Stator and motor

Abstract

To provide a stator capable of improving dissipation of heat generated from a winding.SOLUTION: A stator includes: a stator core including an annular core back 111 around a center shaft extending vertically, and teeth 112 extending radially from the core back; an insulator arranged at least at the teeth; a winding 14 arranged around the insulator; and an interposing member 15 disposed at least between the insulator and the teeth. When weight of the interposing member disposed in a gap between the insulator and the stator core is W1 and weight of the interposing member disposed outside the gap is W2, W1≥W2×0.1 is satisfied.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a stator and a motor. [Background technology]

[0002] BACKGROUND ART Conventionally, in a motor including a stator having teeth and a rotor, it is known to provide an insulator, which is an insulating member attached to and covering the teeth (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-145419 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-166977 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, due to factors such as the ease of mounting the insulator, there is a gap between the teeth and the insulator, and this gap serves as an air gap. When a current flows through the winding wound around the insulator and the winding generates heat, the heat generated from the winding is conducted to the teeth via the insulator and the air gap, so there is room for improvement in heat dissipation performance. In addition, in Patent Document 2, the entire stator is covered with resin, which may increase costs.

[0005] In view of the above circumstances, an object of the present disclosure is to provide a stator that can improve the heat dissipation performance of heat generated from windings. [Means for solving the problem]

[0006] An exemplary stator of the present disclosure has a stator core including an annular core back centered on a central axis extending vertically and teeth extending radially from the core back, insulators arranged at least on the teeth, windings arranged around the insulators, and intervening members arranged at least between the insulators and the teeth, where W1 is the weight of the intervening members arranged in the gap between the insulator and the stator core, and W2 is the weight of the intervening members arranged outside the gap, and W1 ≧ W2 × 0.1 is satisfied. [Effects of the Invention]

[0007] According to the exemplary stator of the present disclosure, it is possible to improve the performance of dissipating heat generated from the windings. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an electric motorcycle according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a vertical cross-sectional view of the motor. [Figure 3] FIG. 3 is a cross-sectional top view of the motor. [Figure 4] FIG. 4 is a perspective view of the first insulator and the second insulator. [Figure 5] FIG. 5 is an enlarged plan cross-sectional view of a main part of the stator. [Figure 6] FIG. 6 is a perspective view showing the first insulator to which the interposition member is fixed. [Figure 7] FIG. 7 is an enlarged plan cross-sectional view of a main part of the stator (before the expansion of the intervening member). [Figure 8] FIG. 8 is an enlarged plan cross-sectional view of a main part of the stator (after the expansion of the intervening member). DETAILED DESCRIPTION OF THE INVENTION

[0009] An exemplary embodiment of the present disclosure will be described below with reference to the drawings. Note that, in this specification, when describing an electric motorcycle 200 having a motor 100 according to an embodiment of the present disclosure, the terms "front" and "back" are used relative to the rider operating the electric motorcycle 200. Furthermore, when describing the motor and stator, the direction in which the central axis J of the motor 100 extends will be referred to as the "vertical direction," and in the drawings, the upper side will be indicated as Z1 and the lower side will be indicated as Z2. Furthermore, the radial direction and circumferential direction about the central axis J will simply be referred to as the "radial direction" and the "circumferential direction." In the drawings, one side of the circumferential direction will be indicated as θ1, and the other side of the circumferential direction will be indicated as θ2. Note that the directions defined above do not limit the orientation when the motor 100 is mounted on equipment.

[0010] <1. Electric motorcycle> 1 is a schematic diagram showing the configuration of an electric motorcycle 200 according to an embodiment of the present disclosure. The electric motorcycle 200 has a motorcycle body 201 having a seat 201a on which a rider sits. A front wheel 202 is disposed in front of the motorcycle body 201. A rear wheel 203 is disposed behind the motorcycle body 201. The motorcycle body 201 is provided so as to be movable relative to the ground using the front wheel 202 and the rear wheel 203.

[0011] A rider sitting on the seat 201a grips handlebars 204 located in front to control the direction of travel of the electric motorcycle 200. The rear of the motorcycle body 201 has a motor 100 (described below) and a speed reducer, both of which are not shown in FIG. 1. The driving force generated by the motor 100 is transmitted to the rear wheel 203 via the speed reducer. A throttle (not shown) is provided on the handlebars 204. In the electric motorcycle 200, the drive of the motor 100 is controlled in response to the rider's operation of the throttle.

[0012] In this embodiment, the motor 100 is configured to drive the rear wheel 203, but the motor 100 may also be configured to drive the front wheel 202. The motor of the present disclosure is not limited to electric motorcycles and may be applied to other mobile objects. Mobile objects may include, for example, automobiles, motorcycles, ships, and aircraft. The motor of the present disclosure is not limited to mobile objects and may be applied to home appliances.

[0013] <2. Motor> Fig. 2 is a longitudinal cross-sectional view of the motor 100. Fig. 2 is a cross-sectional view taken along a plane including the central axis J. As shown in Fig. 2, the motor 100 has a stator 1, a rotor 2, a shaft 3, a first bearing 4, a second bearing 5, an oil seal 6, a housing 7, a holder 8, and a cover 9.

[0014] The housing 7 is cylindrical with a bottom and extends vertically about a central axis J. The housing 7 has a bottom 71 at its upper part. The bottom 71 has a through-hole that penetrates vertically at its radial center. A bearing holder 71A that protrudes downward is provided at the radial center of the bottom 71. The bearing holder 71A is formed by arranging two cylinders vertically, each extending vertically about the central axis J. The inner diameter of the lower cylinder is larger than the inner diameter of the upper cylinder. The first bearing 4, which will be described later, is housed in the lower cylinder.

[0015] The stator 1 has an annular shape centered on a central axis J. The radially outer peripheral surface of the stator 1 is fixed to an inner wall surface 7A of the housing 7. More specifically, the radially outer peripheral surface of a stator core 11 included in the stator 1 is fixed to the inner wall surface 7A of the housing 7. Details of the stator 1 will be described later.

[0016] The rotor 2 has a rotor core 21, a magnet 22, a first plate 23, and a second plate 24, and is disposed radially inward of the stator core 11. The rotor core 21 is formed by stacking electromagnetic steel sheets in the vertical direction. The magnets 22 are flat plates extending in the vertical direction, and are housed inside the rotor core 21 with multiple magnets disposed in the circumferential direction (see FIG. 3, described later). The first plate 23 is fixed to the upper surface of the rotor core 21. The second plate 24 is fixed to the lower surface of the rotor core 21. The first plate 23 and the second plate 24 are formed from metal, resin, or the like.

[0017] The shaft 3 is columnar and extends in the vertical direction, and is fixed to the rotor 2 while passing through the first plate 23, the rotor core 21, and the second plate 24 in the vertical direction.

[0018] The first bearing portion 4 is a ball bearing and is held by the bearing holding portion 71A. The holder 8 is fixed to the lower end of the housing 7. The holder 8 has a bearing holding portion 81 at its upper end. The bearing holding portion 81 is cylindrical and extends in the vertical direction around the central axis J. The second bearing portion 5 is a ball bearing and is held by the bearing holding portion 81. The shaft 3 is supported by the first bearing portion 4 and the second bearing portion 5 so as to be rotatable about the central axis J. The oil seal 6 is annular and centered on the central axis J, and is disposed between the shaft 3 and the bearing holding portion 71A. The oil seal 6 is disposed above the first bearing portion 4. The cover 9 is disc-shaped and centered on the central axis J, and is fixed to the underside of the holder 8.

[0019] The rotor 2 rotates about the central axis J due to a circumferential torque generated by supplying a driving current to the stator 1. The shaft 3 rotates together with the rotor 2 and transmits the driving force to a reducer (not shown).

[0020] The motor 100 of this embodiment is a so-called inner rotor motor, in which the rotor 2 is disposed radially inward of the stator 1. However, the technology of the present disclosure is not limited to inner rotor motors, but can also be applied to so-called outer rotor motors, in which the rotor is disposed radially outward of the stator. In other words, the motor of the present disclosure has a stator and a rotor that faces the stator in the radial direction.

[0021] 3. Stator The stator 1 has an insulator 10, a stator core 11, and a winding 14. Here, Fig. 3 is a top cross-sectional view of the motor 100. Fig. 3 is a cross-sectional view seen from above when cut along a plane perpendicular to the central axis J.

[0022] The stator core 11 has a core back 111 and teeth 112. The core back 111 is annular and centered on a central axis J. The teeth 112 protrude radially inward from the radially inner circumferential surface of the core back 111. A plurality of teeth 112 are arranged in the circumferential direction. That is, the stator 1 has a stator core 11 including the annular core back 111 centered on the central axis J extending vertically, and the teeth 112 extending radially from the core back 111.

[0023] More specifically, the tooth 112 has an extension portion 112A and an umbrella portion 112B. The extension portion 112A extends radially inward from the radially inner circumferential surface of the core back 111. The umbrella portion 112B extends from the radially inner end of the extension portion 112A to both circumferential sides. The umbrella portion 112B is formed symmetrically in the circumferential direction with respect to the center line of the extension portion 112A, which is perpendicular to the central axis J. The umbrella portion 112B has a protruding portion T1 that protrudes toward one circumferential side from the extension portion 112A, and a protruding portion T2 that protrudes toward the other circumferential side from the extension portion 112A.

[0024] The insulator 10 has a first insulator 12 and a second insulator 13 that face each other in the vertical direction. The first insulator 12 is arranged higher than the second insulator 13. The first insulator 12 is attached to the teeth 112 and covers the upper parts of the teeth 112 and the upper parts of the core back 111. The second insulator 13 is attached to the teeth 112 below the first insulator 12 and covers the lower parts of the teeth 112 and the lower parts of the core back 111. In other words, the stator 1 has at least the insulators 10 that are arranged on the teeth 112. The first insulator 12 and the second insulator 13 are made of an insulating material such as resin. The first insulator 12 and the second insulator 13 are provided for each of the plurality of teeth 112.

[0025] Fig. 4 is a perspective view of the first insulator 12 and the second insulator 13 (i.e., the insulator 10). Fig. 4 is a view showing a state in which the first insulator 12 and the second insulator 13 are attached to the teeth 112 (not shown in Fig. 4).

[0026] The first insulator 12 has a top cover portion 121, a first side cover portion 122, a second side cover portion 123, a first protruding cover portion 124, a second protruding cover portion 125, a first core back cover portion 126, and a second core back cover portion 127.

[0027] The top surface cover portion 121 covers the top surface of the extension portion 112A from above. The first side surface cover portion 122 covers one circumferential side surface of the extension portion 112A from one circumferential side. The second side surface cover portion 123 covers the other circumferential side surface of the extension portion 112A from the other circumferential side. The first overhang cover portion 124 covers the radial outer surface of the overhang portion T1 from the radially outer side. The second overhang cover portion 125 covers the radial outer surface of the overhang portion T2 from the radially outer side. The first core back cover portion 126 covers the radial inner circumferential surface of the core back 111 from the radially inner side on one circumferential side of the extension portion 112A. The second core back cover portion 127 covers the radial inner circumferential surface of the core back 111 from the radially inner side on the other circumferential side of the extension portion 112A.

[0028] That is, the first insulator 12 has a first side surface cover portion 122 that covers one circumferential side surface of the tooth 112, and a second side surface cover portion 123 that covers the other circumferential side surface of the tooth 112.

[0029] The second insulator 13 has a bottom cover portion 131, a third side cover portion 132, a fourth side cover portion 133, a third protruding cover portion 134, a fourth protruding cover portion 135, a third core back cover portion 136, and a fourth core back cover portion 137.

[0030] The lower surface cover portion 131 covers the lower surface of the extension portion 112A from below. The third side surface cover portion 132 covers one circumferential side surface of the extension portion 112A from one circumferential side. The fourth side surface cover portion 133 covers the other circumferential side surface of the extension portion 112A from the other circumferential side. The third overhang cover portion 134 covers the radial outer surface of the overhang portion T1 from the radially outer side. The fourth overhang cover portion 135 covers the radial outer surface of the overhang portion T2 from the radially outer side. The third core back cover portion 136 covers the radial inner circumferential surface of the core back 111 from the radially inner side on one circumferential side of the extension portion 112A. The fourth core back cover portion 137 covers the radial inner circumferential surface of the core back 111 from the radially inner side on the other circumferential side of the extension portion 112A.

[0031] That is, the second insulator 13 has a third side surface cover portion 132 that covers one circumferential side surface of the tooth 112, and a fourth side surface cover portion 133 that covers the other circumferential side surface of the tooth 112.

[0032] The windings 14 (see FIG. 3 ) are formed by winding a conductive wire around the outside of the first insulator 12 and the second insulator 13 attached to the teeth 112. Specifically, the windings 14 are arranged around the top cover portion 121, the first side cover portion 122, the third side cover portion 132, the bottom cover portion 131, the fourth side cover portion 133, and the second side cover portion 123. The windings 14 are formed by concentrated winding. That is, the stator 1 has the windings 14 arranged around the insulators 10. The first insulator 12 and the second insulator 13 ensure insulation between the stator core 11 and the windings 14.

[0033] <4.Intervening member> In the stator 1 of the present disclosure, intervening members are disposed in the gaps between the stator core 11 and the insulators 12 and 13. The intervening members will be described in detail below. Note that the intervening members do not include gases such as air.

[0034] <4-1. First embodiment> Here, an embodiment will be described in which thermal grease is used as the interposing member. Fig. 5 is an enlarged top cross-sectional view of a main part of one tooth 112 of the stator 1. Fig. 5 corresponds to a partially enlarged view of Fig. 3.

[0035] In the manufacturing process of the stator 1, for example, the intervening member 15, which is a thermal grease, is applied in advance to the upper surface of the extension portion 112A. Then, the first insulator 12 is placed over the teeth 112 from above. At this time, when the first insulator 12 is pressed downward, a portion of the applied intervening member 15 flows into the gap between one circumferential side surface of the extension portion 112A and the first side surface cover portion 122 of the first insulator 12, and a first portion 151 of the intervening member 15 is disposed in the gap. Furthermore, a portion of the applied intervening member 15 flows into the gap between the other circumferential side surface of the extension portion 112A and the second side surface cover portion 123 of the first insulator 12, and a second portion 152 of the intervening member 15 is disposed in the gap.

[0036] Furthermore, a portion of the applied intervening member 15 flows into the gap between the radial inner circumferential surface of the core back 111 and the first core back cover portion 126 of the first insulator 12, whereby a third portion 153 of the intervening member 15 is disposed in the gap. Furthermore, a portion of the applied intervening member 15 flows into the gap between the radial inner circumferential surface of the core back 111 and the second core back cover portion 127 of the first insulator 12, whereby a fourth portion 154 of the intervening member 15 is disposed in the gap.

[0037] Furthermore, a portion of the applied intervening member 15 flows into the gap between the radial outer surface of the protruding portion T1 and the first protruding cover portion 124 of the first insulator 12, whereby a fifth portion 155 of the intervening member 15 is disposed in the gap. A portion of the applied intervening member 15 flows into the gap between the radial outer surface of the protruding portion T2 and the second protruding cover portion 125 of the first insulator 12, whereby a sixth portion 156 of the intervening member 15 is disposed in the gap.

[0038] It should be noted that a portion of the applied intervening member 15 remains on the upper surface of the extending portion 112 A. Furthermore, the third to sixth portions of the intervening member 15 do not necessarily have to be disposed.

[0039] Furthermore, when attaching the second insulator 13 to the tooth 112, for example, the intervening member 15 can be applied in advance to the underside of the extension portion 112A, and the second insulator 13 can be placed over the tooth 112 from below, thereby positioning the intervening member 15 between the second insulator 13 and the stator core 11 in the same manner as in the case of the first insulator 12.

[0040] As described above, the stator 1 of the present disclosure has at least the intervening member 15 disposed between the insulator 10 and the teeth 112. As a result, heat generated in the windings 14 when a drive current flows through the windings 14 is conducted to the teeth 112 via the insulator 10 and the intervening member 15, thereby improving heat dissipation performance compared to when an air gap is disposed between the insulator 10 and the teeth 112. This in turn improves the performance of the motor 100.

[0041] Furthermore, when the first insulator 12 and the second insulator 13 are attached to the teeth 112, the applied intervening member 15 may leak out from the gap S1 (FIG. 4) between the first side cover portion 122 and the third side cover portion 132, or the gap S2 (FIG. 4) between the second side cover portion 123 and the fourth side cover portion 133. Even in such cases, the main portion of the intervening member 15 is disposed in the gap between the insulator 10 and the stator core 11.

[0042] More specifically, if the weight of the interposed member 15 disposed in the gap between the insulator 10 and the stator core 11 is W1 and the weight of the interposed member 15 disposed outside the gap is W2, then: W1 ≥ W2 × 0.1.

[0043] The above conditional expression is also satisfied when the interposition member 15 is not disposed outside the gap (W2=0).

[0044] In this embodiment, the interposing member 15 is heat dissipation grease, which can improve heat dissipation performance while reducing costs compared to using an adhesive as the interposing member 15 as in the second embodiment described later.

[0045] Furthermore, the intervening members 15 are disposed at least between one circumferential side surface of the teeth 112 and the first side surface cover portion 122, and between the other circumferential side surface of the teeth 112 and the second side surface cover portion 123. This allows heat to be dissipated through the intervening members 15 on both the one circumferential side and the other circumferential side, thereby improving heat dissipation performance. Note that the above-described method of applying the intervening members 15 makes it easy to dispose the intervening members 15 on both the one circumferential side and the other circumferential side. However, the method of applying the intervening members 15 is not limited to the above-described method.

[0046] In at least one of the cases where the intervening member 15 flows downward through the gap between one circumferential side surface of the extension portion 112A and the first side cover portion 122 and reaches the lower end of the first side cover portion 122, and where the intervening member 15 flows upward through the gap between one circumferential side surface of the extension portion 112A and the third side cover portion 132 and reaches the upper end of the third side cover portion 132, the intervening member 15 is positioned in the gap S1 (see Figure 4) between the first side cover portion 122 and the third side cover portion 132.

[0047] In addition, in at least one of the cases where the intervening member 15 flows downward through the gap between the other circumferential side surface of the extension portion 112A and the second side surface cover portion 123 and reaches the lower end of the second side surface cover portion 123, and where the intervening member 15 flows upward through the gap between the other circumferential side surface of the extension portion 112A and the fourth side surface cover portion 133 and reaches the upper end of the fourth side surface cover portion 133, the intervening member 15 is positioned in the gap S2 (see Figure 4) between the second side surface cover portion 123 and the fourth side surface cover portion 133.

[0048] This allows the worker to easily confirm that, during the manufacturing process of the stator 1, the intervening member 15 is sufficiently positioned at least one between the circumferential side surface of the tooth 112 and the first side cover portion 122, or between the circumferential side surface of the tooth 112 and the third side cover portion 132, and that the intervening member 15 is sufficiently positioned at least one between the circumferential side surface of the tooth 112 and the second side cover portion 123, or between the circumferential side surface of the tooth 112 and the fourth side cover portion 133.

[0049] <4-2. Second embodiment> In this embodiment, an adhesive is used as the interposing member 15 in the first embodiment. The application method and arrangement of the interposing member 15 are the same as those in the first embodiment. That is, in the stator 1 of this embodiment, the interposing member 15 is an adhesive. This can improve the heat dissipation performance.

[0050] <4-3. Third embodiment> In this embodiment, in the manufacturing process of the stator 1, as shown in FIG. 6, an interposed member 16 serving as an expansion sheet is fixed to the other circumferential side surface of the first side surface cover portion 122 of the first insulator 12. The expansion sheet is a sheet containing a material that can expand when heated. By using an adhesive material for the expansion sheet, the expansion sheet can be attached to the first side surface cover portion 122. Alternatively, the expansion sheet may be attached to the first side surface cover portion 122 with double-sided tape.

[0051] 7 is an enlarged top cross-sectional view of a main part of the stator 1 of this embodiment. By attaching the first insulator 12 to which the intervening member 16 is fixed as described above to the teeth 112, the intervening member 16 is disposed between one circumferential side surface of the extension portion 112A and the first side surface cover portion 122 of the first insulator 12, as shown in FIG.

[0052] When the winding 14 generates heat due to the driving current, the interposition member 16, which is an expansion sheet, expands as shown in FIG. 7, causing the first insulator 12 to move toward one side in the circumferential direction. This causes the second side cover portion 123 of the first insulator 12 to move toward one side in the circumferential direction as shown in FIG. 7, and the second side cover portion 123 comes into direct contact with the other side surface of the extension portion 112A in the circumferential direction as shown in FIG. 8. This improves the thermal conductivity of heat generated in the winding 14 via the second side cover portion 123, thereby improving heat dissipation performance. Furthermore, because the interposition member 16 has a higher thermal conductivity than the air layer, the thermal conductivity via the first side cover portion 122 is improved. Furthermore, when the interposition member 16 is thick, the interposition member 16 also has the effect of reinforcing the first insulator 12. Furthermore, the process of fixing the interposition member 16 to the first insulator 12 in this embodiment is more efficient than the process of applying the interposition member as in the first and second embodiments.

[0053] The interposed member 16 may be fixed to one circumferential side surface of the second side surface cover portion 123 of the first insulator 12.

[0054] That is, the intervening member 16, which is an expansion sheet, is disposed between one circumferential side surface of the tooth 112 and the first side surface cover portion 122, or between the other circumferential side surface of the tooth 112 and the second side surface cover portion 123. As the expansion sheet expands, the first insulator 12 moves circumferentially toward the intervening member 16, and the first insulator 12 and the tooth 112 come into direct contact on the side opposite the intervening member 16, thereby increasing thermal conductivity. The expansion sheet also has a higher thermal conductivity than an air layer. This improves heat dissipation performance. Furthermore, since the intervening member 16 only needs to be disposed on one of the circumferential sides or the other circumferential sides of the tooth 112, the number of parts can be reduced and workability can be improved.

[0055] An intervening member, which is an expansion sheet, is fixed to the second insulator 13, as in the first insulator 12. Also in this embodiment, the above-mentioned conditional expression regarding the weight of the intervening member is satisfied.

[0056] <5.Other> The embodiments of the present disclosure have been described above. Note that the scope of the present disclosure is not limited to the above-described embodiments. The present disclosure can be implemented by adding various modifications to the above-described embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above-described embodiments can be combined in any appropriate manner as long as no contradiction occurs. [Industrial Applicability]

[0057] The technology disclosed herein can be widely used in vehicles such as electric motorcycles and automobiles, ships, aircraft, robots, home appliances, and the like. [Explanation of symbols]

[0058] 1 stator 2 rotors 3 shafts 4 1st bearing part 5 Second bearing part 6 Oil seal 7. Housing 8 Holder 9 Cover 10 Insulator 11 Stator core 12 First insulator 13 Second insulator 14 windings 15 Intervening member 16 Intervening member 21 Rotor core 22 Magnet 23 Plate 1 24 Second Plate 71 Bottom 71A Bearing holder 81 Bearing holder 100 motor 111 Coreback 112 Teeth 112A Extension part 112B Umbrella Club 121 Top cover 122 First side cover part 123 Second side cover part 124 First extension cover part 125 Second overhang cover 126 First core back cover part 127 Second core back cover part 131 Lower cover 132 Third side cover part 133 Fourth side cover part 134 Third overhang cover 135 4th overhang cover 136 Third core back cover part 137 4th core back cover part 151 Part 1 152 Part 2 153 Part 3 154 Part 4 155 Part 5 156 Part 6 200 electric motorcycle 201 Bike body 201a Seat part 202 front wheel 203 rear wheel 204 Handle J center axis S1, S2 gap T1, T2 overhang

Claims

1. a stator core including an annular core back centered on a central axis extending vertically, and teeth extending radially from the core back; an insulator disposed at least on the tooth; a winding disposed around the insulator; an interposition member disposed at least between the insulator and the tooth; and The weight of the intervening member disposed outside the gap between the insulator and the stator core is defined as W2, and W2=0. the interposing member is thermal grease or adhesive, the insulator includes a first insulator and a second insulator facing each other in a vertical direction; the first insulator has a first side surface cover portion covering one circumferential side surface of the tooth and a second side surface cover portion covering the other circumferential side surface of the tooth, the intervening member is disposed at least between one circumferential side surface of the tooth and the first side surface cover portion and between the other circumferential side surface of the tooth and the second side surface cover portion, The tooth has a first protruding portion protruding to one side in the circumferential direction and a second protruding portion protruding to the other side in the circumferential direction, the first insulator has a first protruding cover portion that radially covers the first protruding portion and a second protruding cover portion that radially covers the second protruding portion, A stator, wherein the intervening member includes a portion positioned in the gap between the first protruding portion and the first protruding cover portion, and a portion positioned in the gap between the second protruding portion and the second protruding cover portion.

2. the second insulator has a third side surface cover portion covering one circumferential side surface of the tooth and a fourth side surface cover portion covering the other circumferential side surface of the tooth, The stator according to claim 1 , wherein the interposition member is disposed in a gap between the first side cover portion and the third side cover portion and a gap between the second side cover portion and the fourth side cover portion.

3. a stator core including an annular core back centered on a central axis extending vertically, and teeth extending radially from the core back; an insulator disposed at least on the tooth; a winding disposed around the insulator; an interposition member disposed at least between the insulator and the tooth; and If the weight of the intervening member disposed in the gap between the insulator and the stator core is W1 and the weight of the intervening member disposed outside the gap is W2, then: W1≧W2×0.1 is satisfied, the insulator includes a first insulator and a second insulator facing each other in a vertical direction; the first insulator has a first side surface cover portion covering one circumferential side surface of the tooth and a second side surface cover portion covering the other circumferential side surface of the tooth, A stator in which the intervening member, which is an expansion sheet, is arranged only between one circumferential side surface of the tooth and the first side cover portion, or between the other circumferential side surface of the tooth and the second side cover portion.

4. The stator according to any one of claims 1 to 3; a rotor that faces the stator in a radial direction; A motor having

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