Insulating components, electric motors, compressors, and refrigeration cycle equipment

Abstract

The present invention provides an electric motor that can appropriately suppress the concentration of stress and heat generated in the coils in the stator, and disperse the stress and heat generated in the coils. [Solution] The electric motor comprises a rotor and a stator. The stator core of the stator has a yoke, teeth, slots, and insulating components. The insulating components cover the yoke and each of the multiple teeth, insulating them from the windings of the teeth. The insulating components comprise a yoke portion that covers the yoke and a teeth portion that covers each of the multiple teeth. The teeth portion has at least a covering portion that covers the circumferential side surface of each of the multiple teeth over its entire axial length in the direction in which the rotation axis of the stator extends. The covering portion has a protrusion at approximately the midpoint of its axial length that protrudes more than at other points.

Description

Technical Field

[0001] Embodiments of the present invention relate to an electric motor including a stator having a bobbin as an insulating component, a compressor including the electric motor, and a refrigeration cycle device including the compressor.

Background Art

[0002] For example, an electric motor used in a hermetic compressor includes a substantially cylindrical stator (hereinafter referred to as a stator) and a rotor (hereinafter referred to as a rotor) rotatably provided with respect to the stator. The stator has, for example, a stator core (hereinafter referred to as a stator core) and a winding (hereinafter referred to as a coil). The stator core is composed of a substantially cylindrical yoke and a plurality of teeth protruding radially inward from the yoke. The coils are wound around respective teeth arranged at predetermined intervals in the circumferential direction of the yoke.

[0003] For example, a pair of annular insulating components are arranged on both end faces in the axial direction of the stator core. The insulating component has a plurality of tooth portions that respectively cover the axial end faces and the side faces facing the slots of the teeth of the stator core, and a slot portion for accommodating the coil is formed between the tooth portions. The coil is wound around the tooth portion of the insulating component and passed through the slot portion of the insulating component. That is, in the stator core, the coil is wound around the teeth through the tooth portion of the insulating component and passed through the slot through the slot portion of the insulating component.

[0004] Stress due to the winding tension occurs in the coil wound around the tooth portion of the insulating component. The stress generated in the coil tends to concentrate at a location where it contacts, for example, a corner portion of the tooth portion of the insulating component (a portion covered by the tooth portion where the end face portion and the side face portion of the tooth of the stator core are connected). In addition, the portion of the coil that contacts the corner of the tooth portion is more likely to generate heat than other portions.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-259318 [Patent Document 2] Japanese Patent Publication No. 2023-129003 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The present invention was made based on this, and its purpose is to provide an electric motor that can appropriately suppress the concentration of stress and heat generated in the coils in the stator, and disperse the stress and heat generated in the coils. [Means for solving the problem]

[0007] According to the embodiment, the electric motor comprises a rotor and a stator. The rotor is fixed to a rotating shaft and rotates the rotating shaft. The stator has a stator core concentrically surrounding the rotor and windings wound around the stator core. The stator core has a yoke, teeth, slots, and insulating components. The yoke is cylindrical and concentrically surrounding the rotor. Each of the plurality of teeth protrudes radially inward from the yoke and is spaced apart in the circumferential direction of the yoke. Each of the plurality of slots is formed between adjacent teeth in the circumferential direction and accommodates the windings. The insulating components cover the yoke and each of the plurality of teeth, insulating them from the windings. The insulating components comprise a yoke portion that covers the yoke and a teeth portion that covers each of the plurality of teeth. The teeth portion has at least a covering portion that covers the circumferential side surface of each of the plurality of teeth over its entire length in the axial direction, which is the direction in which the rotation axis extends. The covering portion has a protrusion at approximately the midpoint of its entire length in the axial direction, which protrudes more than at any other point. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic circuit diagram showing the configuration of an air conditioner according to the first embodiment. [Figure 2] This is a schematic longitudinal cross-sectional view showing a compressor according to the first embodiment. [Figure 3] This is a schematic diagram showing the electric motor according to the first embodiment from above. [Figure 4] Figure 3 is a schematic perspective view showing the stator core of the electric motor, with three segmented cores arranged circumferentially (with insulating components attached). [Figure 5] Figure 3 is a schematic perspective view showing the individual components of the segmented cores that make up the stator core of the electric motor shown. [Figure 6] This is a schematic perspective view showing the bobbin in a state in which the first part and the second part of the bobbin according to the first embodiment are assembled. [Figure 7] Figure 6 is a schematic perspective view showing the bobbin divided into a first and second section. [Figure 8] Figure 4 shows a cross-section perpendicular to the axial direction of the stator core and bobbin, and schematically illustrates the cross-section at the side covering portion that does not include the protrusions. [Figure 9] Figure 4 shows a cross-section perpendicular to the axial direction of the stator core and bobbin, and schematically illustrates the cross-section at the location of the side covering portion, including the protrusion. [Figure 10] This figure schematically shows a cross-section of the side covering portion including a protrusion according to a modified example of the first embodiment. [Figure 11] This diagram schematically shows a comparative example in which the coil is wound around the teeth via a bobbin. [Figure 12] This diagram schematically shows the state in which the coil is wound around the teeth via a bobbin in the first embodiment. [Figure 13] This figure shows a vertical cross-section of the side covering portion of the second embodiment at the same position as the vertical cross-section of the stator core and bobbin with respect to the axial direction shown in Figure 4. [Modes for carrying out the invention]

[0009] (First Embodiment) Embodiments of the present invention will be described below with reference to the drawings. The applications of the electric motor according to the present invention are not particularly limited. In this embodiment, the case in which it is used in the electric motor section of a rotary compressor (hereinafter simply referred to as a compressor) of an air conditioner will be described as an example. The electric motor section is the drive source for the compression mechanism that compresses the refrigerant in the compressor.

[0010] Figure 1 is a circuit diagram of the refrigeration cycle of the air conditioner 1 according to this embodiment. The air conditioner 1 is a device that performs air conditioning by such a refrigeration cycle, and is an example of a refrigeration cycle device. The air conditioner 1 mainly comprises a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor fan 401, an expansion device 5, an indoor heat exchanger 6, and an indoor fan 601.

[0011] As shown in Figure 1, the refrigerant discharge side of the compressor 2 is connected to the first port 3a of the four-way valve 3. The second port 3b of the four-way valve 3 is connected to the outdoor heat exchanger 4. The outdoor heat exchanger 4 is connected to the indoor heat exchanger 6 via the expansion device 5. The indoor heat exchanger 6 is connected to the third port 3c of the four-way valve 3. The fourth port 3d of the four-way valve 3 is connected to the refrigerant suction side of the compressor 2 via the accumulator 8. The refrigerant circulates through a circulation circuit 7 from the discharge side of the compressor 2, through the outdoor heat exchanger 4, the expansion device 5, the indoor heat exchanger 6, and the accumulator 8, to the suction side.

[0012] For example, when the air conditioner 1 operates in cooling mode, the four-way valve 3 switches so that the first port 3a communicates with the second port 3b, and the third port 3c communicates with the fourth port 3d. When the air conditioner 1 starts operating in cooling mode, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 2 is discharged into the circulation circuit 7. The discharged gaseous refrigerant is guided through the four-way valve 3 to the outdoor heat exchanger 4, which functions as a condenser (heat radiator).

[0013] The gaseous refrigerant guided to the outdoor heat exchanger 4 condenses through heat exchange with the air (outdoor air) sucked in by the outdoor blower 401 and changes into a high-pressure liquid-phase refrigerant. The high-pressure liquid-phase refrigerant is depressurized in the process of passing through the expansion device 5 and changes into a low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is guided to the indoor heat exchanger 6 that functions as an evaporator (heat absorber), and heat exchange occurs in the process of passing through the indoor heat exchanger 6 with the air (indoor air) sucked in by the indoor blower 601.

[0014] As a result, the gas-liquid two-phase refrigerant absorbs heat from the air and evaporates, changing into a low-temperature and low-pressure gaseous refrigerant. The air passing through the indoor heat exchanger 6 is cooled by the latent heat of vaporization of the liquid-phase refrigerant and is sent as cold air to the place to be air-conditioned (cooled) by the indoor blower 601.

[0015] The low-temperature and low-pressure gaseous refrigerant passing through the indoor heat exchanger 6 is guided to the accumulator 8 via the four-way valve 3. When there is liquid-phase refrigerant mixed in the refrigerant that has not completely evaporated, it is separated here into liquid-phase refrigerant and gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant separated from the liquid-phase refrigerant is sucked into the compressor 2 from the accumulator 8 and is compressed again by the compressor 2 into a high-temperature and high-pressure gaseous refrigerant and discharged into the circulation circuit 7.

[0016] On the other hand, when the air conditioner 1 operates in the heating mode, the four-way valve 3 switches so that the first port 3a communicates with the third port 3c and the second port 3b communicates with the fourth port 3d. When the operation of the air conditioner 1 is started in the heating mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 2 is guided to the indoor heat exchanger 6 via the four-way valve 3 and heat exchange occurs with the air passing through the indoor heat exchanger 6. In this case, the indoor heat exchanger 6 functions as a condenser.

[0017] As a result, the gaseous refrigerant passing through the indoor heat exchanger 6 condenses by heat exchange with the air (indoor air) sucked in by the indoor blower 601 and changes into a high-pressure liquid-phase refrigerant. The air passing through the indoor heat exchanger 6 is heated by heat exchange with the gaseous refrigerant and is sent as warm air to the place to be air-conditioned (heated) by the indoor blower 601.

[0018] The high-temperature liquid-phase refrigerant that has passed through the indoor heat exchanger 6 is led to the expansion device 5, and as it passes through the expansion device 5, it is depressurized and changed into a low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is led to the outdoor heat exchanger 4, which functions as an evaporator, and evaporates by exchanging heat with the air (outside air) drawn in by the outdoor fan 401, changing into a low-temperature, low-pressure gas-phase refrigerant. The low-temperature, low-pressure gas-phase refrigerant that has passed through the outdoor heat exchanger 4 is drawn into the compressor 2 via the four-way valve 3 and the accumulator 8, and is compressed again into a high-temperature, high-pressure gas-phase refrigerant in the compressor 2 and discharged into the circulation circuit 7.

[0019] In this embodiment, the air conditioner 1 is capable of operating in either cooling mode or heating mode. However, the air conditioner 1 may also be a cooling-only unit or a heating-only unit that can operate in either cooling mode or heating mode only.

[0020] Next, the specific configuration of the compressor 2 used in the air conditioner 1 will be explained with reference to Figure 2. Figure 2 is a longitudinal cross-sectional view schematically showing the configuration of the compressor 2. As shown in Figure 2, the compressor 2 is a so-called vertical rotary compressor, and its main components are a sealed container 10, a compression mechanism 11, and an electric motor 12. In the following explanation, the side where the compression mechanism 11 is located will be considered the bottom, and the side where the electric motor 12 is located will be considered the top, based on the relative positional relationship between the compression mechanism 11 and the electric motor 12, which are aligned along the central axis O1 of the sealed container 10, which will be described later. The direction in which the central axis O1 extends will be called the axial direction, and the direction connecting the center and circumference of the circle, which is a cross-section perpendicular to the axial direction, will be called the radial direction.

[0021] The sealed container 10 has a cylindrical peripheral wall 10a and stands perpendicular to the installation surface. The installation surface is, for example, the bottom plate of the outdoor unit of the air conditioner 1. A refrigerant discharge pipe 10b is provided at the upper end of the sealed container 10. The discharge pipe 10b constitutes part of the circulation circuit 7 and is connected to the first port 3a of the four-way valve 3 via the circulation circuit 7. An oil reservoir 10c for storing lubricating oil I is provided at the lower part of the sealed container 10.

[0022] The compression mechanism 11 compresses the refrigerant inside the sealed container 10 and discharges the compressed refrigerant into the sealed container 10. The compression mechanism 11 is housed in the lower part of the sealed container 10 so as to be immersed in the lubricating oil I. In the example shown in Figure 2, the compression mechanism 11 has a twin-cylinder structure and mainly comprises a first cylinder 13, a second cylinder 14, a rotating shaft 15, a first roller 16, and a second roller 17. Note that the number of cylinders in the compression mechanism is not limited to two, but may be one or three or more.

[0023] The first cylinder 13 is fixed to the inner surface of the peripheral wall 10a of the sealed container 10. The second cylinder 14 is fixed to the lower surface of the first cylinder 13 via a partition plate 18.

[0024] A first bearing 20 is fixed above the first cylinder 13. The first bearing 20 covers the inner diameter of the first cylinder 13 from above and protrudes upward toward the first cylinder 13. The space enclosed by the inner diameter of the first cylinder 13, the partition plate 18, and the first bearing 20 constitutes the first cylinder chamber 21. The partition plate 18 corresponds to a closing member that defines the lower surface of the first cylinder chamber 21, and the first bearing 20 corresponds to a closing member that defines the upper surface of the first cylinder chamber 21.

[0025] A second bearing 22 is fixed below the second cylinder 14. The second bearing 22 covers the inner diameter of the second cylinder 14 from below and protrudes downward toward the second cylinder 14. The space enclosed by the inner diameter of the second cylinder 14, the partition plate 18, and the second bearing 22 constitutes the second cylinder chamber 23. The partition plate 18 corresponds to a closing member that defines the upper surface of the second cylinder chamber 23, and the second bearing 22 corresponds to a closing member that defines the lower surface of the second cylinder chamber 23. The first cylinder chamber 21 and the second cylinder chamber 23 are arranged concentrically with the central axis O1 of the sealed container 10.

[0026] The first cylinder chamber 21 and the second cylinder chamber 23 are connected to the accumulator 8 via refrigerant suction pipes 25a and 25b. The suction pipes 25a and 25b constitute part of the circulation circuit 7. The gaseous refrigerant separated from the liquid phase refrigerant in the accumulator 8 is guided through these suction pipes 25a and 25b to the first cylinder chamber 21 and the second cylinder chamber 23.

[0027] The rotating shaft 15 has its axis coaxial with the central axis O1 of the sealed container 10 and penetrates the first cylinder chamber 21, the second cylinder chamber 23, and the partition plate 18. The rotating shaft 15 has a first journal portion 27a, a second journal portion 27b, and a pair of crankpin portions (eccentric portions) 28a, 28b. In other words, the rotating shaft 15 is configured as a crankshaft. The first journal portion 27a is rotatably supported by a first bearing 20. The second journal portion 27b is rotatably supported by a second bearing 22.

[0028] Furthermore, the rotating shaft 15 has an extension 27c that extends coaxially from the first journal portion 27a. The extension 27c passes through the first bearing 20 and protrudes above the compression mechanism portion 11. The rotor 33 of the electric motor 12, which will be described later, is fixed to the extension 27c by press-fitting or the like.

[0029] The eccentric portions 28a and 28b are located between the first journal portion 27a and the second journal portion 27b. The eccentric portions 28a and 28b are arranged, for example, with a 180-degree phase difference in the circumferential direction with respect to the central axis O1 of the sealed container 10, and their eccentricity with respect to the central axis O1 is the same. One eccentric portion (hereinafter referred to as the first eccentric portion) 28a is housed in the first cylinder chamber 21. The other eccentric portion (hereinafter referred to as the second eccentric portion) 28b is housed in the second cylinder chamber 23.

[0030] The ring-shaped first roller 16 is fitted to the outer circumferential surface of one eccentric portion 28a. When the rotating shaft 15 rotates, the first roller 16 rotates eccentrically within the first cylinder chamber 21, and a portion of the outer circumferential surface of the first roller 16 makes slidable line contact with the inner circumferential surface of the first cylinder chamber 21 via an oil film.

[0031] The ring-shaped second roller 17 is fitted onto the outer circumferential surface of the other eccentric portion 28b. When the rotating shaft 15 rotates, the second roller 17 rotates eccentrically within the second cylinder chamber 23, and a portion of the outer circumferential surface of the second roller 17 makes slidable line contact with the inner circumferential surface of the second cylinder chamber 23 via an oil film.

[0032] As shown in Figure 2, a vane 30 is positioned in the second cylinder 14. The vane 30 is supported by the second cylinder 14, for example, while being biased radially by a biasing means. The tip of the vane 30 is slidably pressed against the outer circumferential surface of the second roller 17. The vane 30 works in cooperation with the second roller 17 to divide the second cylinder chamber 23 into an intake region and a compression region, and moves in a direction that protrudes into the second cylinder chamber 23 or recedes from the second cylinder chamber 23 in accordance with the eccentric movement of the second roller 17. As the vane 30 moves back and forth relative to the second cylinder chamber 23 in this way, the volumes of the intake region and compression region of the second cylinder chamber 23 change, and the gaseous refrigerant drawn into the second cylinder chamber 23 from the suction pipe 25b is compressed.

[0033] Although not shown in the diagram, similar vanes 30 are also arranged in the first cylinder 13. Therefore, when the first roller 16 performs eccentric motion within the first cylinder chamber 21, the volumes of the intake and compression regions of the first cylinder chamber 21 change, and the gaseous refrigerant drawn into the first cylinder chamber 21 from the suction pipe 25a is compressed.

[0034] The high-temperature, high-pressure gaseous refrigerant compressed in the first cylinder chamber 21 and the second cylinder chamber 23 is discharged into the sealed container 10 via a discharge valve mechanism (not shown). The discharged gaseous refrigerant rises inside the sealed container 10. Furthermore, while the compression mechanism 11 is operating, the lubricating oil I stored in the oil reservoir 10c of the sealed container 10 is agitated. The agitated lubricating oil I becomes mist-like and rises inside the sealed container 10 towards the discharge pipe 10b, carried by the flow of the gaseous refrigerant. The sealed container 10 incorporates an oil separator 100 that separates the lubricating oil I contained in the gaseous refrigerant rising inside.

[0035] Figure 3 is a schematic diagram showing the configuration of the electric motor 12 from above. As shown in Figures 2 and 3, the electric motor 12 is a drive device that drives the compression mechanism 11 and is housed in the sealed container 10 so as to be located between the compression mechanism 11 and the discharge pipe 10b. The electric motor 12 is a so-called inner rotor type electric motor and comprises a rotor 33 fitted onto a rotating shaft 15 and a stator 34 fixed to the inner surface of the peripheral wall 10a of the sealed container 10. Power is supplied to the electric motor 12 from the power source, causing the rotor 33 to rotate around the central axis O1 relative to the stator 34, and the rotating shaft 15 to rotate together with the rotor 33. The rotating shaft 15 is rotatably supported by two bearings 20 and 22.

[0036] The rotor 33 is equipped with a cylindrical core portion 35. The core portion 35 is constructed by stacking, for example, multiple annular electromagnetic steel sheets in the axial direction. The stacked electromagnetic steel sheets are integrated by means of crimping, for example, to form a single rotor 33. An insertion hole 36 is formed in the center of the core portion 35 into which an extension portion 27c of the rotating shaft 15 is inserted. The extension portion 27c of the rotating shaft 15 is coaxially fixed to the center of the core portion 35 facing the insertion hole 36 by means of press-fitting, for example.

[0037] The upper part of the extension 27c of the rotating shaft 15 is formed with a smaller diameter than the insertion hole 36 of the core part 35. The upper part of the extension 27c protrudes above the core part 35. A gap is secured between the outer circumferential surface of the upper part of the extension 27c and the inner circumferential surface of the center of the core part 35 facing the insertion hole 36, and the gap is continuous in the circumferential direction of the core part 35.

[0038] Multiple plate-shaped permanent magnets 38 are integrally embedded inside the core portion 35. The permanent magnets 38 are arranged to surround the insertion hole 36. Furthermore, multiple first flow passages 39 are formed near the inner circumference of the core portion 35. Each of the multiple first flow passages 39 penetrates the core portion 35 in the axial direction and is arranged at predetermined intervals in the circumferential direction of the core portion 35 so as to surround the insertion hole 36. Through these first flow passages 39, the gaseous refrigerant discharged from the compression mechanism 11 into the sealed container 10 is guided to the discharge pipe 10b.

[0039] The rotor 33 is equipped with a first balance weight 40 and a second balance weight 41. The first balance weight 40 and the second balance weight 41 are elements that counteract the rotational unbalance of the rotating shaft 15 caused by the eccentric motion of the first roller 16 and the second roller 17.

[0040] The first balance weight 40 consists of an annular first end plate 42 and a plurality of weight plates 43 stacked on the first end plate 42. The first end plate 42 is fixed to the upper end surface of the core portion 35. The second balance weight 41 consists of an annular second end plate 44 and a plurality of weight plates 45 stacked on the second end plate 44. The second end plate 44 is fixed to the lower end surface of the core portion 35.

[0041] The stator 34 has a stator core 34a and a coil (winding) 53. The stator core 34a is composed of a substantially cylindrical yoke 50 and a plurality of teeth (magnetic pole teeth) 51 that protrude radially inward from the yoke 50. The coil 53 is wound around each of the teeth 51 of the stator core 34a.

[0042] The stator core 34a is constructed in a substantially cylindrical shape by stacking multiple electromagnetic steel sheets in the axial direction, and concentrically surrounds the rotor 33 over substantially its entire axial length. The stacked electromagnetic steel sheets are integrated by, for example, crimping. Each of the multiple teeth 51 is arranged at a predetermined interval in the circumferential direction (hereinafter simply referred to as the circumferential direction) of the yoke 50, and protrudes from the inner circumferential surface of the yoke 50 toward the outer circumferential surface of the rotor 33 over the entire axial length of the yoke 50. The axial direction of the yoke 50 is the direction in which the central axis of the yoke 50 (same as the central axis line O1) extends. A narrow air gap G is formed between the tip surface 51c of the tooth 51 and the outer circumferential surface of the rotor 33. The number of teeth 51 can be arbitrarily set to correspond to the number of magnetic poles. In the example shown in Figure 3, twelve teeth 51 are provided on the stator core 34a.

[0043] Furthermore, in this embodiment, the stator core 34a is constructed by assembling divided cores 34b (hereinafter referred to as divided cores) 34b, which are divided into multiple sections in the circumferential direction, with each section being assembled together. However, the stator core 34a does not have to be constructed in this divided manner. For example, the stator core 34a is divided according to the teeth 51 it has. In the example shown in Figure 3, the stator core 34a is divided into twelve divided cores 34b. These divided cores 34b are arranged in a line in the circumferential direction, forming a substantially cylindrical stator core 34a as a whole. Two circumferentially adjacent divided cores 34b are arranged in a line in the circumferential direction with their side portions 50e and 50f in contact with each other. Figure 4 is a perspective view showing, as an example, a state in which three divided cores 34b in the stator core 34a of Figure 3, which is constructed in a substantially cylindrical shape as a whole, are arranged in a line in the circumferential direction (a state in which the insulating component 55, which will be described later, is attached). Figure 5 is a schematic perspective view showing the individual configurations of the segmented cores 34b that make up the stator core 34a shown in Figure 3.

[0044] As shown in Figures 3 to 5, each of the multiple segmented cores 34b constitutes a portion of the yoke 50 in the stator core 34a and a single tooth 51 protruding from the portion of the yoke 50. In other words, the stator core 34a is composed of multiple segmented cores 34b, each containing a single tooth 51 and a portion of the yoke 50 from which the single tooth 51 protrudes.

[0045] The portion of the yoke 50 includes an outer circumferential surface portion 50a that forms the outer surface of the stator core 34a, a flat inner circumferential surface portion 50b facing the slot 52, flat end surfaces 50c and 50d that connect to the outer circumferential surface portion 50a and the inner circumferential surface portion 50b at both ends in the axial direction, and flat side surfaces 50e and 50f that are contact points with adjacent segmented cores 34b. Adjacent segmented cores 34b in the circumferential direction are arranged so that the side surface portion 50e of one segmented core 34b is in contact with the side surface portion 50f of the other segmented core 34b.

[0046] The teeth 51 consist of a pair of side surfaces 51a, 51b extending radially toward the rotor 33 from the inner circumferential surface 50b of the yoke 50 in the divided core 34b, a protruding end surface 51c connecting the inner diameter edges of these side surfaces 51a, 51b, and flat end surfaces 51d, 51e connecting to the side surfaces 51a, 51b and the protruding end surface 51c at both ends in the axial direction. The side surfaces 51a, 51b each project in the circumferential direction from the side surfaces 51a, 51b and connect to the protruding end surface 51c and the end surfaces 51d, 51e, and have a pair of projections 51f, 51f that extend continuously along the entire axial length of the divided core 34b. The protruding end surface 51c is located at the inner diameter end of the teeth 51 and faces the outer circumferential surface of the core 35 of the rotor 33 with a narrow air gap G between them. The end face portion 51d is flush with and continuous with the end face portion 50c of the yoke 50, and the end face portion 51e is flush with and continuous with the end face portion 50d of the yoke 50. These end faces 50c, 50d and 51d, 51e constitute the end faces at both axial ends of the divided core 34b, and ultimately the stator core 34a.

[0047] As shown in Figures 3 and 4, slots 52 are formed between adjacent teeth 51 in the stator core 34a, or in other words, on both sides of the teeth 51 in the split core 34b. The slots 52 are spaces for accommodating the coils 53 wound around the teeth 51. The slots 52 are spaced apart in the circumferential direction of the yoke 50 and are continuous along the entire axial length of the yoke 50.

[0048] Furthermore, the yoke 50 has a plurality of second flow passages 54. Each of the plurality of second flow passages 54 is, for example, a recess (groove) extending along the axial direction provided on the outer circumferential surface of the yoke 50, and is arranged at predetermined intervals in the circumferential direction of the yoke 50. Through these second flow passages 54, the gaseous refrigerant discharged from the compression mechanism 11 into the sealed container 10 is guided to the discharge pipe 10b.

[0049] In this embodiment, the stator core 34a is equipped with an insulating component 55. The insulating component 55 is a component interposed between the yoke 50 and each of the multiple teeth 51 of the stator core 34a and the coil (winding) 53 for insulation. That is, the coil 53 is wound around the teeth 51 of the stator core 34a via the insulating component 55 (specifically, a bobbin 550 described later). The insulating component 55 is made of an insulator, such as an electrically insulating synthetic resin material such as polybutylene terephthalate resin, liquid crystal polymer resin, or polyphenylene sulfide resin.

[0050] In the examples shown in Figures 2 to 4, the insulating component 55 covers the entire side portions 51a, 51b of the teeth 51 of the stator core 34a, and the entire end portions 51d, 51e (see Figure 5) of the teeth 51. In addition, the insulating component 55 covers the entire inner circumferential surface portion 50b of the yoke 50 of the stator core 34a, and a portion of the end portions 50c, 50d (see Figure 5) of the yoke 50. That is, in the stator core 34a, the insulating component 55 covers the surface of the teeth 51 excluding the protruding end portion 51c, and the surface of the yoke 50 excluding the entire outer circumferential surface portion 50a and a portion of the end portions 50c, 50d.

[0051] In this embodiment, the insulating component 55 is constructed by assembling multiple divided components (hereinafter referred to as bobbins) 550, which are divided in a circumferential direction, similar to the stator 34 described above. As an example, the insulating component 55 is constructed by dividing it into multiple bobbins 550 that cover one tooth 51 included in the divided core 34b and a part of the yoke 50 from which the tooth 51 protrudes, thereby insulating them from the coil 53. However, the insulating component 55 does not have to be constructed in such a divided manner. The insulating component 55 is divided for each tooth 51 that the stator core 34a has, for example, similar to the stator core 34a. In the example shown in Figure 3, the insulating component 55 is divided into twelve bobbins 550, the same number as the divided core 34b.

[0052] Each of the multiple bobbins 550 is configured to be further subdivided axially into multiple parts, for example, a first part 56 and a second part 57 in this embodiment. As shown in Figure 2, the first part 56 is one axial part of the bobbin 550, the upper part in the illustrated example, and the second part 57 is the other axial part of the bobbin 550, the lower part in the illustrated example. That is, the first part 56 and the second part 57 are assembled and integrated to form one bobbin 550. When these multiple bobbins 550 are arranged in a circumferential direction, a substantially cylindrical insulating component 55 is formed as a whole.

[0053] Figures 6 and 7 schematically show the configuration of the bobbin 550. Figure 6 is a perspective view showing the bobbin 550 with the first part 56 and the second part 57 assembled. Figure 7 is a perspective view showing the bobbin 550 shown in Figure 6 separated into the first part 56 and the second part 57.

[0054] As shown in Figures 4, 6, and 7, the bobbin 550 is constructed by assembling a first portion 56 and a second portion 57 in the axial direction. In this embodiment, the first portion 56 and the second portion 57 are identical in form and are assembled inverted axially.

[0055] The bobbin 550, which is assembled from a first part 56 and a second part 57, includes a yoke portion 60 and a teeth portion 70. The first part 56 comprises a portion of the yoke portion 60 and the teeth portion 70 of the bobbin 550, and the second part 57 comprises the remaining portions of the yoke portion 60 and the teeth portion 70 of the bobbin 550 other than the first part 56.

[0056] The yoke portion 60 covers the inner circumferential surface portion 50b and the end faces 50c, 50d of the yoke 50 of the stator core 34a, specifically the portion where the divided core 34b constitutes part of the yoke 50. In other words, the yoke portion 60 covers a portion of the yoke 50 in the divided core 34b. In the illustrated example, the yoke portion 60 has an inner circumferential surface covering portion 61 that covers the entire inner circumferential surface portion 50b and an end face covering portion 62 that covers a portion of the end faces 50c, 50d. The inner circumferential surface covering portion 61 covers the inner circumferential surface portion 50b of the yoke 50 along its entire length in both the axial and radial directions. The inner circumferential surface covering portion 61 is the portion of the yoke portion 60 that faces the slot 52 of the stator core 34a. The end face covering portion 62 covers the portion of the end faces 50c, 50d of the yoke 50 that is closer to the inner circumference. The end face covering portion 62 extends axially from the covered portion of the end face portions 50c and 50d of the yoke 50, continuous with the inner circumferential covering portion 61, and guides the winding of the coil 53 and supports the wound coil, as will be described later.

[0057] The teeth portion 70 covers the teeth 51 of the stator core 34a, specifically the side portions 51a, 51b, end portions 51d, 51e, and projection portion 51f of the divided core 34b that constitute the teeth 51. In other words, the teeth portion 70 covers a part of the teeth 51 of the divided core 34b. In the illustrated example, the teeth portion 70 has a side covering portion 71 that covers the entire side portions 51a, 51b, an end covering portion 72 that covers the entire end portions 51d, 51e, and a projection covering portion 73 that covers the entire projection portion 51f. The side covering portion 71 and the projection covering portion 73 are the parts of the teeth portion 70 that face the slot 52 of the stator core 34a.

[0058] The side covering portion 71 covers the side portions 51a and 51b of the teeth 51 along their entire length in both the axial and radial directions. The end covering portion 72 covers the end portions 51d and 51e of the teeth 51 along their entire length in both the axial and radial directions. The projection covering portion 73 covers the projection portion 51f of the teeth 51 along its entire length in both the axial and radial directions. Furthermore, the end covering portion 72 and the projection covering portion 73 extend axially from the covered portions of the end portions 51d and 51e and the projection portion 51f of the teeth 51, and as described later, they guide the winding of the coil 53 and support the wound coil 53.

[0059] The tooth portion 70 has a space inside surrounded by the side covering portion 71, the end covering portion 72, and the projection covering portion 73, and further has an opening 74 at the radial tip of this space, exposing the protruding end surface portion 51c of the tooth 51 through the opening 74. The protruding end surface portion 51c exposed through the opening 74 faces the outer circumferential surface of the rotor 33 with an air gap G (Figures 1 and 3) between them.

[0060] Furthermore, in the teeth portion 70, the side covering portion 71 has a protrusion 80 at approximately the midpoint of its overall length in the axial direction, which protrudes more than at other points. Figures 8 and 9 show perpendicular cross-sections of the stator core 34a and bobbin 550 shown in Figure 4, respectively. Figure 8 is a schematic diagram showing a cross-section of the side covering portion 71 at a point that does not include the protrusion 80. Figure 9 is a schematic diagram showing a cross-section of the side covering portion 71 at a point that includes the protrusion 80.

[0061] As shown in Figures 4, 6 to 9, the protrusion 80 and the side covering portion 71 include an intermediate point in the axial direction of the entire length, and are symmetrical with respect to this intermediate point, with the protrusion 80 extending upward on one side and downward on the other side in the axial direction. The protrusion 80 has a flat top portion 81 and a middle section 82 that tapers and continues from the top portion 81 toward one side and the other side in the axial direction to the flat portion 711 of the side covering portion 71. The flat portion 711 of the side covering portion 71 is the part of the side covering portion 71 other than the protrusion 80, that is, the part that is the base of the protrusion 80 (the surface part of the side covering portion 71). The top portion 81 is the protruding end of the protrusion 80 and is a flat surface that is parallel to the axial direction and contacts the coil 53. The middle section 82 is a sloped surface that is smoothly continuous with the flat portion 711 without any steps. In other words, the protrusion 80 is smoothly and seamlessly connected to the parts of the side covering portion 71 other than the protrusion 80 (i.e., the flat portion 711) at both ends in the axial direction of the top portion 81.

[0062] Furthermore, in the illustrated example, the protrusion 80 is continuously arranged along the entire radial length of the side covering portion 71, and is continuous with the inner circumferential covering portion 61 of the yoke portion 60 at the radial outer diameter end, and continuous with the projection covering portion 73 of the teeth portion 70 at the radial inner diameter end.

[0063] However, as shown in the modified example in Figure 10, the protrusion 800 may be arranged continuously in the radial direction in the inner portion of the side covering portion 71. Figure 10 is a schematic diagram showing a cross-section of the side covering portion 71 including the protrusion 800 according to the modified example. In the illustrated example, the protrusion 800 is arranged only in a part of the total length of the side covering portion 71 in the radial direction, specifically, continuously in the inner portion from approximately the midpoint of the radial length of the side covering portion 71 (in the case of the teeth 51). The protrusion 800 is continuous with the projection covering portion 73 of the teeth portion 70 at its radial inner diameter end. The radial outer diameter end of the protrusion 800 is tapered and continuous with the flat portion 711 of the side covering portion 71 toward the outer diameter.

[0064] In the side covering portion 71, the protrusion 80 protrudes in the direction normal to the flat portion 711. The protrusion height of the protrusion 80 (the distance in the direction normal to the flat portion 711 from the flat portion 711 to the top 81) is set to an optimal value considering factors such as the axial length of the side covering portion 71 (specifically the teeth 51) and the wire diameter, linear density, and tension of the coil 53. The protrusion height of the protrusion 80 is the distance in the direction normal to the flat portion 711 from the flat portion 711 of the side covering portion 711 to the top 81 of the protrusion 80. Similarly, the protrusion length of the protrusion 80 is set to an optimal value considering factors such as the axial length of the side covering portion 71 (specifically the teeth 51) and the wire diameter, linear density, and tension of the coil 53. The protrusion length of the protrusion 80 is the axial distance between the points where the middle section 82 of the protrusion 80 is continuous with the flat portion 711 of the side covering portion 71 at its axial end.

[0065] As described above, in this embodiment, as an example, the bobbin 550 is configured to be axially separable into a first part 56 and a second part 57, as shown in Figure 7. In Figure 7, the yoke part 60 and the teeth part 70 of the bobbin 550 are distinguished by the subscript 'a' for the part corresponding to the first part 56 and the subscript 'b' for the part corresponding to the second part 57. However, if no particular distinction is required, the subscripts will be omitted in the explanation.

[0066] The first part 56 comprises an inner circumferential covering portion 61a and an end covering portion 62a of the yoke portion 60a, which is part of the yoke portion 60, and also comprises a side covering portion 71a, an end covering portion 72a, a projection covering portion 73a, and an opening 74a of the teeth portion 70b, which is part of the teeth portion 70. The second part 57 comprises an inner circumferential covering portion 61b and an end covering portion 62b of the yoke portion 60b, which is the remaining part of the yoke portion 60 other than the first part, and also comprises a side covering portion 71b, an end covering portion 72b, a projection covering portion 73b, and an opening 74b of the teeth portion 70b, which is the remaining part of the teeth portion 70b other than the first part.

[0067] In the illustrated example, the first portion 56 and the second portion 57 are divided at the position of the protrusion 80. Of the pair of side covering portions 71a of the teeth portion 70a of the first portion 56, one side covering portion 71a has the top portion 81 and one of the middle portion 82 of the protrusion 80a (the middle portion 821 shown in Figure 7), and the other side covering portion 71a has the other of the middle portion 82 of the protrusion 80a (the middle portion 822 shown in Figure 7). Similarly, of the pair of side covering portions 71b of the teeth portion 70b of the second portion 57, one side covering portion 71b has the top portion 81 and one of the middle portion 82 of the protrusion 80b (the middle portion 821), and the other side covering portion 71b has the other of the middle portion 82 of the protrusion 80b (the middle portion 822).

[0068] When the first part 56 and the second part 57 are assembled and integrated, the top 81 and middle section 821 of the protrusion 80a and the middle section 822 of the protrusion 80b constitute the protrusion 80. Similarly, the top 81 and middle section 821 of the protrusion 80b and the middle section 822 of the protrusion 80a constitute the protrusion 80.

[0069] The assembly method for integrating the first part 56 and the second part 57 is arbitrary. In this embodiment, as an example, as shown in Figure 7, the two parts are integrated as shown in Figure 6 by inserting one of the insertion parts 76 of the first part 56 and the second part 57 into the other insertion part 77 in the axial direction. In the illustrated example, the first part 56 and the second part 57 have an insertion part 76 on one of the pair of side covering parts 71 of the teeth part 70 and an insertion part 77 on the other side covering part 71. Thus, the first part 56 and the second part 57 are assembled and integrated by inserting the insertion parts 76 into the insertion parts 77 alternately.

[0070] Here, a coil 53 is wound around the teeth 51 via a bobbin 550 with a predetermined tension on the stator core 34a. The wound coil 53 makes relatively stronger contact with the axial end of the side covering portion 71 (the continuous portion with the end face covering portion 72; hereinafter referred to as the corner portion 75 of the teeth portion 70) than with other portions of the side covering portion 71. For example, as shown in Figure 11, the coil 53 is in contact with the corner portion 75 of the teeth portion 70 and is not in contact with the side covering portion 71. Figure 11 is a schematic diagram showing the state in which the coil 53 is wound around the teeth 51 via a bobbin 550, and is a diagram showing a form in which the protrusion 80 of the side covering portion 71 is omitted as a comparative example of this embodiment.

[0071] On the other hand, in this embodiment, the side covering portion 71 is provided with a protrusion 80. The protrusion 80 projects from the flat portion 711 of the side covering portion 71 in the direction normal to the flat portion 711, that is, toward the wound coil 53.

[0072] Therefore, as shown in Figure 12, the wound coil 53 can be actively brought into contact with the top portion 81, which is the protruding end of the protrusion 80. Figure 12 is a schematic diagram showing the state in which the coil 53 is wound around the teeth 51 via the bobbin 550 in this embodiment. In this way, according to this embodiment, the coil 53 can be brought into contact with the protrusion 80 without being biased towards the axial end of the side covering portion 71 (the continuous portion with the end face covering portion 72), and the contact points with the side covering portion 71 can be dispersed. As a result, the concentration of stress and heat generated in the coil 53 at the contact points with the side covering portion 71 can be appropriately suppressed, and these stresses and heat can be dispersed.

[0073] Furthermore, by bringing the coil 53 into contact with the protrusion 80, a gap S can be created between the coil 53 and the flat portion 711 of the side covering portion 71. This reduces the capacitance of the coil 53 and thus the leakage current compared to, for example, the comparative example shown in Figure 11. In addition, it is possible to reduce EMC (Electromagnetic Compatibility). Therefore, the reliability of the electric motor 12 can be improved.

[0074] Furthermore, by creating a gap S between the coil 53 and the flat portion 711 of the side covering portion 71, the gaseous refrigerant discharged into the sealed container 10 of the compressor 2 can pass through the gap S. In this case, for example, compared to the comparative example shown in Figure 11, it becomes easier to actively enlarge the gap S. This allows heat generated in the coil 53 to escape from the protrusion 80 that contacts the coil 53, thereby improving the heat dissipation performance of the coil 53.

[0075] The electric motor 12 generates a rotating magnetic field when current flows through the coil 53, causing the rotor 33 to rotate relative to the stator 34. During this process, a Lorentz force is generated in the coil 53 through which the current flows. The Lorentz force in the coil 53 is greater at locations closer to the inner circumference of the slot 52. Due to this uneven distribution of the Lorentz force, vibration occurs in the coil 53 in the direction normal to the flat portion 711 of the side covering portion 71, as indicated by arrows A11 in Figure 11 and A12 in Figure 12. The vibration of the coil 53 is correlated with the frequency of the current flowing through it and the amplitude of the vibration. At current frequencies specific to the electric motor 12, the vibration amplitude tends to increase due to resonance.

[0076] According to this embodiment, since the coil 53 can be brought into contact with the protrusion 80, the coil 53 can be supported not only by the corner 75 of the tooth portion 70 but also by the protrusion 80. Therefore, the stress generated by the vibration of the coil 53 can be distributed. For example, as in the comparative example shown in Figure 11, if vibration as indicated by arrow A11 occurs in the coil 53, the coil 53 may vibrate as shown by the dashed line. In contrast, in this embodiment, as shown in Figure 12, by bringing the coil 53 into contact with the protrusion 80, even if vibration as indicated by arrow A12 occurs in the coil 53, the amplitude can be suppressed compared to the case shown by the dashed line in the comparative example.

[0077] This prevents, for example, the deterioration of the coating covering the wires of the coil 53. In particular, it can significantly suppress the vibration amplitude of the coil 53 caused by resonance at the current frequency specific to the electric motor 12. In this way, by preventing the deterioration of the coating on the wires of the coil 53, it becomes possible to improve the quality of the electric motor 12.

[0078] As mentioned above, the Lorentz force generated in the coil 53 increases the further inward it is located on the inner circumference of the slot 52. Therefore, as shown in the modified example of this embodiment in Figure 10, by continuously arranging the protrusions 800 in the radial direction along a portion of the side covering portion 71 closer to the inner diameter, it is possible to accommodate relatively more coils 53 in the portions located on the outer circumference of the slot 52 compared to the portions located on the inner circumference of the slot 52. In other words, more coils 53 can be wound around the teeth 51. As a result, compared to the case where the protrusions 80 are continuously arranged along the entire radial length of the side covering portion 71 as in this embodiment, the performance of the electric motor 12 can be improved in terms of the amount of coil 53 wound around it.

[0079] (Second embodiment) As shown in Figure 9, in the first embodiment, the teeth portion 70 of the bobbin 550 has a side covering portion 71 that covers the side portion 51a of the teeth 51 of the stator core 34a, and a side covering portion 71 that covers the side portion 51b of the teeth 51, with pairs of protrusions 80 arranged on both sides. That is, with respect to the rotation direction of the rotating shaft and rotor 33 in the electric motor 12, the teeth portion 70 of the bobbin 550 has pairs of protrusions 80 arranged on both the leading side (forward side) and the trailing side (rear side) in the rotation direction.

[0080] However, the protrusions 80 do not necessarily have to be arranged in pairs on the leading and trailing sides in the rotational direction, and may be arranged on at least one side in the rotational direction. In this case, it is preferable to arrange the protrusions 80 on the leading side in the rotational direction. Figure 13 is a diagram showing a second embodiment, and schematically shows a cross-section at the location of the side covering portion 71 including the protrusions 90. In the second embodiment, the configuration other than the protrusions 90 is the same as in the first embodiment shown in Figures 1 to 9. Therefore, the configuration other than the protrusions 90 in the second embodiment will be omitted from the explanation by referring mutatis mutandis to Figures 1 to 9. Figure 13 shows a vertical cross-section at the same position as the vertical cross-section with respect to the axial direction of the stator core 34a and bobbin 550 in the first embodiment shown in Figure 4.

[0081] As shown in Figure 13, in the tooth portion 70 of the bobbin 550 according to this embodiment, the protrusion 90 is located only on one side of the rotation direction of the rotating shaft of the electric motor 12 and the rotor 33. In the illustrated example, this rotation direction is indicated by arrow A13, and the protrusion 90 is located only on the leading side of this rotation direction and not on the trailing side. That is, the protrusion 90 is located on the side covering portion 71, which is the portion where the tooth portion 70 covers the side portion 51b of each of the circumferential side portions 51a, 51b of the plurality of teeth 51 that is located on the leading side in the rotation direction of the rotor 33.

[0082] According to this embodiment, the length of the coil 53 wrapped around the teeth 51 can be shortened compared to the first embodiment. Furthermore, vibrations are more likely to occur in the portion of the coil 53 wrapped around the teeth 51 that is located on the leading side in the rotational direction of the teeth 51 than in the portion located on the trailing side. Therefore, by arranging the protrusion 90 only on the leading side in the rotational direction, as in this embodiment, vibrations generated in the coil 53 can be suppressed efficiently with a simpler configuration.

[0083] In the illustrated example, the protrusion 90 is arranged continuously along the entire radial length of the side covering portion 71, similar to the protrusion 80 in the first embodiment, and is continuous with the inner circumferential surface covering portion 61 of the yoke portion 60 at the radial outer diameter end, and continuous with the projection covering portion 73 of the teeth portion 70 at the radial inner diameter end. However, as in the modified protrusion 800 of the first embodiment shown in Figure 10, the protrusion 90 may be arranged continuously in the radial direction to the inner portion of the side covering portion 71. In this case, the protrusion 90 only needs to be arranged in a portion of the radial length of the side covering portion 71, specifically from approximately the middle of the radial length of the side covering portion 71 (or more precisely, the teeth 51) to the inner portion. For example, the convex portion 90 may be continuous with the projection covering portion 73 of the tooth portion 70 at its radially inner diameter end, and tapered to the flat portion 711 of the side covering portion 71 toward the outer diameter at its radially outer diameter end.

[0084] Although several embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0085] 1...Air conditioner, 2...Compressor, 3...Four-way valve, 4...Outdoor heat exchanger, 401...Outdoor fan, 5...Expansion device, 6...Indoor heat exchanger, 601...Indoor fan, 7...Circulation circuit, 10...Sealed container, 11...Compression mechanism, 12...Electric motor, 15...Rotating shaft, 33...Rotor, 34...Stator, 34a...Stator core, 34b...Split core, 50...Yoke, 50a...Outer surface, 50b...Inner surface, 50c, 50d...End surface, 50e, 50f...Side surface, 51...Teeth, 51a, 51b...Side surface, 51c...Protruding end surface, 51d, 51e...End surface, 51f...Protrusion, 52...Slot, 53...Coil, 55... Insulating component, 56...first part, 57...second part, 60, 60a, 60b...yoke part, 61, 61a, 61b...inner circumferential surface covering part, 62, 62a, 62b...end face covering part, 70, 70a, 70b...teeth part, 71, 71a, 71b...side covering part, 711...flat part, 72, 72a, 72b...end face covering part, 73, 73a, 73b...protruding covering part, 74, 74a, 74b...opening, 75...corner part, 76...insertion part, 77...inserted part, 80, 80a, 80b, 90, 800...protrusion part, 81...top part, 82, 821, 822...mid-section, 550...bobbin, O1...central axis of the sealed container, S...gap.

Claims

1. A rotor fixed to the rotating shaft and causing the rotating shaft to rotate, The system comprises a stator core concentrically surrounding the rotor, and a stator having windings wound around the stator core. The stator core comprises a cylindrical yoke concentrically surrounding the rotor, a plurality of teeth projecting radially inward from the yoke and spaced apart circumferentially from the yoke, a plurality of slots formed between adjacent teeth in the circumferential direction for housing the windings, and insulating components covering the yoke and each of the plurality of teeth to insulate them from the windings. The insulating component comprises a yoke portion that covers the yoke and a tooth portion that covers each of the plurality of teeth, The teeth portion has at least a covering portion that covers the circumferential side surface of each of the plurality of teeth over the entire length in the axial direction in which the rotation axis extends, The covering portion has a protrusion at approximately the midpoint of its total length in the axial direction, which protrudes more than at other points. Electric motor.

2. The protrusions are arranged continuously along the entire radial length of the covering portion. The electric motor according to claim 1.

3. The aforementioned protrusion is part of the overall length of the covering portion in the radial direction and is continuously arranged in the inner portion of the covering portion in the radial direction. The electric motor according to claim 1.

4. The protrusion is positioned at a location where the covering portion covers the side surface of each of the multiple teeth that is located on the leading side in the rotational direction of the rotor. The electric motor according to claim 1.

5. The stator core is divided into a plurality of segmented cores, each including one tooth and a portion of the yoke from which the one tooth protrudes. The insulating component is divided into multiple bobbins that cover one of the teeth included in the divided core and a portion of the yoke from which the one tooth protrudes, thereby insulating it from the winding. The electric motor according to claim 1.

6. The protrusion has a flat surface at its protruding end that is parallel to the axial direction and in contact with the winding. The electric motor according to any one of claims 1 to 5.

7. The aforementioned protrusions are smoothly and seamlessly continuous with the parts of the covering other than the protrusions at both ends in the axial direction. The electric motor according to claim 6.

8. A cylindrical airtight container, A compression mechanism that compresses the refrigerant inside the sealed container and discharges the compressed refrigerant into the sealed container, The electric motor according to claim 1, which is housed in the sealed container and drives the compression mechanism, is provided. Compressor.

9. A circulating circuit is formed in which the refrigerant circulates, and a condenser, expansion device, and evaporator are connected. The compressor according to claim 8, which is connected to the circulation circuit between the condenser and the evaporator, comprises Refrigeration cycle device.

10. In a stator core of an electric motor having a cylindrical yoke concentrically surrounding the rotor, a plurality of teeth projecting radially inward from the yoke and spaced apart in the circumferential direction of the yoke, a plurality of slots formed between adjacent teeth in the circumferential direction, and windings wound around each of the plurality of teeth and housed in the slots, an insulating component that covers the yoke and each of the plurality of teeth to insulate them from the windings, It comprises a yoke portion that covers the yoke and a tooth portion that covers each of the plurality of teeth, The teeth portion has at least a covering portion that covers the circumferential side surface of each of the plurality of teeth over the entire length in the axial direction in which the central axis of the yoke extends, The covering portion has a protrusion at approximately the midpoint of its overall length in the axial direction, which protrudes more in the circumferential direction than at other locations. Insulating components.

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