Electric motor, compressor, and method for manufacturing electric motor

Abstract

To provide a motor in which an insulator can be prevented from falling off from a split core when a stator is formed.SOLUTION: In an electric motor, a stator includes a split core including a split yoke portion and a tooth base portion extending radially inward from the split yoke portion, an electrical insulator, and a stator winding. The electrical insulator includes a first insulating portion disposed at an end of the split core on the first axial side, a second insulating portion disposed at an end of the split core on the second axial side, and a third insulating portion configured to electrically insulate a side surface of the tooth base portion on the first circumferential side and a side surface of the tooth base portion on the second circumferential side from the stator winding. The third insulating portion includes a first side surface insulator disposed on a side surface of the tooth base portion on the first circumferential side, a second side surface insulator disposed on a side surface of the tooth base portion on the second circumferential side, and a connecting portion connecting the first side surface insulator and the second side surface insulator. The first insulating portion has a through hole passing through the first insulating portion in the circumferential direction, and the connecting portion is disposed in the through hole.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to electric motors, compressors, and methods of manufacturing electric motors. [Background technology]

[0002] Electric motors are known that include a cylindrical stator formed by combining multiple split stators in an annular shape. Each split stator includes a split core including a yoke portion and teeth, an insulating member, and a winding wound around the split core via the insulating member. The insulating member includes an end insulator and a slot insulator. The winding is wound around the split core with the end insulators disposed at both axial ends of the split core and the slot insulators disposed on the side surfaces of the teeth. For example, Patent Document 1 discloses a technique in which a protrusion is provided on the end insulator and the winding is wound with the slot insulator inserted between the protrusion and the split core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 009521 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional techniques, slot insulators are not sufficiently fixed to the split cores. If the slot insulators are simply inserted between the protrusions and the split cores, there is a possibility that the slot insulators may fall off the stator core when windings are wound around the split cores. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one aspect of the present disclosure, there is provided an electric motor including a stator having a cylindrical shape extending in an axial direction and a rotor. In this electric motor, the stator includes a split core including split yoke portions connected in an annular shape to form a yoke and tooth bases extending radially inward from the split yoke portions, an electrical insulator attached to the split core, and a stator winding wound around the split core via the electrical insulator. The electrical insulator includes a first insulating portion disposed at an end of the split core on a first axial side, a second insulating portion disposed at an end of the split core on a second axial side opposite the first axial side, and a third insulating portion configured to electrically insulate the stator winding from a side surface of the tooth base on the first circumferential side and a side surface of the tooth base on the second circumferential side opposite the first circumferential side. The third insulating portion includes a first side surface insulator arranged on a side surface of the tooth base on a first circumferential side, a second side surface insulator arranged on a side surface of the tooth base on a second circumferential side, and a connecting portion connecting the first side surface insulator and the second side surface insulator. The first insulating portion has a through hole that passes through the first insulating portion in the circumferential direction. The connecting portion is arranged in the through hole. In this embodiment of the electric motor, the connecting portion can be disposed in the through-hole of the first insulating portion. By supporting the connecting portion in the first insulating portion, it is possible to suppress or prevent the first and second side surface insulators from falling off the split cores during formation of the stator. (2) In the electric motor of the above aspect, the first insulating portion may include an inner insulating portion arranged to cover an end portion of the split core on a first axial side, and an outer insulating portion arranged on the first axial side of the inner insulating portion and having an outer facing surface facing the inner insulating portion. The inner insulating portion may have an inner facing surface facing the outer insulating portion. The through hole may be defined by the inner facing surface and the outer facing surface. According to the electric motor of this aspect, the connecting portion can be disposed in the through hole by the simple method of disposing the connecting portion between the inner facing surface of the inner insulating portion and the outer facing surface of the outer insulating portion. (3) In the electric motor of the above aspect, at least one of the inner opposing surface and the outer opposing surface may have a groove formed along a circumferential direction, and the through hole may be defined by the groove. According to the electric motor of this aspect, the connecting portion can be disposed in the through hole by the simple method of disposing the connecting portion in the groove portion. (4) In the electric motor of the above aspect, the outer facing surface may have a protruding portion protruding toward the split core. The inner facing surface may have an opening through which the protruding portion can be inserted. An end of the split core on a first axial side may have a recess corresponding to the protruding portion. According to the electric motor of this aspect, the three members, namely the outer insulating portion, the inner insulating portion, and the split core, can be fixed together by utilizing the protrusion. (5) In the electric motor of the above aspect, the outer facing surface may have an outer fitting portion having a convex or concave shape, and the inner facing surface may have an inner fitting portion having a convex or concave shape corresponding to the outer fitting portion. According to the electric motor of this aspect, the first insulating portion can be formed by the simple method of fitting the outer fitting portion and the inner fitting portion together. (6) In the electric motor of the above aspect, the split core may have tooth tip portions connected to radially inner tips of the tooth base portions. The first insulating portion may have an outer wall portion arranged at an end of the split yoke portion on the first axial side, a body portion arranged at an end of the tooth base portion on the first axial side, and an inner wall portion arranged at an end of the tooth tip portions on the first axial side. The through hole may be arranged in the body portion of the first insulating portion. According to the electric motor of this aspect, the first side surface insulator and the second side surface insulator can be easily disposed on the first side surface and the second side surface of the tooth base. (7) In the electric motor of the above form, the inner wall portion may have a first side protrusion arranged at the end of the inner wall portion on the first circumferential side, protruding toward the second axial side, and contacting the end of the tooth tip portion on the first circumferential side, and a second side protrusion arranged at the end of the inner wall portion on the second circumferential side, protruding toward the second axial side, and contacting the end of the tooth tip portion on the second circumferential side. According to the electric motor of this aspect, the first side protrusion and the second side protrusion can suppress or prevent the first insulating portion from rotating in the circumferential direction relative to the divided core. (8) In the electric motor of the above aspect, the split core may have tooth tip portions connected to radially inner tips of the tooth bases. The tooth tip portions may have first flange portions extending from the tooth bases toward a first circumferential side and second flange portions extending from the tooth bases toward a second circumferential side. The first side surface insulators may have a first wall portion arranged opposite a first inner circumferential surface of the split yoke portion extending from the tooth bases toward the first circumferential side, a second wall portion arranged opposite an outer circumferential surface of the first flange, and a side wall portion arranged opposite a side surface of the tooth bases toward the first circumferential side. The second side surface insulator may have a first wall portion arranged opposite a second inner peripheral surface of the split yoke portion extending from the tooth base toward a second circumferential side, a second wall portion arranged opposite an outer peripheral surface of the second flange portion, and a side wall portion arranged opposite a side surface of the tooth base on the second circumferential side. (9) In the electric motor of the above configuration, the radial center of the connecting portion may be positioned either radially outward or radially inward from the radial center of the side wall portion of the first side insulator, or radially outward or radially inward from the radial center of the side wall portion of the second side insulator. According to the electric motor of this aspect, it is possible to suppress or prevent an operational error such as arranging the third insulating portion in the opposite direction to the divided core in the radial direction. (10) According to another aspect of the present disclosure, there is provided a compressor including a compression mechanism that compresses and delivers a fluid and an electric motor that drives the compression mechanism. This compressor may include the electric motor according to any of the above aspects. The present disclosure can be realized in various forms other than electric motors and compressors, such as a stator, a method for manufacturing a stator, a split stator, a method for manufacturing a split stator, a method for manufacturing an electric motor, a method for manufacturing a compressor, etc. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is an explanatory diagram showing the internal structure of a compressor including a motor according to the first embodiment. [Figure 2] FIG. 2 is an explanatory diagram showing the configuration of a stator included in the motor according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 2 is an explanatory diagram showing the external configuration of a split stator. [Figure 5] FIG. 2 is an explanatory diagram showing the external configuration of a split core. [Figure 6] FIG. [Figure 7] FIG. 4 is an explanatory diagram showing the external configuration of a second insulating part. [Figure 8] FIG. 4 is an explanatory diagram showing the external configuration of a first insulating portion on a first side in the axial direction. [Figure 9] FIG. 4 is an explanatory diagram showing the configuration of a side surface of a first insulating part. [Figure 10] FIG. 4 is an explanatory diagram showing the external configuration of the first insulating portion on a second axial side. [Figure 11] FIG. 4 is an explanatory diagram showing the configuration of an inner insulating portion and an outer insulating portion. [Figure 12] FIG. 4 is an explanatory diagram showing the configuration of a first axial side of an inner insulating portion. [Figure 13] FIG. 4 is an explanatory diagram showing the external configuration of a third insulating part. [Figure 14] FIG. 4 is a plan view showing the configuration of the third insulating portion on the first axial side. [Figure 15] 5A to 5C are process diagrams showing the manufacturing process of the motor. [Figure 16]FIG. [Figure 17] FIG. [Figure 18] FIG. 10 is an explanatory diagram showing the configuration of a first insulating part included in a motor according to a second embodiment. [Figure 19] FIG. 4 is an explanatory diagram showing the configuration of the lower surface of the first insulating part. [Figure 20] FIG. 10 is an explanatory diagram showing a modified example of the first insulating portion shown in the second embodiment. [Figure 21] FIG. 10 is an explanatory diagram showing the configuration of a first insulating part included in a motor according to a third embodiment. [Figure 22] FIG. 10 is an explanatory diagram showing the configuration of a first insulating part included in a motor according to a fourth embodiment. [Figure 23] FIG. 11 is an explanatory diagram showing the external configuration of a first insulating part included in a motor according to a fifth embodiment. [Figure 24] FIG. 4 is an explanatory diagram showing the configuration of a first side protrusion and a second side protrusion. [Figure 25] FIG. 10 is an explanatory diagram showing the configuration of a fitting hole as a first modified example. [Figure 26] FIG. 10 is an explanatory diagram showing the configuration of a notch as a second modified example. [Figure 27] FIG. 10 is an explanatory diagram showing the configuration of a fitting hole as a third modified example. [Figure 28] FIG. 10 is an explanatory diagram showing the configuration of a fitting hole as a fourth modified example. [Figure 29] 10A to 10C are process diagrams showing a modified example of the motor manufacturing process. [Figure 30] FIG. 10 is an explanatory view showing the configuration of a first axial side of an inner insulating portion according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] A. First embodiment: A1. Compressor 300 and motor 310 configuration: 1 is an explanatory diagram showing the internal structure of a compressor 300 including a motor 310 according to a first embodiment of the present disclosure. The compressor 300 is, for example, a scroll-type electric compressor. The compressor 300 is mounted, for example, on a vehicle (not shown) and functions as a refrigerant circuit of a vehicle air conditioner together with, for example, an evaporator, an expansion valve, and a condenser.

[0009] 1, compressor 300 includes housing 301, motor 310, compression mechanism 320 that compresses and discharges fluid, drive shaft 330, and power supply circuit 340. Housing 301 accommodates motor 310 and compression mechanism 320. Housing 301 is formed with suction port 302, motor chamber 303 in which motor 310 is disposed, and discharge port 305.

[0010] The suction port 302 communicates with the motor chamber 303. The suction port 302 is connected to, for example, an evaporator (not shown), and receives refrigerant supplied from the evaporator and causes it to flow into the motor chamber 303. The discharge port 305 discharges the high-pressure refrigerant compressed by the compression mechanism 320 to the outside of the compressor 300. The discharge port 305 is connected to, for example, a condenser (not shown).

[0011] The drive shaft 330 is a substantially cylindrical member that extends along the rotation axis AX. The drive shaft 330 is supported within the housing 301 so as to be rotatable around the rotation axis AX. An eccentric pin 332 having a substantially cylindrical shape is formed on the end of the drive shaft 330. The eccentric pin 332 is positioned at a position offset a predetermined distance from the rotation axis AX.

[0012] The motor 310 generates a driving force that rotates the drive shaft 330 around the rotation axis AX. The motor 310 is an example of an "electric motor." In this embodiment, an example will be described in which the motor 310 is an inner rotor type. The motor 310 has a stator 100 having a substantially cylindrical shape and a rotor 200. Note that the motor 310 may also be an outer rotor type.

[0013] The stator 100 is fixed to the motor chamber 303. The stator 100 is electrically connected to a power supply circuit 340. The power supply circuit 340 is, for example, an inverter configured to control the motor 310.

[0014] The rotor 200 is disposed inside the stator 100 and is rotatable relative to the stator 100. The rotor 200 includes a cylindrical rotor core 24, a magnet 22 fixed inside the rotor core 24, and a drive shaft 330 fixed to the center of the rotor core 24. The rotor core 24 is formed by laminating iron core pieces formed from electromagnetic steel sheets. The magnet 22 is a permanent magnet containing, for example, neodymium, iron, and boron. The magnet 22 has a long, flat plate shape that extends along the axial direction of the rotor core 24. Rotation of the rotor 200 causes the drive shaft 330 to rotate about the rotation axis AX.

[0015] The compression mechanism 320 includes a fixed scroll 322 and a movable scroll 324. The movable scroll 324 is connected to the drive shaft 330 via an eccentric pin 332. The fixed scroll 322 is fixed to the housing 301. A communication passage 304 is formed in the fixed scroll 322. The fixed scroll 322 and the movable scroll 324 each include a wall surface arranged in a spiral shape, and the spiral wall surfaces are arranged so as to mesh with each other. As a result, a compression chamber capable of compressing a refrigerant is formed between the fixed scroll 322 and the movable scroll 324. When the motor 310 is operated and the drive shaft 330 rotates around the rotation axis AX, the movable scroll 324 rotates, and the refrigerant in the compression chamber is compressed. The compressed refrigerant is discharged from the compression mechanism 320 through the communication passage 304 to the discharge port 305.

[0016] A2. Stator 100 configuration: 2 is an explanatory diagram showing the configuration of a stator 100 included in a motor 310 according to the first embodiment. Note that in FIG. 2, the stator windings 90 are omitted from the illustration in order to facilitate understanding of the technology.

[0017] Each figure, including FIG. 2, schematically illustrates three directions used in this disclosure. The "axial direction DZ" refers to the axial direction of the rotational axis AX of the rotor 200. The side of the axial direction DZ where the first insulating part 71 is disposed relative to the stator core 80 is defined as the "axial first side Z1," and the opposite side is defined as the "axial second side Z2." When the motor 310 is disposed with the rotational axis AX aligned vertically, the axial first side Z1 may also be referred to as the "upper side," and the axial second side Z2 may also be referred to as the "lower side." The "circumferential direction DX" refers to the circumferential direction centered on the rotational axis AX. When viewing the motor 310 from the axial first side Z1 in the circumferential direction DX, the counterclockwise direction is defined as the "circumferential first side X1," and the clockwise direction is defined as the "circumferential second side X2." The "radial direction DY" refers to the direction passing through the rotational axis AX and perpendicular to the rotational axis AX. The radial direction DY refers to the radial direction centered on the rotation axis AX. In the radial direction DY, the side of the rotation axis AX with respect to a predetermined reference position is defined as the "radially inner side Y2," and the opposite side is defined as the "radially outer side Y1."

[0018] As shown in Fig. 2, the stator 100 includes a plurality of stator segments 10. In the example of Fig. 2, the stator 100 includes 12 stator segments 10. The plurality of stator segments 10 are connected in an annular shape to form the stator 100 having a substantially cylindrical shape.

[0019] Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. As shown in Figs. 2 and 3, the stator 100 includes a stator core 80, electrical insulators 70, and a stator winding 90.

[0020] The stator core 80 has a yoke 82 extending in the circumferential direction DX and a plurality of teeth 84 extending radially inward Y2 from the inner peripheral surface of the yoke 82. The stator core 80 is formed by connecting a plurality of split cores 800 in an annular shape.

[0021] 3, each split core 800 includes a split yoke portion 820 and one tooth 84. A plurality of split yoke portions 820 are connected in an annular shape to form a yoke 82 having a substantially cylindrical shape. In this embodiment, each split core 800 is provided with one tooth 84, and the number of teeth 84 matches the number of split cores 800.

[0022] The stator windings 90 are arranged in the slots 60 shown in Fig. 3. In each of the stator segments 10, the stator windings 90 are wound around the teeth 84 via electrical insulators 70 using a concentrated winding method, forming a coil for each stator segment 10.

[0023] A3. Configuration of split stator 10: 4 is an explanatory diagram showing the external configuration of the split stator 10. The split stator 10 includes a split core 800, an electrical insulator 70, and a stator winding 90 (not shown).

[0024] 5 is an explanatory diagram showing the external configuration of the split core 800. The split core 800 is formed by laminating multiple electromagnetic steel sheets. The split core 800 includes a split yoke portion 820, teeth 84, and fitting holes 860. The teeth 84 extend from the inner circumferential surface of the split yoke portion 820 on the radially inner side Y2 toward the radially inner side Y2. The teeth 84 include tooth base portions 842 and tooth tip portions 844.

[0025] 6 is a plan view of the split core 800. The tooth bases 842 extend from the inner circumferential surface of the split yoke portion 820 on the radially inner side Y2 toward the radially inner side Y2. The tooth bases 842 have a first side surface TS1 on the first circumferential side X1 and a second side surface TS2 on the second circumferential side X2. Of the inner circumferential surface on the radially inner side Y2 of the split yoke portion 820, the inner circumferential surface that extends from the tooth bases 842 toward the first circumferential side X1 and is continuous with the first side surface TS1 is also referred to as the "first inner circumferential surface WY1." Furthermore, the inner circumferential surface that extends from the tooth bases 842 toward the second circumferential side X2 and is continuous with the second side surface TS2 is also referred to as the "second inner circumferential surface WY2."

[0026] The tooth tip portions 844 are connected to the tips of the tooth base portions 842 on the radially inner side Y2. As shown in Fig. 6, the tooth tip portions 844 include a first flange portion 844F1 extending from the tips of the tooth base portions 842 toward the first circumferential side X1, and a second flange portion 844F2 extending from the tips of the tooth base portions 842 toward the second circumferential side X2. A tip surface 844W on the radially inner side Y2 of the tooth tip portions 844 faces the rotor 200 and defines a space in which the rotor 200 is rotatably disposed. The wall surface on the radially outer side Y1 of the first flange portion 844F1 is also referred to as the "first outer peripheral surface WE1," and the wall surface on the radially outer side Y1 of the second flange portion 844F2 is also referred to as the "second outer peripheral surface WE2."

[0027] The fitting hole 860 is formed on the surface of the split core 800 on the first axial side Z1. The fitting hole 860 has a bottom and a concave shape facing the second axial side Z2. As will be described later, the fitting hole 860 fits with a protrusion 715 formed on the first insulating part 71. The fitting hole 860 is an example of a "recess." Note that a fitting hole for fitting with a protrusion formed on the second insulating part 72 may be formed on the surface of the split core 800 on the second axial side Z2.

[0028] The fitting holes 860 are preferably positioned so as not to intersect with the magnetic flux generated by the stator winding 90. For example, as shown in region AR in Fig. 6, the fitting holes 860 are preferably positioned at the center of the tooth bases 842 in the circumferential direction DX and radially outward Y1 from the tooth bases 842. This configuration can prevent the protrusions 715 inserted into the fitting holes 860 from interfering with the magnetic flux passing through the split core 800.

[0029] A4. Composition of electrical insulator 70: The configuration of the electrical insulator 70 will be described with reference to FIGS. 7 to 14 in addition to FIG. 4. As shown in FIG. 4, the electrical insulator 70 is arranged to cover the split core 800 to electrically insulate the stator winding 90 from the split core 800. The electrical insulator 70 is formed from a resin having insulating properties. The electrical insulator 70 is also sometimes called a "resin bobbin." As shown in FIG. 4, the electrical insulator 70 includes a first insulating portion 71, a second insulating portion 72, and a third insulating portion 73.

[0030] 7 is an explanatory diagram showing the external configuration of the second insulating portion 72. As shown in FIG. 4, the second insulating portion 72 is disposed at the end of the split core 800 on the second axial side Z2. The second insulating portion 72 is formed of, for example, polyethylene sulfide (PPS), syndiotactic polystyrene (SPS), polybutylene terephthalate (PBT), liquid crystal polymer (LCP), or the like. The second insulating portion 72 includes a second outer wall portion 722, a second body portion 724, and a second inner wall portion 726.

[0031] The second outer wall portion 722 is disposed at the end of the split yoke portion 820 on the second axial side Z2. The second outer wall portion 722 is a plate-shaped member extending toward the second axial side Z2. Note that the second outer wall portion 722 does not have to cover the entire end of the split yoke portion 820 on the second axial side Z2.

[0032] The second inner wall portion 726 is disposed at the end of the tooth tip portion 844 on the second axial side Z2. The second inner wall portion 726 is a plate-like member extending toward the second axial side Z2, and is disposed so as to face the second outer wall portion 722. The width of the second inner wall portion 726 in the circumferential direction DX is approximately the same as the width of the tooth tip portion 844 in the circumferential direction DX.

[0033] The second body portion 724 is disposed at the end of the tooth base portion 842 on the second axial side Z2. The second body portion 724 extends along the radial direction DY and connects the second outer wall portion 722 and the second inner wall portion 726. The second body portion 724 electrically insulates the end of the split core 800 on the second axial side Z2 from the stator winding 90.

[0034] 8 is an explanatory diagram showing the external configuration of the first insulating portion 71 on the first axial side Z1. As shown in FIG. 4, the first insulating portion 71 is disposed at the end of the split core 800 on the first axial side Z1. The first insulating portion 71 can be formed using, for example, the same material as the second insulating portion 72. The first insulating portion 71 includes a first outer wall portion 712, a first body portion 714, a first inner wall portion 716, and a through hole 718.

[0035] The first outer wall portion 712 is disposed at the end of the split yoke portion 820 on the first axial side Z1. The first outer wall portion 712 is a plate-shaped member extending toward the first axial side Z1. Note that the first outer wall portion 712 does not have to cover the entire end of the split yoke portion 820 on the first axial side Z1.

[0036] The first inner wall portion 716 is disposed at the end of the tooth tip portion 844 on the first axial side Z1. The first inner wall portion 716 is a plate-like member extending toward the first axial side Z1, and is configured to face the first outer wall portion 712. The width of the first inner wall portion 716 in the circumferential direction DX is approximately the same as the width of the tooth tip portion 844 in the circumferential direction DX.

[0037] The first body portion 714 is disposed at the end of the tooth base portion 842 on the first axial side Z1. The first body portion 714 extends along the radial direction DY and connects the first outer wall portion 712 and the first inner wall portion 716. The first body portion 714 electrically insulates the end of the split core 800 on the first axial side Z1 from the stator winding 90.

[0038] The through hole 718 penetrates the first insulating portion 71 along the circumferential direction DX. In the example of Fig. 8, the through hole 718 penetrates the first body portion 714 of the first insulating portion 71 along the circumferential direction DX. When the surface on the second axial side Z2 of the first insulating portion 71 is defined as the "lower surface 71BT," the through hole 718 is formed at a position that is 0.2 mm or more and 2.0 mm or less above the lower surface 71BT.

[0039] 9 is an explanatory diagram showing the configuration of a side surface of the first insulating portion 71. In this embodiment, the first insulating portion 71 is formed of two components: an inner insulating portion 711 and an outer insulating portion 710. The inner insulating portion 711 is arranged so as to cover the end portion of the divided core 800 on the first axial side Z1. The outer insulating portion 710 is arranged on the first axial side Z1 of the inner insulating portion 711. In other words, the inner insulating portion 711 is a portion of the first insulating portion 71 arranged on the second axial side Z2, and the outer insulating portion 710 is a portion of the first insulating portion 71 arranged on the first axial side Z1.

[0040] 10 is an explanatory diagram showing the external configuration of the first insulating portion 71 on the second axial side Z2. As shown in FIG. 10, in this embodiment, the first insulating portion 71 further includes a protruding portion 715. The protruding portion 715 protrudes from the lower surface 71BT toward the divided core 800 on the second axial side Z2. The portion of the protruding portion 715 that protrudes from the lower surface 71BT functions as a "protruding portion."

[0041] The protrusion 715 is fitted into a fitting hole 860 formed on the first axial side Z1 of the split core 800 shown in Figures 5 and 6. By simply fitting the protrusion 715 into the fitting hole 860, the first insulating portion 71 can be fixed to the split core 800 when assembling the split stator 10.

[0042] The protrusion 715 can be set to any shape that corresponds to the shape of the fitting hole 860. In the example of FIG. 10 , the protrusion 715 has an external shape that is approximately a square prism. By making the shape of the protrusion 715 a square prism, for example, it is possible to suppress or prevent the first insulating part 71 from rotating relative to the split core 800 when the protrusion 715 is fitted into the fitting hole 860. It is also possible to improve the accuracy of aligning the first insulating part 71 with the fitting hole 860 when fixing the first insulating part 71 to the split core 800.

[0043] 11 is an explanatory diagram showing the configurations of the inner insulating portion 711 and the outer insulating portion 710. Fig. 11 shows a state in which the inner insulating portion 711 has been slid toward the second axial side Z2 relative to the outer insulating portion 710. An outer facing surface 710BT on the second axial side Z2 of the outer insulating portion 710 faces an inner facing surface 711U on the first axial side Z1 of the inner insulating portion 711. The surface opposite the inner facing surface 711U functions as a lower surface 71BT of the first insulating portion 71 that faces the split core 800.

[0044] FIG. 12 is an explanatory diagram showing the configuration of the inner insulating portion 711 on the first axial side Z1. As shown in FIG. 12, the inner insulating portion 711 includes an inner outer wall portion 712U, an inner trunk portion 714U, and an inner inner wall portion 716U. As shown in FIGS. 11 and 12, when the outer insulating portion 710 and the inner insulating portion 711 are viewed along the axial direction DZ, the outer shape of the outer insulating portion 710 and the inner insulating portion 711 are configured to match each other. The inner outer wall portion 712U, the inner trunk portion 714U, and the inner inner wall portion 716U are portions of the first insulating portion 71 that correspond to the ends of the first outer wall portion 712, the first trunk portion 714, and the first inner wall portion 716 on the second axial side Z2.

[0045] An opening 719 and a groove 718R are formed in the inner facing surface 711U of the inner insulating portion 711. The groove 718R has a concave shape that faces the second axial side Z2 relative to the inner facing surface 711U. The groove 718R is formed along the circumferential direction DX from the end of the inner body portion 714U on the first circumferential side X1 to the end of the inner body portion 714U on the second circumferential side X2. Therefore, when the first insulating portion 71 is formed by the inner insulating portion 711 and the outer insulating portion 710, the groove 718R, together with the outer facing surface 710BT of the outer insulating portion 710, defines a through hole 718, as shown in FIG.

[0046] As will be described later, the shape of the groove 718R is configured to correspond to the shape of the connecting portion 733 of the third insulating portion 73. Specifically, the depth of the groove 718R in the axial direction DZ is approximately the same as the thickness of the connecting portion 733 in the axial direction DZ, and the width of the groove 718R in the radial direction DY is approximately the same as the width of the connecting portion 733 in the radial direction DY. As a result, the connecting portion 733 can be disposed in the through hole 718 along the circumferential direction DX. Note that the groove 718R does not necessarily have to have the same shape as the connecting portion 733, and may be larger than the connecting portion 733.

[0047] 12, the opening 719 is a through-hole that penetrates from the inner facing surface 711U to the bottom surface 71BT. The outer shape of the opening 719 is formed to correspond to the cross-sectional shape of the protruding portion 715 that is perpendicular to the axial direction DZ. As a result, as shown in FIGS. 10 and 11, the protruding portion 715 can be inserted through the opening 719, and the inner insulating portion 711 and the outer insulating portion 710 can be fitted together.

[0048] In this embodiment, as shown in FIG. 11 , the length of the protrusion 715 in the axial direction DZ is configured to be longer than the depth of the opening 719 in the axial direction DZ, i.e., the thickness of the inner insulating portion 711 in the axial direction DZ. The protrusion 715 is inserted into the opening 719, and the inner insulating portion 711 is moved toward the first axial side Z1 until the inner opposing surface 711U and the outer opposing surface 710BT come into contact with each other. At this time, the protrusion 715 protrudes from the lower surface 71BT toward the second axial side Z2. As described above, the portion of the protrusion 715 protruding from the lower surface 71BT is fitted into the fitting hole 860 of the split core 800.

[0049] As described above, in this embodiment, the protrusion 715 is configured to pass through the opening 719 and fit into the fitting hole 860 of the split core 800. That is, one protrusion 715 can be used to efficiently fix the three components, the outer insulating portion 710, the inner insulating portion 711, and the split core 800. Furthermore, when forming the split stator 10, the accuracy of mutual alignment of the three components, the outer insulating portion 710, the inner insulating portion 711, and the split core 800, can be improved. Furthermore, if it is difficult to form the groove 718R and the protrusion 715 in different positions due to the configuration of the outer insulating portion 710 and the inner insulating portion 711, the opening 719 may be formed within the area where the groove 718R is formed. The protrusion 715 is formed at a position corresponding to the opening 719. In this case, the four members, namely, the outer insulating portion 710, the inner insulating portion 711, the divided core 800, and the connecting portion 733 of the third insulating portion 73, can be fixed together using the protruding portion 715.

[0050] 13 is an explanatory diagram showing the external configuration of the third insulating portion 73. The third insulating portion 73 is formed of, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyester, etc. As shown in FIG. 13, the third insulating portion 73 includes a first side surface insulator 731, a second side surface insulator 732, and a connecting portion 733.

[0051] 13, the first side surface insulator 731 and the second side surface insulator 732 are sheet-like or film-like members that are long along the axial direction DZ. The first side surface insulator 731 and the second side surface insulator 732 have substantially the same shape, but are arranged at different positions and in different orientations relative to the split core 800. The connecting portion 733 is a sheet-like or film-like member that connects the first side surface insulator 731 and the second side surface insulator 732. The thicknesses of the first side surface insulator 731, the second side surface insulator 732, and the connecting portion 733 are, for example, not less than 0.2 mm and not more than 0.5 mm.

[0052] 14 is a plan view showing the configuration of the first axial side Z1 of the third insulating portion 73. The first side surface insulator 731 includes a first wall portion 731Y, a second wall portion 731E, and a side wall portion 731S.

[0053] The width W1 of the first wall portion 731Y in the circumferential direction DX is approximately the same as the width of the first inner circumferential surface WY1 of the divided yoke portion 820 shown in Fig. 6. As will be described later, the first wall portion 731Y is disposed opposite the first inner circumferential surface WY1 and covers the entire first inner circumferential surface WY1.

[0054] The width W2 of the second wall portion 731E in the circumferential direction DX is approximately the same as the width of the first outer peripheral surface WE1 of the first flange portion 844F1 in the circumferential direction DX. As will be described later, the second wall portion 731E is disposed to face the first outer peripheral surface WE1 and covers the entire first outer peripheral surface WE1.

[0055] The width W3 in the radial direction DY of the side wall portion 731S is approximately the same as the width in the radial direction DY of the first side surface TS1 of the tooth base 842 shown in Fig. 6. The side wall portion 731S is disposed opposite the first side surface TS1 and covers the entire first side surface TS1. Note that the "width in the radial direction DY of the first side surface TS1" refers to the length in the radial direction DY of the tooth base 842, and is approximately the same as the distance from the inner circumferential surface of the split yoke portion 820 on the radially inner side Y2 to the outer circumferential surface of the tooth tip portion 844 on the radially outer side Y1.

[0056] The second side surface insulator 732 includes a first wall portion 732Y, a second wall portion 732E, and a side wall portion 732S. The first wall portion 732Y is disposed opposite the second inner circumferential surface WY2 of the split yoke portion 820 shown in FIG. 6 and covers the second inner circumferential surface WY2. The second wall portion 732E is disposed opposite the second outer circumferential surface WE2 of the second flange portion 844F2 shown in FIG. 6 and covers the second outer circumferential surface WE2. The side wall portion 732S is disposed opposite the second side surface TS2 of the tooth base 842 shown in FIG. 6 and covers the second side surface TS2. The other configurations of the first wall portion 732Y, the second wall portion 732E, and the side wall portion 732S are similar to those of the first wall portion 731Y, the second wall portion 731E, and the side wall portion 731S of the first side surface insulator 731, and therefore will not be described again.

[0057] As shown in FIG. 14 , the coupling portion 733 extends along the circumferential direction DX and connects the first side surface insulator 731 and the second side surface insulator 732. The width W4 of the coupling portion 733 in the circumferential direction DX is substantially the same as the width of the tooth base 842 in the circumferential direction DX. The width W3Y of the coupling portion 733 in the radial direction DY can be set arbitrarily in consideration of the strength required of the coupling portion 733, the size and shape of the through hole 718, or the position of the coupling portion 733 disposed in the through hole 718. The width W3Y may be configured to be equal to the width W3, for example. Increasing the width of the coupling portion 733 can improve the strength of the coupling portion 733. The through hole 718 is formed at a position corresponding to the position of the coupling portion 733.

[0058] As will be described later, the connecting portion 733 is disposed in the through hole 718 of the first insulating portion 71 shown in FIG. 8 at the timing when the outer insulating portion 710 and the inner insulating portion 711 are fitted together. The connecting portion 733 is disposed in the through hole 718 while being inserted through the through hole 718 from the first circumferential side X1 to the second circumferential side X2 of the through hole 718. The connecting portion 733 disposed in the through hole 718 is supported by the first insulating portion 71 formed by the fitting of the outer insulating portion 710 and the inner insulating portion 711. As a result, when the stator winding 90 is wound around the split core 800 to which the first insulating portion 71, the second insulating portion 72, and the third insulating portion 73 are assembled, it is possible to suppress or prevent the first side surface insulator 731 and the second side surface insulator 732 from falling off from the split core 800.

[0059] 14 shows a center 733CP of the coupling portion 733 in a top view, an end portion 733Y1 of the coupling portion 733 on the radially outer side Y1, and an end portion 733Y2 of the coupling portion 733 on the radially inner side Y2. In this embodiment, the "center 733CP of the coupling portion 733" means the center of the outline of the coupling portion 733 in a top view. However, the "center 733CP of the coupling portion 733" may be the center of the coupling portion 733 in the radial direction DY, or may be a center line connecting the centers of the coupling portion 733 in the radial direction DY.

[0060] In this embodiment, the shape of groove 718R, i.e., the shape of through hole 718, and the shape of connecting portion 733 are configured to be substantially the same. With this configuration, movement of connecting portion 733 within through hole 718 can be restricted. Therefore, rattle of connecting portion 733 relative to first insulating portion 71 can be suppressed. Furthermore, when placing connecting portion 733 in through hole 718, positioning of connecting portion 733 relative to inner insulating portion 711 is facilitated. Note that, provided that connecting portion 733 can be placed in through hole 718, through hole 718 may be configured to be larger than connecting portion 733. With this configuration, the task of placing connecting portion 733 in groove 718R is facilitated.

[0061] 14 , in the radial direction DY, the center 733CP is disposed radially inward Y2 than the center CP of the tooth base 842 in the radial direction DY. That is, the connecting portion 733 is disposed at a position offset radially inward Y2 from the center CP of the tooth base 842. Note that the "center CP of the tooth base 842" may be defined by either the center of the radial direction DY of the side wall 731S of the first side surface insulator 731 or the center of the radial direction DY of the side wall 732S of the second side surface insulator 732. In this embodiment, the center of the radial direction DY of the side wall 731S of the first side surface insulator 731 and the center of the radial direction DY of the side wall 732S of the second side surface insulator 732 coincide with each other.

[0062] Here, when the center 733CP of the connecting portion 733 and the center CP of the tooth base 842 coincide with each other, the connecting portion 733 has a shape that is line-symmetrical about the circumferential direction DX that passes through the center CP. In this case, even if the third insulating portion 73 is erroneously arranged in the opposite direction along the radial direction DY, that is, even if the end portion 733Y1 and the end portion 733Y2 are arranged in the opposite direction, it may be possible to arrange the connecting portion 733 in the through hole 718. In this case, there is a possibility that the third insulating portion 73 will be arranged in the split core 800 while still facing in the opposite direction.

[0063] In contrast, in this embodiment, the center 733CP of the connecting portion 733 is offset radially inward Y2 from the center CP of the tooth base 842. Therefore, for example, if the orientation of the third insulating portion 73 is mistakenly reversed along the radial direction DY, the connecting portion 733 will be offset radially outward Y1 from the center CP. That is, the connecting portion 733 will be offset opposite to its normal position. Therefore, when the connecting portion 733 in this state is placed in the through hole 718, the positions of the first side surface insulator 731 and the second side surface insulator 732 will be reversed in the circumferential direction DX. For example, the first wall portion 731Y and the first wall portion 732Y will protrude radially inward Y2 from the first inner wall portion 716. As a result, the first insulating portion 71 and the third insulating portion 73 cannot be attached to the split core 800 in the appropriate position. Therefore, for example, an operational error such as placing the third insulating portion 73 in the wrong direction relative to the split core 800 can be suppressed or prevented. The center 733CP of the connecting portion 733 may be offset radially outward Y1 from the center CP, with the same effect as above being obtained in this case as well.

[0064] A5. Manufacturing method of motor 310: A method for manufacturing the motor 310 of this embodiment will be described with reference to Figures 15 to 17. Figure 15 is a process chart showing the manufacturing process of the motor 310. The manufacturing method for the motor 310 is an example of a "manufacturing method for an electric motor." The manufacturing method for the electric motor includes a manufacturing method for the stator.

[0065] The split stator forming step S100 and the connecting step S200 are manufacturing steps for the stator 100. In the split stator forming step S100, the split stator 10 shown in Fig. 4 is formed. The split stator forming step S100 includes a preparing step S10, an inserting step S20, an arranging step S30, and a winding step S40. In the preparing step S10, an electrical insulator 70 including a first insulating portion 71, a second insulating portion 72, and a third insulating portion 73, and a split core 800 are prepared.

[0066] FIG. 16 is an explanatory diagram showing an overview of the insertion step S20. As shown in FIG. 16, in the insertion step S20, the connecting portion 733 of the third insulating portion 73 is inserted into the through hole 718 of the first insulating portion 71, thereby forming an assembly AS. Specifically, the connecting portion 733 of the third insulating portion 73 is arranged in the groove portion 718R of the inner insulating portion 711. The protruding portion 715 of the outer insulating portion 710 is inserted into the opening 719 of the inner insulating portion 711 with the connecting portion 733 arranged therein. As a result, the assembly AS is formed. In the assembly AS, a recess ASR is formed between the first side surface insulator 731 and the second side surface insulator 732, the recess ASR being defined by the side wall portion 731S, the side wall portion 732S, and the lower surface 71BT.

[0067] 15, in the arrangement step S30, the assembly AS and the second insulating portion 72 are attached to the split core 800. Specifically, the assembly AS shown in FIG. 16 is arranged on the first axial side Z1 of the split core 800. The assembly AS is moved toward the second axial side Z2, and the tooth bases 842 of the split core 800 are inserted into the recesses ASR of the assembly AS shown in FIG. 16. At this time, the protrusions 715 of the first insulating portion 71 are inserted into the fitting holes 860 of the split core 800. As a result, as shown in FIG. 4, the first insulating portion 71 is fixed to the first axial side Z1 of the split core 800, and the assembly AS is fixed to the split core 800. At this time, the first side surface insulator 731 of the third insulating portion 73 is fixed so as to cover the first inner circumferential surface WY1 of the split yoke portion 820, the first outer circumferential surface WE1 of the first flange portion 844F1, and the first side surface TS1 of the tooth base 842. In addition, the second side surface insulator 732 of the third insulating portion 73 is fixed so as to cover the second inner circumferential surface WY2 of the split yoke portion 820, the second outer circumferential surface WE2 of the second flange portion 844F2, and the second side surface TS2 of the tooth base 842. The second insulating portion 72 is disposed on the second axial side Z2 of the split core 800.

[0068] 17 is an explanatory diagram showing an overview of the winding step S40. In the winding step S40, the stator winding 90 is wound by concentrated winding around the divided core 800 in which the assembly AS and the second insulating portion 72 are arranged, i.e., the divided core 800 to which the electrical insulator 70 is attached.

[0069] The stator winding 90 starts, for example, near the connection point between the tooth base 842 and the split yoke portion 820, and is wound from the starting point along the radially inward direction Y2 on the tooth base 842 to the tooth tip 844. As a result, one layer of the stator winding 90 is formed. Next, a second layer of the stator winding 90 is formed from the tooth tip 844 toward the radially outward direction Y1 of the split yoke portion 820. Thereafter, the stator winding 90 is wound a predetermined number of times in the same manner to form a coil. As a result, the split stator 10 is completed. As shown in FIG. 17 , the stator winding 90 is electrically insulated from the split core 800 by the first side surface insulator 731 and the second side surface insulator 732.

[0070] 15, in the connecting step S200, the formed multiple split stator 10 are connected in an annular shape by welding the side surfaces of the split cores 800 together, for example. As a result, the stator 100 having a substantially cylindrical shape is formed. In the stator arranging step S300, the rotor 200 is arranged inside the stator 100, and the motor 310 is completed.

[0071] A6.Effects: As described above, in the motor 310 of this embodiment, the third insulating portion 73 includes the connecting portion 733 connecting the first side surface insulator 731 and the second side surface insulator 732. The first insulating portion 71 has a through hole 718 that penetrates the first insulating portion 71 along the circumferential direction DX. The connecting portion 733 is disposed in the through hole 718 and is inserted through the through hole 718 from the first circumferential side X1 to the second circumferential side X2. Since the connecting portion 733 is supported by the first insulating portion 71 via the through hole 718, it is possible to suppress or prevent the first side surface insulator 731 and the second side surface insulator 732 of the third insulating portion 73 from falling off the divided core 800 when the stator winding 90 is wound around the divided core 800. Therefore, it is possible to suppress or prevent the first side surface insulator 731 and the second side surface insulator 732 of the third insulating portion 73 from falling off the divided core 800 when the stator winding 90 is wound around the divided core 800.

[0072] In the motor 310 of this embodiment, the first insulating portion 71 includes an inner insulating portion 711 disposed to cover the end of the split core 800 on the first axial side Z1 and facing the outer insulating portion 710, and an outer insulating portion 710 disposed on the first axial side Z1 of the inner insulating portion 711 and having an outer facing surface 710BT facing the inner insulating portion 711. The through hole 718 is defined by the inner facing surface 711U and the outer facing surface 710BT. The connecting portion 733 can be disposed in the through hole 718 by the simple method of disposing the connecting portion 733 between the inner facing surface 711U of the inner insulating portion 711 and the outer facing surface 710BT of the outer insulating portion 710. Therefore, the connecting portion 733 can be supported by the first insulating portion 71 by the simple method.

[0073] According to the motor 310 of this embodiment, the inner opposing surface 711U has a groove 718R formed along the circumferential direction DX, and the through hole 718 is defined by the groove 718R. Because the position of the connecting portion 733 relative to the first insulating portion 71 is defined by the groove 718R, the task of aligning the connecting portion 733 relative to the first insulating portion 71 is facilitated. Furthermore, the connecting portion 733 can be disposed in the through hole 718 by the simple method of disposing the connecting portion 733 in the groove 718R.

[0074] According to the motor 310 of this embodiment, the outer facing surface 710BT has a protrusion 715 that protrudes toward the split core 800. The inner facing surface 711U has an opening 719 through which the protrusion 715 can be inserted. The end of the split core 800 on the first axial side Z1 has a fitting hole 860 corresponding to the protrusion 715. That is, the protrusion 715 that passes through the opening 719 is configured to fit into the fitting hole 860 of the split core 800. Therefore, one protrusion 715 can be used to efficiently fasten the three components, the outer insulating portion 710, the inner insulating portion 711, and the split core 800. Furthermore, when the split stator 10 is formed, the accuracy of relative alignment of the three components, the outer insulating portion 710, the inner insulating portion 711, and the split core 800, can be improved.

[0075] According to the motor 310 of this embodiment, the through hole 718 is formed in the first body portion 714 of the first insulating portion 71. Therefore, the connecting portion 733 is disposed on the first axial side Z1 of the tooth base 842. This allows the first side surface insulator 731 and the second side surface insulator 732 to be easily disposed relative to the first side surface TS1 and the second side surface TS2 located on both sides of the tooth base 842 in the circumferential direction DX.

[0076] According to the motor 310 of this embodiment, the center 733CT of the connecting portion 733 in the radial direction DY is disposed radially inward Y2 from the center CP of the radial direction DY of the side wall portion 731S of the first side surface insulator 731 and the side wall portion 732S of the second side surface insulator 732. This makes it possible to suppress or prevent an operational error such as arranging the third insulating portion 73 in the opposite direction to the split core 800 in the radial direction DY.

[0077] B. Second embodiment: 18 is an explanatory diagram showing the configuration of a first insulating part 71b included in a motor 310 according to the second embodiment. The first insulating part 71b differs from the first insulating part 71 shown in the first embodiment in that it includes an outer insulating part 710b instead of the outer insulating part 710, but other configurations are similar to those of the first insulating part 71. The configuration of the inner insulating part 711 is the same as the configuration of the inner insulating part 711 shown in the first embodiment.

[0078] The outer insulating part 710b differs from the outer insulating part 710 shown in the first embodiment in that it includes a protruding part 715b having a different length in the axial direction DZ instead of the protruding part 715. As shown in Fig. 18, the length of the protruding part 715b in the axial direction DZ is shorter than that of the protruding part 715 and is configured to be approximately the same as the thickness of the inner insulating part 711 in the axial direction DZ.

[0079] FIG. 19 is an explanatory diagram showing the configuration of the lower surface 71BT of the first insulating portion 71b. The first insulating portion 71b shown in FIG. 19 shows a state in which the outer insulating portion 710b and the inner insulating portion 711 are fitted together. As shown in FIG. 19, in this embodiment, the length of the protruding portion 715b in the axial direction DZ is approximately the same as the thickness of the inner insulating portion 711. Therefore, even when the protruding portion 715b is inserted into the opening 719, the protruding portion 715b does not protrude from the lower surface 71BT. In other words, the tip of the protruding portion 715b is flush with the lower surface 71BT. Therefore, in this embodiment, although the outer insulating portion 710b fits with the inner insulating portion 711, the first insulating portion 71b does not fit with the fitting hole 860 of the split core 800. Therefore, the fitting hole 860 of the split core 800 may be omitted.

[0080] As shown in FIG. 18 , in this embodiment, the protrusion 715b is formed on the outer facing surface 710BT and functions as an “outer fitting portion” having a convex shape facing the inner insulating portion 711. The opening 719 is formed on the inner facing surface 711U and functions as an “inner fitting portion” having a concave shape corresponding to the protrusion 715b. The opening 719 may penetrate from the inner facing surface 711U to the underside 71BT along the axial direction DZ, or may have a concave shape with a bottom on the second axial side Z2. Thus, the “inner fitting portion being concave” may refer to both a bottomed portion and a through hole. Furthermore, if it is difficult to form the groove 718R and the protrusion 715b at different positions due to the configuration of the outer insulating portion 710b and the inner insulating portion 711, the opening 719 may be formed within the range where the groove 718R is formed. The protrusion 715b is formed at a position corresponding to the opening 719. In this case, the outer insulating portion 710b, the inner insulating portion 711, and the connecting portion 733 of the third insulating portion 73 can be fixed using one protrusion 715b.

[0081] According to the motor 310 of this embodiment, the first insulating portion 71b can be formed by the simple method of fitting the protrusion 715b into the opening 719. Therefore, the connecting portion 733 can be fixed to the first insulating portion 71b by a simple method. Also, similar to the first embodiment, the outer insulating portion 710b and the inner insulating portion 711 can be easily aligned with each other.

[0082] B2. Variations: FIG. 20 is an explanatory diagram showing a modified example of the first insulating portion 71b shown in the second embodiment. In the second embodiment, the protrusion 715b is formed on the outer insulating portion 710b. In contrast, as in the first insulating portion 71b2 shown in FIG. 20, the protrusion 715b2 may be formed on the inner insulating portion 711b2. In this case, the opening 719b2 is formed in the outer insulating portion 710b2. The depth of the opening 719b2 in the axial direction DZ is configured to be deep enough to accommodate the protrusion 715b2.

[0083] In this embodiment, the opening 719b2 is formed on the outer facing surface 710BT of the outer insulating portion 710b2 and functions as an "outer fitting portion" having a concave shape corresponding to the protrusion 715b2. The protrusion 715b2 is formed on the inner facing surface 711U of the inner insulating portion 711b2 and functions as an "inner fitting portion" having a convex shape toward the outer insulating portion 710b2. Even with this configuration, the same effects as those of the second embodiment are achieved. Furthermore, if it is difficult to form the groove 718R and the protrusion 715b2 in different positions due to the configuration of the outer insulating portion 710b2 and the inner insulating portion 711b2, the protrusion 715b2 may be formed within the range in which the groove 718R is formed. The opening 719b2 is formed at a position corresponding to the protrusion 715b2. In this case, one protrusion 715b2 can be used to fix the outer insulating portion 710b2, the inner insulating portion 711b2, and the connecting portion 733 of the third insulating portion 73. Furthermore, by inserting the connecting portion 733 into the protrusion 715b2, the connecting portion 733 can be placed in the groove 718R. Therefore, the connecting portion 733 can be easily placed in the groove 718R.

[0084] C. Third embodiment: FIG. 21 is an explanatory diagram showing the configuration of a first insulating portion 71c included in a motor 310 according to the third embodiment. The first insulating portion 71c differs from the first insulating portion 71 shown in the first embodiment in that the first insulating portion 71c includes an outer insulating portion 710c instead of the outer insulating portion 710 and an inner insulating portion 711c instead of the inner insulating portion 711. As shown in FIG. 21 , the outer insulating portion 710c does not include a protrusion 715, and the inner insulating portion 711c does not include an opening 719. In this manner, the first insulating portion 71c may be configured without a protrusion or an opening. Alternatively, the first insulating portion 71c may be configured such that the outer insulating portion 710c does not include an outer fitting portion, and the inner insulating portion 711c does not include an inner fitting portion.

[0085] 21, the outer facing surface 710BT of the outer insulating portion 710c and the inner facing surface 711U of the inner insulating portion 711c are brought into contact with each other by manual alignment. As a result, the through hole 718 can be formed in the first insulating portion 71c, as in the first embodiment. Therefore, with the motor 310 configured in this manner, the first insulating portion 71c can have a simple configuration while still being able to form the through hole 718 for arranging the connecting portion 733.

[0086] D. Fourth embodiment: 22 is an explanatory diagram showing the configuration of a first insulating part 71d included in a motor 310 according to the fourth embodiment. The first insulating part 71d differs from the first insulating part 71 shown in the first embodiment in that the outer insulating part 710 is replaced with an outer insulating part 710d, and the inner insulating part 711 is replaced with an inner insulating part 711d.

[0087] 22, in this embodiment, the groove 718R4 is formed in the outer insulating portion 710d instead of the inner insulating portion 711d. In this case, for example, the through hole 718 is defined by the groove 718R4 formed in the outer facing surface 710BT and the flat inner facing surface 711U. Even with this configuration, the same effects as in the first embodiment can be achieved.

[0088] The groove 718R may be formed in both the inner insulating portion 711 and the outer insulating portion 710. For example, the through hole 718 is defined by arranging a groove formed in the inner insulating portion 711 and a groove formed in the outer insulating portion 710 so that they face each other. Even in this configuration, the same effects as in the first embodiment are achieved.

[0089] E. Fifth embodiment: 23 is an explanatory diagram showing the external configuration of a first insulating part 71e included in a motor 310 according to the fifth embodiment. The first insulating part 71e differs from the first insulating part 71 shown in the first embodiment in that the first insulating part 71e includes an inner insulating part 711e instead of the inner insulating part 711, but other configurations are similar to those of the first insulating part 71.

[0090] The inner insulating portion 711e differs from the inner insulating portion 711 shown in the first embodiment in that it includes a first side protrusion 717 and a second side protrusion 713. The width of the inner insulating portion 711e in the circumferential direction DX is configured to be wider than that of the inner insulating portion 711 by a length corresponding to the first side protrusion 717 and the second side protrusion 713. Specifically, in the first embodiment, as shown in FIG. 17 , the inner insulating portion 711 has substantially the same width as the width of the tooth tip portion 844 in the circumferential direction DX (width W6, described later). However, in this embodiment, the inner insulating portion 711e is configured to be wider than the width W6 of the tooth tip portion 844 in the circumferential direction DX.

[0091] The first side protrusion 717 and the second side protrusion 713 are columnar structures that protrude from the end of the inner insulating portion 711e on the second axial side Z2, i.e., from the lower surface 71BT, toward the second axial side Z2. The first side protrusion 717 is provided on the radially inner side Y2 and the lower end of the inner insulating portion 711e on the first circumferential side X1, and the second side protrusion 713 is provided on the radially inner side Y2 and the lower end of the inner insulating portion 711e on the second circumferential side X2. In other words, the first inner wall portion 716 of the first insulating portion 71e is provided with the first side protrusion 717 and the second side protrusion 713 on the first circumferential side X1 and the second circumferential side X2.

[0092] Fig. 24 is an explanatory diagram showing the configuration of the first side protrusion 717 and the second side protrusion 713. As shown in Fig. 24, the first side protrusion 717 and the second side protrusion 713, together with the lower surface 71BT, define a recess 844R.

[0093] A distance W5 from the first side protrusion 717 to the second side protrusion 713 in the circumferential direction DX is configured to be substantially the same as a width W6 of the tooth tip portion 844 in the circumferential direction DX. Therefore, when the first insulating portion 71e is assembled to the split core 800, the first side protrusion 717 and the second side protrusion 713 are arranged on both side surfaces of the tooth tip portion 844 in the circumferential direction DX. In other words, when the first insulating portion 71e is assembled to the split core 800, the end portion of the tooth tip portion 844 on the second axial side Z2 is fitted into the recess 844R.

[0094] According to the motor 310 of this embodiment, the first insulating portion 71e includes a first side protrusion 717 and a second side protrusion 713 that protrude from an end of the inner insulating portion 711e on the second axial side Z2 toward the second axial side Z2. The first side protrusion 717 is provided at a lower end of the inner insulating portion 711e on the first circumferential side X1, and the second side protrusion 713 is provided at a lower end of the inner insulating portion 711e on the second circumferential side X2. The first side protrusion 717 and the second side protrusion 713, together with the lower surface 71BT, define recesses 844R. Therefore, the first insulating portion 71e can be fixed to the split core 800 by simply fitting the ends of the tooth tip portions 844 on the second axial side Z2 into the recesses 844R. Furthermore, rotation of the first insulating portion 71e or the inner insulating portion 711e around the axial direction DZ relative to the split core 800 can be suppressed or prevented. For example, even if a cylindrical protrusion 715 is provided, by providing the first insulating portion 71e with a first side protrusion 717 and a second side protrusion 713, rotation of the first insulating portion 71e relative to the split core 800 can be suppressed or prevented.

[0095] F. Other Embodiments: (F1) In the first embodiment described above, an example was shown in which the protrusion 715 having a substantially rectangular prism shape was formed on the lower surface 71BT of the first insulating part 71, and the fitting hole 860 configured to be able to fit with the protrusion 715 was formed on the surface of the split core 800 on the first axial side Z1. However, the fitting hole 860 and the protrusion 715 may be set to any shape other than a rectangular prism, as exemplified below.

[0096] FIG. 25 is an explanatory diagram showing the configuration of a fitting hole 860f as a first modified example. As in the split core 800f shown in FIG. 25, a fitting hole 860f having a so-called oval shape may be provided. Examples of oval shapes include the rounded rectangle shown in FIG. 25, an egg shape, an oval circle, and an ellipse. Even in this configuration, the first insulating portion 71 can be fixed to the split core 800 by a simple method, as in the first embodiment.

[0097] FIG. 26 is an explanatory diagram showing the configuration of a notch 860g as a second modified example. As in the split core 800g shown in FIG. 24, a notch 860g may be provided that connects the surface on the first axial side Z1 with the surface on the radially outer side Y1. The notch 860g is formed at the end on the radially outer side Y1. This allows the first insulating part 71 to be fixed to the split core 800 by a simple method while arranging the fitted part in a position that is unlikely to intersect with the magnetic flux generated by the stator winding 90. Note that, as shown in FIG. 24, the notch 860g may be formed at both ends of the split core 800g in the axial direction DZ.

[0098] FIG. 27 is an explanatory diagram showing the configuration of a fitting hole 860h as a third modified example. As with the split core 800h shown in FIG. 27, a plurality of fitting holes 860h may be provided. Each of the fitting holes 860h has a substantially cylindrical shape. In the example of FIG. 27, two fitting holes 860h are arranged along the radial direction DY. Even with this configuration, as with the first embodiment, when the first insulating portion 71 is fixed to the split core 800h, it is possible to prevent the first insulating portion 71 from rotating around the protruding portion 715.

[0099] FIG. 28 is an explanatory diagram showing the configuration of a fitting hole 860i as a fourth modified example. As in the split core 800i shown in FIG. 28, a fitting hole 860i having a substantially triangular prism shape may be provided. Even in this configuration, the first insulating portion 71 can be fixed to the split core 800i by a simple method, as in the first embodiment. Furthermore, when fixing the first insulating portion 71 to the split core 800i, the first insulating portion 71i can be prevented from rotating around the protrusion 715. The fitting hole 860f, the notch 860g, the fitting hole 860h, and the fitting hole 860i are examples of "fitted portions."

[0100] (F2) Figure 29 is a process diagram showing a modified example of the manufacturing process for the motor 310. In the manufacturing method for the electric motor according to the first embodiment, an example has been described in which the insertion process S20 is performed followed by the placement process S30. However, the insertion process S32 may be configured to be performed midway through the placement process S30j. In other words, the insertion process S32 and the placement process S30j may be configured as a single process.

[0101] In the first embodiment described above, an example was shown in which the assembly AS is formed in the insertion step S20 by placing the connecting portion 733 of the third insulating portion 73 in the through hole 718 of the first insulating portion 71. In the arrangement step S30, an example was shown in which the assembly AS and the second insulating portion 72 are attached to the split core 800. In contrast, in the present embodiment, as shown in Fig. 29 , in the arrangement step S30j, first, the inner insulating portion 711 of the first insulating portion 71 and the second insulating portion 72 are attached to the split core 800.

[0102] Next, in an insertion step S32, the connecting portion 733 of the third insulating portion 73 is placed in the groove 718R of the inner insulating portion 711 attached to the split core 800. At this time, the first side surface insulator 731 of the third insulating portion 73 is placed so as to cover the first inner circumferential surface WY1 of the split yoke portion 820, the first outer circumferential surface WE1 of the first flange portion 844F1, and the first side surface TS1 of the tooth base 842. Furthermore, the second side surface insulator 732 of the third insulating portion 73 is placed so as to cover the second inner circumferential surface WY2 of the split yoke portion 820, the second outer circumferential surface WE2 of the second flange portion 844F2, and the second side surface TS2 of the tooth base 842. The outer insulating portion 710 is fitted into the inner insulating portion 711 with the connecting portion 733 placed in the groove 718R. As a result, the first insulating portion 71 with the connecting portion 733 inserted into the through-hole 718 is fixed to the split core 800.

[0103] As described above, the order of the placement step and the insertion step may be changed arbitrarily. Even in such a configuration, the same effects as those of the first embodiment can be achieved.

[0104] (F4) FIG. 30 is an explanatory diagram showing the configuration of the first axial side Z1 of an inner insulating portion 711j according to a modified example. In the first embodiment described above, an example was shown in which the protrusion 715 of the outer insulating portion 710 is configured to penetrate an opening 719 provided in a position different from the groove 718R in the inner insulating portion 711. In contrast, as in the inner insulating portion 711j shown in FIG. 30, an opening 719j may be formed in the area where the groove 718R is formed. In this case, a through hole 718 for inserting the protrusion 715 is formed in the connecting portion 733 at a position corresponding to the opening 719j. The through hole 718 formed in the connecting portion 733 is formed to have substantially the same shape as or larger than the opening 719j. With this configuration, one protrusion 715 can be used to efficiently fix the four members: the outer insulating portion 710, the inner insulating portion 711j, the connecting portion 733 of the third insulating portion 73, and the split core 800.

[0105] (F5) In the first embodiment described above, an example was shown in which the first insulating portion 71 can be disassembled into the outer insulating portion 710 and the inner insulating portion 711. In contrast, the first insulating portion 71 may be configured not to include the outer insulating portion 710 and the inner insulating portion 711 and not to be disassembled. For example, the first insulating portion 71 may be formed with a through hole 718 formed therein. The through hole 718 may be formed when the first insulating portion 71 is molded, or may be formed after the first insulating portion 71 is molded by cutting or the like.

[0106] In this case, the third insulating portion 73 is inserted into the through hole 718, whereby the connecting portion 733 is disposed in the through hole 718. At this time, either the first side surface insulator 731 or the second side surface insulator 732 may be inserted into the through hole 718. For example, the first wall portion 731Y and the second wall portion 731E may be configured to be foldable into a state in which they contact the side wall portion 731S, which makes it easy to insert the first side surface insulator 731 into the through hole 718. The first wall portion 732Y and the second wall portion 732E may also be configured to be foldable into a state in which they contact the side wall portion 732S.

[0107] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0108] 10... split stator, 22... magnet, 24... rotor core, 60... slot, 70... electrical insulator, 71... first insulating portion, 71BT... lower surface, 71, 71b, 71b2, 71c, 71d, 71e, 71i... first insulating portion, 72... second insulating portion, 73... third insulating portion, 80... stator core, 82... yoke, 84... teeth, 90... stator winding, 100... stator, 200... rotor, 300... compressor, 301... housing, 302... intake port, 303... motor chamber, 304... communicating passage, 305... discharge port, 310... motor, 3 20... compression mechanism, 322... fixed scroll, 324... movable scroll, 330... drive shaft, 332... eccentric pin, 340... power supply circuit, 710, 710b, 710b2, 710c, 710d... outer insulating portion, 710BT... outer opposing surface, 711, 711b2, 711c, 711d, 711e, 711j... inner insulating portion, 711U... inner opposing surface, 712... first outer wall portion, 712U... inner outer wall portion, 713... second side protrusion portion, 714... first body portion, 714U... inner body portion, 715, 715b, 715b2... protrusion portion, 7 16...first inner wall portion, 716U...inner inner wall portion, 717...first side protrusion portion, 718...through hole, 718R, 718R4...groove portion, 719, 719b2...opening portion, 722...second outer wall portion, 724...second body portion, 726...second inner wall portion, 731...first side insulator, 731E...second wall portion, 731S...side wall portion, 731Y...first wall portion, 732...second side insulator, 732E...second wall portion, 732S...side wall portion, 732Y...first wall portion, 733...connecting portion, 733CP...center, 733CT...center, 733Y1...end portion, 733Y2... End portion, 800, 800f, 800g, 800h, 800i...split core, 820...split yoke portion, 842...teeth base portion, 844...teeth tip portion, 844F1...first flange portion, 844F2...second flange portion, 844R...recess portion, 844W...tip surface, 860g...notch, 860, 860f, 860i, 860h...fitting hole, AS...assembly, ASR...recess portion, AX...rotating axis, CP...center, TS1...first side surface, TS2...second side surface, WE1...first outer peripheral surface, WE2...second outer peripheral surface, WY1...first inner peripheral surface, WY2...second inner peripheral surface

Claims

1. An electric motor including a stator having a cylindrical shape extending in an axial direction and a rotor, The stator includes: a split core including split yoke portions connected in an annular shape to form a yoke, and tooth base portions extending radially inward from the split yoke portions; an electrical insulator attached to the split core; a stator winding wound around the split core with the electrical insulator interposed therebetween, The electrical insulator is a first insulating portion disposed at an end portion of the divided core on a first side in the axial direction; a second insulating portion disposed at an end of the split core on a second axial side opposite to the first axial side; a third insulating portion configured to electrically insulate a side surface of the tooth base on a first circumferential side and a side surface of the tooth base on a second circumferential side opposite to the first circumferential side from the stator winding, The third insulating portion is a first side surface insulator disposed on a side surface of the tooth base on a first circumferential side; a second side surface insulator disposed on a side surface of the tooth base on a second circumferential side; a connecting portion connecting the first side surface insulator and the second side surface insulator, the first insulating portion has a through hole that penetrates the first insulating portion in a circumferential direction, The connecting portion is disposed in the through hole. Electric motor.

2. 2. The electric motor according to claim 1, The first insulating portion is an inner insulating portion disposed to cover an end portion of the split core on a first axial side; an outer insulating portion disposed on a first axial side of the inner insulating portion and having an outer facing surface facing the inner insulating portion, the inner insulating portion has an inner facing surface facing the outer insulating portion, The through hole is defined by the inner facing surface and the outer facing surface. Electric motor.

3. 3. The electric motor according to claim 2, At least one of the inner opposing surface and the outer opposing surface has a groove portion formed along a circumferential direction, The through hole is defined by the groove portion. Electric motor.

4. 3. The electric motor according to claim 2, the outer facing surface has a protrusion that protrudes toward the divided core, the inner facing surface has an opening through which the protrusion can be inserted, an end portion of the split core on a first axial side has a recess corresponding to the protrusion; Electric motor.

5. 3. The electric motor according to claim 2, The outer facing surface has an outer fitting portion having a convex or concave shape, The inner facing surface has an inner fitting portion having a convex or concave shape corresponding to the outer fitting portion. Electric motor.

6. 2. The electric motor according to claim 1, the split core has a tooth tip portion connected to a radially inner tip of the tooth base portion, The first insulating portion is an outer wall portion disposed at an end portion of the divided yoke portion on a first axial side; a body portion disposed at an end portion of the tooth base portion on a first axial side; an inner wall portion disposed at an end portion of the tooth tip portion on a first side in the axial direction, The through hole is disposed in the trunk portion of the first insulating portion. Electric motor.

7. 7. The electric motor according to claim 6, The inner wall portion is a first side protrusion disposed at an end of the inner wall portion on a first circumferential side, protruding toward a second axial side, and in contact with an end of the tooth tip portion on the first circumferential side; a second-side protrusion disposed at an end of the inner wall portion on a second circumferential side, protruding toward the second axial side, and in contact with an end of the tooth tip portion on the second circumferential side; Electric motor.

8. 2. The electric motor according to claim 1, the split core has a tooth tip portion connected to a radially inner tip of the tooth base portion, the tooth tip portion has a first flange portion extending from the tooth base portion toward a first circumferential side and a second flange portion extending from the tooth base portion toward a second circumferential side, The first side insulator is a first wall portion disposed opposite a first inner peripheral surface of the divided yoke portion extending from the tooth base toward a first side in the circumferential direction; a second wall portion disposed opposite to an outer peripheral surface of the first flange portion; a side wall portion disposed opposite a side surface of the tooth base on a first circumferential side, The second side insulator is a first wall portion disposed opposite a second inner peripheral surface of the divided yoke portion extending from the tooth base portion toward a second circumferential side; a second wall portion disposed opposite to an outer peripheral surface of the second flange portion; a side wall portion disposed opposite to a side surface of the tooth base on a second circumferential side, Electric motor.

9. 9. The electric motor according to claim 8, a radial center of the connecting portion is disposed either radially outer or radially inner than a radial center of the side wall portion of the first side surface insulator, or radially outer or radially inner than a radial center of the side wall portion of the second side surface insulator. Electric motor.

10. A compressor including a compression mechanism that compresses and discharges a fluid and an electric motor that drives the compression mechanism, The electric motor is the electric motor according to any one of claims 1 to 9. Compressor.

11. A method for manufacturing an electric motor including a stator having a cylindrical shape extending in an axial direction and a rotor, comprising: a preparation process for preparing an electrical insulator including: a first insulating portion including a through hole that penetrates the first insulating portion in a circumferential direction; a second insulating portion; and a third insulating portion configured to electrically insulate a stator winding from a side surface on a first circumferential side and a side surface on a second circumferential side of a tooth base that extends radially inward from a split yoke portion of a split core. an insertion step of inserting a portion of the third insulating portion into the through hole; an arrangement process of arranging the first insulating portion on a first axial side of the split core, the second insulating portion on a second axial side of the split core, and the third insulating portion on a side surface of the tooth base on the first circumferential side and a side surface of the tooth base on the second circumferential side; a winding step of winding the stator winding around the split cores with the electrical insulators disposed thereon. A method for manufacturing an electric motor.

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