JP7283049B2 - compressor - Google Patents

Description

The present invention relates to compressors.

For example, a compressor includes a motor for driving a compression section that compresses refrigerant. The motor includes a rotor provided with permanent magnets and a stator that rotates the rotor by generating a rotating magnetic field, and transmits rotational power to the compression section via a shaft fixed to the rotor. The stator has a plurality of teeth, and windings are formed by winding an electric wire around each of the plurality of teeth. In the winding, each of a plurality of winding parts wound around each tooth is star-connected (star-shaped connection), and one end of the winding part wound around each tooth is connected to a power supply, and the winding is performed. The other end of the section (called the neutral wire) is connected to the neutral point.

JP 2010-166643 A

For example, in the case of a 9-slot type 3-phase motor, in order to connect each neutral wire at the neutral point, there is a motor in which nine neutral wires are bundled together and joined by soldering. In the case of soldering, it is necessary to peel off the insulating film of the electric wire, and the workability of assembling the motor is low. For this reason, it has been proposed to join the neutral wire by crimping through the connection terminal using a crimping machine instead of joining by soldering.

When connecting neutral wires by crimping, if four or more neutral wires are bundled, it becomes difficult to properly bond each neutral wire, so three neutral wires are crimped. Therefore, when nine neutral wires are connected at a neutral point, three neutral wire bundles are generated, with three neutral wires as one set. Therefore, in the process of assembling the motor, the neutral wires are combined and connected for every three predetermined neutral wires, and the three sets of neutral wires are handled.

By the way, in some compressors, the neutral point of the neutral wire is inserted into and held in the gap between the adjacent winding portions. Therefore, when inserting the three sets of neutral wires as described above into the gaps between the winding portions, the inventors of the present application individually inserted the three sets of neutral wires into the three gaps. In the case of this structure, the inventor of the present application believes that the opening area of the gap is reduced according to the arrangement of the three sets of neutral wires, and the flow resistance of the refrigerant passing through the gap is increased, so that the compression part is lubricated. It has been found that the amount of lubricating oil (refrigerating machine oil) flowing out of the compressor (hereinafter also referred to as the amount of discharged oil) increases. As the amount of oil delivered increases, it becomes difficult to properly seal and lubricate the compression section.

The disclosed technology has been made in view of the above, and an object thereof is to provide a compressor capable of suppressing an increase in the amount of discharged oil without degrading the assembling workability of the motor.

One aspect of the compressor disclosed in the present application includes a motor having a rotor and a stator that generates a magnetic field that rotates the rotor, and a compression section that compresses refrigerant by the rotor rotating a rotating shaft. , the stator includes a plurality of teeth, a winding portion wound around each of the plurality of teeth, a neutral wire provided on one end side of the winding portion, and a neutral wire provided on the other end side of the winding portion. a plurality of windings having a power supply line; and a plurality of neutral points electrically connected to each of the three neutral wires corresponding to each of the three phases via a connecting member, A plurality of first fixing portions in which three neutral wires are fixed to each other with respect to the stator at a position closer to the winding portion than the plurality of neutral points, and a plurality of sets connected at each of the plurality of neutral points. and a second fixing portion in which the neutral wires are twisted into a bundle and fixed to each other, and the second fixing portion is provided between adjacent winding portions among the plurality of winding portions. inserted into one of the gaps between

According to one aspect of the compressor disclosed in the present application, it is possible to suppress an increase in the amount of discharged oil without reducing the workability of assembling the motor.

FIG. 1 is a longitudinal sectional view showing a compressor of Example 1. FIG. FIG. 2 is a plan view showing the three-phase motor in Example 1 from the upper insulator side. FIG. 3 is a bottom view showing the stator core in Example 1. FIG. FIG. 4 is a perspective view showing the lower insulator in Example 1. FIG. FIG. 5 is a bottom view of the stator according to the first embodiment. FIG. 6 is an exploded view showing a plurality of windings in Example 1. FIG. FIG. 7 is a wiring diagram showing a connection state of a plurality of windings in the first embodiment. FIG. 8 is a perspective view showing a state before connecting the first splice terminal and the electric wire in the first embodiment. FIG. 9 is a flow chart for explaining the stator manufacturing process according to the first embodiment. 10A is a plan view showing a state in which nine neutral wires are drawn in Embodiment 1. FIG. 10B is a plan view showing a state in which three neutral wires out of nine neutral wires form the first fixing portion in the first embodiment; FIG. 10C is a plan view showing a state in which three neutral wires out of the remaining six neutral wires form the first fixing part in the first embodiment; FIG. 10D is a plan view showing a state in which the remaining three neutral wires form the first fixing part in the first embodiment; FIG. 11A is a side view showing a state in which the lengths of three sets of neutral wires are aligned in the first embodiment; FIG. 11B is a side view showing a state in which each of three sets of neutral wires are joined by crimping in Example 1. FIG. 11C is a side view showing a state in which three sets of neutral wires are bundled together in the first embodiment. FIG. 11D is a side view showing a state in which the bundled neutral wires are covered with an insulating tube in Embodiment 1. FIG. FIG. 12 is a plan view showing the three-phase motor according to the second embodiment from the upper insulator side. FIG. 13 is a plan view showing the three-phase motor in the reference example from the side of the upper insulator. FIG. 14 is a graph showing a comparison of the discharge amount of refrigerating machine oil between the compressors of Examples 1 and 2 and the compressor of Reference Example.

Hereinafter, embodiments of the compressor disclosed in the present application will be described in detail based on the drawings. It should be noted that the compressor disclosed in the present application is not limited to the following embodiments.

FIG. 1 is a longitudinal sectional view showing a compressor of Example 1. FIG. 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. The container 2 forms a closed internal space 7 . The internal space 7 is formed in a generally columnar 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 placed vertically on a horizontal surface. An oil reservoir 8 is formed in the lower part of the internal space 7 of the container 2 . Refrigerating machine oil, which is lubricating oil for lubricating the compression portion 5 , is stored in the oil reservoir 8 . A suction pipe 11 for sucking the refrigerant and a discharge pipe 12 for discharging the compressed refrigerant are connected to the container 2 . A shaft 3 as a rotating shaft is formed in a bar shape and arranged in the internal space 7 of the container 2 so that one end thereof 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 column forming the internal space 7 . The shaft 3 rotates to supply the refrigerating machine oil stored in the oil reservoir 8 to the compression section 5 .

The compression part 5 is arranged below 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. - 特許庁The upper muffler cover 14 is arranged above the compression section 5 in the internal space 7 . The upper muffler cover 14 forms an upper muffler chamber 16 inside. The lower muffler cover 15 is provided below the compression section 5 in the internal space 7 and arranged above the oil sump 8 . The lower muffler cover 15 forms a lower muffler chamber 17 inside. The lower muffler chamber 17 communicates with 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 communicates with the internal space 7 via the compressed refrigerant discharge hole 18 .

The compression section 5 compresses the refrigerant supplied from the suction pipe 11 by rotating the shaft 3 and supplies the compressed refrigerant to the upper muffler chamber 16 and the lower muffler chamber 17 . The refrigerant has compatibility with refrigerator oil. The three-phase motor 6 is arranged above the compression section 5 in the internal space 7 .

FIG. 2 is a plan view showing the three-phase motor 6 according to the first embodiment from the upper insulator side. As shown in FIGS. 1 and 2, the three-phase motor 6 includes a rotor 21 and a stator 22. As shown in FIG. The rotor 21 is formed in a columnar shape by laminating a plurality of thin plates (magnetic bodies) of silicon steel, and is integrated with a plurality of rivets 9 . A shaft 3 is inserted through and fixed to the center of the rotor 21 . Six slit-shaped magnet embedding holes 10 a are formed in the rotor 21 so as to form each side of a hexagon centered on the shaft 3 . The magnet embedding holes 10a are formed at predetermined intervals in the circumferential direction of the rotor 21. As shown in FIG. A plate-like permanent magnet 10b is embedded in the magnet embedding hole 10a.

The stator 22 is generally cylindrical, arranged to surround the rotor 21 and fixed to the container 2 . The stator 22 includes a stator core 23 , upper insulators 24 and lower insulators 25 , and multiple windings 46 . Upper insulator 24 is fixed to the upper portion of stator core 23 . Lower insulator 25 is fixed to the lower portion of stator core 23 . The upper insulator 24 and the lower insulator 25 are examples of insulating portions that insulate the stator core 23 and the windings 46 from each other.

FIG. 3 is a bottom view showing the stator core 23 according to the first embodiment. The stator core 23 is formed by laminating a plurality of plates made of a soft magnetic material such as a silicon steel plate, and as shown in FIG. -9. The yoke portion 31 is generally cylindrical. A first stator core tooth portion 32-1 among the plurality of stator core tooth portions 32-1 to 32-9 is formed in a substantially columnar shape. One end of the first stator core tooth portion 32 - 1 is formed continuously with the inner peripheral surface of the yoke portion 31 , that is, formed to protrude from the inner peripheral surface of the yoke portion 31 . A stator core tooth portion different from the first stator core tooth portion 32-1 among the plurality of stator core tooth portions 32-1 to 32-9 is also formed in a substantially columnar shape like the first stator core tooth portion 32-1. and protrudes from the inner peripheral surface of the yoke portion 31 . A plurality of stator core teeth portions 32-1 to 32-9 are further formed on the inner peripheral surface of the yoke portion 31 at regular intervals of 40 degrees.

FIG. 4 is a perspective view showing the lower insulator 25 according to the first embodiment. The lower insulator 25 is made of an insulator exemplified by polybutylene terephthalate resin (PBT), and as shown in FIG. , and a plurality of flanges 43-1 to 43-9. The outer peripheral wall portion 41 is formed in a substantially cylindrical shape. A plurality of slits 44 are formed in the outer peripheral wall portion 41 . A first insulator tooth portion 42-1 among the plurality of insulator tooth portions 42-1 to 42-9 is formed in a straight columnar shape having a substantially semicircular cross section. One end of the first insulator tooth portion 42 - 1 is formed continuously with the inner peripheral surface of the outer peripheral wall portion 41 , that is, formed to protrude from the inner peripheral surface of the outer peripheral wall portion 41 . Of the plurality of insulator teeth portions 42-1 to 42-9, the insulator teeth portions different from the first insulator teeth portion 42-1 are also formed in a straight columnar shape, and similar to the first insulator teeth portion 42-1, It is formed so as to protrude from the inner peripheral surface of the outer peripheral wall portion 41 . A plurality of insulator teeth portions 42-1 to 42-9 are formed on the inner peripheral surface of the outer peripheral wall portion 41 at regular intervals of 40 degrees.

The plurality of collar 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 first collar portion 43-1 corresponding to the first insulator tooth portion 42-1 among the plurality of collar portions 43-1 to 43-9 is formed continuously with the other end of the first insulator tooth portion 42-1. It is Of the plurality of collars 43-1 to 43-9, the collars different from the first collar 43-1 also have a plurality of insulator teeth 42-1 to 42-9, like the first collar 43-1. is formed continuously with the other end of the

The upper insulator 24 is also formed similarly to the lower insulator 25 . That is, the upper insulator 24 is formed of an insulator, 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. are doing.

FIG. 5 is a bottom view showing the stator 22 in Example 1. FIG. A plurality of windings 46 are wound around the plurality of stator core teeth portions 32-1 to 32-9 of the stator core 23, as shown in FIG. A winding portion 45 is formed by each winding wire 46 in each stator core tooth portion 32-1 to 32-9. The three-phase motor in the embodiment is a 6-pole, 9-slot concentrated winding motor (see FIG. 2). The plurality of windings 46 includes 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. and have.

The U-phase winding has multiple windings. Specifically, as U-phase windings, 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 tooth portion 32-4. The second U-phase winding 46-U2 is wound around the seventh stator core tooth portion 32-7. The third U-phase winding 46-U3 is wound around the first stator core tooth portion 32-1.

The V-phase winding comprises multiple windings. Specifically, the V-phase winding includes a first V-phase winding 46-V1, a second V-phase winding 46-V2, and a third V-phase winding 46-V3. The first V-phase winding 46-V1 is wound around the eighth stator core tooth portion 32-8. The second V-phase winding 46-V2 is wound around the second stator core tooth portion 32-2. The third V-phase winding 46-V3 is wound around the fifth stator core tooth portion 32-5.

The W-phase winding comprises multiple windings. Specifically, the W-phase winding includes a first W-phase winding 46-W1, a second W-phase winding 46-W2, and a third W-phase winding 46-W3. The first W-phase winding 46-W1 is wound around the sixth stator core tooth portion 32-6. The second W-phase winding 46-W2 is wound around the ninth stator core tooth portion 32-9. The third W-phase winding 46-W3 is wound around the third stator core tooth portion 32-3.

The first stator core tooth portion 32-1 is an insulating film arranged between the first insulator tooth portion 42-1 of the lower insulator 25, the first insulator tooth portion of the upper insulator 24, and these insulators 24, 25. (not shown) are wound together with a third U-phase winding 46-U3. Therefore, the third U-phase winding 46-U3 is appropriately insulated from the first stator core tooth portion 32-1 and from the stator core 23 by the upper insulator 24 and the lower insulator 25. FIG. Furthermore, 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 and the outer peripheral wall. Therefore, the upper insulator 24 and the lower insulator 25 prevent the third U-phase winding 46-U3 from deviating from the first stator core tooth portion 32-1 to the rotor 21 side, that is, so-called spillage.

Other windings of the plurality of windings 46, which are different from the third U-phase winding 46-U3, are also appropriately insulated from the stator core 23 by the upper insulator 24 and the lower insulator 25, thereby preventing winding failure.

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

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. and furthermore. 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 connected to the plurality of stator core teeth. It is arranged on the side of the upper insulator 24 farther from the lower insulator 25 than the portions 32-1 to 32-9. Since the lead side, which is the power supply line, is also arranged on the upper insulator 24 side, the upper insulator 24 side is hereinafter also referred to as the lead side in this specification.

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

The plurality of V-phase neutral wires 47-V1 to 47-V3 include the first V-phase neutral wire 47-V1, the second V-phase neutral wire 47-V2, and the third V-phase neutral wire 47-V3. I have. One end of the first V-phase neutral wire 47-V1 is electrically connected to the first V-phase winding 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 tooth portion 32-5, and the other end is arranged on the lead side of the fifth stator core tooth portion 32-5. It is One end of the second V-phase neutral wire 47-V2 is electrically connected to the second V-phase winding 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 tooth portion 32-2, and the other end is arranged on the lead side of the second stator core tooth portion 32-2. It is One end of the third V-phase neutral wire 47-V3 is electrically connected to the third V-phase winding 46-V3. One end of the third V-phase neutral wire 47-V3 is arranged on the first direction side of the fifth stator core tooth portion 32-5, and the other end is arranged on the lead side of the fifth stator core tooth portion 32-5. It is

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. I have. One end of the first W-phase neutral wire 47-W1 is electrically connected to the first W-phase winding 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 tooth portion 32-6, and the other end is arranged on the lead side of the sixth stator core tooth portion 32-6. It is The second W-phase neutral wire 47-W2 has one end electrically connected to the second W-phase winding 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 tooth portion 32-9, and the other end is arranged on the lead side of the ninth stator core tooth portion 32-9. It is One end of the third W-phase neutral wire 47-W3 is electrically connected to the third W-phase winding 46-W3. One end of the third W-phase neutral wire 47-W3 is arranged on the first direction side of the third stator core tooth portion 32-3, and the other end is arranged on the lead side of the third stator core tooth portion 32-3. It is

The stator 22 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. I have more.

One end of the plurality of U-phase power supply lines 48-U1 to 48-U3 is arranged on the lead side of the first stator core tooth portion 32-1, and one end thereof is on the second direction side of the first stator core tooth portion 32-1. (right side in FIG. 6). 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 the second U-phase power supply line 48-U2 is electrically connected to the 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-U1 further partially passes through a plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25 and includes a first U-phase crossover line portion 49-U1. A first U-phase crossover wire portion 49-U1, which is a part of the first U-phase power supply line 48-U1, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG. The second U-phase power supply line 48-U2 further partially passes through the plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25 and includes a second U-phase crossover line portion 49-U2. A second U-phase connecting wire portion 49-U2, which is a part of the second U-phase power supply line 48-U2, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG.

One end of the plurality of V-phase power supply lines 48-V1 to 48-V3 is arranged on the lead side of the fifth stator core tooth portion 32-5, and one end thereof is on the second direction side of the fifth stator core tooth portion 32-5. are placed in 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 partially passes through the plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25 and includes a first V-phase crossover line portion 49-V1. A first V-phase transition wire portion 49-V1, which is a part of the first V-phase power supply line 48-V1, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG. The second V-phase power line 48-V2 further partially passes through the plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25 and includes a second V-phase crossover line portion 49-V2. A second V-phase transition wire portion 49-V2, which is a part of the second V-phase power supply line 48-V2, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG.

One end of the plurality of W-phase power lines 48-W1 to 48-W3 is arranged on the lead side of the third stator core tooth portion 32-3, and one end thereof is on the second direction side of the third stator core tooth portion 32-3. are placed in 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 the second W-phase power supply line 48-W2 is electrically connected to the second W-phase winding 46-W2. The other end of the third W-phase power supply line 48-W3 is electrically connected to the third W-phase winding 46-W3.

The first W-phase power supply line 48-W1 further partially passes through the plurality of slits 44 in the outer peripheral wall portion 41 of the lower insulator 25 and includes a first W-phase crossover line portion 49-W1. A first W-phase crossover wire portion 49-W1, which is a part of the first W-phase power supply line 48-W1, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG. The second W-phase power supply line 48-W2 further partially passes through the plurality of slits 44 in 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 crossover wire portion 49-W2, which is a part of the second W-phase power supply line 48-W2, is arranged along the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25. As shown in FIG.

FIG. 7 is a connection diagram showing the connection state of the plurality of windings 46 in the first embodiment. The three-phase motor in the embodiment is a motor having a star connection in which the windings 46 are connected in parallel. Stator 22 further comprises a plurality of neutral points, as shown in FIG. The plurality of neutral points are arranged on the lead side of the plurality of stator core teeth portions 32-1 to 32-9. It has a 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 winding 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 connected to the first U-phase power wire 48. - is electrically connected to the U-phase power supply via U1; The second U-phase winding 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 connected to the second U-phase power wire 48. - is electrically connected to the U-phase power supply via U2; The third U-phase winding 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 connected to the third U-phase power wire 48. - is electrically connected to the U-phase power supply via U3;

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

The first W-phase winding 46-W1 has one end electrically connected to the second neutral point 51-2 through the first W-phase neutral wire 47-W1, and the other end of the first W-phase power wire 48. - It is electrically connected to the W-phase power supply via W1. The second W-phase winding 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 connected to the second W-phase power wire 48. - It is electrically connected to the W-phase power supply via W2. The third W-phase winding 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 connected to the third W-phase power wire 48. - It is electrically connected to the W-phase power supply via W3.

[Manufacturing method of stator]
The stator 22 is manufactured by appropriately arranging the U-phase electric wire, the V-phase electric wire and the W-phase electric wire on the stator core 23 to which the upper insulator 24 and the lower insulator 25 are properly attached using a winding machine. be. The electric wire is, for example, an enameled wire (an electric wire in which a copper wire is coated with an enamel coating). The winding machine includes, for example, a U-phase wire nozzle, a V-phase wire nozzle, and a W-phase wire nozzle. The U-phase wire nozzle, the V-phase wire nozzle, and the W-phase wire nozzle are fixed to each other. By appropriately moving the U-phase wire nozzle, the U-phase wire can be arranged at a predetermined position with respect to the stator core 23 . By appropriately moving the V-phase wire nozzle, the V-phase wire can be arranged at a predetermined position with respect to the stator core 23 . By appropriately moving the W-phase wire nozzle, the W-phase wire can be arranged at a predetermined position with respect to the stator core 23 . Note that the winding machine is not limited to the configuration of the first embodiment, and a machine having only one nozzle may be used.

First, the winding machine is set with the upper insulator 24, the lower insulator 25, and the stator core 23 to which an insulating film (not shown) is appropriately attached. By appropriately moving the U-phase wire nozzle, the winding machine arranges one end of the U-phase wire on the lead side of the first stator core tooth portion 32-1, and moves the U-phase wire to the first stator core tooth portion 32-1. 1 along the second direction side and passed through one of the plurality of slits 44. - 特許庁Next, the winding machine appropriately moves the nozzle for the U-phase wire to cause the U-phase wire to follow the outer peripheral surface of the outer peripheral wall portion 41 of the lower insulator 25 , thereby extending the U-phase wire from the first U-phase connecting wire portion 49 . - form U1. The winding machine further properly moves the U-phase wire nozzle to arrange the U-phase wire between one of the plurality of slits 44 and the fourth stator core tooth portion 32-4, thereby moving the U-phase wire to form a first U-phase power supply line 48-U1. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle synchronously with the U-phase wire nozzle to form the first V-phase power wire 48-V1 from the V-phase wire. , W-phase wires form a first W-phase power supply wire 48-W1.

Next, the winding machine appropriately moves the U-phase wire nozzle to wind the U-phase wire around the fourth stator core tooth portion 32-4 in a counterclockwise direction. Form 46-U1. At this time, the winding machine moves the V-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the V-phase wire around the eighth stator core tooth portion 32-8 in a counterclockwise direction. A first V-phase winding 46-V1 is formed from the wire. The winding machine moves the W-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the W-phase wire around the sixth stator core tooth portion 32-6 counterclockwise. A 1W phase winding 46-W1 is formed.

Next, the winding machine appropriately moves the U-phase wire nozzle to move the U-phase wire from the first direction side of the fourth stator core tooth portion 32-4 to the lead side of the fourth stator core tooth portion 32-4. to form the first U-phase neutral wire 47-U1 from the U-phase 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 synchronously with the U-phase wire nozzle. and form a first W-phase neutral wire 47-W1 from the W-phase wire.

Next, the winding machine properly moves the U-phase wire nozzle to move the U-phase wire from the lead side of the seventh stator core tooth portion 32-7 to the first direction side of the seventh stator core tooth portion 32-7. to form a second U-phase neutral wire 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 synchronously with the U-phase wire nozzle to form the second V-phase neutral wire 47-V2 from the V-phase wire. and form a second W-phase neutral wire 47-W2 from the W-phase wire.

Next, the winding machine moves the nozzle for the U-phase wire appropriately to wind the U-phase wire around the seventh stator core teeth portion 32-7 clockwise, whereby the U-phase wire is turned to the second U-phase winding 46. - form U2. At this time, the winding machine moves the V-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the V-phase wire around the second stator core teeth portion 32-2 in a clockwise direction. to form a second V-phase winding 46-V2. The winding machine moves the W-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the W-phase wire around the ninth stator core tooth portion 32-9 in a clockwise direction. A phase winding 46-W2 is formed.

Next, the winding machine appropriately moves the nozzle for the U-phase wire to pass the U-phase wire through one of the plurality of slits 44 and along the outer peripheral surface of the outer peripheral wall portion 41 . A 2U transition line portion 49-U2 is formed. The winding machine further properly moves the nozzle for the U-phase wire to arrange the U-phase wire through one of the plurality of slits 44 on the lead side of the first stator core teeth portion 32-1, whereby the U-phase wire to form a second U-phase power supply line 48-U2. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle synchronously with the U-phase wire nozzle to form the second V-phase power wire 48-V2 from the V-phase wire. , form a second W-phase power supply line 48-W2 from the W-phase electric wire.

Next, the winding machine appropriately moves the U-phase wire nozzle to move the U-phase wire from the lead side of the first stator core tooth portion 32-1 to the second direction side of the first stator core tooth portion 32-1. to form a third U-phase power supply line 48-U3 from the U-phase electric wire. At this time, the winding machine moves the V-phase wire nozzle and the W-phase wire nozzle synchronously with the U-phase wire nozzle to form the third V-phase power wire 48-V3 from the V-phase wire. , W-phase wires form a third W-phase power wire 48-W3. A first connection terminal 50-1 is connected to one end of a bundle of a plurality of U-phase power supply lines 48-U1 to 48-U3, and a plurality of V-phase power supply lines 48-V1 to 48-V3 are connected to one end. A second connection terminal 50-2 is connected to one end of the bundle, and a third connection terminal 50-3 is connected to one end of the bundle of the plurality of W-phase power supply lines 48-W1 to 48-W3. (see Figure 2).

Next, the winding machine appropriately moves the U-phase wire nozzle to wind the U-phase wire around the first stator core teeth portion 32-1 counterclockwise, thereby winding the U-phase wire to the third U-phase winding. Form 46-U3. At this time, the winding machine moves the V-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the V-phase wire around the fifth stator core tooth portion 32-5 in a counterclockwise direction. A third V-phase winding 46-V3 is formed from the wire. The winding machine moves the W-phase wire nozzle in synchronism with the U-phase wire nozzle to wind the W-phase wire around the third stator core tooth portion 32-3 in a counterclockwise direction. A 3W phase winding 46-W3 is formed.

Next, the winding machine appropriately moves the U-phase wire nozzle to move the U-phase wire from the first direction side of the first stator core tooth portion 32-1 to the lead side of the first stator core tooth portion 32-1. to form a third U-phase neutral wire 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 synchronously with the U-phase wire nozzle to form the third V-phase neutral wire 47-V3 from the V-phase wire. and form a third W-phase neutral wire 47-W3 from the W-phase wire.

By winding as described above, both the winding start portion and the winding end portion of the third U-phase winding 46-U3 are 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 winding from the opposite lead side and end at the lead side. Therefore, the number of turns around which the third U-phase winding 46-U3 is wound differs from the number of turns around which the first U-phase winding 46-U1 is wound, and the number of turns around which the second U-phase winding 46-U2 is wound. different from the number of turns. Also, the first U-phase winding 46-U1 and the second U-phase winding 46-U2 are different in the length of the U-phase power supply line connected to the U-phase power supply. In other words, the 1st U-phase winding 46-U1 to the 3rd U-phase winding 46-U3 differ in the winding method including the number of windings and the length of the power line. Therefore, the length of the electric wire from the neutral point 51-1 to the U-phase power line is the first U-phase winding 46-U1, the second U-phase winding 46-U2, and the third U-phase winding 46-U3. are different and the impedances are also different.

The first U-phase neutral wire 47-U1 and the second U-phase neutral wire 47-U2 are separated, the first V-phase neutral wire 47-V1 and the second V-phase neutral wire 47-V2 are separated, and the first W-phase neutral wire 47-V1 and the second V-phase neutral wire 47-V2 are separated. Phase neutral wire 47-W1 and second W-phase neutral wire 47-W2 are separated. 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 formed into a plurality of windings without peeling off the coating of the electric wire. are electrically connected by a connecting tool (hereinafter referred to as a connecting tool).

As the connection member, for example, a first splice terminal 52-1 as shown in FIG. 8 is used. FIG. 8 is a perspective view showing a state before connecting the first splice terminal 52-1 and the electric wire in the first embodiment. In the first 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 connected to the first splice terminal 52-1. The first neutral point 51-1 is formed by being joined to each other by crimping through and electrically connected to each other. As shown in FIG. 8, three electric wires (neutral wires) are stably bundled while being in contact with each other. The first splice terminal 52-1 as a connecting member can wrap the bundled wires and connect three wires to each other by crimping to electrically connect them. By crimping the wire group by the first splice terminal 52-1, the coating film of each wire is peeled off by the uneven portion of the first splice terminal 52-1, and the three wires are joined. Note that the number of wires bundled by the connection member is not limited to three. In other words, the number of wires to be bundled is not limited as long as the wires can be crimped and electrically connected to each other. Embodiment 1 may be configured to have two sets of connection members, for example, a connection member that bundles six wires and a connection member that bundles three wires.

Similarly, 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 connected via the second splice terminal 52-2. The second neutral point 51-2 is formed by being mutually crimped and electrically connected to each other. 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 joined by crimping to each other by a third splice terminal 52-3. are electrically connected to each other to form a third neutral point 51-3. Thereby, the first neutral point 51-1, the second neutral point 51-2 and the third neutral point 51-3 can be easily formed.

[Compressor operation]
The compressor 1 is provided as a component of a refrigeration cycle device (not shown), and is used to compress refrigerant and circulate the refrigerant in a refrigerant circuit of the refrigeration cycle device. The three-phase motor 6 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. A rotating magnetic field is generated by applying a voltage, respectively. 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 rotating the rotor 21 .

As the shaft 3 rotates, the compression unit 5 sucks the low-pressure refrigerant gas through the suction pipe 11, compresses the sucked low-pressure refrigerant gas to generate a high-pressure refrigerant gas, and raises the high-pressure refrigerant gas. It is supplied to the muffler chamber 16 and the lower muffler chamber 17 . The lower muffler cover 15 reduces 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 the high-pressure refrigerant gas with reduced pressure pulsation is transferred between the compression section 5 in the internal space 7 and the three-phase motor 6 . is supplied through the compressed refrigerant discharge hole 18 to the space between .

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 the gap formed in the three-phase motor 6, It is supplied 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 arranged downstream of the compressor 1 in the refrigeration cycle device.

[Characteristic Configuration of Compressor]
Next, a characteristic configuration of the three-phase motor 6 in Embodiment 1 will be described. As described above, the three U-phase neutral wires 47-U1 to 47-U3, the three V-phase neutral wires 47-V1 to 47-V3, and the three W-phase neutral wires 47-W1 to 47-W3 (hereinafter also referred to as neutral wire 47) are connected at respective neutral points 51-1 to 51-3 (also referred to as neutral point 51). A feature of the first embodiment includes the mounting structure of nine neutral wires 47 to the stator 22 .

The nine neutral wires 47 are composed of three first fixing portions 56 fixed to the stator 22 at positions closer to the winding portion 45 than the neutral points 51 and extending from the first fixing portions 56 to the neutral points. and a second fixing portion 57 in which three sets of neutral wires 47 connected at each of the three neutral points 51 are bundled together. Each neutral point 51 side of the neutral wires 47 bundled by the second fixing portion 57 is covered with an insulating tube 58 as an insulating member. It is inserted into one gap G between the winding portions 45 adjacent to each other in the direction of rotation of the rotor 21 (see FIG. 2).

Since the neutral wire 47 is held by the stator 22 by inserting the second fixing portion 57 into the gap G in this way, movement of the neutral wire 47 due to vibration during use of the three-phase motor 6 is suppressed. be done. In addition, by inserting the second fixing portion 57 into one gap G, the opening area of the gap G is reduced compared to a structure in which three sets of neutral wires 47 are individually inserted into a plurality of gaps G. suppressed. Here, the opening area of the gap G refers to the area on the cross section perpendicular to the axial direction of the shaft 3 rotated by the three-phase motor 6 .

When the compressor 5 discharges the refrigerant, the refrigerant containing the refrigerating machine oil passes through the gap G and reaches the upper space of the container 2 of the compressor 1 . In the upper space of the container 2, the refrigerant containing the refrigerating machine oil is separated from the refrigerating machine oil by the density difference between the gas refrigerant and the refrigerating machine oil, and the gas refrigerant flows through the discharge pipe 12 to the outside of the compressor 1. , the refrigerating machine oil flows along the inner wall of the container 2 and returns to the oil reservoir 8 . By suppressing a decrease in the opening area of the gap G as described above, an increase in the flow resistance of the coolant passing through the gap G is suppressed, and an increase in the flow velocity of the coolant passing through the gap G is suppressed. The gas refrigerant and the refrigerating machine oil are properly separated in the upper space of the container 2 , and the refrigerant containing the refrigerating machine oil is prevented from being discharged from the compressor 1 . Therefore, the amount of oil discharged from the compressor 1 to the outside is suppressed.

[Main part of stator manufacturing process]
A main part of the manufacturing process of the stator 22 of the three-phase motor 6 will be described. FIG. 9 is a flow chart for explaining the manufacturing process of the stator 22 according to the first embodiment. As shown in FIG. 9, by winding the stator 22 as described above (step S1), each winding 46 is formed, and each wire supplied from each wire nozzle is cut. (Step S2), one end (neutral wire 47) of each winding wire 46 is cut off from each wire nozzle side.

Next, among the neutral wires 47 of each winding 46, the neutral wires 47 of the U phase, the V phase, and the W phase are set as one set, and the three neutral wires 47 are arranged in the upper insulator 24. , and the three neutral wires 47 are fixed to each other at one point in the circumferential direction of the upper insulator 24 (in the first embodiment, the three neutral wires 47 are bundled into one When the base of each neutral wire 47 is twisted, the three neutral wires 47 are fixed to each other (step S3), thereby connecting the three neutral wires 47 to the stator. 22 to form a first fixing portion 56 . In step S3, regarding the nine neutral wires 47 respectively extended from the nine winding portions 45, the three neutral wires 47 are used as one set to form the first fixing portion 56, thereby forming three sets of neutral wires 47. Each of the neutral wires 47 is fixed by each of the three first fixing portions 56 respectively. Details of the process of forming the first fixing portion 56 will be described later.

Next, by cutting the three pairs of neutral wires 47 extending from each first fixing portion 56 to a predetermined length (step S4), the three pairs of neutral wires 47 are connected to the first fixing portion 56 Align the length from Subsequently, each of the three sets of neutral wires 47 is joined by crimping via each splice terminal 52 (52-1 to 52-3) (step S5) to form each of the three neutral points 51. do. Subsequently, the three sets of neutral wires 47 are bundled and the three sets of neutral wires 47 are fixed together (in the first embodiment, the three sets of neutral wires 47 are bundled and twisted together). ) (step S6), thereby forming the second fixing portion 57 in which the three sets of neutral wires 47 are bundled together. Details of the process of forming the second fixing portion 57 will be described later.

Next, by inserting the bundled neutral wires 47 into the insulating tube 58 (step S7), the overall insulation of the neutral wires 47 extended from the winding portions 45 is ensured. be. Finally, each splice terminal 52 (each neutral point 51) side of the neutral wire 47 covered with the insulating tube 58 is housed in the gap G between the adjacent winding portions 45 (step S8).

[Step of Forming First Fixing Part]
FIG. 10A is a plan view showing a state in which nine neutral wires 47 are drawn out in the first embodiment. FIG. 10B is a plan view showing a state in which three neutral wires 47 out of nine neutral wires 47 form the first fixing portion 56 in the first embodiment. FIG. 10C is a plan view showing a state in which three neutral wires 47 out of the remaining six neutral wires 47 form the first fixing portion 56 in the first embodiment. FIG. 10D is a plan view showing a state in which the remaining three neutral wires 47 form the first fixing portion 56 in the first embodiment. 10A to 10D are top views of the stator 22 viewed from the side of the upper insulator 24, and each winding portion 45, which is nine slots, are numbered 1 to 9 in counterclockwise order.

As shown in FIG. 10A, three U-phase neutral wires 47-U1 to 47-U3, three V-phase neutral wires 47-V1 to 47-V3, and three W-phase neutral wires 47- Nine neutral wires 47, W1 to 47-W3, are drawn from each winding 45 of the stator 22, respectively. First, as shown in FIGS. 10A and 10B, of the nine neutral wires 47, the V-phase neutral wires 47-V2 drawn from the respective winding portions 45 of Nos. 2, 3, and 4 in the figure , W-phase neutral wire 47-W3 and U-phase neutral wire 47-U1 are extended along the outer peripheral surface of the upper insulator 24 and, for example, are twisted together in the vicinity of the winding portion 45 of No. 7 to form three wires. A first fixing portion 56 is formed by fixing the roots of the neutral wires 47 together. At this time, of the three neutral wires 47, the V-phase neutral wire 47-V2 is extended clockwise, and the W-phase neutral wire 47-W3 and U-phase neutral wire 47-U1 are extended counterclockwise. , and the three neutral wires 47 are twisted together.

That is, in the first fixing portion 56, the neutral wire 47 extending toward one side in the circumferential direction of the upper insulator 24 and the neutral wire extending toward the other side in the circumferential direction of the upper insulator 24 47 are twisted and fixed to each other. The amount of twisting the three neutral wires 47 is preferably, for example, about three turns, and the three neutral wires 47 are temporarily fixed (temporarily fixed) in the circumferential direction of the upper insulator 24. This makes fixing work easier. By routing the three neutral wires 47 as described above, the neutral wires 47 extending to one side and the other side in the circumferential direction of the insulator 24 are formed so as to pull each other with the insulator 24 interposed therebetween. Therefore, the neutral wire 47 extending from the winding portion 45 to the first fixing portion 56 is tensioned and fixed to the insulator 24 . Of the three neutral wires 47, the neutral wire 47 extending clockwise and the neutral wire 47 extending counterclockwise are not limited to the above combinations. 24 may be changed as appropriate according to the position where the first fixing portion 56 is formed in the circumferential direction.

10B and 10C, of the remaining six neutral wires 47, winding portions No. 5, No. 6, and No. 7 in the figure 45, the V-phase neutral wire 47-V3, the W-phase neutral wire 47-W1 and the U-phase neutral wire 47-U2 are extended along the outer peripheral surface of the upper insulator 24 to form the winding portion No. 7. By twisting together in the vicinity of 45, a first fixed portion 56 is formed to which three neutral wires 47 are fixed. At this time, of the three neutral wires 47, the V-phase neutral wire 47-V3 is extended clockwise, and the W-phase neutral wire 47-W1 and U-phase neutral wire 47-U2 are extended counterclockwise. , and the three neutral wires 47 are twisted together.

10C and 10D, of the remaining three neutral wires 47, winding portions No. 8, No. 9, and No. 1 in the figure 45, the V-phase neutral wire 47-V1, the W-phase neutral wire 47-W2 and the U-phase neutral wire 47-U3 are extended along the outer peripheral surface of the upper insulator 24 to form the winding portion No. 7. By twisting together in the vicinity of 45, a first fixed portion 56 is formed to which three neutral wires 47 are fixed. At this time, of the three neutral wires 47, the V-phase neutral wire 47-V1 and the W-phase neutral wire 47-W2 are extended clockwise, and the U-phase neutral wire 47-U3 is extended counterclockwise. , and the three neutral wires 47 are twisted together.

As shown in FIG. 10D , the nine neutral wires 47 are grouped into three neutral wires 47 , and three sets of neutral wires 47 are led out from each of the three first fixed portions 56 . The three first fixing portions 56 are arranged close to each other in the circumferential direction of the stator 22, and can facilitate the work of twisting three sets of neutral wires 47, which will be described later. In addition, it is not limited to the configuration in which the three neutral wires 47 are routed as one set as described above. counterclockwise).

Since the stator 22 has the first fixing portion 56 , the nine neutral wires 47 can be fixed to the upper insulator 24 . Movement of the sexual line 47 can be suppressed. In addition, the stator 22 has the first fixing portion 56 so that the bases of the three neutral wires 47 connected at the neutral point 51 are fixed. As a result, it is possible to easily perform the work of connecting at the neutral point 51.

[Step of Forming Second Fixing Part]
FIG. 11A is a side view showing a state in which the lengths of three sets of neutral wires 47 are aligned in the first embodiment. FIG. 11B is a side view showing a state in which each of the three sets of neutral wires 47 are joined by crimping in the first embodiment. As shown in FIG. 11A, three sets of neutral wires 47 extended from each of the three first fixing portions 56 are aligned in length from the first fixing portion 56 by cutting one end. By forming the first fixing portion 56, the length of the neutral wire 47 can be easily aligned. Subsequently, as shown in FIG. 11B, every three sets of neutral wires 47 are joined by crimping via splice terminals 52 . Since the three neutral wires 47 are grouped into one set by the first fixing portion 56, when the neutral wires 47 of the U-phase, V-phase, and W-phases are spliced through the splice terminal 52, they can be connected to each other. It is possible to prevent erroneous joining of the phases to be connected, and improve workability in assembly.

FIG. 11C is a side view showing a state in which three sets of neutral wires 47 are bundled together in the first embodiment. FIG. 11D is a side view showing a state in which the bundled neutral wires 47 are covered with an insulating tube 58 in the first embodiment. As shown in FIG. 11C, the bundled second fixing portion 57 is formed by twisting the three sets of neutral wires 47 together. By forming the second fixing portion 57, the tension acting on the neutral wire 47 routed along the outer peripheral wall portion 41 of the upper insulator 24 is further increased. Movement of the neutral wire 47 due to vibration is suppressed.

In the first embodiment, the second fixing portion 57 is formed by bundling three sets of neutral wires 47 and twisting them up to the splice terminal 52 (neutral point 51). The structure is not limited to this structure, and the second fixing portion 57 may be formed by twisting only a portion of the three sets of neutral wires 47 bundled together.

Subsequently, as shown in FIG. 11D , the second fixing portion 57 where the three sets of neutral wires 47 are gathered and the splice terminal 52 are covered with the insulating tube 58 , so that the neutral point 51 is separated from the first fixing portion 56 . insulated over Since the three sets of neutral wires 47 are bundled together by the second fixing portion 57, the three sets of neutral wires 47 can be insulated collectively with one insulating tube 58 without being individually insulated. It becomes possible, and the increase in manufacturing cost is suppressed. As shown in FIG. 2 , the second fixing portion 57 covered with the insulating tube 58 passes from the outer peripheral side of the upper insulator 24 through the slits 44 as cutouts to form the gap G between the adjacent winding portions 45 . is inserted in the

The second fixing portion 57 is inserted into the gap G between the winding portions 45 on the outer peripheral side of the stator 22 in the radial direction, and interference with the rotor 21 is suppressed. Also, the second fixing portion 57 is inserted along the central axis direction of the stator 22 , that is, along the vertical direction of the compressor 1 . The neutral point 51 side of the insulating tube 58 is formed in a flat belt shape, and the flat insulating tube 58 is inserted along the central axis direction of the stator 22, so that the refrigerant or the refrigerating medium passing through the gap G is removed. It is suppressed that it becomes a flow resistance of the machine oil. As a result, an increase in the flow velocity of the refrigerating machine oil passing through the gap G is suppressed, so that the amount of discharged refrigerating machine oil discharged to the outside of the compressor 1 can be suppressed.

In the first embodiment, the second fixing portion 57 in which the three sets of neutral wires 47 are bundled is inserted into the gap G and held, but the structure is not limited to that of the first embodiment. A second embodiment will be described below with reference to the drawings. In Example 2, the same constituent members as those in Example 1 are assigned the same reference numerals as those in Example 1, and description thereof is omitted. The second embodiment differs from the first embodiment in that three sets of neutral wires 47 covered with insulating tubes 58-1, 58-2 and 58-3 are inserted into one gap G. FIG.

FIG. 12 is a plan view showing the three-phase motor according to the second embodiment from the upper insulator 24 side. As shown in FIG. 12, in Example 2, all three pairs of neutral wires 47 are inserted into one gap G between the winding portions 45 in an independent state without being fixed to each other. In other words, Example 2 does not include the second fixing portion 57 in which the three sets of neutral wires 47 are fixed to each other. Each neutral point 51 of the three sets of neutral wires 47 is covered with insulating tubes 58-1, 58-2 and 58-3. , 58-3 are positioned close to each other. The arrangement of the three insulating tubes is not limited, and may be arranged along the radial direction of the stator 22 within the gap G, for example.

[Ratio of oil discharge amount]
Regarding Examples 1 and 2 described above, the discharge amount of refrigerating machine oil discharged from the compressor 1 to the outside will be described in comparison with a reference example. FIG. 13 is a plan view showing the three-phase motor 6 in the reference example from the upper insulator 24 side. In the reference example, the same reference numerals as in the first embodiment are attached to the same constituent members as in the first embodiment, and the description thereof is omitted. FIG. 14 is a graph showing a comparison of the discharge amount of refrigerating machine oil between the compressors of Examples 1 and 2 and the compressor of Reference Example. In FIG. 14, the vertical axis indicates the ratio [%] of the discharged oil amount when the discharged oil amount in the reference example is 100[%].

As shown in FIG. 13, in the reference example, each insulating tube 58-1, 58-2, 58-3 of three sets of neutral wires 47 is inserted into each of three gaps G, and three Neutral points 51 are arranged unevenly in the circumferential direction of stator 22 . The three sets of neutral wires 47 are each covered with an insulating material at each neutral point 51 . In each gap G, each neutral point 51 is sandwiched and held between the side surfaces of the winding portions 45 facing each other.

As shown in FIG. 14, regarding the discharge amount of refrigerating machine oil discharged from the compressor 1 to the outside, when the reference example in which the three sets of neutral wires 47 are unevenly arranged in the three gaps G is used as a reference, , both in Examples 1 and 2, decreased to about 67 [%]. In other words, by inserting three pairs of neutral wires 47 into one gap G as in the first and second embodiments, the number of locations that block the gap G is reduced, so that the reduction in the opening area of the gap G can be suppressed. can. Therefore, an increase in the flow resistance of the coolant passing through the gap G can be suppressed, and an increase in the flow velocity of the coolant passing through the gap G can be suppressed. As a result, the flow rate of the refrigerant passing through the plurality of gaps G in the stator 22 can be suppressed from increasing by reducing the discharge amount of the refrigerating machine oil.

As described above, in the windings 46 of the three-phase motor 6 in the first and second embodiments, the multiple neutral wires 47 are covered with insulating tubes 58-1, 58-2, 58-3. All of the plurality of sets of neutral wires 47 connected at each of the plurality of neutral points 51 are connected to one gap G between adjacent winding portions 45 among the plurality of winding portions 45 . is inserted in the As a result, the plurality of sets of neutral wires 47 inserted into the gap G are held by the stator 22, so that the movement of the neutral wires 47 due to vibrations that occur when the three-phase motor 6 is used is suppressed. The stability of the attached state of the wire 47 can be enhanced. In addition, by inserting all of the plurality of sets of neutral wires 47 into one gap G, the gap G can be reduced compared to a structure in which the plurality of sets of neutral wires 47 are individually inserted into the plurality of gaps G. Since the number of closed portions is reduced, reduction in the opening area of the gap G can be suppressed. Therefore, an increase in the flow resistance of the coolant passing through the gap G can be suppressed, and an increase in the flow velocity of the coolant passing through the gap G can be suppressed. By suppressing an increase in the flow velocity of the refrigerant passing through the gap G in this way, it is possible to properly separate the gas refrigerant and the refrigerating machine oil in the upper space of the container 2 of the compressor 1 . It is possible to suppress the discharge amount of the refrigerating machine oil discharged to the outside. Therefore, the compressor 1 can properly seal and lubricate the compression portion 5 with the refrigerating machine oil, and the operational reliability of the compression portion 5 can be enhanced. In addition, by fixing the plurality of neutral wires 47 to each other by the first fixing portion 56, movement of the neutral wires 47 due to vibration during use of the three-phase motor 6 is suppressed, and the installation of the neutral wires 47 is suppressed. State stability can be increased.

In addition, the plurality of neutral wires 47 in the first embodiment includes second fixing portions 57 to which the plurality of neutral wires 47 are fixed to each other between the plurality of first fixing portions 56 and the plurality of neutral points 51. and the second fixing portion 57 is inserted into one gap G. As a result, the plurality of sets of neutral wires 47 are prevented from moving within the gap G, and the stability of the inserted state of the plurality of sets of neutral wires 47 in the gap G can be enhanced. In addition, for example, compared to the case where nine neutral wires 47 are joined by soldering, a set of three neutral wires 47 connected at the neutral point 51 is fixed to each other by the first fixing portion 56. In addition, the three sets of neutral wires 47 are fixed to each other by the second fixing part 67, so that the nine neutral wires 47 can be easily handled, and the three neutral wires connected in a predetermined combination can be easily handled. It is possible to prevent erroneous combinations of 47. Therefore, workability in assembling the three-phase motor 6 can be improved, and the efficiency of the assembling work can be improved.

In the second fixed portion 57 of the three-phase motor 6 in the first embodiment, a plurality of sets of neutral wires 47 connected at each of the plurality of neutral points 51 are twisted into one bundle. Thus, by twisting the three sets of neutral wires 47 fixed by the first fixing portion 56 , each set of neutral wires 47 can be twisted while being restricted by the first fixing portion 56 . Therefore, for example, compared to the case of bundling and twisting the nine neutral wires 47 that are not fixed by the first fixing portion 56, the work of twisting the nine neutral wires 47 is facilitated. It is possible to easily form the second fixing portion 57 in which the neutral wires 47 of are bundled together.

Also, the second fixing portion 57 of the three-phase motor 6 in the first embodiment is covered with an insulating tube 58 . This makes it possible to collectively insulate a plurality of sets of neutral wires 47 compared to a structure in which a plurality of sets of neutral wires 47 are individually insulated. In addition, by covering the second fixing portion 57 with the insulating tube 58, compared with the case where the neutral wires 47 of each group are individually insulated, variations in the state of insulation are suppressed, and an increase in the manufacturing cost of the three-phase motor 6 is suppressed. can be suppressed.

Further, the second fixing portion 57 of the three-phase motor 6 in the first embodiment is inserted on the outer peripheral side of the gap G in the radial direction of the stator 22 . Thereby, interference between the second fixing portion 57 inserted into the gap G and the rotor 21 can be avoided.

Also, the second fixing portion 57 of the three-phase motor 6 in the first embodiment is inserted into the gap G between the adjacent winding portions 45 through the slit 44 from the outer peripheral side of the upper insulator 24 . As a result, the second fixing portion 57 drawn around from the first fixing portion 56 is supported by the slit 44, so that the second fixing portion 57 is prevented from moving with respect to the upper insulator 24 and is inserted into the gap G. The stability of the attached state of the second fixing portion 57 thus formed can be further enhanced.

In addition, the neutral wires 47 extending along the circumferential direction of the stator 22 are twisted together in the plurality of first fixing portions 56 of the three-phase motor 6 in Examples 1 and 2, so that the plurality of neutral wires are fixed. 47 are fixed to each other. Thereby, the plurality of neutral wires 47 can be easily fixed to the stator 22 .

Further, the plurality of first fixing portions 56 of the three-phase motor 6 in Examples 1 and 2 are arranged close to each other in the circumferential direction of the stator 22 . This makes it easier to twist together the multiple sets of neutral wires 47 extending from the first fixing portion 56, so that the second fixing portion 57 can be easily formed. Moreover, it becomes possible to easily align and cut the lengths of a plurality of sets of neutral wires 47 from the first fixing portion 56 to the neutral point 51 .

Further, in the plurality of first fixing portions 56 of the three-phase motor 6 in Examples 1 and 2, the neutral wire 47 extending toward one side in the circumferential direction of the upper insulator 24 and the neutral wire 47 extending in the circumferential direction of the upper insulator 24 , and the neutral wire 47 extending toward the other side are twisted and fixed to each other. Thereby, the neutral wire 47 can be easily fixed to the upper insulator 24 .

Although the present embodiment is applied to the rotary compressor, it is not limited to the rotary compressor and may be applied to the scroll compressor. In this embodiment, the first fixing portion 56 is formed by twisting a plurality of neutral wires 47, and the second fixing portion 57 is formed by twisting a plurality of pairs of neutral wires 47. However, the first fixing portion 56 and the second fixing portion 57 may be formed by a fixing member such as a binding tool. Also, the winding procedure of the winding wire 46 is not limited to the present embodiment, and for example, one winding wire may be wound for each tooth.

1 compressor 3 shaft (rotating shaft)
5 compression unit 6 three-phase motor 21 rotor 22 stator 24 upper insulator (insulator)
32-1 First stator core teeth (teeth)
32-2 Second stator core teeth (teeth)
32-3 3rd Stator Core Teeth (Teeth)
32-4 No. 4 stator core teeth (teeth)
32-5 5th Stator Core Teeth (Teeth)
41 outer wall portion 44 slit (notch)
45 winding part 46 (46-U1 to 46-U3) multiple U-phase windings 46 (46-V1 to 46-V3) multiple V-phase windings 46 (46-W1 to 46-W3) multiple W-phases Winding 47 (47-U1 to 47-U3) Multiple U-phase neutral wires 47 (47-V1 to 47-V3) Multiple V-phase neutral wires 47 (47-W1 to 47-W3) Multiple W-phase Neutral line 48-U1 to 48-U3 Multiple U-phase power lines 48-V1 to 48-V3 Multiple V-phase power lines 48-W1 to 48-W3 Multiple W-phase power lines 49-U1 First U-phase crossover wire Part 49-U2 2nd U-phase crossover wire part 49-V1 1st V-phase crossover wire part 49-V2 2nd V-phase crossover wire part 49-W1 1st W-phase crossover wire part 49-W2 2nd W-phase crossover wire part 51 (51- 1 to 51-3) Neutral point 56 First fixed part 57 Second fixed part 52 (52-1) First splice terminal (connecting member)
52 (52-2) Second splice terminal (connection member)
52 (52-3) Third splice terminal (connection member)
58 Insulating tube (insulating member)
G Gap

Claims (9)

a motor having a rotor and a stator that generates a magnetic field that rotates the rotor;
a compression unit that compresses the refrigerant by rotating the rotating shaft of the rotor;
The stator is
a plurality of teeth;
a winding portion wound around each of the plurality of teeth; a neutral wire provided on one end side of the winding portion; and a power wire provided on the other end side of the winding portion. a plurality of windings;
a plurality of neutral points electrically connected via connecting members to each of the three neutral wires corresponding to each of the three phases ;
a plurality of first fixing portions in which the three neutral wires are fixed to each other with respect to the stator at a position closer to the winding portion than the plurality of neutral points; and at each of the plurality of neutral points. a second fixing part in which a plurality of sets of connected neutral wires are twisted into a bundle and fixed to each other;
The compressor , wherein the second fixing portion is inserted into one gap between the adjacent winding portions among the plurality of winding portions. 2. The compressor according to claim 1, wherein said plurality of first fixing portions are provided adjacent to each other in the circumferential direction of said stator . Further comprising insulators fixed to both ends of the stator,
In the plurality of first fixing portions, the three neutral wires routed in the circumferential direction of the insulator are fixed to each other.
A compressor according to claim 1 or 2 . The plurality of first fixing portions are provided at positions facing the winding portion adjacent to the gap in the circumferential direction of the insulator.
A compressor according to claim 3 . The second fixing part is covered with an insulating member,
A compressor according to any one of claims 1 to 4 . Further comprising insulators fixed to both ends of the stator,
The insulator has a notch that allows communication between the outer peripheral side of the insulator and the winding portion,
The second fixing portion is inserted into the gap between the adjacent winding portions through the notch from the outer peripheral side of the insulator.
A compressor according to any one of claims 1 to 5 . In the plurality of first fixing portions, the three neutral wires are fixed to each other by twisting the neutral wires extending along the circumferential direction of the stator.
A compressor according to any one of claims 1 to 6 . the motor is a three-phase motor,
Each of the three neutral wires is joined by crimping via the connecting member,
A compressor according to any one of claims 1 to 7. In the plurality of first fixing portions, the neutral wire extending toward one side in the circumferential direction of the insulator and the neutral wire extending toward the other side in the circumferential direction are twisted with each other. fixed by
A compressor according to claim 3 .

Images