52-1 forming the neutral point 51 is covered with an insulating tube 58, and then, as shown in FIG. 2, the insulating tube 58 is inserted and held in the gap G between adjacent winding portions 46. Similarly, the second splice terminals 52-2 and the third splice terminals 52-3 forming the neutral point 51 are each covered with an insulating tube 58, and then, each insulating tube 58 is inserted and held in the gap G between adjacent winding portions 46.

(Operation of the compressor)
The compressor 1 is provided as a component of a refrigeration cycle device (not shown) and is used to compress a refrigerant and circulate the refrigerant in a refrigerant circuit of the refrigeration cycle device. The three-phase motor 6 generates a rotating magnetic field by applying a three-phase voltage to a plurality of U-phase power lines 48-U1 to 48-U3, a plurality of V-phase power lines 48-V1 to 48-V3, and a plurality of W-phase power lines 48-W1 to 48-W3. The rotor 21 rotates due to the rotating magnetic field generated by the stator 22. The three-phase motor 6 rotates the shaft 3 by the rotation of the rotor 21.

When the shaft 3 rotates, the compression section 5 draws in low-pressure refrigerant gas through the suction pipe 11, compresses the drawn low-pressure refrigerant gas to generate high-pressure refrigerant gas, and supplies the high-pressure refrigerant gas to the upper muffler chamber 16 and the lower muffler chamber 17. The lower muffler cover 15 reduces the pressure pulsation of the high-pressure refrigerant gas supplied to the lower muffler chamber 17, and supplies the high-pressure refrigerant gas with reduced pressure pulsation to the upper muffler chamber 16. The upper muffler cover 14 reduces the pressure pulsation of the high-pressure refrigerant gas supplied to the upper muffler chamber 16, and supplies the high-pressure refrigerant gas with reduced pressure pulsation to the space between the compression section 5 and the three-phase motor 6 in the internal space 7 through the compressed refrigerant discharge hole 18.

The high-pressure refrigerant gas supplied to the space between the compression section 5 and the three-phase motor 6 in the internal space 7 passes through a gap formed in the three-phase motor 6 and is supplied to the space above the three-phase motor 6 in the internal space 7. The refrigerant supplied to the space above the three-phase motor 6 in the internal space 7 is discharged through the discharge pipe 12 to a device arranged downstream of the compressor 1 in the refrigeration cycle device.

(Characteristic configuration of the embodiment)
Next, a description will be given of a characteristic configuration of the three-phase motor 6 in the embodiment. The characteristics of the three-phase motor 6 in the embodiment include an inter-coil insulator 27 (described later) provided between the winding portions (coils) 46 of the stator 22, as shown in Fig. 2. A neutral conductor 47 drawn out from the winding portion 46 is passed inside the inter-coil insulator 27, so that the movement of the inter-coil insulator 27 in the radial direction and the circumferential direction of the stator 22 is restricted by the neutral conductor 47.

(Neutral wire pulled out)
First, the neutral wires 47 drawn from the winding portion 46 of the stator 22 will be described with reference to Figs. 5, 6, and 8. Fig. 8 is a plan view showing the state in which the neutral wires 47 are drawn from the stator 22 in the embodiment. The first to ninth winding portions 46 shown in Fig. 6 correspond to the first to ninth winding portions 46 arranged clockwise in Fig. 5. In Fig. 6, the end portion (marked with a circle) at the start of winding of the conductor 45 extended to the winding portion (coil) 46 and the middle portion (marked with a circle) of the conductor 45 wound around the winding portion 46 are connected to the power supply line 48 described above.

As shown in FIG. 6, the conductor 45 forming each of the winding sections 46 No. 1, 3, 4, 5, 6, and 8 is wound around the stator core teeth 32 in the direction of the arrow in FIG. 6, and the end of the winding (△ mark) is extended to the lead side (upper insulator 24 side) so that it is pulled out from the outer periphery of each winding section 46 to the outside of the upper insulator 24 as shown in FIG. 8. In other words, the third U-phase neutral wire 47-U3 pulled out from the first winding section 46 is pulled out from the outside of the gap G in the radial direction of the stator 22 near the gap G between adjacent winding sections 46 and extended to the outer periphery of the upper insulator 24.

Similar to the third U-phase neutral conductor 47-U3, as shown in Figures 6 and 8, the third W-phase neutral conductor 47-W3 drawn from the third winding section 46, the first U-phase neutral conductor 47-U1 drawn from the fourth winding section 46, the third V-phase neutral conductor 47-V3 drawn from the fifth winding section 46, the first W-phase neutral conductor 47-W1 drawn from the sixth winding section 46, and the first V-phase neutral conductor 47-V1 drawn from the eighth winding section 46 are all drawn from the outside of the gap G in the radial direction of the stator 22 near the gap G between adjacent winding sections 46 and extended to the outer periphery of the upper insulator 24.

On the other hand, as shown in FIG. 6, the conductor 45 forming each of the second, seventh, and ninth winding sections 46 is wound around the stator core teeth section 32 in the direction of the arrow in FIG. 6 from the winding start end (△ mark) extended toward the lead side, and is therefore pulled out from the center side of each winding section 46 to the outside of the upper insulator 24 as shown in FIG. 8. In other words, the second V-phase neutral wire 47-V2 pulled out from the second winding section 46 is extended from a position away from the gap G between adjacent winding sections 46 to the outer periphery of the upper insulator 24.

Similar to the second V-phase neutral conductor 47-V2, as shown in Figures 6 and 8, the second U-phase neutral conductor 47-U2 drawn from the seventh winding section 46 and the second W-phase neutral conductor 47-W2 drawn from the ninth winding section 46 are extended from a position away from the gap G between adjacent winding sections 46 to the outer periphery of the upper insulator 24.

As described above, of the nine neutral wires 47 drawn out from each of the nine winding sections 46 toward the upper insulator 24, six neutral wires 47 drawn out from the ends of the winding sections 46 on the winding end side of the first, third, fourth, fifth, sixth, and eighth winding sections 46 are passed through the gaps G between adjacent winding sections 46. Therefore, in this embodiment, the movement of the inter-coil insulator 27 is restricted by using these six neutral wires 47.

In other words, the neutral conductor 47 drawn from each of the winding parts 46 No. 2, 7, and 9 toward the upper insulator 24 is drawn from a position toward the center of the winding part 46, away from the gap G, making it difficult to route it through the inter-coil insulator 27 placed in the gap G and unsuitable for use in regulating the inter-coil insulator 27. Therefore, of the nine gaps G between adjacent winding parts 46, the inter-coil insulator 27 is placed in six of the gaps G, and insulating tubes 58 covering each neutral point 51 are inserted and held in the remaining three gaps G.

(Slot insulator installed)
Here, a description will be given of the slot insulator 26 disposed between the winding portions 46 adjacent to each other in the circumferential direction of the stator 22. Fig. 9 is an enlarged plan view showing the slot insulator 26 provided in the stator 22 in the embodiment.

As shown in FIG. 9, the slot insulator 26 is disposed between adjacent stator core teeth 32 in the circumferential direction of the stator 22. The slot insulator 26 provided in the stator 22 has each end 26a located on the radially inner side of the stator 22 bent toward the radially outer side of the stator 22, and extends along the radial direction of the stator 22 so as not to protrude in the circumferential direction of the stator 22 within the gap G between adjacent winding portions 46. Therefore, in the circumferential direction of the stator 22, the spacing between each end 26a of the slot insulator 26 is kept approximately constant, and the ends 26a are not bent to narrow the spacing between them.

In addition, each end 26a of the slot insulator 26 is engaged with a guide groove (not shown) formed on the inner circumferential side of the insulator teeth portion 42, and the movement of each end 26a is restricted. Note that each end 26a of the slot insulator 26 is not limited to a structure extending along the radial direction of the stator 22, and may be bent at an acute angle toward the center of the winding portion 46 in the circumferential direction of the stator 22 as long as it does not protrude inside the gap G in the circumferential direction of the stator 22.

As described above, each end 26a of the slot insulator 26 does not protrude into the gap G in the circumferential direction of the stator 22, so that the nozzle that supplies the conductor 45 is prevented from coming into contact with each end 26a during the winding process in which the conductor 45 is wound using a winding machine. This makes it possible to prevent damage to the slot insulator 26 due to contact with the nozzle. In addition, each end 26a of the slot insulator 26 does not interfere with the winding operation of the nozzle, and the wound portion 46 can be formed smoothly.

When the conductor 45 is wound around the stator core teeth 32 to form the winding portion 46, the slot insulator 26 is pressed against each of the stator core teeth 32 adjacent in the circumferential direction of the stator 22 by the conductor 45, generating tension in the slot insulator 26 in the circumferential direction of the stator 22. This tension causes the central portion 26b of the slot insulator 26, which faces the gap G between the adjacent winding portions 46, to be stretched tightly in the circumferential direction of the stator 22.

By tensioning the central portion 26b of the slot insulator 26 in this way, when the inter-coil insulator 27 is inserted into the gap G between adjacent winding portions 46, the hook portion 29 (see FIG. 14), described later, of the inter-coil insulator 27 smoothly hooks onto the central portion 26b. This restricts the movement of the inter-coil insulator 27 inserted into the gap G, and the slot insulator 26 positions the inter-coil insulator 27 relative to the axial direction of the stator 22 (axial direction of the rotor 21).

(Structure of inter-coil insulation)
Fig. 10 is a plan view showing inter-coil insulators 27 provided in stator 22 in the embodiment. Fig. 11 is an enlarged plan view showing inter-coil insulators 27 in the embodiment.

As shown in Figures 10 and 11, the stator 22 has an inter-coil insulator 27 that electrically insulates adjacent winding sections (coils) 46 of different phases in the circumferential direction of the stator 22. The inter-coil insulator 27 is disposed between adjacent winding sections 46 in the circumferential direction of the stator 22, that is, in the gap G where the winding sections 46 face each other.

The inter-coil insulator 27 is formed by molding an insulating material such as a resin, for example, polybutylene terephthalate (PBT), into a thin plate (film). When the inter-coil insulator 27 is held between the winding parts (coils) 46 adjacent to each other in the circumferential direction of the stator 22, the thin plate is folded along the axial direction of the stator 22 and folded in three to form a Z-shape. The inter-coil insulator 27 has a bent part 27a that extends radially outward of the stator 22, turns back on the outside, and extends radially inward of the stator 22, and a bent part 27b that extends radially inward from the bent part 27a, turns back on the inside, and extends radially outward of the stator 22. As shown in FIG. 11, each bent part 27a, 27b is formed, for example, in a U-shaped cross section, but may also be formed in a V-shaped cross section. The inter-coil insulator 27 is described in more detail below, but it is preferable that it has a structure with at least two bent portions 27a and 27b.

11, the inter-coil insulator 27 has a bent portion 27a that extends radially outward of the stator 22, turns back on the outer side, and extends radially inward of the stator 22, and a neutral conductor 47 is passed inside the bent portion 27a. The neutral conductor 47 passed inside the bent portion 27a of the inter-coil insulator 27 contacts the inner surface of the bent portion 27a to restrict the movement of the inter-coil insulator 27, thereby restricting the movement of the inter-coil insulator 27 in the radial and axial directions of the stator 22. In particular, the neutral conductor 47 passed inside the inter-coil insulator 27 is drawn out to the outer periphery of the upper insulator 24, stretched along the outer periphery of the upper insulator 24, and wound around and fixed to the outer periphery of the outer periphery wall portion 41 of the upper insulator 24. Therefore, the neutral wire 47, which is pulled radially outward of the stator 22, presses the inter-coil insulator 27 against the inside of the yoke portion 31 toward the radially outward of the stator 22, further restricting the movement of the inter-coil insulator 27 within the gap G.

In addition, an elastic force is generated in the inter-coil insulator 27 folded in a Z-shape, tending to expand in the circumferential direction of the stator 22. This elastic force presses the inter-coil insulator 27 against the outer circumferential surface of each winding portion 46 within the gap G, so that the inter-coil insulator 27 is sandwiched and held between each winding portion 46. This elastic force also restricts the movement of the inter-coil insulator 27 within the gap G.

The inter-coil insulator 27 is formed by bending a thin plate with a thickness of about 0.25 mm, so that the inner spacing of the bent portion 27a, which has a U-shaped cross section, is about 1 mm, and a neutral conductor 47 with a wire diameter of about 0.55 mm to 0.85 mm is passed through the inner side of the bent portion 27a.

In the present embodiment, the neutral conductor 47 is passed through the inside of one of the bent portions 27a in the inter-coil insulator 27, but this structure is not limited to this. If the inter-coil insulator 27 is arranged so that the bent portion 27b is located radially outward of the stator 22 (close to the inner peripheral surface of the yoke portion 31), the neutral conductor 47 may be passed through the inside of the other bent portion 27b, and the same effect as described above can be obtained by changing the orientation of the inter-coil insulator 27 arranged in the gap G between adjacent winding portions 46.

Figure 12 is a perspective view illustrating the state in which the inter-coil insulation 27 in the embodiment is folded. Figure 13 is a plan view showing the folded state of the inter-coil insulation 27 in the embodiment. Figure 14 is a side view showing the inter-coil insulation 27 in the embodiment. Figure 15 is an enlarged perspective view showing the groove of the inter-coil insulation 27 in the embodiment.

As shown in FIG. 12, the bent portion 27a of the inter-coil insulator 27 has grooves 28 formed at both ends in the axial direction of the stator 22, into which the neutral conductor 47 passing through the inside of the inter-coil insulator 27 enters. By passing the neutral conductor 47 through the groove 28 of the inter-coil insulator 27, the neutral conductor 47 passing through the inside of the bent portion 27a of the inter-coil insulator 27 can be easily positioned with respect to the bent portion 27a. This improves the ease of operation when routing the neutral conductor 47 passing through the inside of the bent portion 27a along the outer circumferential surface of the outer circumferential wall portion 41 of the upper insulator 24.

In addition, the neutral wire 47 passed inside the inter-coil insulator 27 has both sides in the axial direction of the stator 22 entering into each groove 28, so that the neutral wire 47 draws the inter-coil insulator 27 to the outer peripheral surface of the winding portion 46, enhancing adhesion between the neutral wire 47 and the outer peripheral surface of the winding portion 46. This, for example, prevents the inter-coil insulator 27 from floating up from within the gap G toward the upper insulator 24, enhancing the stability of the state in which the inter-coil insulator 27 is regulated by the neutral wire 47.

Furthermore, by forming the groove 28 in the bent portion 27a, the neutral conductor 47 entering the groove 28 is disposed in the bent portion 27a located radially outward of the stator 22 (close to the inner peripheral surface of the yoke portion 31), so that the bent portion 27a is pressed toward the inside of the yoke portion 31 in the axial direction of the stator 22 by the neutral conductor 47. This further enhances the stability of the state in which the inter-coil insulator 27 is regulated by the neutral conductor 47.

As shown in Figs. 12, 14 and 15, the inter-coil insulator 27 is formed with a hook-shaped catch 29 as an engagement part that engages with the central part 26b of the slot insulator 26 on the upper insulator 24 side in the axial direction of the stator 22. The catch 29 is formed on the end 27c of a thin plate that is folded in three in the circumferential direction of the stator 22. That is, the inter-coil insulator 27 includes a bent part 27a that is bent so as to be convex toward the outside in the radial direction of the stator 22, through which the neutral wire 47 passes, and a bent part 27b that is bent so as to be convex toward the inside in the radial direction of the stator 22, so that the end 27c on which the catch 29 is formed faces the outer diameter side.

The inter-coil insulator 27 is easily positioned in the axial direction of the stator 22 by the hook portion 29 hooking onto the slot insulator 26. By positioning the inter-coil insulator 27 using the slot insulator 26 in this way, the structure of the molding die for molding the upper insulator 24 can be prevented from becoming complicated, and an increase in manufacturing costs can be suppressed, compared to when, for example, a recess or the like for hooking the inter-coil insulator 27 is formed in the upper insulator 24.

The hook portion 29 of the inter-coil insulator 27 is not limited to being hooked onto the slot insulator 26, but may be hooked onto the insulator (upper insulator 24). In this case, for example, by hooking the hook portion 29 of the inter-coil insulator 27 onto a recess (slit 44) of the insulator, the inter-coil insulator 27 can be easily positioned with respect to the axial direction of the stator 22.

In addition, the hook portion 29 is formed in a shape that includes a recess that is recessed toward the bent portion 27b side from the end portion 27c, which prevents the outer shape of the hook portion 29 from being deformed during press processing, allowing the hook portion 29 to be formed stably.

The inter-coil insulator 27 also has chamfered portions 30, which are formed by chamfering the corners of the outer periphery disposed at the radial ends of the stator 22. The chamfered portions 30 are formed at the corners of the lower insulator 25 at the ends 27c, 27d of the thin plate folded in three in the circumferential direction of the stator 22. This prevents the inter-coil insulator 27 from getting caught on the winding portions 46 when the inter-coil insulator 27 is inserted into the gap G between the adjacent winding portions 46, so that the inter-coil insulator 27 can be smoothly inserted and attached into the gap G. Note that, in this embodiment, the chamfered portion 30 is illustrated as having a linearly chamfered corner, but the corners may be rounded by R-chamfering.

(Inter-coil insulation installed)
Fig. 16 is a side view showing a state in which the inter-coil insulator 27 in the embodiment is attached to the stator 22. When attaching the inter-coil insulator 27 to the stator 22, as shown in Fig. 11, the neutral conductor 47 is passed through the inside of the inter-coil insulator 27, and the inter-coil insulator 27 is attached to the stator 22 with the neutral conductor 47 passed through. As shown in Figs. 11 and 16, the inter-coil insulator 27 is inserted into the gap G between adjacent winding portions 46 from the upper insulator 24 side toward the stator 22. When the inter-coil insulator 27 is inserted into the gap G, the hook portion 29 of the inter-coil insulator 27 hooks onto the central portion 26b of the slot insulator 26 located in the gap G, so that the inter-coil insulator 27 is easily positioned in the axial direction of the stator 22. In this manner, the inter-coil insulator 27 inserted into the gap G between adjacent winding portions 46 is positioned relative to the axial direction of the stator 22, thereby reducing variation in the mounting position of the inter-coil insulator 27 relative to the axial direction of the stator 22.

The inter-coil insulator 27 extends straight from the opening on the end 27d side to the bent portion 27a, so when passing the neutral conductor 47 through to the inside of the bent portion 27a, the neutral conductor 47 can be easily inserted through the opening on the end 27d side to the inside of the bent portion 27a.

In the above description, the neutral conductor 47 is arranged to pass through the inside of the bent portion 27a in the intercoil insulator 27, but the present invention is not limited to this handling. The neutral conductor 47 may be arranged to pass through the inside of the bent portion 27b, and the bent portion 27b may be arranged in the gap G in the opposite direction (S-shaped cross section) to the direction shown in FIG. 11 so as to be positioned radially outward of the stator 22 (close to the inner peripheral surface of the yoke portion 31), so that the intercoil insulator 27 can be used in the same manner as described above. In this case, the intercoil insulator 27 has a bent portion 27b that extends radially outward of the stator 22, turns back on the outside, and extends radially inward of the stator 22, and the position of the intercoil insulator 27 is regulated by the neutral conductor 47 that is passed through the inside of the bent portion 27b. Therefore, the intercoil insulator 27 has a high degree of freedom in handling when passing the neutral conductor 47 inside the intercoil insulator 27.

The shape and folded state of the inter-coil insulator 27 are not limited to the Z-shaped (S-shaped) cross section inter-coil insulator 27 described above, and other shapes are acceptable as long as the neutral conductor 47 can be passed inside. Modified examples of the inter-coil insulator 27 will be described below. In the modified inter-coil insulator, the same parts as the inter-coil insulator 27 described above are designated by the same reference numerals as the inter-coil insulator 27, and description thereof will be omitted.

(Modification 1 of Inter-coil Insulation)
Fig. 17 is a plan view showing an inter-coil insulation of Modification 1. Fig. 18 is a perspective view for explaining a state in which the inter-coil insulation of Modification 1 is folded. Fig. 19 is a plan view showing the folded state of the inter-coil insulation of Modification 1.

As shown in Figures 17, 18, and 19, the inter-coil insulator 27-1 of Modification 1 is formed by bending a thin plate in the circumferential direction of the stator 22, and is folded in a so-called triple-fold manner, which differs from the inter-coil insulator 27 that is folded into a Z-shaped cross section. As shown in Figure 19, the inter-coil insulator 27-1 of Modification 1 is folded into an e-shaped cross section so that the end 27d is located inside the bent portion 27b.

17, in the inter-coil insulator 27-1 of the first modification, the inter-coil insulator 27-1 is inserted into the gap G so that the bent portion 27a is positioned radially outward of the stator 22, and similarly to the inter-coil insulator 27 described above, the neutral wire 47 can restrict movement of the inter-coil insulator 27-1 in the radial and axial directions of the stator 22. That is, the inter-coil insulator 27-1 has a bent portion 27a that extends radially outward of the stator 22, turns back on this outer side, and extends radially inward of the stator 22, and the position of the inter-coil insulator 27-1 can be restricted in the radial direction of the stator 22 by the neutral wire 47 that is passed inside the bent portion 27a. Furthermore, the inter-coil insulator 27-1 includes a bent portion 27b that faces the end portion 27c on which the hook portion 29 is formed toward the outer diameter side, so that the hook portion 29 can be easily hooked onto the slot insulator 26 or the upper insulator 24 to regulate the position of the inter-coil insulator 27-1 in the axial direction of the stator 22. Furthermore, because the neutral wire 47 is wound and fixed around the outer circumferential surface of the upper insulator 24, the inter-coil insulator 27-1 is pressed against the stator 22 toward the radially outward direction of the stator 22 by the neutral wire 47, which further regulates the movement of the inter-coil insulator 27-1 within the gap G.

(Modifications 2 and 3 of Inter-coil Insulation)
FIG. 20 is a side view showing an inter-coil insulator of Modification 2. FIG. 21 is a side view showing an inter-coil insulator of Modification 3. The inter-coil insulators of Modifications 2 and 3 differ from the inter-coil insulator 27 described above in the shape of the hook portion that is hooked onto the slot insulator 26. As shown in FIG. 20, the hook portion 29-1 of the inter-coil insulator 27-2 of Modification 2 is formed into a hook shape that is cut from the end portion 27c in a direction inclined with respect to the axial direction of the stator 22 and recessed toward the bent portion 27b. Similarly, as shown in FIG. 21, the hook portion 29-2 of the inter-coil insulator 27-3 of Modification 3 is formed into a hook shape that does not include a recess recessed toward the bent portion 27b from the end portion 27c. Even such hook portions 29-1 and 29-2 can be hooked onto the slot insulator 26, and are not limited to the shape of the hook portion 29 shown in FIG. 14.

(Effects of the embodiment)
As described above, the three-phase motor 6 of the embodiment has the inter-coil insulator 27 disposed in the gap G between the winding portions 46 adjacent to each other in the circumferential direction of the stator 22 to insulate the winding portions 46 from each other. The inter-coil insulator 27 has a bent portion 27a that extends radially outward of the stator 22, turns back at this outer side, and extends radially inward of the stator 22, and movement of the inter-coil insulator 27 is restricted by the neutral conductor 47 that is passed inside the bent portion 27a. In this manner, the neutral conductor 47 drawn out to the upper insulator 24 side is used as a movement restricting means that restricts movement of the inter-coil insulator 27. Therefore, movement of the inter-coil insulator 27 in the radial and axial directions of the stator 22 can be restricted by the neutral conductor 47. This prevents the inter-coil insulator 27 disposed in the gap G between adjacent winding portions 46 from slipping out of the gap G or from shifting position, thereby improving the stability of the insulating state between adjacent winding portions 46 and the stability of the rotational operation of the rotor 21. Meanwhile, since the neutral conductor 47 formed after the winding process is used as a means for restricting movement of the inter-coil insulator 27, the winding operation of the nozzle in the winding process to form each winding portion 46 is not hindered by the movement restricting means.

The neutral conductor 47 in the three-phase motor 6 of the embodiment is passed through the inside of the bent portion 27a along the axial direction of the stator 22 and is wound and fixed around the outer peripheral surface of the upper insulator 24. As a result, the neutral conductor 47 is pulled radially outward of the stator 22, and the inter-coil insulator 27 is pressed against the stator 22 toward the radially outward direction of the stator 22, thereby restricting the movement of the inter-coil insulator 27 within the gap G.

The stator 22 of the three-phase motor 6 of the embodiment has a slot insulator 26 arranged between adjacent stator core teeth 32 in the circumferential direction of the stator 22, and the inter-coil insulator 27 has a hook portion 29 that can be hooked to the center portion 26b of the slot insulator 26 or the slit 44 of the insulator (upper insulator 24). As a result, when the inter-coil insulator 27 is inserted into the gap G between adjacent winding portions 46, the hook portion 29 can be hooked into the center portion 26b of the slot insulator 26 or the slit 44 of the insulator, thereby positioning the inter-coil insulator 27 in the axial direction of the stator 22. By positioning the inter-coil insulator 27 inserted into the gap G in this way in the axial direction of the stator 22, it is possible to suppress variation in the mounting position of the inter-coil insulator 27 in the axial direction of the stator 22. In particular, when the hook portion 29 of the inter-coil insulator 27 is hooked onto the slot insulator 26, the inter-coil insulator 27 is positioned by the slot insulator 26, which reduces the increase in manufacturing costs compared to, for example, forming a recess (slit 44) in the upper insulator 24 to position the inter-coil insulator 27.

In addition, the inter-coil insulator 27 of the three-phase motor 6 of the embodiment has grooves 28 formed at both ends in the axial direction of the stator 22, into which the neutral wire 47 passed inside the bent portion 27a is hooked. By passing the neutral wire 47 through the grooves 28 of the inter-coil insulator 27, the neutral wire 47 passed inside the bent portion 27a of the inter-coil insulator 27 can be easily positioned with respect to the bent portion 27a, improving the workability when routing the neutral wire 47 along the outer circumferential surface of the upper insulator 24. In addition, the neutral wire 47 passed inside the inter-coil insulator 27 has both sides of the neutral wire 47 in the axial direction of the stator 22 enter into the grooves 28, so that the neutral wire 47 draws the inter-coil insulator 27 to the outer circumferential surface of the winding portion 46, improving the adhesion between the neutral wire 47 and the outer circumferential surface of the winding portion 46. This prevents the inter-coil insulator 27 from floating up toward the upper insulator 24, for example, and increases the stability of the state in which the neutral conductor 47 regulates the inter-coil insulator 27.

In the three-phase motor 6 of the embodiment, the groove 28 of the inter-coil insulator 27 is formed in the bent portion 47a. As a result, the neutral conductor 47 that enters the groove 28 is disposed inside the bent portion 27a that is located on the outer side in the radial direction of the stator 22 (close to the inner peripheral surface of the yoke portion 31), and the bent portion 27a is pressed toward the inside of the yoke portion 31 in the axial direction of the stator 22 by the neutral conductor 47. This further enhances the stability of the state in which the inter-coil insulator 27 is regulated by the neutral conductor 47.

The slot insulator 26 of the three-phase motor 6 of the embodiment has an end 26a located on the radial inside of the stator 22, which is bent toward the radial outside of the stator 22 and extends along the radial direction of the stator 22. This prevents the nozzle from coming into contact with the end 26a of the slot insulator 26 during the winding process of the conductor 45, and prevents the end 26a of the slot insulator 26 from wearing out or being damaged when the nozzle moves.

The inter-coil insulator 27 of the three-phase motor 6 of the embodiment has a chamfered portion 30 in which a corner of the outer periphery located at the radial end of the stator 22 is cut away. This prevents the inter-coil insulator 27 from getting caught on the winding portion 46 when the inter-coil insulator 27 is inserted into the gap G between adjacent winding portions 46, so that the inter-coil insulator 27 can be smoothly inserted and attached into the gap G.

1 Compressor 5 Compression section 6 Three-phase motor (electric motor)
21 rotor 22 stator 24 upper insulator (insulator)
25 Lower insulator (insulator)
26 Slot insulator 26a End 27 Inter-coil insulator 27a Bent portion 28 Groove 29 Hook portion (engagement portion)
30 Chamfered portion 32 (32-1 to 32-9) Stator core teeth portion (teeth)
45 Conductor (electric wire)
46 Winding section (coil)
46-U1 to 46-U3 U-phase coil 46-V1 to 46-V3 V-phase coil 46-W1 to 46-W3 W-phase coil 47 Neutral wire (movement restriction means)
47-U1 to 47-U3 U-phase neutral conductor 47-V1 to 47-V3 V-phase neutral conductor 47-W1 to 47-W3 W-phase neutral conductor G Gap

Claims (8)

a rotor and an annular stator that generates a magnetic field that rotates the rotor,
The stator includes:
A plurality of teeth arranged at intervals in a circumferential direction of the stator;
A plurality of winding portions formed by winding a conductor around each of the plurality of teeth, and a neutral wire connected to one end side of the conductor forming the winding portions;
an inter-coil insulator disposed in a gap between adjacent winding portions in the circumferential direction of the stator to insulate the winding portions from each other,
an electric motor, wherein the inter-coil insulator has a bent portion that extends radially outward of the stator, folds back at the outer side, and extends radially inward, and the radially inward movement of the inter-coil insulator is restricted by a neutral wire that is passed inside the bent portion. the stator has an insulator provided at an end of the stator,
The neutral conductor is passed through the inner side of the bent portion along the axial direction of the stator and fixed to the insulator.
2. The electric motor according to claim 1. the stator has slot insulators that insulate the teeth from the conductors wound around the teeth, the slot insulators being disposed between adjacent teeth in the circumferential direction of the stator,
The inter-coil insulator has an engagement portion that engages with the slot insulator.
3. The electric motor according to claim 1 or 2. The inter-coil insulator has a groove formed at each end in the axial direction of the stator, into which the neutral conductor passing through the inner side of the bent portion is hooked.
4. An electric motor according to claim 1. The groove of the inter-coil insulator is formed in the bent portion.
5. The electric motor according to claim 4. The slot insulator has an end portion located on the inside in the radial direction of the stator bent toward the outside in the radial direction and extended along the radial direction.
4. The electric motor according to claim 3. The inter-coil insulator has a chamfered portion in which a corner of an outer periphery of the inter-coil insulator is chamfered and disposed on the radially outer side of the stator.
7. An electric motor according to claim 1. A compression section that compresses a refrigerant;
A compressor comprising: the electric motor according to claim 1 , which drives the compression section.

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