JP2010141960A - Insulating member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating member capable of improving heat dissipation from a coil to a core. <P>SOLUTION: The insulator 160 is an insulating member which is interposed between the coil and a stator core and insulates the coil from the stator core. The insulator 160 includes: a base material 10 having insulating performance; and a filling material 20 mixed in the base material 10 and having thermal conductivity higher than that of the base material 10. The filling material 20 has a longitudinal direction. The filling material 20 is oriented so that the longitudinal direction follows directions D1, D2 from the coil toward the stator core. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insulating member, and more particularly, to an insulating member that exists between a coil and a stator core and insulates the coil from the stator core.

  Conventionally, in order to improve the strength and heat resistance of an insulating member, an insulating member in which a filler is mixed with an insulating base material has been proposed. For example, in Patent Document 1, since the insulating sheet has a mesogenic group (functional group that exhibits liquid crystallinity) that exhibits liquid crystallinity, molecules form a higher order structure in the liquid crystal state, resulting in a polymer material. There has been proposed a configuration that is used as a heat conduction medium.

Further, in a rotating electrical machine such as a motor, it is important how efficiently the heat generated in the coil is cooled, and various conventional cooling structures for the rotating electrical machine have been proposed. For example, Patent Document 2 proposes a linear motor in which a thermally conductive anisotropic material is oriented so that heat generated from an armature coil is guided to a heat radiating portion. Patent Document 3 proposes a rotating electrical machine in which a cooling passage is provided in an insulator.
JP 2007-215280 A JP 2003-32993 A JP 2004-208461 A

  In order to efficiently dissipate the heat generated by the coil in the rotating electrical machine, the filler contained in the insulating member is made of a highly heat conductive filler, and the heat transferred from the coil to the insulating member is efficiently dissipated to the outside. It is possible to do. However, if the thermal conductivity of the filler is anisotropic, that is, it has a property that heat is easily transmitted in a specific direction of the filler, the thermal conductivity of the insulating member depends on the direction in which the filler is arranged. Anisotropy also occurs in the properties. If the insulating member has a property of good thermal conductivity in a direction different from the originally desired heat dissipation direction (for example, the direction from the coil to the core), the high thermal conductivity of the filler is not sufficiently utilized, and the coil As a result, there is a problem that the coil is not sufficiently cooled because heat is not efficiently radiated from the coil.

  This invention is made | formed in view of said problem, The main objective is to provide the insulating member which can improve the heat dissipation from a coil to a core.

  The insulating member according to the present invention is an insulating member that exists between the coil and the stator core and insulates the coil from the stator core. The insulating member includes an insulating base material and a filler mixed in the base material and having higher thermal conductivity than the base material. The filler has a longitudinal direction. The filler is oriented so that the longitudinal direction is along the direction from the coil toward the stator core.

  In the insulating member, preferably, the filler is oriented so that the longitudinal direction of the filler is along the thickness direction of the base material.

  Preferably, the insulating member includes a plurality of insulating pieces including a base material and a filler. The insulating piece is formed in a plate shape by processing a molding block. The filler contained in the molding block is oriented so that the longitudinal direction is along a certain direction that is the thickness direction of the insulating piece.

  Preferably, the filler is a ferromagnetic material, and the longitudinal direction of the filler is oriented in the direction of the magnetic field by molding the insulating member in a magnetic field.

  According to the insulating member of the present invention, the highly heat-conductive filler has a longitudinal direction, and the filler is oriented in the insulating member so that the longitudinal direction is along the direction from the coil toward the stator core. Since heat conduction tends to be good in the direction in which the longitudinal direction of the filler is oriented, the heat conductivity of the insulating member in the direction from the coil toward the stator core is improved. Therefore, heat can be efficiently radiated from the coil to the stator core via the insulating member. As a result, since the heat generated in the coil is efficiently released to the outside, the coil can be efficiently cooled.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
1 is a side sectional view showing a schematic configuration of a rotating electrical machine according to Embodiment 1 of the present invention. As shown in FIG. 1, the rotating electrical machine 100 is provided with a rotating shaft 110 that is rotatably supported around a rotation center line O, and is fixed to the rotating shaft 110 and rotatably provided with the rotating shaft 110. A rotor 120 and an annular stator 140 provided around the rotor 120 are provided. The rotating electrical machine 100 is typically mounted on a hybrid vehicle, and functions as a drive source that drives wheels, or a generator that generates electricity using power from an engine or the like. Moreover, it may be mounted on an electric vehicle or the like and used as a drive source for driving wheels.

  The rotor 120 is provided on a rotor core 125 configured by laminating a plurality of electromagnetic steel plates and the like, a permanent magnet 123 inserted into a magnet insertion hole 126 formed in the rotor core 125, and an axial end surface of the rotor core 125. And an end plate 122. The permanent magnet 123 is bonded and fixed by a resin 124 filled in the magnet insertion hole 126.

  The stator 140 is formed in an annular shape, and the stator core 141 formed in an annular shape so as to surround the rotor 120, a ring 181 attached to the outer periphery of the stator core 141, and a U-phase coil attached to the stator core 141 180U, V-phase coil 180V, and W-phase coil 180W. The stator core 141 is configured by laminating a plurality of unit steel plates 300. An insulating mold resin 172 is formed on axial end surfaces 177 and 178 of the stator 140 (stator core 141). The mold resin 172 includes, for example, a thermosetting resin such as BMC (Bulk Molding Compound) or an epoxy resin, or a thermoplastic resin such as PPS (Polyphenylene Sulfide) or PBT (Polybutylene Terephthalate).

  The stator 140 includes a yoke portion main body 170 that extends in an annular shape, and a plurality of stator teeth 171 that protrude radially inward from the inner peripheral surface of the yoke portion main body 170.

  FIG. 2 is a cross-sectional view of the stator taken along the line II-II shown in FIG. As shown in FIG. 2, the stator 140 is annularly arranged with a plurality of divided stator cores 175, an insulator 160 attached to the divided stator core 175, a coil 180 attached to the divided stator core 175 with the insulator 160 interposed therebetween. And a ring 181 that is attached to the outer peripheral side of the split stator core 175 and fixes the split stator core 175.

  Here, each divided stator core 175 includes an annular yoke portion 176 extending in the circumferential direction of the stator 140 and a stator tooth 171 protruding from the yoke portion 176 inward in the radial direction of the stator 140. Stator teeth 171 are formed at equal intervals along the circumferential direction of stator 140.

  Here, among the surfaces of the yoke portion 176, the circumferential end surfaces 190 and 191 arranged in the circumferential direction of the stator 140 are adjacent to the divided stator core 175 in the circumferential direction of the stator 140 and the circumference of the other divided stator core 175. The direction end surfaces 190 and 191 are in contact with each other. And the yoke part 176 of each division | segmentation stator core 175 is arranged in the circumferential direction, and the cyclic | annular yoke part main body 170 is comprised.

  FIG. 3 is an enlarged cross-sectional view in which a part of the stator shown in FIG. 2 is enlarged. As shown in FIG. 3, a slot is formed between adjacent stator teeth 171, and a coil 180 wound around stator teeth 171 is accommodated in the slot. The coil 180 has a square cross section perpendicular to the extending direction of the coil 180. Specifically, a flat wire such as an edge width coil is employed. For this reason, compared with a coil formed by winding a round wire, the space factor of the coil 180 accommodated in the slot (the ratio of the conductor in the cross section of the coil) is improved. The heat dissipation from 180 is also excellent.

  The coils 180 are sequentially wound so as to be sequentially laminated along the side surfaces 193 arranged in the circumferential direction of the stator 140 on the surface of the stator teeth 171.

  An insulating insulator 160 is provided between the coil 180 and the split stator core 175 to ensure insulation between the coil 180 and the split stator core 175. The insulator 160 is an insulating member that exists between the coil 180 and the divided stator core 175 included in the stator core 141 and insulates the coil 180 from the divided stator core 175.

  The insulator 160 is formed at a cylindrical teeth receiving portion 161 capable of receiving the stator teeth 171 and an end portion of the teeth receiving portion 161, extends along the inner peripheral surface 198 of the yoke portion 176, and is formed on the yoke portion 176. And an overhanging portion 162 supported by the inner peripheral surface 198. A flange portion 164 that protrudes in the direction of the rotation center line O is formed on an end surface in the axial direction, which is an end portion located on the rotation center line O side, of the peripheral surface of the teeth receiving portion 161.

  A coil 180 is wound around and mounted on the insulator 160 formed in this way. As shown in FIG. 3, the coil 180 is configured by winding a coil wire 280 whose cross-sectional shape perpendicular to the extending direction is a square shape. Teeth receiving portion 161 of insulator 160 is in contact with the inner periphery of wound coil 180. The overhanging portion 162 of the insulator 160 is in contact with the side surface of the wound coil 180.

  FIG. 4 is a perspective view of the insulator. As shown in FIG. 4, the insulator 160 includes an overhang portion 162, a pair of teeth receiving portions 161, and a pair of support columns 166. An opening 163 is formed in the projecting portion 162, and the insulator 160 is attached to the stator tooth 171 by passing the stator tooth 171 (see FIGS. 2 and 3) corresponding to the opening 163. When the insulator 160 is attached to the stator teeth 171, the overhanging portion 162 is disposed between the corresponding coil 180 (see FIGS. 2 and 3) and the inner peripheral surface 198 of the yoke portion 176 at the back of the slot. The coil 180 is insulated from the yoke portion 176 (see FIGS. 2 and 3).

  The teeth receiving portion 161 is directed from the end of the opening portion 163 of the overhanging portion 162 toward the inner circumferential direction of the stator core 141 (y direction shown in FIG. 4) so that the side surface 193 on the slot side of the stator teeth 171 can be covered. Extended. That is, the teeth receiving portion 161 insulates the coil 180 in the slot from the stator teeth 171 when the insulator 160 and the corresponding coil 180 are attached to the stator teeth 171.

  Further, a flange portion 164 is formed at the tip end portion of the teeth receiving portion 161 on the rotation center line O side (the end portion of the teeth receiving portion 161 on the side away from the protruding portion 162 in the y direction). The flange portion 164 is formed to be able to support the coil 180 attached to the insulator 160 in the stacking direction (y direction). That is, the flange portion 164 prevents the coil 180 attached to the insulator 160 from being collapsed in the inner peripheral direction of the stator core 141.

  Further, a side wall 165 is formed at each end of the teeth receiving portion 161 in the z direction. The side wall 165 is formed at each end in the z direction of the tooth receiving portion 161 in order to ensure insulation between the coil 180 and the stator teeth 171.

  The strut portion 166 is substantially in the middle between the pair of teeth receiving portions 161 and extends along the coil end side end surface of the stator teeth 171 from the end portion of the opening portion 163 of the overhang portion 162 in the inner circumferential direction of the stator core 141 ( (y direction). That is, the column portion 166 extends in a column shape from the overhanging portion 162 so as to follow the coil end side end surface of the stator teeth 171 while having a gap between the column portion 166 and the teeth receiving portion 161.

  When the insulator 160 and the corresponding coil 180 are attached to the stator teeth 171, the support 166 supports the coil 180 in the z direction and secures an insulation distance between the coil 180 and the stator teeth 171. That is, since a gap is provided between the support 166 and the teeth receiving portion 161, the coil end side end surface of the stator teeth 171 can be insulated from the stator teeth 171 where the entire surface is not covered by the insulator 160. The column portion 166 is formed so as to have at least a thickness (z direction) corresponding to a short distance.

  FIG. 5 is a perspective view of a state where a coil is attached to the insulator. As shown in FIG. 5, the coils 180 are attached to the insulator 160 from the y direction by bending the teeth receiving portions 161 in directions opposite to each other. The coil 180 is supported in the z direction by the support column 166, and the coil 180 is supported in the stacking direction (y direction) by the flange portion 164 provided at the tip of the teeth receiving portion 161.

  FIG. 6 is a perspective view of a state where a coil attached to an insulator is attached to a stator tooth. As shown in FIG. 6, after the coil 180 is attached to the insulator 160 (see FIG. 5), the coil 180 and the insulator 160 are integrally attached to the stator teeth 171.

  FIG. 7 is a cross-sectional view of a state where a coil is attached to the insulator along the line VII-VII shown in FIG. As shown in FIG. 7, the coil 180 is wound so that the coil wire 280 that is a conductor is laminated in the y direction, and the coil portion 180 is prevented from being collapsed by the flange portion 164 provided in the insulator 160. The When a flat conductor such as an edgewise coil is employed as the coil 180, the coil 180 can be supported by only supporting a part of the coil 180 with the flange portion 164. When the coil 180 is formed by a round wire or a square wire, the flange width 164 (length in the x direction) must be sufficiently secured to prevent the coil from collapsing, whereas the coil 180 If 180 is a flat wire, the flange width of the flange portion 164 can be reduced.

  FIG. 8 is an enlarged cross-sectional view in which a part of the insulator shown in FIG. 7 is enlarged. As shown in FIG. 8, the insulator 160 includes an insulating base material 10 and a filler (filler) 20 mixed with the base material 10. Filler 20 is formed of a material having higher thermal conductivity than base material 10. The material of the base material 10 may be an insulating material, and for example, a resin material such as PA (Polyamide), PBT (Polybutylene Terephthalate), PPS (Polyphenilen Sulfide), LCP (Liquid Crystal Polymer) can be used. . The material of the filler may be a material having a higher thermal conductivity than the material of the base material 10, and for example, an inorganic material such as a ceramic material typified by silica, alumina, or ferrite can be used. .

  As shown in FIG. 8, the filler 20 has a longitudinal direction. For example, the filler 20 may be formed in a fibrous shape. The filler 20 is mixed with the base material 10 so that the longitudinal direction is aligned with the thickness direction of the base material 10. As shown in FIG. 4, the teeth receiving portion 161 and the overhanging portion 162 of the insulator 160 are formed of plate-like members. The plate-like member includes a base material 10 and a filler 20, and the filler 20 is oriented so that the longitudinal direction of the filler 20 is along the thickness direction of the plate-like member. 7 and 8 is the thickness direction of the teeth receiving portion 161, and the filler 20 included in the teeth receiving portion 161 is oriented along the direction indicated by the double arrow D1. The double arrow D2 is the thickness direction of the overhang 162, and the filler 20 included in the overhang 162 is oriented along the direction indicated by the double arrow D2.

  The direction along the double arrows D1 and D2 is a direction from the coil 180 toward the split stator core 175, as shown in FIG. The longitudinal direction of the filler 20 is oriented along the direction from the coil 180 toward the divided stator core 175 included in the stator core 141.

  The filler 20 having the longitudinal direction has anisotropy in heat conduction. That is, the heat transfer method differs depending on the direction of the filler 20, and the heat transfer amount in the longitudinal direction of the filler 20 becomes larger than the heat transfer amount in the direction orthogonal to the longitudinal direction. Heat is more easily transferred in the longitudinal direction of the filler 20.

  In the insulator 160 manufactured by orienting the filler 20 so that the longitudinal direction of the filler 20 is along the direction from the coil 180 toward the stator core 141, the thermal conductivity in the direction from the coil 180 toward the stator core 141 is improved. ing. Therefore, heat can be efficiently radiated from the coil 180 to the stator core 141 via the insulator 160. As a result, since the heat generated in the coil 180 is efficiently released to the outside, the coil 180 can be efficiently cooled.

  Next, a method for manufacturing the insulator 160 will be described. FIG. 9 is a flowchart showing a method of manufacturing the insulator according to the first embodiment. As shown in FIG. 9, first, in the step (S11), a material for the insulator 160 is prepared. Specifically, a resin material such as PA, PBT, PPS, and LCA is prepared as a material for the base material 10. In addition, as a material for the filler 20, for example, a ceramic material such as silica, alumina, or ferrite is prepared. At this time, the material of the filler 20 is a material having a higher thermal conductivity than the material of the base material 10. The material of the filler 20 is formed into a shape having a longitudinal direction.

  Subsequently, in step (S12), a molding block is produced. When PA, PBT, PPS, LCA or the like is used as the material of the base material 10, these are thermoplastic resins, and therefore soften when heat is applied. When the temperature rises to the melting temperature, the thermoplastic resin begins to melt and flow, and when the temperature rises further, the viscosity decreases and the fluid easily flows. Utilizing such a property of the thermoplastic resin, the material of the filler 20 is mixed with the material of the base material 10 having a fluidity which is raised to a temperature at which molding is possible, and is extruded and filled into a mold, and then cooled. And harden. In this manner, a rectangular parallelepiped shaped block including the materials of the base material 10 and the filler 20 can be produced. FIG. 10 is a perspective view of the molding block.

  At this time, the material of the filler 20 has a longitudinal direction. Therefore, the material of the filler 20 is oriented so that the longitudinal direction of the material of the filler 20 is along the flow direction in which the material of the base material 10 flows, and the molding block 31 is manufactured. For example, when the direction of the double arrow shown in FIG. 10 is the molding direction of the molding block 31, the filler 20 included in the molding block 31 is oriented so that the longitudinal direction of the filler 20 is along the molding direction. .

  Returning to FIG. 9, subsequently, in step (S13), an insulating piece is produced. The insulating piece is a member formed into a plate shape including the base material 10 and the filler 20. Since the base material 10 is an insulating material, the insulating piece also has an insulating property. Such an insulating piece can be obtained by a process of slicing and cutting the molding block produced in the step (S12).

  FIG. 11 is a perspective view showing a state in which an insulating piece is produced. The individual insulating pieces 32 can be produced by slicing the molding block 31 shown in FIG. 10 with a plane orthogonal to the molding direction of the molding block 31 as a cut surface. In the insulating piece 32 manufactured in this way, the longitudinal direction of the filler 20 is oriented along the plate-like thickness direction.

  Further, the obtained insulating piece 32 is appropriately processed and formed into the shape of the teeth receiving portion 161, the overhang portion 162, and the flange portion 164.

  Returning to FIG. 9, the insulator is then assembled in step (S14). For example, the insulator 160 is assembled by molding the insulating piece 32 processed into the shape of the teeth receiving portion 161, the overhang portion 162, and the flange portion 164 by, for example, heating and cooling the end portion of the insulating piece 32. can do. Alternatively, the insulator 160 can be assembled and formed by attaching the insulating pieces 32 processed into the shapes of the teeth receiving portion 161, the overhanging portion 162, and the flange portion 164 to the base member having the contour shape of the insulator 160. it can.

  Thus, the insulator 160 as an insulating member is completed in the step (S15). The insulator 160 includes a plurality of insulating pieces 32 including the base material 10 and the filler 20.

  In the insulator 160 shown in FIGS. 7 and 8, the orientation directions of the fillers 20 included in the teeth receiving portion 161 and the overhanging portion 162 are directions along the double arrows D1 and D2, respectively, but are different from each other. This is common in that it is a direction along the thickness direction of the member. Therefore, according to the manufacturing method of the insulator 160 described above, the filler 20 contained in the molding block 31 is fixed in the thickness direction of the insulating piece 32 when processed into the plate-like insulating piece 32 (see FIG. 10). It is oriented so that the longitudinal direction is along the molding direction indicated by the double arrows.

  Therefore, the filler 20 can be easily oriented so that the longitudinal direction of the filler 20 is along the thickness direction of the plate-like insulating piece 32. The teeth receiving portion 161 and the overhanging portion 162 having different orientation directions of the filler 20 are divided and manufactured so that the longitudinal direction of the filler is oriented along the direction from the coil 180 toward the stator core 141. The insulator 160 can be manufactured easily.

(Embodiment 2)
FIG. 12 is a flowchart showing a method of manufacturing the insulator according to the second embodiment. The insulator 160 of the second embodiment is different from the first embodiment in that it is manufactured by a manufacturing method as shown in FIG. A method for manufacturing the insulator 160 according to the second embodiment will be described with reference to FIG.

  Specifically, in the step (S21), a material for the insulator 160 is prepared as in the first embodiment. At this time, as the filler 20, for example, a material having a ferromagnetic material such as ferrite which is a ceramic material mainly composed of iron oxide is prepared.

  Subsequently, in step (S22), a mold is prepared. FIG. 13 is a schematic cross-sectional view of a mold. As shown in FIG. 13, the mold includes an upper mold 41 and a lower mold 42. In the state where the upper mold 41 and the lower mold 42 are combined as shown in FIG. 13, a gap 43 is formed between the upper mold 41 and the lower mold 42. An opening 44 that communicates the gap 43 with the outside is formed between the upper mold 41 and the lower mold 42.

  Subsequently, in step (S23), a magnetic field is applied to the space including the mold. The arrows in FIG. 13 indicate the direction in which the magnetic field MF is formed. Subsequently, in step (S24), the insulator 160 is molded. For example, the material of the base material 10 which is a thermoplastic resin is heated to be in a flowable state, and the fluid is injected into the gap 43 from the opening 44 and cooled, whereby the teeth receiving portion 161 and the overhanging portion 162 are cooled. An insulator 160 having a portion and a flange portion 164 is formed.

  At this time, since the magnetic field MF is applied to the space including the mold and the insulator 160 is molded in the magnetic field MF, the ferromagnetic filler 20 is oriented in the direction of the magnetic field MF. In the filler 20 having the longitudinal direction, the filler 20 is oriented so that the longitudinal direction is along the direction of the magnetic field MF indicated by the arrow in FIG. That is, the insulator 160 is molded so that the longitudinal direction of the filler 20 is along the thickness direction with respect to both the teeth receiving portion 161 and the overhanging portion 162. In this way, the insulator 160 as an insulating member is completed in the step (S25).

  In general, when molding a resin, there is a feature that the filler is easily oriented so that the longitudinal direction of the filler is along the direction in which the resin flows in the mold. Therefore, when resin is molded using the mold shown in FIG. 13, it is usually difficult to orient the longitudinal direction of the filler in the thickness direction of the plate member. However, according to the method for manufacturing the insulator 160 of the second embodiment, the insulator 160 is molded in the magnetic field by applying the magnetic field MF. Oriented so that the longitudinal direction is along the thickness direction of the protruding portion 162. Therefore, similarly to Embodiment 1, the insulator 160 in which the longitudinal direction of the filler is oriented along the direction from the coil 180 toward the stator core 141 can be easily manufactured.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The insulating member of the present invention can be particularly advantageously applied to an insulating member that insulates a coil from a stator core in a rotating electrical machine mounted on a vehicle.

It is a sectional side view which shows schematic structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing of a stator along the II-II line | wire shown in FIG. FIG. 3 is an enlarged cross-sectional view in which a part of the stator shown in FIG. 2 is enlarged. It is a perspective view of an insulator. It is a perspective view in the state where a coil was attached to an insulator. It is a perspective view of the state where the coil with which the insulator was equipped was equipped with stator teeth. It is sectional drawing of the state in which the coil was mounted | worn with the insulator along the VII-VII line shown in FIG. FIG. 8 is an enlarged cross-sectional view in which a part of the insulator shown in FIG. 7 is enlarged. 3 is a flowchart illustrating a method for manufacturing the insulator according to the first embodiment. It is a perspective view of a molding block. It is a perspective view which shows the state which produced the insulation piece. 6 is a flowchart showing a method for manufacturing the insulator according to the second embodiment. It is a cross-sectional schematic diagram of a metal mold | die.

Explanation of symbols

  10 base material, 20 filler, 31 molding block, 32 insulating piece, 41 upper mold, 42 lower mold, 43 gap, 44 opening, 100 rotating electrical machine, 110 rotating shaft, 120 rotor, 122 end plate, 123 permanent Magnet, 124 Resin, 125 Rotor core, 126 Magnet insertion hole, 140 Stator, 141 Stator core, 160 Insulator, 161 Teeth receiving part, 162 Overhang part, 163 Opening part, 164 Flange part, 165 Side wall, 166 Post part, 170 Yoke part Main body, 171 stator teeth, 172 mold resin, 175 divided stator core, 176 yoke portion, 177,178 axial end face, 180 coil, 181 ring, 190,191 circumferential end face, 193 side face, 198 inner peripheral face, 280 coil wire.

Claims (4)

An insulating member that exists between the coil and the stator core and insulates the coil from the stator core;
An insulating base material;
Including a filler mixed with the base material and having higher thermal conductivity than the base material,
The filler has a longitudinal direction;
An insulating member in which the filler is oriented so that the longitudinal direction is along the direction from the coil toward the stator core.   The insulating member according to claim 1, wherein the filler is oriented so that the longitudinal direction is along the thickness direction of the base material. The insulating member includes a plurality of insulating pieces including the base material and the filler.
The insulating piece is formed into a plate by processing a molding block,
The insulating member according to claim 2, wherein the filler contained in the molding block is oriented so that the longitudinal direction is along a certain direction that is a thickness direction of the insulating piece. The filler is a ferromagnetic material,
The insulating member according to claim 1 or 2, wherein the longitudinal direction of the filler is oriented in the direction of the magnetic field by molding the insulating member in a magnetic field.

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