JP2019176638A - Three-phase motor and compressor - Google Patents

Abstract

A plurality of windings are appropriately connected to a plurality of neutral points.
A plurality of U-phase windings 46-U1 to 46-U3 are electrically connected to a plurality of neutral points 51-1 to 51-3 via a plurality of U-phase neutral wires 47-U1 to 47-U3. Connected. The plurality of V-phase windings 46-V1 to 46-V3 are electrically connected to the plurality of neutral points 51-1 to 51-3 via the plurality of V-phase neutral wires 47-V1 to 47-V3. ing. The plurality of W-phase windings 46-W1 to 46-W3 are electrically connected to the plurality of neutral points 51-1 to 51-3 via the plurality of W-phase neutral wires 47-W1 to 47-W3. ing. 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 are a plurality of stator cores. The teeth are not routed to the opposite lead side farther from the plurality of neutral points 51-1 to 51-3 than the teeth portions 32-1 to 32-9 and are arranged on the lead side.
[Selection] Figure 5

Description

  The technology of the present disclosure relates to a three-phase motor and a compressor.

  A hermetic compressor in which a compressor unit and a motor unit are stored inside a hermetic container is known. The motor unit includes a rotor in which a permanent magnet is embedded and a stator that rotates the rotor by generating a rotating magnetic field, and transmits rotational power to the compressor unit via a shaft fixed to the rotor. The stator is formed with a plurality of teeth. An electric wire is wound around each tooth to form a winding. The windings are star-shaped, that is, each of the plurality of windings has one end connected to a power source and the other end connected to a neutral point (see Patent Documents 1 to 4).

JP 2001-275292 A JP 2002-10550 A JP 2007-110848 A Japanese Patent Laying-Open No. 2015-192553

  The motor portion may have a plurality of neutral points formed, for example, to facilitate manufacture. At this time, the inventor of the present application has found a problem that the current of the plurality of neutral points may be disrupted and noise may be generated due to different winding methods of the motor unit. It was.

  The disclosed technique has been made in view of such a point, and an object thereof is to provide a three-phase motor and a compressor in which a plurality of windings are appropriately connected to a plurality of neutral points.

  In the disclosed aspect, the three-phase motor is a three-phase motor including a rotor and a stator that generates a magnetic field that rotates the rotor, and the stator is wound around each of the plurality of teeth and the plurality of teeth. A plurality of windings having a neutral wire on one end side and a power supply line on the other end side, and a plurality of neutral points formed by electrically connecting the neutral wires The plurality of neutral wires are arranged on the lead side on which the power supply line is arranged so as to correspond to each of the plurality of teeth.

  The disclosed three-phase motor and compressor allow multiple windings to be properly connected to multiple neutral points.

FIG. 1 is a longitudinal sectional view showing a compressor provided with the three-phase motor of the embodiment. FIG. 2 is a bottom view showing the stator core. FIG. 3 is a perspective view showing the lower insulator. FIG. 4 is a bottom view showing the stator. FIG. 5 is a development view showing a plurality of windings. FIG. 6 is a connection diagram illustrating a connection state of a plurality of windings. FIG. 7 is a perspective view showing a state before connection of the first splice terminal and the electric wire. FIG. 8 is a developed view showing a plurality of windings of a conventional three-phase motor. FIG. 9 is a connection diagram illustrating a connection state of a plurality of windings of a conventional three-phase motor. FIG. 10 is a line graph showing sound pressure levels of noise generated in the three-phase motor of the example and the three-phase motors of Comparative Examples 1 to 3. FIG. 11 shows the sound pressure of the sound having a frequency of 270 Hz among noises generated in the three-phase motor of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 45 rps. It is a bar graph which shows a level. FIG. 12 shows the sound pressure of a sound having a frequency of 330 Hz among noises generated in the three-phase motor of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 55 rps. It is a bar graph which shows a level. FIG. 13 shows the sound pressure of the sound having a frequency of 360 Hz among noises generated in the three-phase motor of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 60 rps. It is a bar graph which shows a level.

  Hereinafter, a three-phase motor and a compressor according to embodiments disclosed in the present application will be described with reference to the drawings. In addition, the technique of this indication is not limited by the following description. Moreover, in the following description, the same code | symbol is provided to the same component and the overlapping description is abbreviate | omitted.

  FIG. 1 is a longitudinal sectional view showing a compressor 1 provided with a three-phase motor 6 according to an embodiment. As shown in FIG. 1, the compressor 1 includes a container 2, a shaft 3, a compressor unit 5, and a three-phase motor 6. The container 2 forms a sealed internal space 7. The internal space 7 is formed in a substantially cylindrical shape. The container 2 is formed so that the center axis of the cylinder of the internal space 7 is parallel to the vertical direction when placed vertically on a horizontal plane. In the container 2, an oil sump 8 is formed in the lower part of the internal space 7. The oil sump 8 stores refrigeration oil that lubricates the compressor unit 5. A suction pipe 11 that sucks refrigerant and a discharge pipe 12 that discharges compressed refrigerant are connected to the container 2. The shaft 3 is formed in a rod shape, and is disposed in the internal space 7 of the container 2 so that one end is disposed in the oil sump 8. The shaft 3 is supported by the container 2 so as to be rotatable about a rotation axis that is parallel to the central axis of the cylinder formed by the internal space 7. The shaft 3 rotates to supply refrigeration oil stored in the oil sump 8 to the compressor unit 5.

  The compressor unit 5 is disposed below the internal space 7 and is disposed above the oil sump 8. The compressor 1 further includes an upper muffler cover 14 and a lower muffler cover 15. The upper muffler cover 14 is disposed in the upper part of the compressor unit 5 in the internal space 7. The upper muffler cover 14 forms an upper muffler chamber 16 therein. The lower muffler cover 15 is disposed in the lower part of the compressor unit 5 in the internal space 7 and is disposed in the upper part of the oil sump 8. The lower muffler cover 15 forms a lower muffler chamber 17 therein. The lower muffler chamber 17 communicates with the upper muffler chamber 16 via a communication path (not shown) formed in the compressor unit 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 communicates with the internal space 7 through the compressed refrigerant discharge hole 18.

  The compressor unit 5 is a so-called rotary type compressor, which compresses the refrigerant supplied from the suction pipe 11 by the rotation of the shaft 3, and converts the compressed refrigerant into an upper muffler chamber 16 and a lower muffler chamber 17. To supply. The refrigerant is compatible with refrigerating machine oil. The three-phase motor 6 is disposed in the upper part of the compressor unit 5 in the internal space 7. The three-phase motor 6 includes a rotor 21 and a stator 22. The rotor 21 is fixed to the shaft 3. The stator 22 is formed in a substantially 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 windings 26. The upper insulator 24 is disposed on the upper portion of the stator core 23. The lower insulator 25 is disposed below the stator core 23. The upper insulator 24 and the lower insulator 25 are an example of an insulating portion that insulates the stator core 23 and the winding wire 26.

  FIG. 2 is a bottom view showing the stator core 23. The stator core 23 is formed, for example, by laminating a plurality of plates formed of a soft magnetic material exemplified by a silicon steel plate, and as shown in FIG. 2, the yoke portion 31 and the plurality of stator core teeth portions 32- 1-32-9. The yoke part 31 is formed in a substantially cylindrical shape. Of the plurality of stator core teeth portions 32-1 to 32-9, the first stator core teeth portion 32-1 is generally formed in a columnar shape. The first stator core teeth portion 32-1 is formed so that one end thereof 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 portion different from the first stator core teeth portion 32-1 among the plurality of stator core teeth portions 32-1 to 32-9 is also formed in a substantially columnar shape, similarly to the first stator core teeth portion 32-1. It protrudes from the inner peripheral surface of the yoke part 31. The plurality of stator core teeth portions 32-1 to 32-9 are further formed on the inner peripheral surface of the yoke portion 31 so as to be arranged at equal intervals of 40 degrees.

  FIG. 3 is a perspective view showing the lower insulator 25. The lower insulator 25 is formed of an insulator exemplified by polybutylene terephthalate resin (PBT), and, as shown in FIG. 3, an outer peripheral wall portion 41 and a plurality of insulator teeth portions 42-1 to 42-9, A plurality of flanges 43-1 to 43-9 are provided. The outer peripheral wall 41 is formed in a substantially cylindrical shape. The outer peripheral wall 41 has a plurality of slits 44 formed therein. Of the plurality of insulator tooth portions 42-1 to 42-9, the first insulator tooth portion 42-1 is formed in a shape of a straight column having a substantially semicircular cross section. The first insulator tooth portion 42-1 is formed so that one end thereof is continuously formed on the inner peripheral surface of the outer peripheral wall portion 41, that is, protrudes from the inner peripheral surface of the outer peripheral wall portion 41. An insulator tooth portion different from the first insulator tooth portion 42-1 among the plurality of insulator tooth portions 42-1 to 42-9 is also formed in a straight pillar shape, and like the first insulator tooth portion 42-1, It is formed so as to protrude from the inner peripheral surface of the outer peripheral wall portion 41. The plurality of insulator tooth portions 42-1 to 42-9 are formed on the inner peripheral surface of the outer peripheral wall portion 41 so as to be arranged at equal intervals of 40 degrees.

  The plurality of flange portions 43-1 to 43-9 correspond to the plurality of insulator tooth portions 42-1 to 42-9, and are each formed in a substantially semicircular plate shape. The 1st collar part 43-1 corresponding to the 1st insulator tooth part 42-1 of the some collar parts 43-1 to 43-9 is continuously formed in the other end of the 1st insulator tooth part 42-1. Has been. Of the plurality of flange portions 43-1 to 43-9, the flange portion different from the first flange portion 43-1 is also a plurality of insulator tooth portions 42-1 to 42-9, like the first flange portion 43-1. Is formed continuously at the other end.

  The upper insulator 24 is also formed in the same manner as the lower insulator 25, that is, is formed of an insulator, and includes an outer peripheral wall portion, a plurality of insulator tooth portions, and a plurality of flange portions.

  FIG. 4 is a bottom view showing the stator 22. As shown in FIG. 4, the plurality of windings 26 are wound around the plurality of stator core teeth portions 32-1 to 32-9 of the stator core 23. The plurality of windings 26 include a plurality of U-phase windings 46-U1 to 46-U3, a plurality of V-phase windings 46-V1 to 46-V3, and a plurality of W-phase windings 46-W1 to 46-W3. I have.

  The U-phase winding has a plurality of windings. Specifically, a first U-phase winding 46-U1, a second U-phase winding 46-U2, and a third U-phase winding 46-U3 are provided. The first U-phase winding 46-U1 is wound around the fourth stator core teeth portion 32-4. The second U-phase winding 46-U2 is wound around the seventh stator core teeth portion 32-7. The third U-phase winding 46-U3 is wound around the first stator core teeth portion 32-1.

  The V-phase winding has a plurality of windings. Specifically, a first V-phase winding 46-V1, a second V-phase winding 46-V2, and a third V-phase winding 46-V3 are provided. The first V-phase winding 46-V1 is wound around the eighth stator core teeth portion 32-8. Second V-phase winding 46-V2 is wound around second stator core teeth portion 32-2. The third V-phase winding 46-V3 is wound around the fifth stator core teeth portion 32-5.

  The W-phase winding has a plurality of windings. Specifically, a first W-phase winding 46-W1, a second W-phase winding 46-W2, and a third W-phase winding 46-W3 are provided. The first W-phase winding 46-W1 is wound around the sixth stator core teeth portion 32-6. The second W-phase winding 46-W2 is wound around the ninth stator core teeth portion 32-9. Third W-phase winding 46-W3 is wound around third stator core teeth portion 32-3.

  The first stator core teeth portion 32-1 has a third U together with a first insulator tooth portion 42-1 of the lower insulator 25, a first insulator tooth portion of the upper insulator 24, and an insulating film (not shown) disposed between these insulators. The phase winding 46-U3 is wound. For this reason, the third U-phase winding 46 -U 3 is appropriately insulated from the first stator core teeth portion 32-1 and appropriately insulated from the stator core 23 by the upper insulator 24 and the lower insulator 25. Further, the third U-phase winding 46-U3 is wound so as to be sandwiched between the first flange portion 43-1 of the lower insulator 25 and the outer peripheral wall portion 41, and the first flange portion and the outer periphery of the upper insulator 24 are wound. It is wound so as to be sandwiched between walls. For this reason, the third U-phase winding 46-U3 is prevented from being spilled by the upper insulator 24 and the lower insulator 25 so as to come off from the first stator core teeth portion 32-1 to the rotor 21 side.

  The other windings different from the third U-phase winding 46-U3 among the plurality of windings 26 are also appropriately insulated from the stator core 23 by the upper insulator 24 and the lower insulator 25, and spillage is prevented. .

  FIG. 5 is a development view showing a plurality of windings 26. As shown in FIG. 5, the first U-phase winding 46-U1 is wound around the fourth stator core teeth portion 32-4 counterclockwise. The second U-phase winding 46-U2 is wound clockwise around the seventh stator core teeth portion 32-7. The third U-phase winding 46-U3 is wound around the first stator core teeth portion 32-1 counterclockwise. The first V-phase winding 46-V1 is wound counterclockwise around the eighth stator core teeth portion 32-8. Second V-phase winding 46-V2 is wound around second stator core teeth portion 32-2 in a clockwise direction. The third V-phase winding 46-V3 is wound counterclockwise around the fifth stator core teeth portion 32-5. The first W-phase winding 46-W1 is wound counterclockwise around the sixth stator core teeth portion 32-6. The second W-phase winding 46-W2 is wound clockwise around the ninth stator core teeth portion 32-9. The third W-phase winding 46-W3 is wound around the third stator core teeth portion 32-3 counterclockwise.

  The stator 22 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. It has more. 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 are a plurality of stator cores. It arrange | positions at the upper insulator 24 side far from the lower insulator 25 from the teeth parts 32-1 to 32-9. In addition, since the lead side which is a power supply line is also arranged on the upper insulator 24 side, hereinafter, the upper insulator 24 side is also referred to as a lead side.

  One end of first U-phase neutral wire 47-U1 is electrically connected to first U-phase winding 46-U1. One end of the first U-phase neutral wire 47-U1 is arranged on the first direction side (left side in FIG. 5) of the fourth stator core teeth portion 32-4, and the other end is below the fourth stator core teeth portion 32-4. It is arranged on the lead side far from the insulator 25. One end of second U-phase neutral wire 47-U2 is electrically connected to second U-phase winding 46-U2. One end of the second U-phase neutral wire 47-U2 is disposed on the first direction side of the seventh stator core teeth portion 32-7, and the other end is disposed on the lead side from the seventh stator core teeth portion 32-7. . One end of third U-phase neutral wire 47-U3 is electrically connected to third U-phase winding 46-U3. One end of the third U-phase neutral wire 47-U3 is disposed on the first direction side of the first stator core teeth portion 32-1, and the other end is disposed on the lead side from the first stator core teeth portion 32-1. .

  The plurality of 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 first V-phase neutral wire 47-V1 is electrically connected to first V-phase winding 46-V1. One end of the first V-phase neutral wire 47-V1 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 from the fifth stator core teeth portion 32-5. . One end of second V-phase neutral wire 47-V2 is electrically connected to second V-phase winding 46-V2. One end of the second V-phase neutral wire 47-V2 is disposed on the first direction side of the second stator core teeth portion 32-2, and the other end is disposed on the lead side of the second stator core teeth portion 32-2. . One end of third V-phase neutral wire 47-V3 is electrically connected to third V-phase winding 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 plurality of 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 first W-phase neutral wire 47-W1 is electrically connected to first W-phase winding 46-W1. One end of the first W-phase neutral wire 47-W1 is disposed on the first direction side of the sixth stator core teeth portion 32-6, and the other end is disposed on the lead side of the sixth stator core teeth portion 32-6. . One end of second W-phase neutral wire 47-W2 is electrically connected to second W-phase winding 46-W2. One end of the second W-phase neutral wire 47-W2 is disposed on the first direction side of the ninth stator core teeth portion 32-9, and the other end is disposed on the lead side of the ninth stator core teeth portion 32-9. . One end of third W-phase neutral wire 47-W3 is electrically connected to third W-phase winding 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. .

  Stator 22 further includes a plurality of U-phase power supply lines 48-U1 to 48-U3, a plurality of V-phase power supply lines 48-V1 to 48-V3, and a plurality of W-phase power supply lines 48-W1 to 48-W3. Yes.

  One end of each of the plurality of U-phase power supply lines 48-U1 to 48-U3 is disposed on the lead side of the first stator core teeth portion 32-1, and one end thereof is in the second direction side of the first stator core teeth portion 32-1 (see FIG. 5 on the right). The other end of the first U-phase power supply line 48-U1 is electrically connected to the first U-phase winding 46-U1. The other end of second U-phase power supply line 48-U2 is electrically connected to second U-phase winding 46-U2. The other end of the third U-phase power supply line 48-U3 is electrically connected to the third U-phase winding 46-U3.

  The first U-phase power supply line 48 -U 1 further includes a first U-phase crossover line portion 49 -U 1 partially passing through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25. The first U-phase connecting wire portion 49 -U 1 that is a part of the first U-phase power supply line 48 -U 1 is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second U-phase power supply line 48-U2 further includes a second U-phase crossover line portion 49-U2 that partially passes through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25. The second U-phase connecting wire portion 49 -U 2 that is a part of the second U-phase power supply line 48 -U 2 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 plurality of V-phase power supply lines 48-V1 to 48-V3 is disposed on the lead side of the fifth stator core teeth portion 32-5, and one end thereof is disposed on the second direction side of the fifth stator core teeth portion 32-5. Has been. The other end of the first V-phase power supply line 48-V1 is electrically connected to the first V-phase winding 46-V1. The other end of the second V-phase power supply line 48-V2 is electrically connected to the second V-phase winding 46-V2. The other end of the third V-phase power supply line 48-V3 is electrically connected to the third V-phase winding 46-V3.

  The first V-phase power supply line 48-V1 further passes through the plurality of slits 44 of the outer peripheral wall 41 of the lower insulator 25, and includes a first V-phase crossover line portion 49-V1. The first V-phase connecting wire portion 49 -V 1 which is a part of the first V-phase power supply line 48 -V 1 is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second V-phase power supply line 48 -V 2 further passes through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25 and includes a second V-phase crossover line portion 49 -V 2. A second V-phase connecting wire portion 49 -V 2 that is a part of the second V-phase power supply line 48 -V 2 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 plurality of W-phase power supply lines 48-W1 to 48-W3 is disposed on the lead side of the third stator core teeth portion 32-3, and one end thereof is disposed on the second direction side of the third stator core teeth portion 32-3. Has been. The other end of the first W-phase power supply line 48-W1 is electrically connected to the first W-phase winding 46-W1. The other end of second W-phase power supply line 48-W2 is electrically connected to second W-phase winding 46-W2. The other end of third W-phase power supply line 48-W3 is electrically connected to third W-phase winding 46-W3.

  The first W-phase power supply line 48 -W 1 further passes through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25 and includes a first W-phase crossover line portion 49 -W 1. The first W-phase connecting wire portion 49 -W 1 that is a part of the first W-phase power supply line 48 -W 1 is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. The second W-phase power supply line 48-W2 further passes through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25 and includes a second W-phase crossover line portion 49-W2. A second W-phase connecting wire portion 49 -W 2 that is a part of the second W-phase power supply line 48 -W 2 is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25.

  FIG. 6 is a connection diagram illustrating a connection state of the plurality of windings 26. As shown in FIG. 6, the stator 22 further includes a plurality of neutral points. The plurality of neutral points are arranged on the lead side of the plurality of stator core teeth portions 32-1 to 32-9, and the first neutral point 51-1, the second neutral point 51-2, and the 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.

  One end of first U-phase winding 46-U1 is electrically connected to first neutral point 51-1 via first U-phase neutral line 47-U1, and the other end is first U-phase power supply line 48-U1. Is electrically connected to the U-phase power supply. One end of second U-phase winding 46-U2 is electrically connected to second neutral point 51-2 via second U-phase neutral line 47-U2, and the other end is second U-phase power supply line 48-U2. Is electrically connected to the U-phase power supply. One end of third U-phase winding 46-U3 is electrically connected to third neutral point 51-3 via third U-phase neutral line 47-U3, and the other end is third U-phase power supply line 48-U3. Is electrically connected to the U-phase power supply.

  One end of first V-phase winding 46-V1 is electrically connected to third neutral point 51-3 via first V-phase neutral line 47-V1, and the other end is first V-phase power supply line 48-V1. Is electrically connected to the V-phase power supply. One end of second V-phase winding 46-V2 is electrically connected to first neutral point 51-1 via second V-phase neutral line 47-V2, and the other end is second V-phase power supply line 48-V2. Is electrically connected to the V-phase power supply. One end of third V-phase winding 46-V3 is electrically connected to second neutral point 51-2 via third V-phase neutral line 47-V3, and the other end is third V-phase power supply line 48-V3. Is electrically connected to the V-phase power supply.

  One end of first W-phase winding 46-W1 is electrically connected to second neutral point 51-2 via first W-phase neutral wire 47-W1, and the other end is first W-phase power supply line 48-W1. Is electrically connected to the W-phase power supply. One end of second W-phase winding 46-W2 is electrically connected to third neutral point 51-3 via second W-phase neutral line 47-W2, and the other end is second W-phase power supply line 48-W2. Is electrically connected to the W-phase power supply. One end of third W-phase winding 46-W3 is electrically connected to first neutral point 51-1 via third W-phase neutral line 47-W3, and the other end is third W-phase power supply line 48-W3. Is electrically connected to the W-phase power supply.

[Method for Manufacturing Stator 22]
The stator 22 is manufactured by appropriately arranging a U-phase electric wire, a V-phase electric wire, and a W-phase electric wire on a stator core 23 to which an upper insulator 24 and a lower insulator 25 are appropriately attached using a winding machine. Is done. The electric wire is, for example, an enameled wire (an electric wire obtained by coating a copper wire with an enamel coating). The winding machine includes, for example, a U-phase electric wire nozzle, a V-phase electric wire nozzle, and a W-phase electric wire nozzle. The nozzle for U-phase electric wires, the nozzle for V-phase electric wires, and the nozzle for W-phase electric wires are fixed to each other. The U-phase electric wire can be arranged at a predetermined position with respect to the stator core 23 by appropriately moving the U-phase electric wire nozzle. The V-phase wire nozzle can be disposed at a predetermined position with respect to the stator core 23 by appropriately moving the nozzle for the V-phase wire. The W-phase wire nozzle can be disposed at a predetermined position with respect to the stator core 23 by appropriately moving the W-phase wire nozzle. The winding machine is not limited to the present embodiment, and may be provided with one nozzle.

  In the winding machine, first, a stator core 23 to which an upper insulator 24, a lower insulator 25, and an insulating film (not shown) are appropriately attached is set. The winding machine appropriately moves the nozzle for the U-phase electric wire so that one end of the U-phase electric wire is arranged on the lead side of the first stator core teeth portion 32-1, and the U-phase electric wire is connected to the first stator core teeth portion 32-1. Along one of the plurality of slits 44 along the second direction side. Next, the winding machine appropriately moves the nozzle for the U-phase electric wire so that the U-phase electric wire runs along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25, so that the first U-phase crossover wire portion 49 extends from the U-phase electric wire. -Forming U1. The winding machine further moves the nozzle for the U-phase electric wire appropriately and arranges the U-phase electric wire between one of the plurality of slits 44 to the fourth stator core teeth portion 32-4. First U-phase power supply line 48-U1 is formed. At this time, the winding machine forms the first V-phase power line 48-V1 from the V-phase wire by moving the nozzle for the V-phase wire and the nozzle for the W-phase wire in synchronization with the nozzle for the U-phase wire. The first W-phase power supply line 48-W1 is formed from the W-phase electric wire.

  Next, the winding machine appropriately moves the nozzle for the U-phase wire and winds the U-phase wire around the fourth stator core teeth portion 32-4 in the counterclockwise direction, so that the first U-phase winding from the U-phase wire. 46-U1 is formed. At this time, the winding machine winds the V-phase electric wire counterclockwise around the eighth stator core teeth portion 32-8 by moving the V-phase electric wire nozzle in synchronization with the U-phase electric wire nozzle. First V-phase winding 46-V1 is formed from the electric wire. The winding machine winds the W-phase electric wire counterclockwise around the sixth stator core teeth portion 32-6 by moving the W-phase electric wire nozzle in synchronization with the U-phase electric wire nozzle. 1W phase winding 46-W1 is formed.

  Next, the winding machine appropriately moves the U-phase electric wire nozzle to move the U-phase electric wire from the first direction side of the fourth stator core teeth portion 32-4 to the lead side of the fourth stator core teeth portion 32-4. The first U-phase neutral wire 47-U1 is formed from the U-phase electric wire. At this time, the winding machine forms the first V-phase neutral wire 47-V1 from the V-phase wire by moving the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle. Then, the first W-phase neutral wire 47-W1 is formed from the W-phase electric wire.

  Next, the winding machine appropriately moves the U-phase electric wire nozzle to move the U-phase electric wire from the lead side of the seventh stator core teeth portion 32-7 to the first direction side of the seventh stator core teeth portion 32-7. The second U-phase neutral wire 47-U2 is formed from the U-phase electric wire. At this time, the winding machine forms the second V-phase neutral wire 47-V2 from the V-phase electric wire by moving the V-phase electric wire nozzle and the W-phase electric wire nozzle in synchronization with the U-phase electric wire nozzle. Then, the second W-phase neutral wire 47-W2 is formed from the W-phase electric wire.

  Next, the winding machine appropriately moves the nozzle for the U-phase electric wire and winds the U-phase electric wire around the seventh stator core teeth portion 32-7 in a clockwise direction, so that the second U-phase winding 46 is turned from the U-phase electric wire. -Forming U2. At this time, the winding machine winds the V-phase wire around the second stator core teeth portion 32-2 in the clockwise direction by moving the V-phase wire nozzle in synchronization with the U-phase wire nozzle. To form a second V-phase winding 46-V2. The winding machine winds the W-phase electric wire clockwise around the ninth stator core teeth portion 32-9 by moving the W-phase electric wire nozzle in synchronism with the U-phase electric wire nozzle. The phase winding 46-W2 is formed.

  Next, the winding machine appropriately moves the nozzle for the U-phase electric wire and passes the U-phase electric wire through one of the plurality of slits 44 along the outer peripheral surface of the outer peripheral wall portion 41, thereby A 2U crossover portion 49-U2 is formed. The winding machine further moves the U-phase electric wire through the one of the plurality of slits 44 on the lead side of the first stator core teeth portion 32-1 by appropriately moving the nozzle for the U-phase electric wire. To form a second U-phase power supply line 48-U2. At this time, the winding machine forms the second V-phase power supply line 48-V2 from the V-phase wire by moving the nozzle for the V-phase wire and the nozzle for the W-phase wire in synchronization with the nozzle for the U-phase wire. The second W-phase power supply line 48-W2 is formed from the W-phase electric wire.

  Next, the winding machine appropriately moves the nozzle for the U-phase electric wire to move the U-phase electric wire from the lead side of the first stator core teeth portion 32-1 to the second direction side of the first stator core teeth portion 32-1. The third U-phase power supply line 48-U3 is formed from the U-phase electric wire. At this time, the winding machine forms the third V-phase power line 48-V3 from the V-phase wire by moving the V-phase wire nozzle and the W-phase wire nozzle in synchronization with the U-phase wire nozzle. The third W-phase power supply line 48-W3 is formed from the W-phase electric wire.

  Next, the winding machine appropriately moves the U-phase electric wire nozzle and winds the U-phase electric wire around the first stator core teeth portion 32-1 in the counterclockwise direction, so that the U-phase electric wire is turned into the third U-phase winding. 46-U3 is formed. At this time, the winding machine winds the V-phase wire around the fifth stator core teeth portion 32-5 in the counterclockwise direction by moving the V-phase wire nozzle in synchronization with the U-phase wire nozzle. A third V-phase winding 46-V3 is formed from the electric wire. The winding machine winds the W-phase electric wire counterclockwise around the third stator core teeth portion 32-3 by moving the W-phase electric wire nozzle in synchronization with the U-phase electric wire nozzle. 3W phase winding 46-W3 is formed.

  Next, the winding machine appropriately moves the U-phase electric wire nozzle to move the U-phase electric wire from the first direction side of the first stator core teeth portion 32-1 to the lead side of the first stator core teeth portion 32-1. By arranging in, the 3rd U-phase neutral wire 47-U3 is formed from a U-phase electric wire. At this time, the winding machine forms the third V-phase neutral wire 47-V3 from the V-phase electric wire by moving the V-phase electric wire nozzle and the W-phase electric wire nozzle in synchronization with the U-phase electric wire nozzle. Then, the third W-phase neutral wire 47-W3 is formed from the W-phase electric wire.

  By winding in this way, the third U-phase winding 46-U3 has both the winding start and winding end arranged on the lead side, as shown in FIGS. On the other hand, the first U-phase winding 46-U1 and the second U-phase winding 46-U2 start to be wound from the non-lead side and finish to be wound on the lead side. Accordingly, the number of turns around which the third U-phase winding 46-U3 is wound is different from the number of turns around which the first U-phase winding 46-U1 is wound, and the second U-phase winding 46-U2 is wound. It is different from the number of turns. Further, the first U-phase winding 46-U1 and the second U-phase winding 46-U2 have different lengths in which the U-phase power supply line connected to the U-phase power supply is routed. In other words, the first U-phase winding 46-U1 to the third U-phase winding 46-U3 have different winding methods including the number of windings and the length of the power supply line. For this reason, the lengths of the electric wires from the neutral point 51-1 to the U-phase power supply line are the first U-phase winding 46-U1, the second U-phase winding 46-U2, and the third U-phase winding 46-U3, respectively. And the impedance is also different.

  The first U-phase neutral line 47-U1 and the second U-phase neutral line 47-U2 are disconnected, the first V-phase neutral line 47-V1 and the second V-phase neutral line 47-V2 are disconnected, and the first W Phase neutral wire 47-W1 and second W phase neutral wire 47-W2 are disconnected. 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 a plurality of windings without peeling off the coating of the electric wire. Are electrically connected by a connection tool that can be electrically connected (hereinafter referred to as a connection tool). For example, a first splice terminal 52 as shown in FIG. 7 can be used as the connection tool. FIG. 7 is a perspective view showing a state before connection between the first splice terminal 52 and the electric wire. 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 fixed to each other by the first splice terminal 52. Thus, the first neutral point 51-1 is formed by being electrically connected to each other. As shown in FIG. 7, the three electric wires are stably bundled in a state of being in contact with each other. The first splice terminal 52 as a connection tool can fix the three wires to each other so as to wrap the bundled wires and electrically connect them to each other. In addition, the number of the electric wires bundled with the connection tool is not limited to three. That is, the number of bundles is not limited as long as the electric wires can be fixed to each other and electrically connected to each other. The end of the second U-phase neutral wire 47-U2, the end of the third V-phase neutral wire 47-V3, and the end of the first W-phase neutral wire 47-W1 are fixed to each other by the second splice terminal and electrically connected to each other. By being connected, the second neutral point 51-2 is formed. The end of the third U-phase neutral wire 47-U3, the end of the first V-phase neutral wire 47-V1, and the end of the second W-phase neutral wire 47-W2 are fixed to each other by the third splice terminal and electrically connected to each other. By being connected, the third neutral point 51-3 is formed. According to such an operation, the first neutral point 51-1, the second neutral point 51-2, and the third neutral point 51-3 can be easily formed.

[Operation of Compressor 1]
The compressor 1 is provided in a refrigeration cycle apparatus (not shown), and is used for compressing a refrigerant and circulating the refrigerant in the refrigeration cycle apparatus. The three-phase motor 6 includes three U-phase power supply lines 48-U1 to 48-U3, a plurality of V-phase power supply lines 48-V1 to 48-V3, and a plurality of W-phase power supply lines 48-W1 to 48-W3. A rotating magnetic field is generated by applying each phase voltage. The rotor 21 is rotated by the rotating magnetic field generated by the stator 22. The three-phase motor 6 rotates the shaft 3 as the rotor 21 rotates.

  When the shaft 3 rotates, the compressor unit 5 sucks the low-pressure refrigerant gas through the suction pipe 11 and generates the high-pressure refrigerant gas by compressing the sucked low-pressure refrigerant gas. Supply to the 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 the 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 the high-pressure refrigerant gas reduced in pressure pulsation is supplied to the compressor unit 5 and the three-phase motor 6 in the internal space 7. Is supplied to the space between and through the compressed refrigerant discharge hole 18.

  The high-pressure refrigerant gas supplied to the space between the compressor unit 5 and the three-phase motor 6 in the internal space 7 passes through the gap formed in the three-phase motor 6, thereby To the space above the three-phase motor 6. 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 subsequent to the compressor 1 in the refrigeration cycle device.

[Conventional three-phase motor]
FIG. 8 is a developed view showing a plurality of windings of a conventional three-phase motor. The conventional three-phase motor includes the first U-phase neutral wire 47-U1, the first V-phase neutral wire 47-V1, and the first W-phase neutral wire 47-W1 of the three-phase motor 6 of the embodiment described above. These are replaced with other first U-phase neutral wire 147-U1, first V-phase neutral wire 147-V1 and first W-phase neutral wire 147-W1, respectively.

  Part of the first U-phase neutral wire 147-U 1 is disposed outside the outer peripheral wall portion 41 of the lower insulator 25 through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25. That is, the first U-phase neutral wire 147-U1 includes the first U-phase connecting wire portion 101-U1. The first U-phase connecting wire portion 101 -U 1 is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. Further, the first U-phase neutral line 147-U1 is not disconnected from the second U-phase neutral line 47-U2, and remains connected to the second U-phase neutral line 47-U2.

  Part of the first V-phase neutral wire 147-V1 is disposed outside the outer peripheral wall portion 41 of the lower insulator 25 through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25. That is, the first V-phase neutral wire 147-V1 includes the first V-phase connecting wire portion 101-V1. The first V phase connecting wire portion 101 -V 1 is disposed along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. Further, the first V-phase neutral line 147-V1 is not disconnected from the second V-phase neutral line 47-V2, and remains connected to the second V-phase neutral line 47-V2.

  Part of the first W-phase neutral wire 147-W1 is disposed outside the outer peripheral wall portion 41 of the lower insulator 25 through the plurality of slits 44 of the outer peripheral wall portion 41 of the lower insulator 25. That is, the first W-phase neutral wire 147-W1 includes the first W-phase connecting wire portion 101-W1. The first W crossover wire portion 101 -W 1 is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. Further, the first W-phase neutral wire 147-W1 is not disconnected from the second W-phase neutral wire 47-W2, and remains connected to the second W-phase neutral wire 47-W2.

  In the three-phase motor 6 of the above-described embodiment, the first V-phase connecting wire portion 101-V1, the first W-phase connecting wire portion 101-W1, and the first W-phase connecting wire portion 101-W1 are not formed. Compared with the three-phase motor of the example, the required length of the electric wire can be shortened. Further, the stator of the conventional three-phase motor can be manufactured using a winding machine in the same manner as the stator 22 of the three-phase motor 6 of the above-described embodiment. At this time, when the winding machine forms the first U-phase neutral wire 147-U1 from the U-phase electric wire, the U-phase electric wire needs to be along the outer peripheral surface of the outer peripheral wall portion 41. The first U-phase neutral wire 47-U1 of the three-phase motor 6 of the embodiment described above is disconnected from the second U-phase neutral wire 47-U2. Therefore, when the first U-phase neutral wire 47-U1 is formed from the U-phase electric wire by the winding machine, there is no need to draw the U-phase electric wire to the outer peripheral surface of the outer peripheral wall portion 41, and the conventional three-phase motor Compared to the first U-phase neutral wire 147-U1, it can be formed in a short time. For this reason, the three-phase motor 6 of the above-described embodiment can be manufactured in a shorter time than the three-phase motor of the conventional example.

  FIG. 9 is a connection diagram illustrating a connection state of a plurality of windings 26 of a conventional three-phase motor. As shown in FIG. 9, the conventional three-phase motor further includes a plurality of neutral points 51-1 to 51-3 of the three-phase motor 6 of the above-described embodiment. Has been replaced. The plurality of U-phase windings 46-U1 to 46-U3 are electrically connected to one neutral point 102 via the plurality of U-phase neutral wires 47-U1 to 47-U3. The plurality of V-phase windings 46-V1 to 46-V3 are electrically connected to one neutral point 102 via the plurality of V-phase neutral wires 47-V1 to 47-V3. The plurality of W-phase windings 46-W1 to 46-W3 are electrically connected to one neutral point 102 via the plurality of W-phase neutral wires 47-W1 to 47-W3.

  One neutral point 102 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 47-47. It is formed by soldering each other after -W3 is peeled off. One neutral point 102 includes a plurality of U-phase neutral lines 47-U1 to 47-U3, a plurality of V-phase neutral lines 47-V1 to 47-V3, and a plurality of W-phase neutrals when the film is not peeled off. It forms by welding the copper wire itself which forms wire 47-W1-47-W3. On the other hand, a plurality of neutral points 51-1 to 51-3 of the three-phase motor 6 of the above-described embodiment are connectors that can electrically connect a plurality of windings without peeling off the winding film. As a result, it can be easily formed as compared with one neutral point 102. The step of bundling the windings constituting the neutral point with the connecting tool and the electrical connection step can be performed simultaneously. For this reason, the three-phase motor 6 of the above-described embodiment can be manufactured more easily than the three-phase motor of the conventional example. Incidentally, the plurality of neutral points 51-1 to 51-3 of the three-phase motor 6 of the above-described embodiment are formed by splice terminals, but may be formed by other crimp terminals different from the splice terminals. .

[Three-phase motor of Comparative Example 1]
In the three-phase motor of Comparative Example 1, the plurality of windings 26 of the three-phase motor 6 of the above-described embodiment are connected in another connection state different from the connection state of the three-phase motor 6 of the above-described embodiment. Yes. The first neutral point 51-1 includes a winding wound around the first stator core teeth portion 32-1 of the plurality of windings 26 and a winding wound around the third stator core teeth portion 32-3. And a winding wound around the fifth stator core teeth portion 32-5. That is, the first neutral point 51-1 is electrically connected to the third U-phase neutral wire 47-U3, the third V-phase neutral wire 47-V3, and the third W-phase neutral wire 47-W3. .

  The second neutral point 51-2 includes a winding wound around the second stator core teeth portion 32-2 of the plurality of windings 26 and a winding wound around the fourth stator core teeth portion 32-4. And a winding wound around the sixth stator core teeth portion 32-6. That is, the second neutral point 51-2 is electrically connected to the first U-phase neutral wire 47-U1, the second V-phase neutral wire 47-V2, and the first W-phase neutral wire 47-W1. .

  The third neutral point 51-3 includes a winding wound around the seventh stator core teeth portion 32-7 of the plurality of windings 26 and a winding wound around the eighth stator core teeth portion 32-8. And a wire wound around the ninth stator core teeth portion 32-9. That is, the third neutral point 51-3 is electrically connected to the second U-phase neutral wire 47-U2, the first V-phase neutral wire 47-V1, and the second W-phase neutral wire 47-W2. .

[Three-phase motor of Comparative Example 2]
In the three-phase motor of Comparative Example 2, a plurality of windings 26 of the three-phase motor 6 of the above-described embodiment are connected in another connection state different from the connection state of the three-phase motor 6 of the above-described embodiment. Yes. The first neutral point 51-1 includes a winding wound around the first stator core teeth portion 32-1 of the plurality of windings 26 and a winding wound around the third stator core teeth portion 32-3. And a winding wound around the fifth stator core teeth portion 32-5. That is, the first neutral point 51-1 is electrically connected to the third U-phase neutral wire 47-U3, the third V-phase neutral wire 47-V3, and the third W-phase neutral wire 47-W3. .

  The second neutral point 51-2 includes a winding wound around the fourth stator core teeth portion 32-4 of the plurality of windings 26 and a winding wound around the sixth stator core teeth portion 32-6. And the wire wound around the eighth stator core teeth portion 32-8. That is, the second neutral point 51-2 is electrically connected to the first U-phase neutral wire 47-U1, the first V-phase neutral wire 47-V1, and the first W-phase neutral wire 47-W1. .

  The third neutral point 51-3 includes a winding wound around the second stator core teeth portion 32-2 of the plurality of windings 26 and a winding wound around the seventh stator core teeth portion 32-7. And a wire wound around the ninth stator core teeth portion 32-9. That is, the third neutral point 51-3 is electrically connected to the second U-phase neutral wire 47-U2, the second V-phase neutral wire 47-V2, and the second W-phase neutral wire 47-W2. .

[Three-phase motor of Comparative Example 3]
In the three-phase motor of Comparative Example 3, a plurality of windings 26 of the three-phase motor 6 of the above-described embodiment are connected in another connection state different from the connection state of the three-phase motor 6 of the above-described embodiment. Yes. The first neutral point 51-1 includes a winding wound around the first stator core teeth portion 32-1 and a winding wound around the second stator core teeth portion 32-2. And a wire wound around the third stator core teeth portion 32-3. That is, the first neutral point 51-1 is electrically connected to the third U-phase neutral wire 47-U3, the second V-phase neutral wire 47-V2, and the third W-phase neutral wire 47-W3. .

  The second neutral point 51-2 includes a winding wound around the fourth stator core teeth portion 32-4 of the plurality of windings 26 and a winding wound around the fifth stator core teeth portion 32-5. And a winding wound around the sixth stator core teeth portion 32-6. That is, the second neutral point 51-2 is electrically connected to the first U-phase neutral wire 47-U1, the third V-phase neutral wire 47-V3, and the first W-phase neutral wire 47-W1. .

  The third neutral point 51-3 includes a winding wound around the seventh stator core teeth portion 32-7 of the plurality of windings 26 and a winding wound around the eighth stator core teeth portion 32-8. And a wire wound around the ninth stator core teeth portion 32-9. That is, the third neutral point 51-3 is electrically connected to the second U-phase neutral wire 47-U2, the first V-phase neutral wire 47-V1, and the second W-phase neutral wire 47-W2. .

  FIG. 10 is a line graph showing sound pressure levels of noise generated in the three-phase motor 6 of the embodiment and the three-phase motors of the first to third conventional examples. The line graph of FIG. 10 shows that the sound pressure level of the noise whose frequency is the value f among the noises generated in the three-phase motor 6 of the embodiment when the rotation speed of the three-phase motor 6 of the embodiment is 55 rps. It shows the largest. Further, in the line graph of FIG. 10, the frequency of the noise generated in the three-phase motor 6 of the example when the rotation speed of the three-phase motor of the conventional example 2 to the comparative example 3 is 55 rps is the value f. The sound pressure level of the sound is the highest. The value f indicates 330 Hz. That is, the line graph in FIG. 10 indicates that the sound pressure level of the sound having a frequency 6 times the rotation speed of the three-phase motor among the noises generated in the three-phase motor is the highest. The line graph of FIG. 10 can further evaluate the magnitude of noise using the sound pressure level of the sound having a frequency six times the rotation speed of the three-phase motor among the noise generated in the three-phase motor. Is shown.

  FIG. 11 shows a sound having a frequency of 270 Hz among noises generated in the three-phase motor 6 of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 45 rps. It is a bar graph which shows a pressure level. The bar graph of FIG. 11 shows that the sound pressure level of the noise of the three-phase motor 6 of the embodiment is approximately equal to the sound pressure level of the noise of the three-phase motor of the conventional example, and the sound of the noise of the three-phase motor 6 of the embodiment. It shows that the pressure level is slightly lower than the sound pressure level of the noise of the conventional three-phase motor. The bar graph of FIG. 11 further shows that the sound pressure level of noise of the three-phase motor 6 of the embodiment is smaller than the sound pressure level of noise of the three-phase motor of Comparative Examples 1 to 3, and the three-phase of the embodiment It shows that the noise of the motor 6 is smaller than that of the three-phase motors of Comparative Examples 1 to 3.

  FIG. 12 shows a sound having a frequency of 330 Hz among noises generated in the three-phase motor 6 of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 55 rps. It is a bar graph which shows a pressure level. The bar graph of FIG. 12 shows that the sound pressure level of the noise of the three-phase motor 6 of the embodiment is approximately equal to the sound pressure level of the noise of the three-phase motor of the conventional example, and the sound of the noise of the three-phase motor 6 of the embodiment. It shows that the pressure level is slightly lower than the sound pressure level of the noise of the conventional three-phase motor. The bar graph of FIG. 12 further shows that the sound pressure level of the noise of the three-phase motor 6 of the embodiment is smaller than the sound pressure level of the noise of the three-phase motor of Comparative Examples 1 to 3, and the three-phase of the embodiment It shows that the noise of the motor 6 is smaller than that of the three-phase motors of Comparative Examples 1 to 3.

  FIG. 13 shows a sound having a frequency of 360 Hz among noises generated in the three-phase motor 6 of the embodiment and the three-phase motors of the conventional example to the comparative example 3 when the rotation speed of the three-phase motor is 60 rps. It is a bar graph which shows a pressure level. The bar graph of FIG. 13 shows that the sound pressure level of the noise of the three-phase motor 6 of the embodiment is approximately equal to the sound pressure level of the noise of the three-phase motor of the conventional example. It shows that the pressure level is slightly lower than the sound pressure level of the noise of the conventional three-phase motor. The bar graph of FIG. 13 further shows that the sound pressure level of the noise of the three-phase motor 6 of the embodiment is smaller than the sound pressure level of the noise of the three-phase motor of Comparative Examples 1 to 3, and the three-phase of the embodiment It shows that the noise of the motor 6 is smaller than that of the three-phase motors of Comparative Examples 1 to 3.

  The bar graph of FIG. 11, the bar graph of FIG. 12, and the bar graph of FIG. 13 are connected to a plurality of windings 26 and a plurality of neutral points 51-1 to 51-3 even when the rotation speed of the three-phase motor is different. When the values are different, the noise level of the three-phase motor is different. The bar graph of FIG. 11, the bar graph of FIG. 12, and the bar graph of FIG. 13 further indicate that the noise of the three-phase motor 6 of the example is smaller than the noise of the three-phase motor of Comparative Examples 1 to 3.

[Effect of motor of embodiment]
The three-phase motor 6 according to the embodiment includes a rotor 21 and a stator 22 that generates a magnetic field for rotating the rotor 21. The stator 22 includes a plurality of stator core teeth 32-1 to 32-9, a plurality of U-phase windings 46-U1 to 46-U3, a plurality of V-phase windings 46-V1 to 46-V3, and a plurality of W-phase windings. Lines 46-W1 to 46-W3. The plurality of U-phase windings 46-U1 to 46-U3, the plurality of V-phase windings 46-V1 to 46-V3, and the plurality of W-phase windings 46-W1 to 46-W3 are a plurality of stator core teeth portions 32. -1 to 32-9, respectively. The stator 22 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. It has more. The plurality of U-phase windings 46-U1 to 46-U3 are electrically connected to the plurality of neutral points 51-1 to 51-3 via the plurality of U-phase neutral wires 47-U1 to 47-U3. ing. The plurality of V-phase windings 46-V1 to 46-V3 are electrically connected to the plurality of neutral points 51-1 to 51-3 via the plurality of V-phase neutral wires 47-V1 to 47-V3. ing. The plurality of W-phase windings 46-W1 to 46-W3 are electrically connected to the plurality of neutral points 51-1 to 51-3 via the plurality of W-phase neutral wires 47-W1 to 47-W3. ing. 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 are a plurality of stator cores. It is arranged on the lead side closer to the plurality of neutral points 51-1 to 51-3 than the teeth portions 32-1 to 32-9. That is, these neutral wires are not routed to the non-lead side, but are neutral (U-phase neutral wires 47-U1 to 47-U3, V-phase neutral wires 47-V1 to 47-V3). , W-phase neutral wires 47-W1 to 47-W3) are arranged on the lead side. At this time, as shown in FIGS. 5 and 6, the neutral wire that is one end of each winding is disposed on the first direction side so as to correspond to each tooth. Further, the power supply line which is the other end of each winding is arranged on the second direction side.

  In such a three-phase motor 6, it is confirmed by appearance that each of these neutral wires is connected to a winding wound around which of the plurality of stator core teeth portions 32-1 to 32-9. can do. The operator can appropriately connect these neutral lines to the plurality of neutral points 51-1 to 51-3 based on the appearance of these neutral lines. Further, in the three-phase motor 6, since each neutral wire is not routed to the non-lead side, a plurality of U-phase neutral wires 47-U1 to 47-U3 and a plurality of V-phase neutral wires 47- The length of the electric wire which forms V1-47-V3 and the some W phase neutral wire 47-W1-47-W3 can be shortened. The three-phase motor 6 can further reduce the work time in which the electric wire is wound around the plurality of stator core teeth portions 32-1 to 32-9.

  Further, the stator 33 of the three-phase motor 6 of the embodiment includes a plurality of U-phase power supply lines 48-U1 to 48- electrically connecting the plurality of U-phase windings 46-U1 to 46-U3 to the U-phase power supply, respectively. U3 is further provided. The stator 33 has a plurality of U-phase windings 46-U1 to 46-U3 and a plurality of U-phase neutral wires 47-U1 to 47-U3, with one U-phase electric wire wired like a single stroke. And a plurality of U-phase power supply lines 48-U1 to 48-U3 are formed. At this time, the end of the second U-phase power supply line 48-U2 connected to the U-phase power supply is arranged on the lead side and connected to the U-phase power supply of the third U-phase power supply line 48-U3. It is connected to the side edge. Similarly, the plurality of V-phase windings 46-V1 to 46-V3, the plurality of V-phase neutral wires 47-V1 to 47-V3, and the plurality of V-phase power supply lines 48-V1 to 48-V3 are 1 It is formed by wiring the V-phase electric wires of the book like a single stroke. Similarly, the plurality of W-phase windings 46-W1 to 46-W3, the plurality of W-phase neutral wires 47-W1 to 47-W3, and the plurality of W-phase power supply lines 48-W1 to 48-W3 are 1 It is formed by wiring the W-phase electric wires of a book like a single stroke. By forming the stator 33 in this way, the step of connecting the wires when winding the wires can be omitted, and the winding operation of the wires can be simplified and speeded up. Therefore, the three-phase motor 6 can be easily manufactured.

  Moreover, the stator 33 of the three-phase motor 6 of the embodiment further includes a lower insulator 25 that is disposed on the opposite side of the plurality of stator core teeth portions 32-1 to 32-9. The second U-phase power line 48-U2 is a second U-phase crossover line portion disposed on the opposite lead side farther from the plurality of neutral points 51-1 to 51-3 than the plurality of stator core teeth portions 32-1 to 32-9 49-U2. The second U-phase connecting wire portion 49 -U 2 is disposed along the outer peripheral side of the lower insulator 25. The third U-phase power supply line 48-U3 does not include a portion disposed on the opposite lead side of the plurality of stator core teeth portions 32-1 to 32-9, and includes the plurality of stator core teeth portions 32-1 to 32-9. It is arranged on the lead side. The plurality of U-phase windings 46-U1 to 46-U3 may have different numbers of turns due to the plurality of U-phase power supply lines 48-U1 to 48-U3 being formed in this way. The plurality of U-phase windings 46-U1 to 46-U3 have different impedances due to different numbers of windings. Similarly, the plurality of V-phase windings 46-V1 to 46-V3 and the plurality of W-phase windings 46-W1 to 46-W3 may have different impedances. For this reason, the three-phase motor 6 has a current balance of the plurality of neutral points 51-1 to 15-3 when the plurality of windings 26 are not properly connected to the plurality of neutral points 51-1 to 15-3. May collapse and generate noise. A plurality of neutral wires can be visually confirmed as to which winding is connected, and can be appropriately connected to the plurality of neutral points 51-1 to 15-3. The three-phase motor 6 can reduce noise by appropriately connecting a plurality of neutral wires to a plurality of neutral points 51-1 to 15-3.

  The compressor 1 of the embodiment includes a three-phase motor 6 and a compressor unit 5 that compresses the refrigerant by the power that the rotor 21 rotates. Such a compressor 1 can shorten the time for manufacturing the three-phase motor 6 by shortening the time for manufacturing.

  By the way, although the compressor part 5 of the compressor 1 in which the three-phase motor 6 of the above-described embodiment is provided is formed of a rotary compressor, another compressor part formed of a mechanism different from the rotary compressor. May be substituted. As the mechanism, a scroll compressor is exemplified.

  Although the embodiments have been described above, the embodiments are not limited to the above-described contents. In addition, the above-described constituent elements include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, at least one of various omissions, substitutions, and changes of the components can be made without departing from the scope of the embodiments.

DESCRIPTION OF SYMBOLS 1: Compressor 2: Container 5: Compressor part 6: Three-phase motor 7: Internal space 21: Rotor 22: Stator 23: Stator core 25: Lower insulator 26: Multiple windings 41: Outer wall part 46-U1-46 -U3: a plurality of U-phase windings 46-V1-46-V3: a plurality of V-phase windings 46-W1-46-W3: a plurality of W-phase windings 47-U1-47-U3: in a plurality of U-phases Sex lines 47-V1 to 47-V3: Plural V-phase neutral lines 47-W1 to 47-W3: Plural W-phase neutral lines 48-U1 to 48-U3: Plural U-phase power lines 48-V1 48-V3: a plurality of V-phase power supply lines 48-W1 to 48-W3: a plurality of W-phase power supply lines 49-U1: first U-phase crossover line portion 49-U2: second U-phase crossover line portion 49-V1: first V Phase crossover line portion 49-V2: Second V phase crossover line portion 49-W : The 1W phase transition wire portion 49-W2: first 2W phase transition wire portion 51-1 to 51-3: more neutral

Claims (5)

The rotor,
A three-phase motor comprising a stator that generates a magnetic field for rotating the rotor,
The stator is
With multiple teeth,
Each of the plurality of teeth wound around, a plurality of windings having a neutral wire on one end side and a power line on the other end side,
A plurality of neutral points formed by electrically connecting the neutral wires;
The three-phase motor is arranged on the lead side where the power line is arranged so that the neutral wire corresponds to each of the plurality of teeth. The three-phase motor according to claim 1, wherein at least two of the power lines are connected by a single electric wire. The three-phase motor according to claim 2, wherein the neutral wire and the power supply wire are arranged so as to sandwich the teeth. 4. The three-phase motor according to claim 3, wherein when the side on which the neutral wire is disposed across the teeth is defined as the first direction side, all the neutral wires are disposed on the first direction side. A three-phase motor according to any one of claims 1 to 4,
And a compressor unit that compresses the refrigerant by the power of rotation of the rotor.

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