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 connecting portion is disposed on the first axial side with respect to the tooth base portion while being in contact with the first insulating portion.SELECTED DRAWING: Figure 14

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 connecting portion is arranged on the first axial side of the tooth base in contact with the first insulating portion. According to this form of electric motor, by supporting the connecting portion with the first insulating portion, it is possible to suppress or prevent the first side insulator and the second side insulator from falling off from the split core when forming the stator. (2) In the electric motor of the above aspect, the first insulating portion may include a fitting portion that protrudes toward the split core. An end portion of the split core on a first axial side may have a fitted portion that corresponds to the fitting portion. According to this embodiment of the electric motor, the first insulating parts can be fixed to the split cores by simply fitting the fitting parts of the first insulating parts to the fitted parts of the split cores, which makes it possible to suppress or prevent the first insulating parts from falling off the split cores during the formation of the stator by a simple method. (3) In the electric motor of the above aspect, the first insulating portion may have a groove portion that has a concave shape extending from a radially inner side to a radially outer side of the first insulating portion or a concave shape extending from a radially outer side to a radially inner side of the first insulating portion and that circumferentially penetrates the first insulating portion. The connecting portion may be disposed in the groove portion while being inserted from a first circumferential side to a second circumferential side of the groove portion, and thereby be disposed on the first axial side of the tooth base while being in contact with the first insulating portion. According to this form of electric motor, the simple method of inserting the connecting portion into the groove can suppress or prevent the first side insulator and the second side insulator from falling off the split core when forming the stator. (4) In the electric motor of the above aspect, the split core may include tooth tip portions connected to radially inner tips of the tooth base portions. The first insulating portion may include 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 inner wall portion may include a first side protrusion arranged at an 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 portions on the first circumferential side, and a second side protrusion arranged at an 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 portions 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. (5) In the electric motor of the above aspect, the first insulating portion may include a fitting portion that protrudes toward the split core. An end portion of the split core on a first axial side may have a fitted portion that corresponds to the fitting portion. According to this embodiment of the electric motor, the first insulating parts can be fixed to the split cores by simply fitting the fitting parts of the first insulating parts to the fitted parts of the split cores, which makes it possible to suppress or prevent the first insulating parts from falling off the split cores during the formation of the stator by a simple method. (6) In the electric motor of the above aspect, the connecting portion may be arranged on an upper surface of the first insulating portion, and may be arranged on a first axial side relative to the tooth base while in contact with the first insulating portion. According to the electric motor of this aspect, the simple configuration can suppress or prevent the first side surface insulator and the second side surface insulator from falling off the split core when the stator is formed. (7) In the electric motor of the above form, the connecting portion may be arranged between the split core and the first insulating portion, and thereby be arranged on a first axial side relative to the tooth base while in contact with the first insulating portion. According to the electric motor of this aspect, the simple configuration can suppress or prevent the first side surface insulator and the second side surface insulator from falling off the split core when the stator is formed. (8) In the electric motor of the above aspect, the split core may include tooth tip portions connected to radially inner tips of the tooth bases. The tooth tip portions may include 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 include 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 include 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 external configuration of a third insulating part. [Figure 12] FIG. 4 is a plan view showing the configuration of the third insulating portion on the first axial side. [Figure 13] 5A to 5C are process diagrams showing the manufacturing process of the motor. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. 10 is an explanatory diagram showing the external configuration of a first insulating portion provided in a motor according to a second embodiment. [Figure 17] FIG. 4 is an explanatory diagram showing the configuration of a first side protrusion and a second side protrusion. [Figure 18] FIG. 10 is an explanatory diagram showing the external configuration of a split stator included in a motor according to a third embodiment. [Figure 19] FIG. 4 is an explanatory diagram showing the configuration of a third insulating part. [Figure 20] FIG. [Figure 21] FIG. 10 is an explanatory diagram showing the external configuration of a split stator included in a motor according to a fourth embodiment. [Figure 22] FIG. 4 is an explanatory diagram showing the configuration of a first insulating part. [Figure 23] FIG. 10 is an explanatory diagram showing the configuration of a fitting hole as a first modified example. [Figure 24] FIG. 10 is an explanatory diagram showing the configuration of a notch as a second modified example. [Figure 25] FIG. 10 is an explanatory diagram showing the configuration of a fitting hole as a third modified example. [Figure 26] 10A to 10C are process diagrams showing a modified example of the motor manufacturing process. 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 "fitted part." 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 12 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, for example, using 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 groove portion 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] 9 is an explanatory diagram showing the configuration of a side surface of the first insulating portion 71. The groove portion 718 has a concave shape extending from the radially inner side Y2 toward the radially outer side Y1 of the first insulating portion 71. More specifically, the groove portion 718 is formed linearly from the vicinity of the end portion of the first inner wall portion 716 on the second axial side Z2 toward the radially outer side Y1.

[0039] When the wall surface of the groove portion 718 that is disposed on the radially outer side Y1 and that extends along the circumferential direction DX is defined as a "bottom wall 718BT," the bottom wall 718BT is formed at a position corresponding to an end portion 733Y2 on the radially inner side Y2 of a connecting portion 733, which will be described later. In this embodiment, the bottom wall 718BT is disposed near the midpoint of the first body portion 714 in the radial direction DY.

[0040] When the surface of the first insulating portion 71 on the second axial side Z2 is defined as a "lower surface 71BT," the groove portion 718 is formed at a position that is 0.2 mm to 2.0 mm above the lower surface 71BT. In addition, in the circumferential direction DX, the groove portion 718 penetrates the first inner wall portion 716 and the first body portion 714 of the first insulating portion 71 along the circumferential direction DX. As a result, as will be described later, the connecting portion 733 can be inserted into the groove portion 718 from an end portion 718E on the radially inner side Y2 toward the radially outer side Y1.

[0041] Fig. 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 split core 800 on the second axial side Z2. The protruding portion 715 is an example of a "fitting portion."

[0042] The protrusion 715 is fitted into a fitting hole 860 formed on the first axial side Z1 of the split core 800. By simply fitting the protrusion 715 into the fitting hole 860, the first insulating portion 71 can be fixed to the fitting hole 860 when assembling the split core 800.

[0043] 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 triangular prism. By making the shape of the protrusion 715 a triangular prism, for example, when the protrusion 715 is fitted into the fitting hole 860, it is possible to prevent the first insulating portion 71 from rotating around the protrusion 715. It is also possible to improve the accuracy of aligning the first insulating portion 71 with respect to the fitting hole 860 when fixing the first insulating portion 71 to the split core 800.

[0044] 11 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. 11, the third insulating portion 73 includes a first side surface insulator 731, a second side surface insulator 732, and a connecting portion 733.

[0045] 11 , 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.

[0046] 12 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.

[0047] 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 to face the first inner circumferential surface WY1 and covers the entire first inner circumferential surface WY1.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] As shown in FIG. 12 , 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 or the position of the coupling portion 733 disposed in the groove portion 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 groove portion 718 is formed to have a shape and position corresponding to the shape and position of the coupling portion 733.

[0052] The connecting portion 733 is inserted into the groove 718 of the first insulating portion 71 shown in FIG. 8 . The connecting portion 733 inserted into the groove 718 is an example of a state in which the connecting portion 733 is in contact with the first insulating portion 71. The "state in which the connecting portion 733 is in contact with the first insulating portion 71" includes a state in which the connecting portion 733 is supported by the first insulating portion 71 to an extent that the connecting portion 733 does not fall off the first insulating portion 71, and a state in which the connecting portion 733 is fixed to the first insulating portion 71 to prevent the connecting portion 733 from falling off the first insulating portion 71. The connecting portion 733 inserted into the groove 718 is supported by the first insulating portion 71. 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 the split core 800.

[0053] FIG. 12 shows a center 733CP of the coupling portion 733, an end 733Y1 of the coupling portion 733 on the radially outer side Y1, and an end 733Y2 of the coupling portion 733 on the radially inner side Y2. In this embodiment, the "center 733CP of the coupling portion 733" refers to the center of the outline of the coupling portion 733 when viewed from above. 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. In this embodiment, when the coupling portion 733 is inserted into the groove portion 718, the end 733Y1 is positioned so as to contact the bottom wall 718BT of the groove portion 718. This configuration facilitates positioning of the coupling portion 733 in the groove portion 718 when inserting the coupling portion 733 into the groove portion 718. On the condition that the connecting portion 733 can be inserted into the groove portion 718, the end portion 733Y1 and the bottom wall 718BT may be configured not to come into contact with each other.

[0054] 12 , 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.

[0055] 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 orientation of the third insulating portion 73 is erroneously reversed along the radial direction DY, that is, even if the end portion 733Y1 and the end portion 733Y2 are arranged in opposite directions, the connecting portion 733 may be inserted into the groove portion 718. In this case, the third insulating portion 73 may be arranged in the split core 800 while still facing in the opposite direction. In this case, the end portion 733Y2 contacts the bottom wall 718BT of the groove portion 718 instead of the end portion 733Y1.

[0056] 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 is inserted into the groove 718, the end 733Y2 of the connecting portion 733 is obstructed by the bottom wall 718BT of the groove 718. As a result, the third insulating portion 73 cannot be attached to the first insulating portion 71 in the reversed state, and the first insulating portion 71 and the third insulating portion 73 cannot be attached to the split core 800. Therefore, for example, an operational error such as arranging 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.

[0057] A5. Manufacturing method of motor 310: A method for manufacturing the motor 310 of this embodiment will be described with reference to Figures 13 to 15. Figure 13 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.

[0058] The split stator forming process S100 and the connecting process S200 are manufacturing processes for the stator 100. In the split stator forming process S100, the split stator 10 shown in Figure 4 is formed. The split stator forming process S100 includes a preparation process S10, an insertion process S20, an arrangement process S30, and a winding process S40. In the preparation process 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.

[0059] Fig. 14 is an explanatory diagram showing an overview of the insertion step S20. As shown in Fig. 14, in the insertion step S20, an assembly AS is formed by inserting the connecting portion 733 of the third insulating part 73 into the groove portion 718 of the first insulating part 71. In the assembly AS, a recess ASR is formed between the first side surface insulator 731 and the second side surface insulator 732, and is defined by the side wall portion 731S, the side wall portion 732S, and the lower surface 71BT.

[0060] 13, 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. 14 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. 14. 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.

[0061] 15 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.

[0062] 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. 15 , 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.

[0063] 13, 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, etc. 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.

[0064] A6.Effects: As described above, in the motor 310 of this embodiment, the third insulating portion 73 includes the connecting portion 733 that connects the first side surface insulator 731 and the second side surface insulator 732. The connecting portion 733 is disposed on the first axial side Z1 with respect to the tooth base 842 while contacting the first insulating portion 71. By supporting the connecting portion 733 with the first insulating portion 71, it is possible to suppress or prevent the first side surface insulator 731 and the second side surface insulator 732 from falling off the first insulating portion 71. 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 split core 800 when the stator winding 90 is wound around the third insulating portion 73.

[0065] According to the motor 310 of this embodiment, the first insulating portion 71 includes a groove 718 having a concave shape extending from the radially inner side Y2 to the radially outer side Y1 of the first insulating portion 71. The groove 718 penetrates the first insulating portion 71 in the circumferential direction DX. The connecting portion 733 is disposed in the groove 718, inserted through the groove 718 from the first circumferential side X1 to the second circumferential side X2. The connecting portion 733 can be supported by the first insulating portion 71 by the simple method of inserting the connecting portion 733 into the groove 718. Supporting the connecting portion 733 in the groove 718 suppresses or prevents the first side surface insulator 731 and the second side surface insulator 732 of the third insulating portion 73 from falling off the split core 800 when the stator winding 90 is wound thereon.

[0066] According to the motor 310 of this embodiment, a protrusion 715 that protrudes toward the split core 800 is formed on the lower surface 71BT of the first insulating part 71. A fitting hole 860 having a shape corresponding to the protrusion 715 is formed on the surface of the split core 800 on the first axial side Z1. By the simple method of fitting the protrusion 715 into the fitting hole 860, the first insulating part 71 can be fixed to the split core 800 when assembling the split core 800. Therefore, this simple method can suppress or prevent the first insulating part 71 from falling off the split core 800 when the stator winding 90 is wound around it.

[0067] 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.

[0068] B. Second embodiment: 16 is an explanatory diagram showing the external configuration of a first insulating portion 71b provided in a split stator 10 of a motor 310 of the second embodiment. The first insulating portion 71b differs from the first insulating portion 71 shown in the first embodiment in that it has a first outer wall portion 712b instead of the first outer wall portion 712, a first inner wall portion 716b instead of the first inner wall portion 716, and a groove portion 718b instead of the groove portion 718; otherwise, the configuration is the same as that of the first insulating portion 71.

[0069] The groove 718b is formed in a different direction from the groove 718 shown in the first embodiment. Specifically, the groove 718b is formed linearly from the vicinity of the end of the first outer wall portion 712b on the second axial side Z2 toward the radially inner side Y2 to a position approximately in the middle of the first body portion 714. That is, in this embodiment, the groove 718b has a concave shape extending from the radially outer side Y1 toward the radially inner side Y2 of the first insulating portion 71b. Therefore, the direction in which the connecting portion 733 is inserted into the groove 718b is the radially inner side Y2, which is the opposite direction from the first embodiment. Note that in this embodiment, the end 733Y2 of the connecting portion 733 contacts the bottom wall 718BT of the groove 718b.

[0070] An end 718E2 of the groove 718b is formed on the second axial side Z2 of the first outer wall portion 712b. Therefore, the length of the first outer wall portion 712b along the axial direction DZ is shorter than that of the first outer wall portion 712 shown in the first embodiment. Other configurations of the first outer wall portion 712b are similar to those of the first outer wall portion 712.

[0071] The first inner wall portion 716b differs from the first inner wall portion 716 shown in the first embodiment in that it includes a first side protrusion 717 and a second side protrusion 719. The width of the first inner wall portion 716b along the circumferential direction DX is configured to be wider than that of the first inner wall portion 716 by a length corresponding to the first side protrusion 717 and the second side protrusion 719. Specifically, in the first embodiment, as shown in FIG. 15 , the example in which the first inner wall portion 716 has substantially the same width as the width of the tooth tip portion 844 along the circumferential direction DX, but in this embodiment, the first inner wall portion 716b is configured to be wider than the width of the tooth tip portion 844 along the circumferential direction DX (width W6, described later). An end face of the first inner wall portion 716b on the second axial side Z2 is part of the lower surface 71BT.

[0072] The first side protrusion 717 and the second side protrusion 719 are columnar structures that protrude from the end of the first inner wall portion 716b 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 at the lower end of the first inner wall portion 716b on the first circumferential side X1, and the second side protrusion 719 is provided at the lower end of the first inner wall portion 716b on the second circumferential side X2.

[0073] Fig. 17 is an explanatory diagram showing the configuration of the first side protrusion 717 and the second side protrusion 719. As shown in Fig. 17, the first side protrusion 717 and the second side protrusion 719, together with the lower surface 71BT, define a recess 844R.

[0074] A distance W5 from the first side protrusion 717 to the second side protrusion 719 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 71b is assembled to the split core 800, the first side protrusion 717 and the second side protrusion 719 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 71b 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.

[0075] According to the motor 310 of this embodiment, the groove 718b has a concave shape extending from the radially outer side Y1 toward the radially inner side Y2 of the first insulating portion 71b. This provides the same effects as the first embodiment, and also makes it easy to form structures such as the first side protrusion 717 and the second side protrusion 719 on the second axial side Z2 of the first inner wall portion 716b disposed on the radially inner side Y2.

[0076] According to the motor 310 of this embodiment, the first insulating portion 71b includes a first side protrusion 717 and a second side protrusion 719 that protrude from an end of the first inner wall portion 716b 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 first inner wall portion 716b on the first circumferential side X1, and the second side protrusion 719 is provided at a lower end of the first inner wall portion 716b on the second circumferential side X2. The first side protrusion 717 and the second side protrusion 719, together with the lower surface 71BT, define recesses 844R. Therefore, the first insulating portion 71b can be fixed to the split core 800 by the simple method of 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 71b around the axial direction DZ relative to the split core 800 can be suppressed or prevented.

[0077] In this embodiment, the first insulating portion 71b does not include the protrusion 715. However, the first insulating portion 71b may include the protrusion 715. In this embodiment, even if the first insulating portion 71b includes the cylindrical protrusion 715, for example, the first insulating portion 71b includes the first side protrusion 717 and the second side protrusion 719, thereby suppressing or preventing rotation of the first insulating portion 71b relative to the split core 800.

[0078] C. Third embodiment: 18 is an explanatory diagram showing the external configuration of a split stator 10c included in a motor 310 of the third embodiment. Split stator 10c differs from split stator 10 shown in the first embodiment in that it includes an electrical insulator 70c instead of electrical insulator 70, but otherwise has the same configuration as split stator 10. Electrical insulator 70c differs in that it includes a first insulating portion 71c instead of first insulating portion 71 and a third insulating portion 73c instead of third insulating portion 73.

[0079] The first insulating portion 71c differs from the first insulating portion 71 in that it does not include the groove portion 718. The first insulating portion 71c has substantially the same configuration as the second insulating portion 72 described above.

[0080] 19 is an explanatory diagram showing the configuration of the third insulating portion 73c. ​​The third insulating portion 73c differs from the third insulating portion 73 shown in the first embodiment in that it includes a connecting portion 733c instead of the connecting portion 733. The width of the connecting portion 733c in the circumferential direction DX is longer than the width of the connecting portion 733. Therefore, while the width W4 shown in FIG. 12 is formed between the first side surface insulator 731 and the second side surface insulator 732, the connecting portion 733c is configured to be curved toward the first axial side Z1 as shown in FIG.

[0081] Fig. 20 is an explanatory diagram showing the configuration of the assembly AS3. As shown in Fig. 20, the assembly AS3 is formed by using gravity to place the curved connecting portion 733c on the surface of the first body portion 714 on the first axial side Z1. The connecting portion 733c placed on the surface of the first body portion 714 on the first axial side Z1 is an example of a state in which the connecting portion 733c is in contact with the first insulating portion 71. The assembly AS3 and the second insulating portion 72 are attached to the split core 800, and the stator winding 90 is wound around the split core 800 to form the split stator 10c.

[0082] As in the motor 310 of this embodiment, the split stator 10c may be placed on the surface of the first axial side Z1 of the first body portion 714 during formation, so that the split stator 10c is disposed on the first axial side Z1 relative to the tooth base 842 in contact with the first insulating portion 71c. In this case, for example, by forming the split stator 10c with the first axial side Z1 facing vertically upward, the connecting portion 733c is supported by the first outer wall portion 712 and the first inner wall portion 716 by utilizing gravity. Therefore, with a simple configuration, it is possible to suppress or prevent the connecting portion 733c from falling off the first insulating portion 71c.

[0083] D. Fourth embodiment: 21 is an explanatory diagram showing the external configuration of a split stator 10d included in a motor 310 of the fourth embodiment. Split stator 10d differs from split stator 10 shown in the first embodiment in that it includes an electrical insulator 70d instead of electrical insulator 70, but otherwise has the same configuration as split stator 10. Electrical insulator 70d differs in that it includes a first insulating portion 71d instead of first insulating portion 71.

[0084] 22 is an explanatory diagram showing the configuration of the first insulating portion 71d. The first insulating portion 71d differs from the first insulating portion 71 in that it has a recess 718R instead of the groove 718. The recess 718R is formed on the lower surface 71BT of the first insulating portion 71d and penetrates the first insulating portion 71d in the circumferential direction DX. The recess 718R has a recessed shape corresponding to the connecting portion 733 and can accommodate the connecting portion 733.

[0085] An assembly is formed by placing the connecting portion 733 in the recess 718R of the first insulating portion 71d, and the formed assembly is attached to the split core 800. That is, in the split stator 10d, the connecting portion 733 is sandwiched between the end face on the first axial side Z1 of the split core 800 and the recess 718R of the first insulating portion 71d. The connecting portion 733 placed in the recess 718R is an example of a "state in contact with the first insulating portion 71d."

[0086] As described above, in this embodiment, the connecting portion 733 is accommodated in the recess 718R, and is thereby disposed between the split core 800 and the first insulating portion 71d. By simply sandwiching the connecting portion 733 between the first insulating portion 71d and the split core 800, the third insulating portion 73 can be supported by the first insulating portion 71d and the split core 800. Therefore, this simple method can 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 split core 800 when the stator winding 90 is wound thereon.

[0087] The recess 718R may be formed in the end surface of the split core 800 on the first axial side Z1 instead of or together with the first insulating portion 71d. The split stator 10d may not include the recess 718R. In this case, the connecting portion 733 may be sandwiched between the split core 800 and the lower surface 71BT of the first insulating portion 71 configured similarly to the second insulating portion 72, for example.

[0088] E. Other Embodiments: (E1) In the first embodiment described above, an example was shown in which the protrusion 715 having a substantially triangular 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 triangular prism, as exemplified below.

[0089] Fig. 23 is an explanatory diagram showing the configuration of a fitting hole 860e as a first modified example. As in the split core 800e shown in Fig. 23, a fitting hole 860e having a so-called oval shape may be provided. Examples of oval shapes include the rounded rectangle shown in Fig. 23, an egg shape, an ellipse, and the like. 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.

[0090] FIG. 24 is an explanatory diagram showing the configuration of a notch 860f as a second modified example. As in the split core 800f shown in FIG. 24, a notch 860f may be provided that connects the surface on the first axial side Z1 and the surface on the radially outer side Y1. The notch 860f 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 860f may be formed at both ends of the split core 800f in the axial direction DZ.

[0091] FIG. 25 is an explanatory diagram showing the configuration of a fitting hole 860g as a third modified example. As with the split core 800g shown in FIG. 25, multiple fitting holes 860g may be provided. Each fitting hole 860g has a substantially cylindrical shape. In the example of FIG. 25, two fitting holes 860g are arranged along the radial direction DY. Even with this configuration, as with the first embodiment, when fixing the first insulating part 71 to the split core 800g, it is possible to prevent the first insulating part 71 from rotating around the protruding part 715. The fitting hole 860e, the notch 860f, and the fitting hole 860g are examples of "fitted part."

[0092] (E2) Figure 26 is a process diagram showing a modified example of the manufacturing process of the motor 310. In the manufacturing method of the electric motor according to the first embodiment, an example has been described in which the arranging process S30 is performed after the inserting process S20. However, as will be described later, the inserting process S32 may be configured to be performed during the arranging process S30h. In other words, the inserting process S32 and the arranging process S30h may be configured as a single process.

[0093] In the first embodiment, in the insertion step S20, the assembly AS is formed by inserting the connecting portion 733 of the third insulating portion 73 into the groove portion 718 of the first insulating portion 71. In the arrangement step S30, 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. 26 , in the arrangement step S30h, the first insulating portion 71 and the second insulating portion 72 are first attached to the split core 800.

[0094] Next, in an insertion step S32, the connecting portion 733 of the third insulating portion 73 is inserted into the groove portion 718 of the first insulating portion 71 attached to the split core 800. With the connecting portion 733 inserted into the groove portion 718, the first side surface insulator 731 and the second side surface insulator 732 of the third insulating portion 73 are arranged on the split core 800 by a method such as bending. Specifically, 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 portion 842.

[0095] As described above, the order of the arranging step and the inserting step may be changed arbitrarily. Even in such a configuration, the same effects as those of the first embodiment can be achieved.

[0096] 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]

[0097] 10, 10c, 10d... split stator, 22... magnet, 24... rotor core, 60... slot, 70, 70c, 70d... electrical insulator, 71, 71b, 71c, 71d... first insulating portion, 71BT... lower surface, 72... second insulating portion, 73, 73c... 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...communication passage, 305...discharge port, 310...motor, 320...compression mechanism, 322...fixed scroll, 324...moving scroll, 330...drive shaft, 332...eccentric pin, 340...power supply circuit, 712, 712b...first outer wall portion, 714...first body portion, 715...projection portion, 716, 716b...first inner wall portion, 717...first side projection portion, 718, 718b...groove portion, 718BT...bottom wall, 718E...end portion, 718R...recessed portion, 719... Second side protrusion, 722...second outer wall, 724...second body, 726...second inner wall, 731...first side insulator, 731E...second wall, 731S...side wall, 731Y...first wall, 732...second side insulator, 732E...second wall, 732S...side wall, 732Y...first wall, 733, 733c...connecting portion, 733CP...center, 733Y1, 733Y2...end, 800, 800e, 800f, 800g...split core, 820...split yoke portion, 842...teeth base portion, 844...teeth tip portion, 844F1...first flange portion, 844F2...second flange portion, 844R...recessed portion, 844W...tip surface, 860, 860e, 860g...fitting hole, 860f...notch, 718E2...end portion, AS, AS3...assembly, ASR...recessed 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 connecting portion is disposed on a first axial side with respect to the tooth base portion in a state of contact with the first insulating portion; Electric motor.

2. 2. The electric motor according to claim 1, the first insulating portion includes a fitting portion that protrudes toward the split core, an end portion of the split core on a first axial side has a fitted portion corresponding to the fitting portion; Electric motor.

3. 2. The electric motor according to claim 1, the first insulating portion has a groove portion that has a concave shape extending from a radially inner side to a radially outer side of the first insulating portion or a concave shape extending from a radially outer side to a radially inner side of the first insulating portion, and that penetrates the first insulating portion in a circumferential direction, The connecting portion is disposed in the groove portion in a state where it is inserted from a first circumferential side to a second circumferential side of the groove portion, and is thereby disposed on the first axial side with respect to the tooth base portion in a state where it is in contact with the first insulating portion. Electric motor.

4. 4. The electric motor according to claim 3, the split core includes 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 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.

5. 5. The electric motor according to claim 4, the first insulating portion includes a fitting portion that protrudes toward the split core, an end portion of the split core on a first axial side has a fitted portion corresponding to the fitting portion; Electric motor.

6. The electric motor according to claim 1 , wherein the connecting portion is disposed on an upper surface of the first insulating portion, and is disposed on a first axial side of the tooth base in contact with the first insulating portion.

7. The electric motor according to claim 1 , wherein the connecting portion is arranged between the split core and the first insulating portion, and is thereby arranged on a first axial side relative to the tooth base while in contact with the first insulating portion.

8. 2. The electric motor according to claim 1, the split core includes a tooth tip portion connected to a radially inner tip of the tooth base portion, the tooth tip portion includes 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 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 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 groove portion 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 inserting step of inserting a portion of the third insulating portion into the groove; 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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