Motor, compressor, and air conditioner

Abstract

To provide a technique for suppressing influences caused by the presence of a space communicating in a radial direction in a protruding portion, which protrudes from a stator core, in a stator coil.SOLUTION: A compressor 100 comprises a compression mechanism part 120 and a motor 200 which are stored in a sealed container 110. A stator 300 of the motor 200 includes a stator coil 340 wound around a plurality of teeth of a stator core 310. The stator coil 340 includes a first protruding portion 340A and a second protruding portion 340B protruding from the stator core 310 to a first side and a second side in an axial direction. At least outside of the first protruding portion 340A, a first enclosure wall 350 is provided which extends without a gap in the axial direction and a circumferential direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric motor used in a compressor or an air conditioner. [Background technology]

[0002] Air conditioners (known as "air conditioners"), which adjust the temperature and humidity of indoor air, use compressors that have a compression mechanism and an electric motor that drives the compression mechanism (known as "electric compressors").

[0003] A typical compressor is composed of a compressor mechanism, an electric motor that drives the compression mechanism, and a sealed container that houses the compression mechanism and the electric motor. The electric motor is composed of a stator and a rotor. The stator includes a stator core, and the rotor includes a rotor core. The electric motor is housed in the sealed container with the outer peripheral surface of the stator core abutting against the inner peripheral surface of the sealed container. Also, as a compressor, a vertical compressor in which a compression mechanism and an electric motor are arranged side by side in the vertical direction is known, for example, a vertical compressor in which the electric motor is arranged above the compression mechanism. In such a vertical compressor, the refrigerant sucked in from the suction port is compressed by the compression mechanism. The refrigerant compressed in the compression mechanism flows through a gap between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor core and a refrigerant passage provided in the electric motor, and is discharged from a discharge port. A stator passage is usually used as the refrigerant passage. The stator passage includes at least one of a first stator passage formed between the outer peripheral surface of the stator core and the inner peripheral surface of the sealed container, and a second stator passage formed in the stator core. Note that a rotor passage formed in the rotor core may also be used. An oil reservoir is provided below the compression mechanism to store lubricating oil for lubricating the sliding parts of the compression mechanism, etc. Therefore, a mixed gas containing the compressed refrigerant and the lubricating oil is discharged from the discharge port.

[0004] Here, the lubricating oil is separated from the mixed gas by contacting the walls forming the refrigerant passage, the inner peripheral surface of the sealed container, etc. Then, the lubricating oil separated from the mixed gas falls through the refrigerant passage and gaps and is returned to the oil reservoir. This reduces the amount of lubricating oil contained in the mixed gas discharged from the discharge port. In other words, it is possible to suppress a reduction in the amount of lubricating oil stored in the oil reservoir in the sealed container. In addition, an accumulator is provided to suppress a decrease in the amount of lubricating oil stored in the oil reservoir in the sealed container. The accumulator separates the lubricating oil from the mixed gas discharged from the discharge port. The lubricating oil separated from the mixed gas by the accumulator is returned to the oil reservoir in the sealed container.

[0005] Conventionally, a technique for enhancing the effect of separating lubricating oil from a mixed gas in a sealed container is disclosed, for example, in Japanese Patent Application Laid-Open No. 2009-144581 (Patent Document 1). Japanese Patent Application Laid-Open No. 2009-144581 discloses a technique for providing an oil separator on the upper side of a stator core against which the mixed gas passing through a refrigerant passage can collide. When the mixed gas collides with the oil separator, the velocity of the mixed gas decreases, and the lubricating oil is separated from the mixed gas. The lubricating oil separated from the mixed gas by the oil separator falls through the refrigerant passage and is returned to an oil sump. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-144581 A Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, there has been a demand for smaller compressors used in air conditioners. Accordingly, there has also been a demand for smaller electric motors used in compressors. When electric motors are made smaller, the stator core constituting the stator and the rotor core constituting the rotor also become smaller. In this case, if a stator passage or rotor passage is provided, the passage through which the magnetic flux flows (called the "magnetic path") becomes narrower, and the efficiency of the electric motor decreases. In order to prevent the magnetic path from narrowing, it is also possible to form the first stator passage by a concave surface formed on the inner peripheral surface of the sealed container, instead of by a cutout surface formed on the outer peripheral surface of the stator core. However, using this method increases the outer diameter of the sealed container. In this way, when the refrigerant passages provided in the motor are eliminated (or the cross-sectional area of ​​the refrigerant passages is reduced) due to the downsizing of the compressor, the amount of lubricating oil contained in the mixed gas returned to the oil reservoir through the refrigerant passages in the sealed container decreases. In this case, the amount of lubricating oil contained in the mixed gas returned to the oil reservoir largely depends on the amount of lubricating oil returned from the accumulator.

[0008] On the other hand, the stator coil wound around each tooth of the stator core includes a first protruding portion and a second protruding portion protruding upward and downward from the stator core along the axial direction. The first protruding portion and the second protruding portion include spaces that communicate in the radial direction at appropriate locations along the circumferential direction. The presence of a space that is radially connected between the first protruding portion and the second protruding portion disturbs the flow of the mixed gas along the axial direction. For example, a part of the mixed gas flows radially through this space. This reduces the amount of lubricating oil contained in the mixed gas discharged from the discharge port. In other words, the amount of lubricating oil returned from the accumulator is reduced. The present invention was devised in consideration of these points, and aims to suppress the effects of the radially communicating space contained in the protruding portion of the stator coil, which protrudes from the stator core in the axial direction. [Means for solving the problem]

[0009] The first invention relates to an electric motor used in a compressor. The electric motor of the first aspect of the present invention includes a stator and a rotor. The stator includes a stator core and a stator coil. The stator core is formed in a cylindrical shape extending in the axial direction and has a yoke extending in the circumferential direction and a number of teeth spaced apart from each other along the circumferential direction and extending radially inward (in the axial direction) from the yoke. The stator coil is wound around each of the teeth and includes a first protruding portion and a second protruding portion protruding from the stator core along the axial direction to a first side and a second side. A surrounding wall is provided on the outer side of at least one of the first protruding portion and the second protruding portion, and extends without any gaps in the axial and circumferential directions. The surrounding wall can close the radially communicating space of at least one of the protruding parts, thereby preventing the influence of the radially communicating space included in at least one of the protruding parts, and can prevent an electrical component arranged near at least one of the protruding parts from contacting at least one of the protruding parts. In the electric motor of the first aspect of the invention, it is possible to suppress the influence of the radially communicating space included in the protruding portion of the stator coil protruding from the stator core in the axial direction. In a variant of the first aspect of the invention, the stator includes a first electrical insulator assembly and a second electrical insulator assembly. The first electrical insulator assembly has a first outer wall portion extending along the axial direction and the circumferential direction, and a plurality of first body portions arranged at positions spaced apart along the circumferential direction and extending radially inward from the first outer wall portion. The first electrical insulator assembly is arranged on a first side of the stator core along the axial direction, such that the first outer wall portion faces the yoke, and each of the plurality of first body portions faces each of the plurality of teeth. The second electrical insulator assembly has a second outer wall portion extending along the axial direction and the circumferential direction, and a plurality of second body portions arranged at positions spaced apart along the circumferential direction and extending radially inward from the second outer wall portion. The second electrical insulator assembly is arranged on a second axial side of the stator core such that the second outer wall portion faces the yoke and each of the second body portions faces each of the teeth. The stator coil is wound around each of the plurality of teeth, with a first body portion and a second body portion disposed on a first side and a second side along the axial direction. At least one of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly has at least one notch formed therein that opens to the outer peripheral surface and the inner peripheral surface of the outer wall portion. An enclosure wall is provided on the outside of at least one of the outer wall portions. In this embodiment as well, it is possible to suppress the influence of the radially communicating space included in the protruding portion of the stator coil protruding from the stator core in the axial direction. In a different embodiment of the first aspect of the invention, the surrounding wall is formed of a resin annular member that shrinks when heat is applied thereto. In this embodiment, the surrounding wall can be provided easily and reliably. A second invention relates to a compressor including an electric motor. The compressor of the second invention includes a compression mechanism, an electric motor that drives the compression mechanism, and a sealed container. The compression mechanism and the electric motor are housed in the sealed container. The sealed container includes an intake port and a discharge port. An oil reservoir that stores lubricating oil is provided in the sealed container. The compressor is configured such that a refrigerant drawn through the intake port is compressed by the compression mechanism and discharged from the discharge port. The electric motor used is the one described above. In the compressor of the second invention, it is possible to suppress a reduction in the amount of lubricating oil contained in the mixed gas discharged from the discharge port due to a radially communicating space contained in the protruding portion of the stator coil that protrudes axially from the stator core. In another embodiment of the second aspect of the present invention, the electric motor is arranged so that the axial direction is parallel (including "approximately parallel") to the vertical direction. The electric motor and the compression mechanism are arranged side by side along the vertical direction. The oil reservoir is provided below the compression mechanism. In this embodiment, the compressor can be configured as a vertical compressor. In a different embodiment of the second aspect of the invention, the electric motor is disposed above the compression mechanism. The oil reservoir is disposed below the compression mechanism. The first protruding portion protrudes above the stator core, and the second protruding portion protrudes below the stator core. The surrounding wall is provided at least on the outside of the first protruding portion. This embodiment can be configured as a vertical compressor in which the electric motor is disposed above the compression mechanism. In a different embodiment of the second aspect of the present invention, the surrounding wall is formed of a resin annular member that shrinks when heat is applied thereto. In this embodiment, the surrounding wall can be provided easily and reliably. The third invention relates to an air conditioner including a compressor. In the air conditioner of the third invention, the above-mentioned compressor is used as the compressor. The air conditioner of the third invention has the same effects as the electric motor and compressor described above. Effect of the Invention

[0010] By using the electric motor, compressor, and air conditioner of the present invention, it is possible to suppress the effects of the radially communicating space contained in the protruding portion of the stator coil that protrudes axially from the stator core. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a cross-sectional view of the compressor of the first embodiment. [Diagram 2] 2 is an enlarged view of a portion of a stator that constitutes the electric motor of the first embodiment. FIG. [Diagram 3]FIG. 2 is a perspective view of a stator that constitutes the electric motor of the first embodiment. [Figure 4] 2 is a perspective view of a surrounding wall included in a stator constituting the electric motor of the first embodiment. FIG. [Diagram 5] FIG. 2 is a perspective view of a stator that constitutes the electric motor of the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view of a compressor according to a second embodiment. [Figure 7] FIG. 11 is an enlarged view of a portion of a stator that constitutes an electric motor according to a second embodiment. [Figure 8] FIG. 11 is a perspective view of a stator that constitutes an electric motor according to a second embodiment. [Figure 9] FIG. 11 is a perspective view of a stator that constitutes an electric motor according to a second embodiment. [Figure 10] 10 is a cross-sectional view taken along line XX in FIG. 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification, the extending direction of the axis P is referred to as the “axial direction.” The axis P corresponds to the rotation center line of the rotor (rotation shaft) in a state in which the rotor is rotatably disposed on the stator. Moreover, the circumferential direction about the axis P is referred to as the "circumferential direction." Moreover, the extension direction of a line passing through the axis P when viewed from one side in the extension direction of the axis is referred to as the "radial direction." The term "radially inner" refers to the side of the axis P along the radial direction, and the term "radially outer" refers to the side opposite the axis P along the radial direction. In addition, with respect to the electrical insulator assembly (first electrical insulator assembly, second electrical insulator assembly) and the surrounding wall (first surrounding wall, second surrounding wall), the terms "axial direction", "circumferential direction", and "radial direction" refer to the "axial direction", "circumferential direction", and "radial direction" when they are arranged on the stator core.

[0013] First, a first embodiment of a compressor of the present invention will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view of a compressor 100 of the first embodiment. The electric motor 200 constituting the compressor 100 of the first embodiment is the first embodiment of the electric motor of the present invention.

[0014] The compressor 100 includes a sealed container 110, a compression mechanism 120, an accumulator 130, an electric motor 200, and the like. The sealed container 110 has a sealed container inner circumferential surface 111. The sealed container inner circumferential surface 111 defines an inner space of the sealed container. The compression mechanism 120 and the electric motor 200 are housed in the space inside the sealed container. The compressor 100 of this embodiment is configured as a vertical compressor in which the electric motor 200 and the compression mechanism 120 are arranged side by side in the vertical direction. Furthermore, the compressor is configured as a vertical compressor in which the electric motor 200 is arranged above the compression mechanism 120. Note that the compressor can also be configured as a vertical compressor in which the electric motor 200 is arranged below the compression mechanism 120. In the sealed container 110, an intake port 112 is provided below the electric motor 200, and an exhaust port 113 is provided above the electric motor 200. In addition, an oil reservoir 126 for storing lubricating oil to be supplied to sliding parts (e.g., bearings 124, 125) of the compression mechanism 120 is provided at the bottom of the sealed container 110 (below the compression mechanism 120).

[0015] The compression mechanism 120 compresses a refrigerant that transfers thermal energy. In this embodiment, a natural refrigerant with a small global warming potential (GWP), particularly carbon dioxide, which is neither toxic nor flammable, is used as the refrigerant. Of course, various refrigerants other than carbon dioxide can be used. When carbon dioxide is used as the refrigerant, the temperature and pressure inside the sealed container 110 become higher than when a fluorocarbon-based refrigerant or the like is used. For this reason, a lubricating oil with a high viscosity is used as the lubricating oil.

[0016] In this embodiment, a rotary type compression mechanism is used as the compression mechanism 120. Of course, compression mechanisms of various other configurations can be used. The compression mechanism 120 is composed of a cylinder 121, an eccentric rotor 122 that is rotated by a rotary shaft 440, and a compression chamber 123. The rotary shaft 440 is rotatably supported by bearings 124 and 125. When the eccentric rotor 122 of the compression mechanism 120 rotates due to the rotation of the rotary shaft 440 , the refrigerant sucked from the suction port 112 is compressed (pressurized) in the compression chamber 123 . The refrigerant compressed by the compression mechanism 120 is mixed with the fine lubricating oil particles. Then, the mixed gas containing the compressed refrigerant and the fine lubricating oil particles flows through the gap 210 between the stator 200 and the rotor 400, and is discharged from the discharge port 113. The accumulator 130 separates the refrigerant and the lubricating oil contained in the mixed gas discharged from the discharge port 113. The refrigerant separated from the mixed gas in the accumulator 130 is returned to the compression mechanism unit 120 via the suction pipe 131 and the suction port 112. The lubricating oil separated from the mixed gas in the accumulator 130 is returned to the oil reservoir 126. By the rotation of the rotary shaft 440, the lubricating oil stored in the oil reservoir 126 is supplied to the sliding parts and the like of the compression mechanism part 120. The lubricating oil that has lubricated the sliding parts and the like of the compression mechanism part 120 is returned to the oil reservoir 126. The mixed gas that has flowed to the upper side of the electric motor 200 through the gap 210 of the electric motor 200 is cooled when it comes into contact with the inner circumferential surface 111 of the sealed container, etc. When the mixed gas is cooled, the lubricating oil contained in the mixed gas is separated. A part of the separated lubricating oil flows (falls) downward through the gap 210 of the electric motor 200 and is returned to the oil reservoir 126. The rest of the separated lubricating oil adheres to the inner circumferential surface 111 of the sealed container, etc.

[0017] Next, the configuration of the electric motor 200 will be described with reference to Figs. 2 to 5. Fig. 2 is an enlarged view of a portion of a stator 300 constituting the electric motor 200. Fig. 3 is a perspective view of the stator 300 in a state in which the first surrounding wall 350 and the second surrounding wall 360 are not arranged. Fig. 4 is a perspective view of the first surrounding wall 350 and the second surrounding wall 360. Fig. 5 is a perspective view of the stator 300 in a state in which the first surrounding wall 350 and the second surrounding wall 360 are arranged. As the electric motor 200 of this embodiment, a permanent magnet electric motor in which permanent magnets are inserted into magnet insertion holes formed in a rotor is used. The electric motor 200 is composed of a stator 300, a rotor 400, and the like.

[0018] The stator 300 includes a stator core 310 and a stator coil 340 . The stator core 310 is composed of a laminated body in which a plurality of plate-shaped electromagnetic steel sheets are stacked. The stator core 310 is formed in a cylindrical shape extending in the axial direction (X direction), and has a stator core outer peripheral surface 311 and a stator core inner peripheral surface 316. The stator core inner peripheral surface 316 forms a stator core inner space with the axis P as its center line. The rotor 400 (rotor core 410) is rotatably arranged in the stator core inner space. In this embodiment, the stator core 310 is arranged so that the axial direction (X direction) is parallel (including "approximately parallel") to the vertical direction. In addition, the stator core 310 has a stator core end face 310A on a first side (X1 side) (in this embodiment, the upper side) along the axial direction, and has a stator core end face 310B on a second side (X2 side) (in this embodiment, the lower side) along the axial direction. As shown in FIG. 2, the stator core 310 has a yoke 312 and a plurality of teeth 313 when viewed from one side in the axial direction. The yoke 312 extends in the circumferential direction. The teeth 313 are arranged at positions spaced apart from each other along the circumferential direction, and extend from the yoke 312 in the radial direction (toward the axis P). The teeth 313 have a teeth base 314 and a teeth tip 315. The teeth base 314 extends from the yoke 312 in the radial direction. The teeth tip 315 is provided at the tip of the teeth base 314 on the radial inner side (toward the axis P) and extends in the circumferential direction. A teeth tip surface 316 is formed on the radial inner side of the teeth tip 315. The teeth tip surface 316 forms a stator core inner space in which the rotor 400 (rotor core 410) is arranged. In other words, the teeth tip surface 316 forms the inner peripheral surface of the stator core. A slot 317 is formed by circumferentially adjacent teeth 313 . In this embodiment, the stator core 310 is disposed in the space inside the sealed container with the outer circumferential surface 311 of the stator core in contact with the inner circumferential surface 111 of the sealed container.

[0019] The stator coil 340 is wound around each of the teeth 313. In this embodiment, the stator coil 340 is wound around each of the teeth 313 by a distributed winding method. Stator coil 340 includes an insertion portion inserted into slot 317, and first and second protruding portions 340A and 340B protruding from stator core 310. First protruding portion 340A protrudes from stator core 310 to a first side (arrow X1 side: upper side) along the axial direction. Second protruding portion 340B protrudes from stator core 310 to a second side (arrow X2 side: lower side) along the axial direction. The ends of the conductors constituting the stator coils of each phase are drawn out as power supply connection terminals. For example, the ends of the conductors constituting the U-phase stator coil, V-phase stator coil, and W-phase stator coil are drawn out as power supply connection terminals 340U1, 340V1, and 340W1.

[0020] The rotor 400 includes a rotor core 410 and a rotor shaft 440 . Rotor core 410 is composed of a laminated body of multiple plate-shaped electromagnetic steel sheets. Rotor core 410 is formed in a cylindrical shape extending in the axial direction (X direction), and has rotor core outer peripheral surface 411 and rotor core inner peripheral surface 412. Rotor core inner peripheral surface 412 forms a rotor core inner space. The rotating shaft 440 is inserted into the space inside the rotor core by press fitting or the like. The rotor core 410 is rotatably disposed within the stator core inner space such that the center line of the rotation shaft 440 coincides with the axis P (including "approximately coincident"). By disposing rotor core 410 in the stator core inner space, gap 210 is formed between stator core inner peripheral surface (tooth tip surface) 316 and rotor core outer peripheral surface 411. In addition, end plates 420 are arranged on both sides in the axial direction with the plurality of electromagnetic steel sheets stacked together. Then, crimp pins 430 are inserted into crimp pin insertion holes formed in each of the electromagnetic steel sheets and the end plates 420, thereby forming a laminate with each of the electromagnetic steel sheets aligned. Although not shown, a plurality of magnet insertion holes into which permanent magnets are inserted are formed in the rotor core 410. The number and shapes of the magnet insertion holes and the permanent magnets are set appropriately.

[0021] 3, the first protruding portion 340A and the second protruding portion 340B of the stator coil 340 include spaces 341 that communicate in the radial direction at appropriate locations along the circumferential direction. The spaces 341 are defined as spaces in which no conductor wire constituting the stator coil 340 exists. That is, when the stator coil 340 (more specifically, the conductor wire constituting the stator coil 340) is wound around each tooth 313, the spaces 341 that communicate in the radial direction and do not include any conductor wire are formed on the first side and the second side along the axial direction of the stator core 310. Space 341 included in first protruding portion 340A and second protruding portion 340B disturbs the flow of mixed gas containing refrigerant and lubricant through gap 210 of motor 200. For example, a part of the mixed gas flows into space 341 included in second protruding portion 340B, thereby reducing the amount of lubricant contained in the mixed gas flowing through gap 210 of motor 200. In addition, a part of the mixed gas that has passed through gap 210 of motor 200 flows into space 341 included in first protruding portion 340A, thereby reducing the amount of lubricant contained in the mixed gas discharged from discharge port 113.

[0022] In this embodiment, in order to suppress the influence of the space 341 contained in the first protruding portion 340A and the second protruding portion 340B, a first surrounding wall 260 is arranged outside the first protruding portion 340A, and a second surrounding wall 360 is arranged outside the second protruding portion 340B. The configuration of the first surrounding wall 350 will be described with reference to FIG. The first surrounding wall 350 is configured with an annular member 351 capable of surrounding the outside of the first protruding portion 340A. The annular member 351 extends without gaps in the circumferential and axial directions about a center point 350a, and has an annular member inner peripheral surface 351a and an annular member outer peripheral surface 351b. The annular member 351 is made of a material having insulating properties. As the material having insulating properties, various known materials can be used. As a method for disposing the annular member 351 on the outside of the first protruding portion 340A, various methods can be used. In this embodiment, the annular member 351 is formed as a resin annular member by a resin that shrinks when heat is applied. As the resin that shrinks when heat is applied, various known resins can be used. The thickness of the annular member 351 is set within a range of 0.07 mm to 0.5 mm. In this embodiment, heat is applied to the annular member 351 in a state in which the annular member 351 is disposed outside the first protruding portion 340A. The application of heat causes the annular member 351 to shrink. As the annular member 351 shrinks, the annular member 351 comes into close contact with the entire outside of the first protruding portion 340A. This allows the annular member 351 (first surrounding wall 350) to be easily and firmly disposed outside the first protruding portion 340A. The annular member 351 is brought into close contact with the entire outside of the first protruding portion 340A, thereby blocking the radially outer side of the space 341 included in the first protruding portion 340A. By closing space 341 included in first protruding portion 340A, the flow of the mixed gas along the axial direction that has passed through gap 210 of motor 200 can be prevented from being disturbed by space 341 included in first protruding portion 340A. That is, the amount of mixed gas that flows from gap 210 of motor 200 to discharge port 113 is reduced. This makes it possible to suppress a reduction in the amount of lubricating oil included in the mixed gas discharged from discharge port 113.

[0023] 4, the second surrounding wall 360, like the first surrounding wall 350, is configured with an annular member 361. The annular member 361 is formed from the same material as the annular member 351. The shape and size of the annular member 361 constituting the second surrounding wall 360 may be the same as or different from the shape and size of the annular member 351 constituting the first surrounding wall 350. By disposing the annular member 361 on the outside of the second protruding portion 340B, the radial outside of the space 341 included in the second protruding portion 340B is blocked. This makes it possible to prevent the flow of the mixed gas along the axial direction into the gap 210 of the electric motor 200 from being disturbed by the space 341 included in the second protruding portion 340B. In other words, it is possible to suppress a decrease in the amount of lubricating oil included in the mixed gas flowing through the gap 210 of the electric motor 200.

[0024] In this embodiment, a first surrounding wall 350 is provided on the outside of the first protruding portion 340A, and a second surrounding wall 360 is provided on the outside of the second protruding portion 340B. This makes it possible to prevent the axial flow of the mixed gas containing the refrigerant and the lubricant from being disturbed by the space 241 included in the first protruding portion 340A and the space 241 included in the second protruding portion 340B. By increasing the amount of lubricant contained in the mixed gas discharged from the discharge port, the amount of lubricant returning from the accumulator 130 can be increased. Moreover, it is possible to prevent the first protruding portion 340A and the second protruding portion 340B from coming into contact with other electric components, which would cause insulation failure. Although a surrounding wall is provided on the outside of each of the first protruding portion 340A and the second protruding portion 340B, a surrounding wall may be provided on the outside of at least one of the protruding portions. In this case, it is preferable to provide a surrounding wall on the outside of the first protruding portion 340A.

[0025] Next, a second embodiment of the compressor of the present invention will be described with reference to Fig. 6. Fig. 6 is a cross-sectional view of a compressor 500 of the second embodiment. The electric motor 600 constituting the compressor 500 of the second embodiment is the second embodiment of the electric motor of the present invention.

[0026] The compressor 500 of the second embodiment includes a sealed container 510, a compression mechanism 520, an electric motor 600, and an accumulator 530, similar to the compressor 100 of the first embodiment. The sealed container 510, compression mechanism 520, and accumulator 530 of the compressor 500 of the second embodiment have the same configurations as the sealed container 110, compression mechanism 120, and accumulator 130 of the compressor 100 of the first embodiment, so their explanations are omitted. Motor 600 differs from motor 200 described above in that stator 700 includes a first electrical insulator assembly 720 and a second electrical insulator assembly 730 .

[0027] The configuration of the electric motor 600 will be described with reference to Figs. 7 to 10. Fig. 7 is an enlarged view of a portion of the stator 700 constituting the electric motor 600. Fig. 8 is a perspective view of the stator 700 in a state in which the first surrounding wall 750 and the second surrounding wall 760 are not provided. Fig. 9 is a perspective view of the stator 700 in a state in which the first surrounding wall 750 and the second surrounding wall 760 are provided. Fig. 10 is a cross-sectional view of Fig. 9 as viewed from the direction of the arrow XX. In this embodiment, a permanent magnet motor is used as the electric motor 600. The electric motor 600 is composed of a stator 700, a rotor 800, and the like. Rotor 800 has the same configuration as rotor 400 of electric motor 200 described above, and therefore a description thereof will be omitted.

[0028] The stator 700 includes a stator core 710 , a first electrical insulator assembly 720 , a second electrical insulator assembly 730 , and a stator coil 740 . The stator core 710 is configured similarly to the stator core 310 described above. The stator core 710 is formed in a cylindrical shape extending in the axial direction, and has a stator core outer peripheral surface 711 and a stator core inner peripheral surface 716 . Furthermore, the stator core 710 has a stator core end surface 710A and a stator core end surface 710B on a first side (upper side) and a second side (lower side) along the axial direction. 7, the stator core 710 has a yoke 712 and a plurality of teeth 713. The teeth 713 have a teeth base portion 714 and a teeth tip portion 715. A teeth tip surface 716 is formed on the teeth tip portion 715. The teeth tip surface 716 forms an inner space of the stator core. The stator core 710 is disposed in the space inside the sealed container with the stator core outer peripheral surface 711 in contact with the sealed container inner peripheral surface 511 .

[0029] The first electrical insulator assembly 720 is made of a resin having insulating properties. As shown in FIG. 8, the first electrical insulator assembly 720 has a first outer wall portion 721, a plurality of first inner wall portions 722, and a plurality of first body portions 723. The first outer wall portion 721 extends along the axial direction and the circumferential direction. The first inner wall portions 722 are disposed at positions spaced apart along the circumferential direction radially inward (on the axis p side) from the first outer wall portion 721, and extend along the axial direction and the circumferential direction. The first body portions 723 are provided between the first outer wall portion 721 and the first inner wall portions 722, and extend along the radial direction. The first outer wall portion 721 has a first outer wall portion outer peripheral surface 721a and a first outer wall portion inner peripheral surface 721b. Grooves 721A-721C extending in the circumferential direction are formed in the first outer wall outer peripheral surface 721a (see FIG. 10). Conductive wires 740u, 740v, 740w (called "crossover wires") constituting the U-phase, V-phase, and W-phase coils that are routed along the first outer wall outer peripheral surface 721a are inserted into the grooves 721A-721C. Grooves 721A-721C prevent contact between the conductive wires 740u, 740v, 740w. Further, a notch 721D opening to the first outer wall outer peripheral surface 721a and the first outer wall inner peripheral surface 721b is formed in the first outer wall portion 721. The notch 721D is used when the conducting wires 740u, 740v, 740w are passed across the first outer wall portion 721 from the radially inner side to the radially outer side or from the radially outer side to the radially inner side. The first electrical insulator assembly 720 is disposed on a first side (stator core end face 710A side) along the axial direction of the stator core 710 such that the first outer wall portion 721, each of the first body portions 723, and each of the first inner wall portions 722 face the yoke 712, each of the tooth base portions 714, and each of the tooth tip portions 715, respectively (see FIG. 7). Note that the first outer wall portion 721 and each of the first body portions 723 may also be disposed to correspond to the yoke 712 and each of the teeth 713, respectively.

[0030] Similar to the first electrical insulator assembly 720 , the second electrical insulator assembly 730 has a second outer wall portion 731 , a plurality of second inner wall portions 732 , and a plurality of second body portions 733 . The second electrical insulator assembly 730 is disposed on the second side (stator core end face 710B side) along the axial direction of the stator core 710, such that the second outer wall portion 731, the second body portions 733, and the second inner wall portions 722 face the yoke 712, the tooth base portions 714, and the tooth tip portions 715, respectively. Note that the second outer wall portion 731 and the second body portions 733 may be disposed to correspond to the yoke 712 and the teeth 713, respectively. The first electrical insulator assembly 720 can also be used (shared) as the second electrical insulator assembly 730 . In addition, on the second side of the stator core 710 along the axial direction, if the conductor wire is not routed along the second outer wall outer surface 731a, the grooves in the second outer wall outer surface 731a and the notches in the second outer wall 731 can be omitted.

[0031] The stator coil 740 is wound around each tooth 713, with the first body 723 of the first electrical insulator assembly 720 disposed on a first axial side and the second body 733 of the second electrical insulator assembly 730 disposed on a second axial side. In this embodiment, the stator coil 740 is wound around each of the teeth 713 using a concentrated winding method.

[0032] In this embodiment, as in the first embodiment, as shown in FIG. 8, the first protruding portion 740A and the second protruding portion 740B of the stator coil 740 include a radially communicating space 741 at an appropriate location along the circumferential direction. Furthermore, a notch 721D is formed in the outer wall portion 721 of the first electrical insulator assembly 720. A notch 731D (not shown) is formed in the outer wall portion 731 of the second electrical insulator assembly 730. Therefore, the space 741 included in the first protruding portion 740A and the notch 721D formed in the outer wall portion 721 of the first electrical insulator assembly 720 communicate in the radial direction. Also, the space 741 included in the second protruding portion 740B and the notch 731D formed in the outer wall portion 731 of the second electrical insulator assembly 730 communicate in the radial direction. In this case, as described above, the flow of the mixed gas containing the refrigerant and the lubricant along the axial direction is disturbed by the space 741 included in the first protruding portion 740A and the notch 721D formed in the outer wall portion 721 of the first electrical insulator assembly 720, and by the space 741 included in the second protruding portion 740B and the notch 731D formed in the outer wall portion 731 of the second electrical insulator assembly 730.

[0033] In this embodiment, a first surrounding wall 750 is disposed on the outside of a first outer wall portion 721 of a first electrical insulator assembly 720, which is disposed on the outside of a first protruding portion 740A. Also, a second surrounding wall 760 is disposed on the outside of a second outer wall portion 731 of a second electrical insulator assembly 730, which is disposed on the outside of a second protruding portion 740B. The first surrounding wall 750 and the second surrounding wall 760 are formed of annular members 751 and 761, similar to the first surrounding wall 350. The annular members 751 and 761 are formed of the same material as the annular member 351. By disposing an annular member 751 on the outside of the first outer wall portion 721 of the first electrical insulator assembly 720, the space 741 contained in the first protruding portion 740A is filled. This makes it possible to prevent the axial flow of the mixed gas that has passed through gap 610 of motor 600 from being disturbed by space 741 included in first protruding portion 740A. In other words, it is possible to prevent the amount of lubricating oil contained in the mixed gas discharged from discharge port 513 from decreasing. Furthermore, by disposing the annular member 761 on the outside of the second outer wall portion 731 of the second electrical insulator assembly 730, the space 741 included in the second protruding portion 740B is blocked. This makes it possible to prevent the flow of the mixed gas along the axial direction into gap 610 of motor 600 from being disturbed by space 741 included in second protruding portion 740B. In other words, it is possible to suppress a decrease in the amount of lubricating oil included in the mixed gas flowing through gap 610 of motor 600.

[0034] A first enclosure wall 750 is shown disposed on the outside of the first outer wall portion 721 of the first electrical insulator assembly 720 in FIG. 10, a first surrounding wall 750 is disposed radially outside the conductor wires 740a-740w inserted into the grooves 721A-721C formed in the outer peripheral surface 721a of the first outer wall portion of the first electrical insulator assembly 720. This makes it possible to prevent the conductor wires 740a-740w from coming into contact with other electrical components. Similarly, a second surrounding wall 760 is disposed radially outward of the conductor inserted into the groove formed in the outer circumferential surface of the second outer wall portion of the second electrical insulator assembly 730 .

[0035] In this embodiment, a first surrounding wall 750 is provided on the outside of a first outer wall portion 721 of the first electrical insulator assembly 720, and a second surrounding wall 760 is provided on the outside of a second outer wall portion 731 of the second electrical insulator assembly 730. This prevents the axial flow of the mixed gas containing the refrigerant and lubricant from being disturbed by space 741 contained in first protruding portion 740A or space 741 contained in second protruding portion 740B. In addition, it is possible to prevent the conductive wires introduced into the grooves formed in the first outer wall outer surface 721a of the first electrical insulator assembly 720 and the conductive wires introduced into the grooves formed in the second outer wall outer surface 731a of the second electrical insulator assembly 730 from coming into contact with other electrical components, which could result in poor insulation. Although surrounding walls are provided on the outside of the first outer wall portion 721 of the first electrical insulator assembly 720 and the outside of the second outer wall portion 731 of the second electrical insulator assembly 730, a surrounding wall may be provided on the outside of at least one of the outer walls. In this case, it is preferable to provide a surrounding wall on the outside of the first outer wall portion 721 of the first electrical insulator assembly 720.

[0036] The compressor of the present invention can be used in a variety of applications. For example, it can be used as a compressor for an air conditioner, which includes a home air conditioner, a commercial air conditioner, an in-vehicle air conditioner, and the like. Domestic air conditioners are used in ordinary homes, apartment buildings, etc. Commercial air conditioners are used in offices, stores, etc. Automotive air conditioners are used in automobiles, for example, eco-friendly cars such as electric vehicles (EVs), hybrid vehicles (HVs), and fuel cell vehicles (FCVs), which have low exhaust gas emissions.

[0037] The present invention can also be configured as follows. (Aspect 1) Equipped with a stator and a rotor, The stator includes a stator core and a stator coil. The stator core is formed in a cylindrical shape extending along an axial direction, and has a yoke extending along a circumferential direction and a plurality of teeth arranged at intervals along the circumferential direction and extending radially inward from the yoke, The stator coil is wound around each of the teeth of the electric motor, the stator coil includes a first protruding portion and a second protruding portion protruding from the stator core to a first side and a second side along the axial direction, an electric motor, characterized in that an enclosure wall is provided on the outside of at least one of the first protrusion portion and the second protrusion portion, the enclosure wall extending without a gap along the axial direction and the circumferential direction. (Aspect 2) The electric motor of aspect 1, the stator includes a first electrical insulator assembly and a second electrical insulator assembly; the first electrical insulator assembly has a first outer wall portion extending along the axial direction and the circumferential direction, and a plurality of first body portions arranged at positions spaced apart along the circumferential direction and extending radially inward from the first outer wall portion, and is arranged on the first side of the stator core along the axial direction such that the first outer wall portion faces the yoke and each of the plurality of first body portions faces each of the plurality of teeth; the second electrical insulator assembly has a second outer wall portion extending along the axial direction and the circumferential direction, and a plurality of second body portions disposed at positions spaced apart along the circumferential direction and extending radially inward from the second outer wall portion, and is disposed on the second side of the stator core along the axial direction such that the second outer wall portion faces the yoke and each of the second body portions faces each of the teeth, the stator coil is wound around each of the teeth, the first body portion and the second body portion being disposed on the first side and the second side along the axial direction, At least one of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly has at least one notch formed therein, the notch opening to an outer peripheral surface and an inner peripheral surface of the outer wall portion; The electric motor, wherein the surrounding wall is provided outside the at least one outer wall portion. (Aspect 3) The electric motor of aspect 1 or 2, The electric motor, wherein the surrounding wall is formed of an annular resin member that shrinks when heat is applied thereto. (Aspect 4) A compressor including a compression mechanism, an electric motor that drives the compression mechanism, and a sealed container, the compression mechanism and the electric motor being housed within the sealed container, the sealed container including an intake port and a discharge port, the sealed container being provided with an oil reservoir that stores lubricating oil, and a refrigerant drawn in through the intake port being compressed by the compression mechanism and discharged from the discharge port, A compressor, characterized in that the electric motor according to any one of aspects 1 to 3 is used as the electric motor. (Aspect 5) The compressor of aspect 4, The electric motor is disposed so that the axial direction is parallel to the vertical direction, The electric motor and the compression mechanism are arranged side by side along the vertical direction, The compressor according to claim 1, wherein the oil reservoir is provided below the compression mechanism. (Aspect 6) The compressor of aspect 5, The electric motor is disposed above the compression mechanism, the first protruding portion protrudes upward from the stator core, the second protruding portion protrudes downward from the stator core, The compressor, wherein the surrounding wall is provided outside at least the first protruding portion out of the first protruding portion and the second protruding portion. (Aspect 7) An air conditioner having a compressor, An air conditioner, wherein the compressor is any one of the compressors according to aspects 4 to 6.

[0038] The configuration of the present invention is not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. In the embodiment, a vertical compressor in which the electric motor is arranged above the compression mechanism has been described. However, the compressor of the present invention can also be configured as a vertical compressor in which the electric motor is arranged below the compression mechanism. In the embodiment, a vertical compressor has been described. However, the present invention can also be configured as a horizontal compressor in which the compression mechanism and the electric motor are arranged side by side in the horizontal direction (including "approximately horizontal direction"). The compression mechanism may have a variety of configurations. As the electric motor that drives the compression mechanism, electric motors of various configurations that include a stator and a rotor can be used. In the embodiment, a stator core having teeth including a tooth base and a tooth tip is used, but a stator core having teeth including only a tooth base can also be used. In this case, a first electrical insulator assembly (second electrical insulator assembly) having an outer wall portion and multiple body portions can be used. The shape of the surrounding wall and the material from which the surrounding wall is formed can be changed as appropriate. Each of the configurations described in the embodiments can be used alone, or multiple appropriately selected configurations can be used in combination. [Explanation of symbols]

[0039] 100, 500 Compressor 110, 510 Airtight container 111, 511 Inner surface of sealed container 112, 512 Intake 113, 513 outlet 120, 520 Compression mechanism 121, 521 cylinder 122, 522 Eccentric rotor 123, 523 Compression chamber 124, 125, 524, 525 bearings 126, 526 Oil Sump 130, 530 Accumulator 131, 531 Suction pipe 200, 600 electric motor 300, 700 stator 310, 710 stator core 310A, 310B, 710A, 710B Stator core end face 310a, 710a Stator core inner space 311, 711 Stator core outer surface 312, 712 York 313, 713 Teeth 314, 714 Teeth base 315, 715 Teeth tip 316, 716 Teeth tip surface 317, 717 Slots 340, 740 stator coil 340A, 340B, 740A, 740B protruding parts 340U1, 340V1, 340W1, 740U1, 740V1, 740W1 Power connection terminal 341, 741 space 350, 360, 750, 760 Enclosure wall 350a, 360a, 750a, 760a Annular member inner space 351, 361, 751, 761 Annular members 351a, 361a, 751a, 761a Inner peripheral surface of annular member 351b, 361b, 751b, 761b Outer circumferential surface of annular member 400 Rotor 410 Rotor Core 420 End plate 430 rivet pin 440 Rotational Axis 720, 730 Electrical Insulator Assembly 721 Exterior wall 721a Outer wall outer circumferential surface 721b Inner peripheral surface of outer wall 722 Inner wall 723 Torso 721A, 721B, 721C Groove 731D Notch

Claims

1. The rotor and stator are provided. The stator includes a stator core and a stator coil. The stator core is formed in a cylindrical shape extending along an axial direction, and has a yoke extending along a circumferential direction and a plurality of teeth arranged at intervals along the circumferential direction and extending radially inward from the yoke, The stator coil is wound around each of the teeth of the electric motor, the stator coil includes a first protruding portion and a second protruding portion protruding from the stator core to a first side and a second side along the axial direction, an electric motor, characterized in that an enclosure wall is provided on the outside of at least one of the first protruding portion and the second protruding portion, the enclosure wall extending without a gap along the axial direction and the circumferential direction.

2. 2. The electric motor according to claim 1, the stator includes a first electrical insulator assembly and a second electrical insulator assembly; the first electrical insulator assembly has a first outer wall portion extending along the axial direction and the circumferential direction, and a plurality of first body portions disposed at positions spaced apart along the circumferential direction and extending radially inward from the first outer wall portion, and is disposed on the first side of the stator core along the axial direction such that the first outer wall portion faces the yoke, and each of the plurality of first body portions faces each of the plurality of teeth, the second electrical insulator assembly has a second outer wall portion extending along the axial direction and the circumferential direction, and a plurality of second body portions disposed at positions spaced apart along the circumferential direction and extending radially inward from the second outer wall portion, and is disposed on the second side of the stator core along the axial direction such that the second outer wall portion faces the yoke and each of the second body portions faces each of the teeth, the stator coil is wound around each of the teeth, the first body portion and the second body portion being disposed on the first side and the second side along the axial direction, At least one of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly has at least one notch formed therein, the notch opening to an outer wall portion outer circumferential surface and an outer wall portion inner circumferential surface, The electric motor, wherein the surrounding wall is provided outside the at least one outer wall portion.

3. 3. The electric motor according to claim 1 or 2, The electric motor, wherein the surrounding wall is formed of an annular resin member that shrinks when heat is applied thereto.

4. A compressor comprising a compression mechanism, an electric motor that drives the compression mechanism, and a sealed container, the compression mechanism and the electric motor being housed within the sealed container, the sealed container including an intake port and a discharge port, an oil reservoir that stores lubricating oil being provided within the sealed container, and a refrigerant drawn in through the intake port is compressed by the compression mechanism and discharged from the discharge port, A compressor, comprising the electric motor according to claim 1 or 2 as the electric motor.

5. The compressor according to claim 4, The electric motor is disposed so that the axial direction is parallel to the vertical direction, The electric motor and the compression mechanism are arranged side by side along the vertical direction, The compressor according to claim 1, wherein the oil reservoir is provided below the compression mechanism.

6. The compressor according to claim 5, The electric motor is disposed above the compression mechanism, the first protruding portion protrudes upward from the stator core, the second protruding portion protrudes downward from the stator core, The compressor, wherein the surrounding wall is provided outside at least the first protruding portion out of the first protruding portion and the second protruding portion.

7. The compressor according to claim 4, The compressor, wherein the surrounding wall is formed of an annular resin member that shrinks when heat is applied.

8. An air conditioner having a compressor, 5. An air conditioner, comprising the compressor according to claim 4 as the compressor.

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