Stator, motor, and method of manufacturing the same

Abstract

To secure an insulation space distance while improving assembly workability.SOLUTION: A stator 410 has: a stator body 1 made of magnetic material having a plurality of core parts 11 around which a coil 4 is wound, and a peripheral part 12 connecting the respective core parts 11 in a circumferential direction; insulation paper 2 arranged along a side face 11b of the core part 11 and a peripheral surface 12b of the peripheral part 12 continued to the side face 11b; and an insulation member 3 arranged covering an axial direction end face 1a of the stator body 1. The insulation member 3 has wall parts 31B, 32B applied to the side face 11b and the axial direction end part of the peripheral surface 12b. With respect to the insulation paper 2, the axial direction end part is arranged between the wall parts 31B, 32B, the side face 11b, and the peripheral surface 12b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a stator, a motor, and a method for manufacturing a stator. [Background technology]

[0002] For example, Patent Document 1 discloses a conventional configuration in which an insulator is placed at both axial ends to cover the axial end faces of the salient pole portions on which windings are wound and the axial end faces of the outer periphery that connects multiple salient pole portions circumferentially, and insulating paper folded to fit the shapes of the axial surfaces of the salient pole portions and the outer periphery is placed on the outside of the insulator, with the insulator and insulating paper overlapping for a certain length in the axial direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-112205 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration disclosed in Patent Document 1, when winding the insulating paper, it is necessary to attach or temporarily fasten the insulating paper to the salient pole portion, the outer periphery, or the insulator to prevent misalignment of the insulating paper relative to the insulator. If the insulating paper is misaligned relative to the insulator, the overlap between the insulator and the insulating paper may not be constant, making it impossible to ensure the required insulation clearance. However, attaching or temporarily fastening the insulating paper to the salient pole portion, the outer periphery, or the insulator increases the number of steps and reduces the ease of assembly before winding the insulating paper.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a stator, a motor, and a method for manufacturing a stator that can improve assembly workability while ensuring an insulation spatial distance. [Means for solving the problem]

[0006] To achieve the above object, a stator according to one aspect of the present disclosure includes a stator body made of a magnetic material having a plurality of core portions around which coils are wound and a circumferential portion that circumferentially connects each of the core portions, an insulating paper disposed along a side surface of the core portion and a circumferential surface of the circumferential portion continuous with the side surface, and an insulating member disposed so as to cover an axial end surface of the stator body. The insulating member has a wall portion that hangs on axial end portions of the side surface and the circumferential surface, and the insulating paper has an axial end portion disposed between the wall portion and the side surface and the circumferential surface.

[0007] As a desirable aspect of the above stator, the insulating paper is formed to have a length equal to or less than an axial dimension of the stator body.

[0008] As a desirable aspect of the above stator, when the axial dimension of the insulating paper is A, the axial dimension of the wall portion of one of the insulating members is B, and the axial dimension of the stator body is C, the relationship C - 2B < A ≤ C is satisfied.

[0009] As a desirable aspect of the above stator, when the axial dimension of the insulating paper is A mm, the axial dimension of the wall portion of one of the insulating members is B mm, and the axial dimension of the stator body is C mm, the relationship B - (C - A) ≥ 2.4 mm is satisfied.

[0010] As a desirable aspect of the above stator, the stator body and the insulating member are combined by generating frictional force through the insulating paper.

[0011] As a desirable aspect of the above stator, the insulating member is made of an elastic material.

[0012] As a desirable aspect of the above stator, the insulating member is made of a synthetic resin.

[0013] As a desirable aspect of the above stator, the insulating paper is disposed along the side surface and the circumferential surface against its own elastic force.

[0014] <000005^{7}>In a preferred embodiment of the above stator, the insulating paper is arranged over the side surfaces of two circumferentially adjacent core portions and the peripheral surface of the peripheral portion between each of the core portions, and the insulating member is configured to be connected over each of the core portions and the peripheral portion between each of the core portions.

[0015] In order to achieve the above object, a motor according to one aspect of the present disclosure includes the above-described stator and a rotor that rotates when current is applied to the coil of the stator.

[0016] In order to achieve the above-mentioned object, one embodiment of the present disclosure provides a method for manufacturing a stator including: a stator body made of a magnetic material having a core portion around which a coil is wound and a circumferential portion that connects the core portion circumferentially; insulating paper arranged along the side surface of the core portion and the circumferential surface of the circumferential portion that is continuous with the side surface; and a pair of insulating members arranged to cover the axial end surface of the stator body and having wall portions that hang over the axial ends of the side surface and the circumferential surface, the method including the steps of: positioning one axial end of the insulating paper between the wall portion of one of the insulating members and the side surface and the circumferential surface; positioning the other insulating member on the stator body so that the other axial end of the insulating paper is between the wall portion of the other insulating member and the side surface and the circumferential surface; and winding the coil around the core portion from above each of the insulating members and the insulating paper. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to improve assembly workability while ensuring an insulating spatial distance. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing a motor according to an embodiment. [Figure 2] FIG. 2 is a partial perspective view showing the stator of the embodiment. [Figure 3] FIG. 3 is a partially exploded perspective view of the stator. [Figure 4]FIG. 4 is a cross-sectional view of FIG. [Figure 5] FIG. 5 is a vertical cross-sectional view of FIG. [Figure 6] FIG. 6 is a cross-sectional view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, modes for carrying out the invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments. Furthermore, the components in the following embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the following embodiments can be combined as appropriate.

[0020] FIG. 1 is a cross-sectional view showing a motor according to an embodiment.

[0021] The motor 100 shown in FIG. 1 is, as an example, a direct drive motor. A direct drive motor transmits rotational force directly to a rotor without the need for a reduction mechanism (e.g., a reduction gear, a transmission belt, etc.), thereby rotating the rotor. The motor 100 may be of an outer rotor type or an inner rotor type. In the embodiment, an inner rotor type is illustrated and described. The present disclosure is also applicable to outer rotor type motors.

[0022] The motor 100 includes a base 200, a rotor 300 (also referred to as a motor output shaft), and a motor unit 400. The motor 100 is configured as a whole with a central axis Ax as its center. In this embodiment, the direction parallel to the direction in which the central axis Ax extends is referred to as the axial direction. The direction perpendicular to the central axis Ax (axial direction) is referred to as the radial direction, with the radially inner side referring to the side approaching the central axis Ax in the radial direction and the radially outer side referring to the side moving away from the central axis Ax in the radial direction. The direction around the central axis Ax is referred to as the circumferential direction.

[0023] The base 200 is an annular member centered on the central axis Ax. The base 200 has a fixed portion 221, an inclined portion 222, and a vertical wall portion 223. The fixed portion 221 is formed in a plate shape with a through hole in the center. The fixed portion 221 is placed on a base 110 that supports the motor 100 and is fixed to the base 110. The inclined portion 222 is formed in a cone shape with a through hole in the center. The inclined portion 222 is continuous with a radially inner end portion 221a that is a through portion of the fixed portion 221, and extends obliquely in the axial direction while extending radially inward and narrowing away from the fixed portion 221. The vertical wall portion 223 is formed in a cylindrical shape with a through hole in the center. The vertical wall portion 223 is continuous with an end portion 222a that is a through portion of the narrowed portion of the inclined portion 222, and extends along the axial direction away from the inclined portion 222.

[0024] The vertical wall portion 223 has a first step portion 223a and a second step portion 223b formed continuously in the circumferential direction on the radially outer side, which is the outer periphery. The first step portion 223a is formed closer to the inclined portion 222 in the axial direction, and the second step portion 223b is formed on the side away from the inclined portion 222 in the axial direction. The inner periphery of the bearing 230 is fitted into the first step portion 223a. The bearing 230 is formed in an annular shape centered on the central axis Ax. The second holder 225 is placed on the second step portion 223b. The second holder 225 is formed in an annular shape centered on the central axis Ax. The second holder 225 abuts against the inner periphery of the bearing 230. The second holder 225 is fastened to the second step portion 223b via bolts BL2. As a result, the inner peripheral portion of the bearing 230 is sandwiched in the axial direction between the second holder 225 and the first step portion 223a. Furthermore, the first holder 224 is disposed at the end of the vertical wall portion 223 extending in the axial direction. The first holder 224 is formed in a cylindrical shape centered on the central axis Ax. The first holder 224 is fastened to the vertical wall portion 223 via bolts BL1.

[0025] The rotating body 300 is formed in an annular shape centered on the central axis Ax. The rotating body 300 is disposed so as to surround the radially outer sides of the vertical wall portion 223 and the first holder 224 of the base 200. The rotating body 300 has a third holder 326 and a fourth holder 327. The third holder 326 and the fourth holder 327 are formed in an annular shape centered on the central axis Ax and are divided in the axial direction. The third holder 326 has a third step portion 326a on its radially inner side. The fourth holder 327 has a fourth step portion 327a on its radially inner side. The third step portion 326a and the fourth step portion 327a are provided opposite each other in the axial direction. The third holder 326 and the fourth holder 327 are fastened to each other via bolts BL3. As a result, the outer periphery of bearing 230 is sandwiched in the axial direction between third step portion 326a and fourth step portion 327a. Therefore, rotating body 300 is rotatably supported on base 200 via bearing 230, and rotates around central axis Ax. Various workpieces (not shown) are attached to rotating body 300, and the various workpieces rotate together with rotating body 300.

[0026] The third holder 326 of the rotating body 300 is disposed radially opposite the first holder 224 of the base 200. A rotation sensor 120 is provided between the third holder 326 and the first holder 224. The rotation sensor 120 has a pair of members that are radially opposite to each other. One of the pair of members is fixed to the third holder 326 via a bolt BL4, and the other is fixed to the first holder 224 via a bolt BL5. The rotation sensor 120 detects the rotational state (e.g., the rotation angle) of the rotating body 300. By detecting the rotational state of the rotating body 300 using the rotation sensor 120, various workpieces attached to the rotating body 300 can be rotated by a predetermined angle and positioned at a predetermined rotational position. Note that the rotation sensor 120 may be implemented by a detection element such as a resolver. The rotation sensor 120 is covered by a disc-shaped cover 101 attached to the first holder 224 to protect it from the outside.

[0027] The motor section 400 is provided on the fixed section 221 of the base 200 and the rotating body 300, and rotates the rotating body 300. The motor section 400 has a stator 410 and a rotor 420. The stator 410 and the rotor 420 are formed in an annular shape around a central axis Ax. The stator 410 and the rotor 420 are arranged facing each other in the radial direction.

[0028] In this embodiment, the stator 410 is disposed radially outward of the rotor 420. As will be described in detail later, the stator 410 includes a stator body 1, an insulating member (insulator) 3, insulating paper 2 (not shown in FIG. 1), and coils 4. The stator 410 is fixed to a fixing portion 221 of the base 200 via a bolt BL6. One axial end of the stator 410 is covered by the fixing portion 221 of the base 200. The other axial end of the stator 410 is covered by an annular cover 130. The cover 130 is fixed to the base 200 with a bolt BL7.

[0029] The rotor 420 has a rotor body 421 and a permanent magnet 422. The permanent magnet 422 is fixed to the radially outer side of the rotor body 421 by adhesive. The rotor body 421 of the rotor 420 is fixed to the third holder 326 via bolts BL8. The permanent magnet 422 includes a first magnet 422a and a second magnet 422b. The first magnet 422a is arranged on one side in the axial direction, and the second magnet 421b is arranged on the other side in the axial direction. The combined axial dimension of the first magnet 422a and the second magnet 422b is approximately the same as the axial dimension of the rotor body 421 and the axial dimension of the stator body 1 of the stator 410.

[0030] In the motor 100, the rotor 420 rotates according to Fleming's left-hand rule due to the interaction between the magnetism generated in the stator 410 by energizing the coil 4 and the magnetism of the permanent magnet 422 of the rotor 420, and a rotational force can be applied to the rotating body 300 via the rotor 420. This allows the motor 100 to rotate various workpieces attached to the rotating body 300. The motor 100 of this embodiment can also be configured as an inner rotor type in which the rotor 420 is disposed radially inside the stator 410. Although not shown in the drawings, in the case of an outer rotor type motor, an annular rotor is disposed radially outside the annular stator.

[0031] FIG. 2 is a partial perspective view showing a stator of an embodiment. FIG. 3 is a partially exploded perspective view of the stator. FIG. 4 is a horizontal cross-sectional view of FIG. 2 (a cross-sectional view taken along line II in FIG. 5, perpendicular to the axial direction). FIG. 5 is a vertical cross-sectional view of FIG. 2 (a cross-sectional view taken along line II-II in FIG. 6, parallel to the axial direction). FIG. 6 is a horizontal cross-sectional view of FIG. 2 (a cross-sectional view taken along line III-III in FIG. 5, perpendicular to the axial direction). Note that the coil 4 is omitted in FIGS. 3 to 6.

[0032] As described above, the stator 410 of the embodiment includes the stator body 1, the insulating paper 2 (not shown in FIG. 1), the insulating member (insulator) 3, and the coil 4.

[0033] The stator body 1 is made of a magnetic material and has an annular shape centered on the central axis Ax. The stator body 1 has a plurality of core portions (teeth) 11 and a peripheral portion 12 that connects the core portions 11 in the circumferential direction. That is, the core portions 11 are arranged in a line in the circumferential direction by the peripheral portion 12. As shown in FIG. 4 , the base ends of the core portions 11 are integrally connected to the peripheral portion 12, and the tips extend toward the central axis Ax. The core portions 11 have protrusions 11a protruding from both sides in the circumferential direction at their tips. That is, the core portions 11 have a substantially T-shape when viewed from the axial direction. The surfaces of the core portions 11 that face each other in the circumferential direction are called side surfaces 11b. The peripheral portion 12 is formed in an annular shape centered on the central axis Ax. The peripheral portion 12 has through holes 12a formed along the axial direction at the portions where the base ends of the core portions 11 are connected. The bolts BL6 are inserted into the through holes 12a. In the peripheral portion 12, a surface facing radially inward between circumferentially adjacent core portions 11 is called a peripheral surface 12b. The peripheral surface 12b is continuous with each of the side surfaces 11b that face each other in the circumferential direction.

[0034] The insulating paper 2 is formed as a film made of an electrical insulating material. As shown in Fig. 4, the insulating paper 2 is arranged continuously in the stator body 1 over the side surfaces 11b of the core portions 11 adjacent in the circumferential direction and the peripheral surface 12b of the peripheral portion 12 between these side surfaces 11b, and also arranged continuously in the axial direction. The insulating paper 2 is formed by bending a single flat sheet so that it is arranged over the side surfaces 11b of the core portions 11 adjacent in the circumferential direction and the peripheral surface 12b of the peripheral portion 12 between these side surfaces 11b. As a result, it generates an elastic force that tries to return to its flat shape, allowing it to be arranged along the side surfaces 11b and the peripheral surface 12b.

[0035] The insulating member 3 is made of synthetic resin, which is an electrically insulating and elastic material. The insulating member 3 is arranged on both axial end faces 1a (see FIG. 5) of the stator body 1. As shown in FIG. 3, the insulating member 3 has a first insulating member 31 arranged at one axial end (also referred to as the upper end) of the stator body 1, and a second insulating member 32 arranged at the other axial end (also referred to as the lower end) of the stator body 1.

[0036] The first insulating member 31 has an end surface portion 31A, a wall portion 31B, a hole portion 31C, and a standing wall portion 31D. The end surface portion 31A is a portion that covers the axial end of the stator body 1. The end surface portion 31A has a core end surface portion 31Aa shaped to match the shape of one core portion 11 as viewed from the axial direction, and a peripheral end surface portion 31Ab shaped to match the shape of a portion of the peripheral portion 12 to which the base end of the one core portion 11 is connected as viewed from the axial direction, and these core end surface portion 31Aa and peripheral end surface portion 31Ab are formed integrally and continuously.

[0037] The wall portion 31B extends axially from the end face portion 31A and is formed to hang over the axial ends of the side surface 11b of the core portion 11 and the peripheral surface 12b of the peripheral portion 12. The wall portion 31B has a protrusion side wall portion 31Ba that hangs over the side surface 11b of the protrusion portion 11a of the core portion 11, a side wall portion 31Bb that hangs over the side surface 11b of the core portion 11 other than the protrusion portion 11a, and a peripheral wall portion 31Bc that hangs over the peripheral surface 12b of the peripheral portion 12, and these protrusion side wall portions 31Ba, side wall portion 31Bb, and peripheral wall portion 31Bc are integrally formed continuously. The protrusion side wall portions 31Ba are arranged circumferentially opposite each other on both sides of the core end face portion 31Aa. The side wall portions 31Bb are arranged circumferentially opposite each other on both sides of the core end face portion 31Aa. The peripheral wall portion 31Bc is disposed radially opposite to the protrusion side wall portion 31Ba.

[0038] The hole 31C is a cutout portion provided in the peripheral end surface portion 31Ab so as to avoid the through-hole 12a of the peripheral portion 12.

[0039] The standing wall portion 31D is formed at the radially inner end of the core end face portion 31Aa so as to extend in the axial direction away from the core end face portion 31Aa. The standing wall portion 31D provides radial support when the coil 4 is wound.

[0040] A plurality of first insulating members 31 (two in FIG. 3) configured in this manner are formed continuously in the circumferential direction.

[0041] The second insulating member 32 has a shape that is approximately symmetrical in the axial direction to the first insulating member 31. The second insulating member 32 has an end face portion 32A, a wall portion 32B, a first standing wall portion 32D, and a second standing wall portion 32E. The end face portion 32A is a portion that covers the axial end of the stator body 1. The end face portion 32A has a core portion end face portion 32Aa that has a shape that matches the shape of one core portion 11 when viewed from the axial direction.

[0042] The wall portion 32B extends axially from the end surface portion 31A and is formed to hang over the axial ends of the side surface 11b of the core portion 11 and the peripheral surface 12b of the peripheral portion 12. The wall portion 32B has a protrusion side wall portion 32Ba that hangs over the side surface 11b of the protrusion portion 11a of the core portion 11, a side wall portion 32Bb that hangs over the side surface 11b of the core portion 11 other than the protrusion portion 11a, and a peripheral wall portion 32Bc that hangs over the peripheral surface 12b of the peripheral portion 12, and these protrusion side wall portions 32Ba, side wall portion 32Bb, and peripheral wall portion 32Bc are integrally formed continuously. The protrusion side wall portions 32Ba are arranged circumferentially opposite each other on both sides of the core end surface portion 32Aa. The side wall portions 32Bb are arranged circumferentially opposite each other on both sides of the core end surface portion 32Aa. The peripheral wall portion 32Bc is disposed radially opposite the protrusion side wall portion 32Ba.

[0043] The first standing wall portion 32D is formed at the radially inner end of the core end face portion 32Aa and extends in the axial direction away from the core end face portion 32Aa. The first standing wall portion 32D provides radial support when the coil 4 is wound.

[0044] The second standing wall portion 32E is formed at the radially outer end of the core end face portion 32Aa and the circumferential wall portion 32Bc, and extends in the axial direction away from the core end face portion 32Aa and the circumferential wall portion 32Bc. The second standing wall portion 32E radially supports the coil 4 when it is wound, and is disposed between the fixed portion 221 of the base 200 and the coil 4 to provide insulation.

[0045] A plurality of second insulating members 32 (two in FIG. 3) configured in this manner are formed continuously in the circumferential direction.

[0046] 5 and 6, in the stator 410 of this embodiment, the axial ends of the insulating paper 2 are arranged between the wall portions 31B, 32B of the insulating member 3 and the side surface 11b and circumferential surface 12b of the stator body 1. That is, one axial end of the insulating paper 2 is arranged between the wall portion 32B (projection portion side wall portion 32Ba, side wall portion 32Bb, and circumferential wall portion 32Bc) of the second insulating member 32 and the side surface 11b and circumferential surface 12b of the stator body 1. Furthermore, the other axial end of the insulating paper 2 is arranged between the wall portion 31B (projection portion side wall portion 31Ba, side wall portion 31Bb, and circumferential wall portion 31Bc) of the first insulating member 31 and the side surface 11b and circumferential surface 12b of the stator body 1.

[0047] The manufacturing method (assembly method) of the stator 410 configured as described above first places the second insulating member 32 on the stator body 1, and then places one axial end of the insulating paper 2 between the wall portion 32B (projection side wall portion 32Ba, side wall portion 32Bb, and circumferential wall portion 32Bc) of this second insulating member 32 and the side surface 11b and circumferential surface 12b of the stator body 1. That is, in the manufacturing method of the stator 410 of this embodiment, after placing the second insulating member 32 on the stator body 1, the insulating paper 2 is inserted between the wall portion 32B of the second insulating member 32 and the side surface 11b and circumferential surface 12b of the stator body 1.

[0048] The second insulating member 32 is an electrical insulator and is formed of an elastic material, with the opposing protrusion side wall portions 32Ba generating an elastic force to sandwich the side surface 11b of each protrusion 11a of the core portion 11, the opposing side wall portions 32Bb generating an elastic force to sandwich the side surface 11b of the core portion 11, and the opposing peripheral wall portions 32Bc and protrusion side wall portions 32Ba generating an elastic force to press against the peripheral surface 12b of the peripheral portion 12. The elastic force of this second insulating member 32 acts as an intermediate fit or an interference fit with the stator body 1 and the insulating paper 2, generating a frictional force between the stator body 1 and the insulating paper 2. As a result, the second insulating member 32 is attached to the stator body 1 and supports one axial end of the insulating paper 2 relative to the stator body 1.

[0049] Furthermore, because the insulating paper 2 is formed by bending a single flat sheet, it generates an elastic force that tries to return it to its flat state, and is arranged along the side surface 11b and circumferential surface 12b of the stator body 1. Therefore, in the stator 410 of this embodiment, the insulating paper 2 is pressed against the side surface 11b and circumferential surface 12b of the stator body 1 by its own elastic force, preventing it from falling off from the stator body 1. For this reason, in the manufacturing method of the stator 410 of this embodiment, after the insulating paper 2 is arranged on the stator body 1, the second insulating member 32 may be arranged on the stator body 1, and the insulating paper 2 may be arranged between the wall portion 32B of the second insulating member 32 and the side surface 11b and circumferential surface 12b of the stator body 1.

[0050] Next, the first insulating member 31 is placed in the stator body 1, and the other axial end of the insulating paper 2 is placed between the wall portion 31B (protrusion side wall portion 31Ba, side wall portion 31Bb and peripheral wall portion 31Bc) of this first insulating member 31 and the side surface 11b and peripheral surface 12b of the stator body 1.

[0051] The first insulating member 31 is an electrical insulator and is made of an elastic material, and generates an elastic force such that the opposing protrusion side wall portions 31Ba sandwich the side surface 11b of each protrusion 11a of the core portion 11, the opposing side wall portions 31Bb sandwich the side surface 11b of the core portion 11, and the opposing peripheral wall portions 31Bc and protrusion side wall portions 31Ba press against the peripheral surface 12b of the peripheral portion 12. The elastic force of this first insulating member 31 acts as an intermediate fit or an interference fit with the stator body 1 and the insulating paper 2, generating a frictional force between the stator body 1 and the insulating paper 2. As a result, the first insulating member 31 is attached to the stator body 1 and supports the other axial end of the insulating paper 2 relative to the stator body 1.

[0052] Alternatively, the first insulating member 31 may be disposed on the stator body 1 first, and then the second insulating member 32 may be disposed on the stator body 1 .

[0053] Next, the coil 4 is wound around the core 11, the side surface 11b of which is covered with the insulating paper 2 and the axial end surface 1a of which is covered with the insulating member 3, to assemble the stator 410.

[0054] Thus, the stator 410 of the embodiment comprises a stator body 1 made of a magnetic material having a plurality of core portions 11 around which coils 4 are wound and peripheral portions 12 connecting each core portion 11 circumferentially, insulating paper 2 arranged along the side surface 11b of the core portion 11 and the peripheral surface 12b of the peripheral portion 12 continuous with the side surface 11b, and an insulating member 3 arranged to cover the axial end face 1a of the stator body 1, the insulating member 3 having wall portions 31B, 32B hanging over the axial ends of the side surface 11b and the peripheral surface 12b, and the axial end of the insulating paper 2 arranged between the wall portions 31B, 32B and the side surface 11b and the peripheral surface 12b.

[0055] Therefore, according to the stator 410 of this embodiment, the axial ends of the insulating paper 2 are disposed between the wall portions 31B, 32B of the insulating member 3 and the side surface 11b and circumferential surface 12b of the stator body 1, so that the insulating paper 2 is supported by the insulating member 3 on the stator body 1 and prevented from shifting when the coil 4 is wound. Also, according to the stator 410 of this embodiment, the axial ends of the insulating paper 2 are disposed between the wall portions 31B, 32B of the insulating member 3 and the side surface 11b and circumferential surface 12b of the stator body 1, so that the insulation clearance is reliably obtained. As a result, according to the stator 410 of this embodiment, the insulation clearance can be secured while improving assembly workability.

[0056] 5, in the stator 410 of this embodiment, the insulating paper 2 is formed to be shorter than the axial dimension of the stator body 1. That is, as shown in FIG. 5, when the axial dimension of the insulating paper 2 is A mm and the axial dimension of the stator body 1 is C mm, the relationship A≦C is satisfied.

[0057] Therefore, according to the stator 410 of the embodiment, since the insulating paper 2 is formed to have a length equal to or less than the axial dimension of the stator body 1, it is prevented from being axially pushed by the insulating member 3 disposed on the axial end face 1a of the stator body 1. As a result, according to the stator 410 of the embodiment, the insulating paper 2 is not twisted or wrinkled, and the assembly workability can be improved. Here, when the axial dimension of the insulating paper 2 is A, the axial dimensions of the wall portions 31B and 32B of one insulating member 3 (the dimension in the axial direction from the axial end face 1a of the stator body 1) is B, and the axial dimension of the stator body 1 is C, the relationship C - 2B < A ≤ C is satisfied. That is, by setting the axial dimension A in which the insulating paper 2 is disposed inside the wall portions 31B and 32B of the insulating member 3, the insulating space distance can be ensured.

[0058] Further, in the stator 410 of the embodiment, as shown in FIG. 5, when the axial dimension of the insulating paper 2 is Amm, the axial dimensions of the wall portions 31B and 32B of one insulating member 3 (the dimension in the axial direction from the axial end face 1a of the stator body 1) is Bmm, and the axial dimension of the stator body 1 is Cmm, the relationship B - (C - A) ≥ 2.4 mm is satisfied. That is, the axial dimension Dmm in which the axial end portion of the insulating paper 2 is disposed between the wall portions 31B and 32B of the insulating member 3 and the side surface 11b and the circumferential surface 12b of the stator body 1 can be made 2.4 mm. 2.4 mm is determined as the insulating space distance of the motor 100 for preventing sparks in the safety standard. As a result, according to the stator 410 of the embodiment, the insulating space distance can be ensured. In FIG. 5, one axial end portion (the lower end portion in FIG. 5) of the insulating paper 2 is disposed along all of the wall portion 32B of one insulating member 3 (the second insulating member 32) and is sandwiched between the wall portion 32B and the side surface 11b and the circumferential surface 12b of the stator body 1. Even in such a state, the axial dimension Dmm in which the other axial end portion (the upper end portion in FIG. 5) of the insulating paper 2 is disposed between the wall portion 31B of the other insulating member 3 (the first insulating member 31) and the side surface 11b and the circumferential surface 12b of the stator body 1 can be made 2.4 mm.

[0059] Further, in the stator 410 of the embodiment, the stator body 1 and the insulating member 3 are combined by generating frictional force through the insulating paper 2.

[0060] Therefore, according to the stator 410 of the embodiment, the insulating member 3 is attached to the stator body 1, and the axial end of the insulating paper 2 can be supported relative to the stator body 1. As a result, according to the stator 410 of the embodiment, assembly can be performed without temporary fastening or the like, thereby improving the ease of assembly.

[0061] In the stator 410 of the embodiment, the insulating member 3 is made of an elastic material.

[0062] Therefore, according to the stator 410 of this embodiment, the above-mentioned frictional force can be obtained by the elastic force.

[0063] In the stator 410 of the embodiment, the insulating member 3 is made of synthetic resin.

[0064] Therefore, the stator 410 of this embodiment can provide the above-mentioned elastic force.

[0065] In addition, in the stator 410 of this embodiment, the insulating paper 2 is arranged along the side surface 11b of the core portion 11 and the peripheral surface 12b of the peripheral portion 12 against its own elastic force.

[0066] Specifically, in the stator 410 of this embodiment, when a flat piece of insulating paper 2 is bent, it generates an elastic force that causes the insulating paper 2 to return to a flat shape. The insulating paper 2 is arranged along the side surface 11b and the circumferential surface 12b against this elastic force, and is therefore pressed against the side surface 11b and the circumferential surface 12b. As a result, the stator 410 of this embodiment can prevent the insulating paper 2 from shifting during assembly, improving the ease of assembly.

[0067] In addition, in the embodiment of the stator 410, the insulating paper 2 is arranged over the side surfaces 11b of two circumferentially adjacent core portions 11 and the peripheral surfaces 12b of the peripheral portions 12 between each core portion 11, and the insulating member 3 is configured to be connected over each circumferentially adjacent core portion 11 and the peripheral portions 12 between each core portion 11.

[0068] Therefore, according to the stator 410 of the embodiment, the insulating members 3 attached to the core portions 11 adjacent to each other in the circumferential direction are connected to each other. As a result, according to the stator 410 of the embodiment, the insulating members 3 can be attached to the multiple core portions 11 collectively, improving the ease of assembly.

[0069] The motor 100 of the embodiment also includes the stator 410 described above, and a rotor 420 that rotates when the coil 4 of the stator 410 is energized.

[0070] Therefore, according to the motor 100 of the embodiment, it is possible to reduce manufacturing costs by improving the workability of assembling the stator 410. Furthermore, according to the motor 100 of the embodiment, it is possible to improve performance by ensuring the insulation spatial distance of the stator 410.

[0071] In addition, the manufacturing method of the stator 410 of the embodiment includes the steps of: positioning one axial end of the insulating paper 2 between the wall portion 32B of one insulating member 3 (second insulating member 32) and the side surface 11b and peripheral surface 12b; positioning the other insulating member 3 (first insulating member 31) in the stator body 1 so that the other axial end of the insulating paper 2 is positioned between the wall portion 31B of the other insulating member 3 (first insulating member 31) and the side surface 11b and peripheral surface 12b; and winding the coil 4 around the core portion 11 from above each insulating member 3 and insulating paper 2.

[0072] According to the manufacturing method of the stator 410 of the embodiment, one axial end of the insulating paper 2 is disposed between the wall portion 32B of one insulating member 3 (second insulating member 32) and the side surface 11b and circumferential surface 12b. This allows one axial end of the insulating paper 2 to be supported by one insulating member 3 (second insulating member 32). Then, the other insulating member 3 (first insulating member 31) is disposed on the stator main body 1 so that the other axial end of the insulating paper 2 is disposed between the wall portion 31B of the other insulating member 3 (first insulating member 31) and the side surface 11b and circumferential surface 12b. This allows assembly without temporarily fastening the insulating paper 2 to the stator main body 1. As a result, the manufacturing method of the stator 410 of the embodiment can improve the assembly workability of the stator 410. Furthermore, according to the manufacturing method of the stator 410 of the embodiment, the axial end of the insulating paper 2 is disposed between the wall portions 31B, 32B of each insulating member 3 and the side surface 11b and circumferential surface 12b of the stator main body 1, ensuring an insulating spatial distance. [Explanation of symbols]

[0073] 1 Stator body 1a Axial end face 2 insulating paper 3(31,32) Insulating material 31B Wall section 32B Wall section 4 coils 11 Core 11b Side 12 Periphery 12b Circumferential surface 100 motor 410 Stator 420 rotor

Claims

1. a stator body made of a magnetic material having a plurality of core portions around which coils are wound and a circumferential portion connecting the core portions in the circumferential direction; an insulating paper sheet disposed along a side surface of the core portion and a peripheral surface of the peripheral portion that is continuous with the side surface; an insulating member disposed to cover an axial end surface of the stator body; Equipped with the insulating member has a wall portion extending from axial ends of the side surface and the circumferential surface, the thickness of the wall portion is constant over the entire axial length of the wall portion; an axial end of the insulating paper is disposed between the wall portion and the side surface and the peripheral surface; Furthermore, the insulating member is made of an elastic material, and generates an elastic force at the wall portion pressing the side surface of the core portion and the peripheral surface of the peripheral portion, thereby acting as a transition fit or an interference fit with the axial end portions of the stator body and the insulating paper, The stator body and the insulating member are combined with each other by generating frictional force via the insulating paper. Stator.

2. 2. The stator according to claim 1, wherein the insulating paper is formed to have a length equal to or less than the axial dimension of the stator body.

3. 3. The stator according to claim 1, wherein the axial dimension of the insulating paper is A, the axial dimension of the wall portion of one of the insulating members is B, and the axial dimension of the stator body is C, and the relationship C-2B<A≦C is satisfied.

4. 4. The stator according to claim 1, wherein the axial dimension of the insulating paper is A mm, the axial dimension of the wall portion of one of the insulating members is B mm, and the axial dimension of the stator body is C mm, satisfying the relationship B-(C-A)≧2.4 mm.

5. The stator according to claim 1 , wherein the insulating member is made of a synthetic resin.

6. The stator according to claim 1 , wherein the insulating paper is arranged along the side surface and the circumferential surface against its own elastic force.

7. the insulating paper is disposed on the side surfaces of two of the core portions adjacent to each other in the circumferential direction and on the circumferential surface of the circumferential portion between the core portions; The insulating member is configured to be connected across the core portions and the periphery between the core portions. A stator according to any one of claims 1 to 6.

8. A stator according to any one of claims 1 to 7; a rotor that rotates when current is applied to the coil of the stator; A motor comprising:

9. a stator body made of a magnetic material having a core portion around which a coil is wound and a circumferential portion connecting the core portion in a circumferential direction; an insulating paper sheet disposed along a side surface of the core portion and a peripheral surface of the peripheral portion that is continuous with the side surface; a pair of insulating members disposed to cover axial end faces of the stator body, each having a wall portion that hangs over axial ends of the side face and the peripheral surface, the wall portion having a constant thickness over the entire axial length of the wall portion; Equipped with an axial end of the insulating paper is disposed between the wall portion and the side surface and the peripheral surface; the insulating member is made of an elastic material, and generates an elastic force at the wall portion pressing the side surface of the core portion and the peripheral surface of the peripheral portion, thereby acting as a transition fit or an interference fit with the axial end portions of the stator body and the insulating paper; A method of manufacturing a stator in which the stator body and the insulating member are combined with each other by generating a frictional force via the insulating paper, a step of disposing one axial end of the insulating paper between the wall portion of one of the insulating members and the side surface and the peripheral surface; a step of placing the other insulating member on the stator body so that the other axial end of the insulating paper is positioned between the wall portion of the other insulating member and the side surface and the circumferential surface; winding the coil around the core from above each of the insulating members and the insulating paper; A method for manufacturing a stator, comprising:

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