Stator, electric motor, and application device

Abstract

To provide a stator in which attachment of an insulating sheet to a core is facilitated enabling automation using a machine.SOLUTION: An insulating sheet that is included in a stator and insulates between a core and a coil has: a tooth insulating portion that covers a side surface of a tooth in parallel with an axial direction of a yoke; a yoke insulating portion that has one end connected to an outer end of the tooth insulating portion in a radial direction toward an axis of the yoke and covers an inner surface of a yoke portion; a pair of extension portions that extend respectively to one side and the other side in the axial direction from the yoke insulating portion; and a bent portion that extends from the extension portion, is bent outwardly in the radial direction, and is fitted into a recess of an insulator. The bent portion extends from the extension portion to a direction away from the tooth in an intersecting direction with respect to the axial direction and the radial direction, and is bent from the extension portion in such a way that a leading end is located radially outside a base end in the intersecting direction. The recess of the insulator is formed by a locking surface that locks the leading end of the bent portion in the intersecting direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to stators, electric motors and applications. [Background technology]

[0002] A known conventional stator is the armature described in Patent Document 1. This armature has a pair of insulating slot cells attached to both sides of the teeth of the armature core, and then the upper parts of the slot cells are fixed by upper bobbins that cover the top surfaces of the teeth, and the lower parts of the slot cells are fixed by lower bobbins that cover the bottom surfaces of the teeth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-78121 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the armature of Patent Document 1, the pair of slot cells must be kept in contact with the teeth, and the ends of the slot cells must be inserted into the bobbin to fix the slot cells in place. Therefore, the process of attaching such slot cells to the armature is complicated and difficult even when done manually, and it is even more difficult to automate this process using a machine.

[0005] Therefore, an object of the present disclosure is to provide a stator, an electric motor, and an applied device that can facilitate the attachment of an insulating sheet to a core, thereby enabling automation by machine. [Means for solving the problem]

[0006] A stator according to one aspect of the present disclosure comprises a cylindrical yoke having a plurality of connected yoke portions, a core having teeth extending radially inward from the inner surface of the yoke portion toward the axis of the yoke, a coil with wire wound around the teeth, a pair of insulators covering both end faces of the core in the axial direction parallel to the axis, and an insulating sheet providing insulation between the core and the coil, wherein the insulating sheet has tooth insulating portions covering the side faces of the teeth parallel to the axial direction, a yoke insulating portion having one end connected to the outer end of the tooth insulating portion in the radial direction and covering the inner surface of the yoke portion, a pair of extension portions extending from the yoke insulating portion to one side and the other in the axial direction, and a bending portion extending from the extension portion and bending outward opposite to the radial inward direction, and the insulator has a recess recessed from its inner surface into which the bending portion is fitted. [Effects of the Invention]

[0007] According to each aspect of the present disclosure, the attachment of the insulating sheet to the core can be facilitated, making it possible to automate the process using a machine. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a stator according to a first embodiment of the present disclosure. [Figure 2] 1 is a top view of an electric motor including a stator; [Figure 3] FIG. 2 is a perspective view of a stator, an insulator, and an insulating sheet. [Figure 4A] FIG. [Figure 4B] This is a view of the upper insulator from below. [Figure 5] 1A and 1B are a top view and a radially inner view of an insulating sheet, respectively; [Figure 6A] FIG. 10 is a diagram showing an insulating sheet fitted into a second recess. [Figure 6B] FIG. 10 is a diagram showing an insulating sheet pressed against the side surface of a tooth. [Figure 7A]FIG. 10 is a diagram showing an insulating sheet pressed against the inner surface of the yoke portion. [Figure 7B] 10 is a diagram showing the bent portion of the insulating sheet fitted into the first recess. FIG. [Figure 8A] FIG. 10 is a diagram showing a state in which a wire is wound around the teeth and tooth insulating portions to which insulating sheets are attached. [Figure 8B] FIG. 10 is a diagram showing a coil covered with a coil insulating portion of an insulating sheet. [Figure 9] FIG. 10 is a perspective view showing an insulating sheet attached to the core and the insulator. [Figure 10] FIG. 10 is a perspective view showing a state in which a wire is wound around the teeth and tooth insulating portions to which insulating sheets are attached. [Figure 11] FIG. 10 is a schematic diagram showing an application device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) <Stator> As shown in the example of FIGS. 1 and 2 , the stator 10 according to the first embodiment of the present disclosure includes a core 18, a coil 13, and an insulator 30. The core 18 has a cylindrical yoke 11. The axial direction parallel to the axis 11a of the yoke 11 is referred to as the up-down direction. In the radial direction centered on the axis 11a of the yoke 11, the direction toward the axis 11a is referred to as the inward direction, and the opposite direction is referred to as the outward direction. The direction intersecting the axial and radial directions is referred to as the left-right direction. However, the arrangement of the stator 10 is not limited to this.

[0010] The stator 10 is formed of a plurality of segments 12 (nine in the example of FIG. 1). Each segment 12 includes a core portion 20 including a yoke portion 21 and teeth 22 (FIG. 8A), coils 13 in which wires 13a (FIG. 8A) are wound around the teeth 22, and a pair of insulators 30 covering the upper and lower ends of the core portion 20 in the vertical direction. The yoke portion 21 has a cross section perpendicular to the axial direction that is generally arc-shaped. One side surface in the left-right direction is provided with a protrusion 25 extending in the vertical direction from the upper end to the other end of the side surface, and the other side surface is provided with a recess 26 extending in the vertical direction from the upper end to the other end of the side surface. The nine yoke portions 21 are arranged to form a cylindrical yoke 11 so that the recess 26 of one adjacent yoke portion 21 fits into the protrusion 25 of the other yoke portion 21. The stator 10 is then formed by fixing the yoke portions 21 adjacent to each other in the circumferential direction by welding or the like. In this stator 10, nine core portions 20 are connected to form an annular core 18, and the yoke portion 21 of the core portion 20 constitutes the yoke 11.

[0011] <Core part> As shown in the example of Figure 3, the core portion 20 of the segment 12 is made up of multiple steel plates stacked in the vertical direction and fixed by caulking. The core portion 20 has a yoke portion 21, teeth 22, and a wide portion 23. The core portion 20 has an upper surface and a lower surface that are end faces that intersect (e.g., are perpendicular to) the vertical direction. Mounting holes 24 are provided on each of the upper and lower surfaces. The core portion 20 has a shape that is symmetrical with respect to a center line extending in the radial direction, except for protrusions 25 and depressions 26.

[0012] The yoke portion 21 has an outer surface and an inner surface that intersect (e.g., perpendicular to) the radial direction. For example, the outer surface is curved in a substantially arc-like shape in the left-right direction and extends linearly in the up-down direction, while the inner surface is flat and parallel to the up-down and left-right directions. Furthermore, the yoke portion 21 has a right side surface and a left side surface that intersect with the left-right direction. A protrusion 25 is provided on the right side surface, and a recess 26 is provided on the left side surface.

[0013] Teeth 22 are disposed at the center of yoke portion 21 in the left-right direction and protrude radially inward from the inner surface of yoke portion 21. Therefore, the inner surface of yoke portion 21 has a right inner surface disposed to the right of teeth 22 and a left inner surface disposed to the left of teeth 22. Teeth 22 are, for example, rectangular parallelepiped-shaped and have right and left side surfaces that intersect (for example, perpendicular to) the left-right direction. The right and left side surfaces are, for example, planar.

[0014] The wide portions 23 are connected to the inner ends of the teeth 22. The width of the wide portions 23 in the left-right direction is wider than that of the teeth 22 but narrower than that of the yoke 11. The wide portions 23 have inner and outer surfaces that intersect (e.g., perpendicular to) the radial direction, and side surfaces that intersect the left-right direction and connect the inner and outer surfaces. The inner surfaces are curved in a generally arc-like shape in the left-right direction and linearly extend in the up-down direction. The outer surfaces are flat and inclined radially inward relative to the direction away from the teeth 22 in the left-right direction. These outer surfaces have a right outer surface located to the right of the teeth 22 and a left outer surface located to the left of the teeth 22, and face the inner surfaces of the yoke portion 21 in the radial direction. The space surrounded by the right outer surface of the wide portions 23, the right side surfaces of the teeth 22, and the right inner surface of the yoke portion 21 is used as a right slot 27. The space surrounded by the left outer surface of the wide portion 23, the left side surface of the tooth 22, and the left inner surface of the yoke portion 21 is used as the left slot 27. The coil 13 (FIG. 8A) in which the wire 13a (FIG. 8A) is wound around the tooth 22 is housed in the right slot 27 and the left slot 27.

[0015] <Insulator> 3 to 4B, the insulator 30 is made of an electrically insulating resin or the like, and has an upper insulator 30 attached to the upper surface of the core portion 20, and a lower insulator 30 attached to the lower surface of the core portion 20. A protrusion 35 is provided on each of the lower surface of the upper insulator 30 and the upper surface of the lower insulator 30. The insulator 30 is attached to the core portion 20 by inserting the protrusion 35 into the attachment hole 24 of the core portion 20.

[0016] The insulator 30 has a yoke covering portion 31, a tooth covering portion 32, a wide covering portion 33, and a protrusion 34. The yoke covering portion 31 of the upper insulator 30 has an introduction port 36 through which the wire 13a of the coil 13 is introduced. Except for this introduction port 36, the upper insulator 30 has a shape symmetrical with respect to a center line extending in the radial direction. The lower insulator 30 has a shape symmetrical with respect to a center line extending in the radial direction.

[0017] The yoke covering portion 31 of the upper insulator 30 covers the upper surface of the yoke portion 21, and the yoke covering portion 31 of the lower insulator 30 covers the lower surface of the yoke portion 21. The inner surface of the yoke covering portion 31 is flat and is provided with a first recess 37 that is recessed radially outward from the inner surface. The upper yoke covering portion 31 and the lower yoke covering portion 31 each have a first recess 37 to the right of the tooth covering portion 32 and a first recess 37 to the left of the tooth covering portion 32 in the left-right direction. The upper first recess 37 extends in the vertical direction and opens at the lower surface of the yoke covering portion 31, and the lower first recess 37 extends in the vertical direction and opens at the upper surface of the yoke covering portion 31.

[0018] The first recess 37 does not penetrate the yoke covering portion 31 in the radial direction, but is formed by a first inclined surface 37a and a first locking surface 37b of the yoke covering portion 31. The angle between the first inclined surface 37a and the first locking surface 37b is less than 90 degrees, for example, 45 degrees or less. The first inclined surface 37a of the first recess 37 is planar and inclined at a certain angle relative to the inner surface of the yoke covering portion 31, and the first locking surface 37b slopes radially outward from the inner surface of the yoke covering portion 31 as it extends away from the tooth covering portion 32 in the left-right direction. The first locking surface 37b of the first recess 37 extends from the end of the first inclined surface 37a that is farthest from the tooth covering portion 32 in the left-right direction to the inner surface of the yoke covering portion 31 so as to form an acute angle with the first inclined surface 37a, e.g., radially inward or perpendicular to the left-right direction.

[0019] 3, the first recess 37 has a triangular cross section in the vertical direction, but the shape is not limited to this as long as it is formed by the first locking surface 37b. For example, the first recess 37 may have a rectangular cross section in the vertical direction. In this case, among the surfaces forming the first recess 37, a surface that intersects with the left-right direction and is away from the tooth covering portion 32 may be used as the first locking surface 37b.

[0020] The tooth covering portions 32 of the upper insulator 30 cover the upper surfaces of the teeth 22, and the tooth covering portions 32 of the lower insulator 30 cover the lower surfaces of the teeth 22. The tooth covering portions 32 protrude radially inward from the inner surface of the yoke covering portion 31 at the center of the yoke covering portion 31 in the left-right direction.

[0021] The wide covering portion 33 of the upper insulator 30 covers the upper surface of the wide portion 23, and the wide covering portion 33 of the lower insulator 30 covers the lower surface of the wide portion 23. The inner surface of the wide covering portion 33 is curved in an arc shape in the left-right direction. The outer surface of the wide covering portion 33 is flat and intersects (e.g., perpendicular to) the side surfaces (right and left surfaces) of the tooth covering portion 32. The upper second recess 38 and the lower second recess 38 each have a right second recess 38 located to the right of the tooth covering portion 32 and a left second recess 38 located to the left of the tooth covering portion 32 in the left-right direction. The wide covering portion 33 is provided with an upper second recess 38 that is recessed radially inward from the outer surface. The upper second recess 38 extends in the vertical direction and opens at the lower surface of the wide covering portion 33, and the lower second recess 38 extends in the vertical direction and opens at the upper surface of the wide covering portion 33.

[0022] The second recess 38 does not penetrate the wide covering portion 33 in the radial direction, but is formed by the second inclined surface 38a and the second locking surface 38b of the wide covering portion 33. The angle between the second inclined surface 38a and the second locking surface 38b is less than 90 degrees, e.g., 45 degrees or less. The second inclined surface 38a of the second recess 38 is planar and inclined at a certain angle relative to the outer surface of the wide covering portion 33, and is inclined radially inward as it extends away from the outer surface of the wide covering portion 33 in the left-right direction from the tooth covering portion 32. The second locking surface 38b of the second recess 38 extends from the end of the second inclined surface 38a away from the tooth covering portion 32 in the left-right direction to the outer surface of the wide covering portion 33 so as to form an acute angle with the second inclined surface 38a, e.g., radially inward or perpendicular to the left-right direction.

[0023] The protrusion 34 has an upper protrusion 34 that protrudes downward from the upper wide covering portion 33, and a lower protrusion 34 that protrudes upward from the lower wide covering portion 33. Each of the upper protrusion 34 and the lower protrusion 34 has a right protrusion 34 that protrudes from the wide covering portion 33 along the right end of the wide portion 23, and a left protrusion 34 that protrudes from the wide covering portion 33 along the left end of the wide portion 23. The right protrusion 34 extends to extend the right side between the second locking surface 38b of the second recess 38 and the right side surface of the wide covering portion 33. The left protrusion 34 extends to extend the left side between the second locking surface 38b of the second recess 38 and the left side surface of the wide covering portion 33. Therefore, the protrusion 34 has a second locking extension surface 34a that extends the second locking surface 38b.

[0024] 3 and 4B , when insulator 30 is attached to core portion 20, the inner surface of yoke covering portion 31 is flush with and extends the inner surface of yoke portion 21, thereby forming, together with the inner surface of yoke portion 21, the outer surface of slot 27. Furthermore, upper yoke covering portion 31 covers the top surface of yoke portion 21, and the opening below first recess 37 in upper yoke covering portion 31 is closed by the top surface of yoke portion 21. Lower yoke covering portion 31 covers the bottom surface of yoke portion 21, and the opening above first recess 37 in lower yoke covering portion 31 is closed by the bottom surface of yoke portion 21. Furthermore, side surfaces of tooth covering portion 32 are flush with and extend the side surfaces of teeth 22, thereby forming, together with the side surfaces of teeth 22, the outer surface of slot 27.

[0025] The inner surface of the wide covering portion 33 is flush with and extends the inner surface of the wide portion 23. The second inclined surface 38a of the wide covering portion 33 is flush with and extends the outer surface of the wide portion 23, and together with the outer surface of the wide portion 23, forms the inner surface of the slot 27. The upper protrusion 34 extends downward from the upper end of the wide portion 23 to cover the upper part of the side surface of the wide portion 23. The lower protrusion 34 extends upward from the lower end of the wide portion 23 of the core portion 20 to cover the lower part of the side surface of the wide portion 23. This leaves a gap between the upper protrusion 34 and the lower protrusion 34, exposing the side surface of the wide portion 23. The protrusion 34 protrudes radially outward from the outer surface of the wide portion 23. A third recess 39 is formed between the outer surface of the wide portion 23 and the second locking extension surface 34 a of the protrusion 34 , and this third recess 39 is connected to the second recess 38 of the wide covering portion 33 .

[0026] <Insulation sheet> FIG. 5 shows the insulating sheet 40 as viewed from above and as viewed from the radially inner side. FIG. 5(a) is a view of the insulating sheet 40 as viewed from above, and FIG. 5(b) is a view of the insulating sheet 40 as viewed from the radially inner side. As shown in the examples of FIGS. 3 and 5, the insulating sheet 40 is made of an electrically insulating resin or the like, is a thin sheet, and is elastic and flexible. The insulating sheet 40 electrically insulates between the core portion 20 and the coil 13 (FIG. 8A) and between the coils 13 (FIG. 2) of two adjacent core portions 20. Two such insulating sheets 40 are attached to one core portion 20. Specifically, a right insulating sheet 40 is attached to the right slot 27 of one core portion 20, and a left insulating sheet 40 is attached to the left slot 27. The right insulating sheet 40 and the left insulating sheet 40 have shapes that are symmetrical with respect to a plane that includes the center line of the teeth 22 extending radially and is perpendicular to the left-right direction. Therefore, the right insulating sheet 40 and the left insulating sheet 40 have the same shape when viewed individually. The right insulating sheet 40 will be described below as a representative example.

[0027] The insulating sheet 40 has a symmetrical shape with respect to a plane perpendicular to the vertical direction. The insulating sheet 40 has a coil insulating portion 41, a yoke insulating portion 42, a tooth insulating portion 43, a wide insulating portion 44, and an extended insulating portion 45. The coil insulating portion 41, the yoke insulating portion 42, the tooth insulating portion 43, the wide insulating portion 44, and the extended insulating portion 45 are arranged in this order and integrally formed. The insulating sheet 40 is formed, for example, by cutting and folding a single sheet. Between each of the coil insulating portion 41, the yoke insulating portion 42, the tooth insulating portion 43, and the wide insulating portion 44, folds extending in the vertical direction are provided.

[0028] The coil insulating part 41 is rectangular and is longer in the vertical direction than the core portion 20. The left end of the coil insulating part 41 is connected to the right end of the yoke insulating part 42, and a fold 41a is provided between the coil insulating part 41 and the yoke insulating part 42, extending in the vertical direction so as to extend in a straight line diagonally outward to the right from the right end of the yoke insulating part 42. When viewed from above, the central angle of an arc extending from the outer surface of the yoke insulating part 42 to the outer surface of the coil insulating part 41, centered on the fold 41a, is 90 degrees or greater.

[0029] Yoke insulating portion 42 is rectangular and extends in the left-right direction. Its vertical length is equal to or greater than the length of yoke portion 21, and its horizontal length is equal to or slightly greater than the length of yoke portion 21, so as to cover the entire inner surface of yoke portion 21. Furthermore, since the vertical length of yoke portion 21 is less than the distance between the upper first recess 37 and the lower first recess 37 in segment 12 having insulator 30 attached to core portion 20, yoke insulating portion 42 does not cover first recess 37. The left end of yoke insulating portion 42 is connected to the outer end of tooth insulating portion 43, and extends to the right from the outer end of tooth insulating portion 43. When viewed from above, the central angle of a circular arc extending from the right surface of tooth insulating portion 43 to the inner surface of yoke insulating portion 42, centered on the fold between yoke insulating portion 42 and tooth insulating portion 43, is, for example, 90 degrees or slightly greater. An upper extension 46 is provided at the upper end of the yoke insulating part 42, and a lower extension 46 is provided at the lower end of the yoke insulating part 42.

[0030] The upper extension 46 extends upward from the upper end of the yoke insulating part 42, and the lower extension 46 extends downward from the lower end of the yoke insulating part 42. The upper extension 46 and the lower extension 46 each have a width in the left-right direction narrower than that of the yoke insulating part 42, and are positioned closer to the left end of the yoke insulating part 42 than to the right end. The extension 46 is, for example, trapezoidal in shape, and the width in the left-right direction increases the closer it is to the end of the yoke insulating part 42 in the up-down direction. This allows each extension 46 to have a wide connection with the yoke insulating part 42, preventing it from coming off the yoke insulating part 42.

[0031] The upper extension 46 has a notch formed at its left end, which slopes diagonally upward to the right from the upper end of the yoke insulating part 42. The lower extension 46 has a notch formed at its left end, which slopes diagonally downward to the right from the lower end of the yoke insulating part 42. This notch prevents the introduction port 36 of the yoke covering part 31 from being blocked by the yoke insulating part 42, making it easier for the wire 13a of the coil 13 to be introduced into the slot 27 from the introduction port 36, as shown in the examples of FIGS. 9 and 10 . Furthermore, as shown in the examples of FIGS. 3 and 5 , an upper bent part 47 is connected to the upper extension 46, and a lower bent part 47 is connected to the lower extension 46. A vertically divided space is formed between the lower end of the upper bent part 47 and the upper end of the yoke insulating part 42, and a vertically divided space is also formed between the upper end of the lower bent part 47 and the lower end of the yoke insulating part 42.

[0032] The bent portion 47 is rectangular, its left end connected to the right end of the extended portion 46, and extends from the extended portion 46 and bends radially outward. The bent portion 47 extends from the extended portion 46 in a direction away from the tooth insulating portion 43 in the left-right direction and is bent from the extended portion 46 so that its right end, which is the tip end, is positioned radially outward relative to its left end, which is the base end in the left-right direction. This creates a fold that extends vertically between the extended portion 46 and the bent portion 47. When viewed from above, the central angle of an arc extending from the outer surface of the extended portion 46 to the outer surface of the bent portion 47, centered on the fold between the extended portion 46 and the bent portion 47, is, for example, 90 degrees or greater. In the left-right direction, the right end 47a of the bent portion 47 is located to the left of the right end of the yoke insulating portion 42. Therefore, as shown in the examples of Figures 9 and 10, the extension portion 46 is positioned on the inner surface of the yoke insulating portion 42 to the left of the first recess 37, the bent portion 47 is fitted into the first recess 37, and the right end of the bent portion 47 is engaged with the first engagement surface 37b.

[0033] 3 and 5, tooth insulating portions 43 are rectangular and extend radially, covering the entire side surfaces of teeth 22 parallel to the up-down direction, with their vertical length being equal to or greater than the length of teeth 22 and their radial length being equal to or substantially equal to the length of teeth 22. The inner ends of tooth insulating portions 43 are connected to the left ends of wide insulating portions 44. When viewed from above, the central angle of an arc extending from the outer surface of wide insulating portion 44 to the right surface of tooth insulating portion 43, centered on the fold between wide insulating portion 44 and tooth insulating portion 43, is, for example, slightly larger than 90 degrees.

[0034] The wide insulating portion 44 is rectangular, and its length in the up-down direction is equal to or greater than the length of the wide portion 23 so as to cover the entire outer surface of the wide portion 23. The wide insulating portion 44 has a left end connected to the inner end of the tooth insulating portion 43 and slopes inward from the inner end of the tooth insulating portion 43 to the right. The right end 44a of the wide insulating portion 44 is farther from the tooth insulating portion 43 than the left end in the left-right direction, and is an engaging end that engages with the protrusion 34 of the insulator 30.

[0035] The left end of the extended insulating portion 45 is connected to the right end of the wide insulating portion 44. The extended insulating portion 45 slopes inward from the right end 44a of the wide insulating portion 44 to the right, extending the wide insulating portion 44. Therefore, no fold is formed between the extended insulating portion 45 and the wide insulating portion 44. The extended insulating portion 45 has a notch, and its length in the vertical direction is shorter than that of the wide insulating portion 44. The extended insulating portion 45 is positioned in the vertical center of the wide insulating portion 44, and the right end 44a of the wide insulating portion 44 extends above and below the extended insulating portion 45. Therefore, the notches in the extended insulating portion 45 are located at the upper and lower ends of the extended insulating portion 45. As shown in the examples of Figures 9 and 10, the length of the extended insulating portion 45 in the vertical direction is equal to or slightly shorter than the distance between the lower end of the upper protrusion 34 and the upper end of the lower protrusion 34. The protruding portion 34 fits into the notch of the extended insulating portion 45, and the extended insulating portion 45 protrudes to the right from between the upper protruding portion 34 and the lower protruding portion 34.

[0036] <How to make a stator> As shown in the example of Fig. 3, the protrusions 35 of the upper insulator 30 are inserted into the mounting holes 24 on the top surface of the core portion 20, and the protrusions 35 of the lower insulator 30 are inserted into the mounting holes 24 on the bottom surface of the core portion 20, thereby attaching the upper insulator 30 and the lower insulator 30 to the core portion 20. Then, as shown in the example of Fig. 6A, the extended insulating portion 45 is inserted between the upper protrusion 34 and the lower protrusion 34. As a result, the upper end of the extended insulating portion 45 is engaged with the lower end of the upper protrusion 34, and the lower end of the extended insulating portion 45 is engaged with the upper end of the upper protrusion 34, so that the insulating sheet 40 is positioned in the up-down direction relative to the core portion 20.

[0037] Next, the right end 44a of the wide insulating portion 44 of the insulating sheet 40 is inserted into the second recess 38 and the third recess 39, and then pressed against the outer surface of the wide portion 23. At this time, the right end 44a of the wide insulating portion 44 is engaged with the second engaging surface 38b and the second engaging extension surface 34a as an engaging end, and the wide insulating portion 44 rotates inward around the right end 44a of the wide insulating portion 44, so that the outer surface of the wide portion 23 can be easily covered with the wide insulating portion 44.

[0038] 6B, tooth insulating portions 43 are pressed against the side surfaces of teeth 22. At this time, the fold between wide insulating portion 44 and tooth insulating portion 43 fits into the corner between wide portion 23 and tooth 22. Tooth insulating portion 43 rotates to the left around the inner end of tooth insulating portion 43 that forms this fold, allowing tooth insulating portion 43 to easily cover the side surfaces of teeth 22.

[0039] Next, as shown in the example of FIG. 7A , yoke insulating portion 42 is pressed against the inner surface of yoke portion 21. At this time, the fold between tooth insulating portion 43 and yoke insulating portion 42 fits into the corner between tooth 22 and yoke portion 21. Because yoke insulating portion 42 rotates outward around the left end of yoke insulating portion 42 that forms this fold, yoke insulating portion 42 can easily cover the inner surface of yoke portion 21. Yoke insulating portion 42 and wide insulating portion 44 are disposed radially with tooth insulating portion 43 sandwiched therebetween and are supported radially by yoke portion 21 and wide portion 23, so that insulating sheet 40 is held to core portion 20 in the radial direction with radial movement restricted.

[0040] As shown in the example of FIG. 7B , the yoke insulating part 42 is connected to the upper bent part 47 via the upper extension part 46 and to the lower bent part 47 via the lower extension part 46. Therefore, the upper bent part 47 and the lower bent part 47 move outward together with the yoke insulating part 42. Here, the upper first recess 37 is positioned outward of the upper bent part 47 and faces the upper bent part 47. The lower first recess 37 is positioned outward of the lower bent part 47 and faces the lower bent part 47. The bent part 47 is bent radially outward more than the yoke insulating part 42. Therefore, as the yoke insulating part 42 rotates, the bent part 47 is inserted into the first recess 37. The bent part 47 extends diagonally outward to the right along the first inclined surface 37a, and the right end 47a of the bent part 47 faces the first locking surface 37b as a locking end and is locked by the first locking surface 37b. By being locked by both the upper bent portion 47 and the lower bent portion 47 in this manner, the insulating sheet 40 is restricted from moving to the right and is held in the core portion 20 in the left-right direction. In this manner, the extended insulating portion 45 of the insulating sheet 40 is inserted between the upper protruding portion 34 and the lower protruding portion 34, and then the wide insulating portion 44, the tooth insulating portion 43, and the yoke insulating portion 42 are pressed against the core portion 20 in this order, thereby attaching the insulating sheet 40 to the core portion 20 of the core 18. This makes it possible to easily attach the insulating sheet 40 to the core portion 20 of the core 18 and automate the process by machine.

[0041] In this manner, the right insulating sheet 40 is fitted into the right slot 27 and attached to the core portion 20. Also, as shown in the example of FIG. 8A , the left insulating sheet 40 is fitted into the left slot 27 and attached to the core portion 20, similar to the right insulating sheet 40. The coil insulating portions 41 of these insulating sheets 40 are inclined radially outward relative to the yoke insulating portion 42. Furthermore, the first recesses 37 for fixing the insulating sheet 40 to the core portion 20 are recessed from the inner surface of the yoke covering portion 31, and the bent portions 47 are fitted into these first recesses 37, so they do not protrude from the inner surface of the yoke covering portion 31. This prevents the coil insulating portions 41 and the bent portions 47 from getting in the way of the wire 13a when it is wound around the teeth 22 and the tooth covering portions 32. Therefore, the wire 13a can be easily wound around the teeth 22 and the tooth covering portions 32 without being hindered by the coil insulating portions 41 and the bent portions 47. In addition, an insulating sheet 40 is sandwiched between the coil 13 around which the wire 13a is wound and the core portion 20 around the slot 27 in which the coil 13 is housed, and the core portion 20 and the coil 13 are electrically insulated by the insulating sheet 40.

[0042] Next, as shown in the example of FIG. 8B, the right coil insulating portion 41 and the left coil insulating portion 41 are bent inward so that the coil insulating portion 41 covers the coil 13. This forms the segment 12. In this way, as shown in the example of FIG. 1, the yoke portions 21 of nine segments 12 are fixed by welding or the like to produce the stator 10. In this stator 10, as shown in the example of FIG. 2, the coil insulating portion 41 is interposed between the coils 13 of adjacent segments 12, so that the coils 13 can be electrically insulated from each other.

[0043] (Embodiment 2) As shown in the example of FIG. 2 , electric motor 14 according to embodiment 2 of the present disclosure includes rotor 15 and housing 16 in addition to stator 10 according to embodiment 1. Housing 16 accommodates stator 10 and rotor 15 and is fixed to stator 10. Rotor 15 has a cylindrical rotating core 15a and a columnar rotating shaft 15b. Rotating core 15a is made of multiple steel plates stacked vertically and fixed by caulking, and a permanent magnet is embedded therein. Rotating shaft 15b is inserted into a central hole of rotating core 15a and fixed to rotating core 15a. Rotor 15 is disposed coaxially with stator 10 inside stator 10 and is supported by housing 16 via bearings so as to be rotatable relative to stator 10. The outer circumferential surface of rotor 15 faces the inner circumferential surface of stator 10 with a gap therebetween. An example of electric motor 14 is a motor. The stator 10 of the electric motor 14 can facilitate the attachment of the insulating sheet 40 to the core portion 20 of the core 18, allowing for automated mechanical installation. This allows for more efficient manufacturing of the electric motor 14.

[0044] (Embodiment 3) As shown in the example of FIG. 11 , applied device 17 according to embodiment 3 of the present disclosure includes electric motor 14 and is driven by electric motor 14. One example of applied device 17 is a refrigerant compressor. This refrigerant compressor is provided in, for example, a refrigeration system or an air conditioning system. More specific examples of devices equipped with a refrigerant compressor include refrigerators, freezers, air conditioners, showcases, and vending machines. In addition to refrigerant compressors, other examples of applied device 17 include various devices such as fans, pumps, and drive sources for vehicles. Stator 10 of electric motor 14 in applied device 17 facilitates the attachment of insulating sheet 40 to core portion 20 of core 18, enabling automated mechanical production. This allows for more efficient manufacturing of applied device 17.

[0045] It should be noted that many modifications and other embodiments of the present disclosure will be apparent to those skilled in the art from the above description. Therefore, the above description should be construed as merely illustrative and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present disclosure. Details of the structure and / or function thereof may be substantially changed without departing from the spirit of the present disclosure.

[0046] (Other embodiments) (Addendum) The above description of the embodiments discloses the following techniques. The first technology is a stator comprising a cylindrical yoke in which a plurality of yoke portions are connected together, a core having teeth extending radially inward from the inner surface of the yoke portion toward the axis of the yoke, a coil in which wire is wound around the teeth, a pair of insulators covering both end faces of the core in the axial direction parallel to the axis, and an insulating sheet providing insulation between the core and the coil, wherein the insulating sheet has tooth insulating portions covering the side faces of the teeth parallel to the axial direction, a yoke insulating portion having one end connected to the outer end of the tooth insulating portion in the radial direction and covering the inner surface of the yoke portion, a pair of extension portions extending from the yoke insulating portions to one side and the other in the axial direction, and bent portions extending from the extension portions and bending outward opposite to the radial inward direction, wherein the insulator has a recess recessed from its inner surface into which the bent portion is fitted.

[0047] According to this configuration, after the insulator is attached to the core, the insulating sheet is attached to the core and the insulator by fitting the bent portion of the insulating sheet into the recess recessed from the inner surface of the insulator. This makes it easy to attach the insulating sheet to the core and enables automation by machine. In addition, because the recess and bent portion do not protrude from the inner surface of the insulator, it is easy to wind the wire around the teeth.

[0048] A second technology is the stator according to the first technology, in which the bent portion extends from the extension portion in a direction away from the tooth in a transverse direction intersecting the axial direction and the radial direction, and is bent from the extension portion so that its tip is positioned radially outward relative to its base end in the transverse direction, and the recess is formed by a locking surface that locks the tip of the bent portion in the transverse direction. With this configuration, the tip of the bent portion is locked onto the locking surface, preventing the insulating sheet from separating from the core teeth. This facilitates attachment of the insulating sheet to the core, enabling automated installation. Furthermore, wire can be easily wound around the teeth without using a jig to secure the insulating sheet to the core.

[0049] A third technology is the stator according to the first or second technology, wherein the recesses are formed by inclined surfaces that slope from the inner surface of the insulator so as to slope radially outward as they move away from the teeth in a direction intersecting the axial direction and the radial direction. This configuration ensures the thickness of the insulator in the radial direction while providing the insulator with recesses into which the bent portions are fitted. This reduces the reduction in strength of the insulator due to the recesses.

[0050] A fourth technology is a stator according to any one of the first to third technologies, wherein the core has a wide portion that is arranged to sandwich the teeth between itself and the yoke portion in the radial direction and is wider than the width of the teeth in a transverse direction that intersects the axial direction and the radial direction, the insulator has a wide covering portion that covers an end face of the wide portion, and a protrusion that protrudes from the wide covering portion along the end of the wide portion in the transverse direction, the insulating sheet has a wide insulating portion that is connected at one end to an inner end of the tooth insulating portion in the radial direction and covers an outer surface of the wide portion, and the wide insulating portion has a locking end that is away from the tooth insulating portion in a transverse direction that intersects the axial direction and the radial direction and is locked to the protrusion.

[0051] According to this configuration, the locking end of the wide insulating portion is locked onto the protruding portion, and the wide insulating portion is rotated around this locking end and pressed against the wide portion. Furthermore, the tooth insulating portion is rotated around the inner end of the tooth insulating portion connected to the wide insulating portion and pressed against the teeth. Furthermore, the yoke insulating portion is rotated around the outer end of the tooth insulating portion and pressed against the yoke portion. In this way, by pressing the insulating sheet against the wide portion, teeth, and yoke portions of the core in this order, the core can be covered with the insulating sheet, which facilitates attachment of the insulating sheet to the core and enables automation by machine.

[0052] A fifth technology is the stator according to the fourth technology, in which the wide insulating portion has an extended insulating portion extending from the locking end in a direction intersecting the axial direction, and the extended insulating portion protrudes from between the pair of protrusions in the axial direction. With this configuration, by having the extended insulating portion protrude between the pair of protrusions, the extended insulating portion is locked by the pair of protrusions in the axial direction, allowing the insulating sheet to be positioned on the core in the axial direction. This makes it easier to attach the insulating sheet to the core, enabling automation by machine.

[0053] A sixth technology is a stator in any one of the first to fifth technologies, in which the insulating sheet has a coil insulating portion that covers the coil and is connected to one end of the yoke insulating portion that is farther from the teeth than one end of the yoke insulating portion in a transverse direction that intersects the axial direction and the radial direction, and a fold that extends in the axial direction between the yoke insulating portion and the coil insulating portion.

[0054] With this configuration, when winding wire around the teeth with the insulating sheet attached, if the coil insulating portion is bent radially outward relative to the yoke insulating portion at the fold of the insulating sheet, the wire is less likely to come into contact with the coil insulating portion, making it easier to wind wire around the teeth and enabling automated assembly of the stator.

[0055] A seventh technology is the stator according to any one of the first to sixth technologies, wherein the insulating sheet has a shape symmetrical about a plane perpendicular to the axial direction. According to this configuration, one type of insulating sheet is attached to each of one side and the other side of the teeth in the intersecting direction by flipping it over about the plane perpendicular to the axial direction. This eliminates the need to use separate insulating sheets for one side and the other side of the teeth, and allows the number of types of insulating sheets to be limited to one, thereby reducing the cost of the stator.

[0056] An eighth technology is an electric motor equipped with any one of the stators of the first to seventh technologies. This configuration facilitates the attachment of an insulating sheet to the core of the stator of the electric motor, enabling automated mechanical installation. This improves the efficiency of manufacturing electric motors equipped with this stator.

[0057] The ninth technology is an applied device equipped with the electric motor of the eighth technology. This configuration makes it possible to easily attach an insulating sheet to the core of the stator of the applied device, enabling automation by machine. This makes it possible to improve the efficiency of manufacturing applied devices equipped with this stator. [Explanation of symbols]

[0058] 10: Stator 11: York 11a: Axis 13: Coil 13a: Wire 14:Electric motor 17: Application equipment 18: Core 21: Yoke part 22: Teeth 23: Wide part 30: Insulator 33: Wide covering section 34:Protrusion 37: First recess (recess) 37a: 1st slope (slope) 37b: First locking surface (locking surface) 40: Insulation sheet 41: Coil insulation 41a: Fold 42: Yoke insulation part 43: Teeth insulation part 44: Wide insulating section 44a: Right end (locking end) 45: Extension insulation section 46 :Extension part 47: Bent section

Claims

1. a core having a cylindrical yoke formed by connecting a plurality of yoke sections and teeth extending radially inward from the inner surfaces of the yoke sections toward the axis of the yoke; a coil in which a wire is wound around the teeth; a pair of insulators covering both end faces of the core in an axial direction parallel to the axis; an insulating sheet for insulating between the core and the coil, The insulating sheet is a tooth insulating portion covering a side surface of the tooth parallel to the axial direction; a yoke insulating portion having one end connected to an outer end of the tooth insulating portion in the radial direction and covering an inner surface of the yoke portion; a pair of extension portions extending from the yoke insulating portion to one side and the other side in the axial direction without any crease; a bending portion extending from the extension portion and bending outward in the radial direction opposite to the inward direction, The insulator has a recess recessed from its inner surface and into which the bent portion is fitted. stator.

2. a core having a cylindrical yoke formed by connecting a plurality of yoke sections and teeth extending radially inward from the inner surfaces of the yoke sections toward the axis of the yoke; a coil in which a wire is wound around the teeth; a pair of insulators covering both end faces of the core in an axial direction parallel to the axis; an insulating sheet for insulating between the core and the coil, The insulating sheet is a tooth insulating portion covering a side surface of the tooth parallel to the axial direction; a yoke insulating portion having one end connected to an outer end of the tooth insulating portion in the radial direction and covering an inner surface of the yoke portion; a pair of extension portions extending from the yoke insulating portion in one direction and the other direction in the axial direction, respectively; a bending portion extending from the extension portion and bending outward in the radial direction opposite to the inward direction, a space is formed between the yoke insulating portion and the bent portion; The insulator has a recess recessed from its inner surface and into which the bent portion is fitted. stator.

3. a core having a cylindrical yoke formed by connecting a plurality of yoke sections and teeth extending radially inward from the inner surfaces of the yoke sections toward the axis of the yoke; a coil in which a wire is wound around the teeth; a pair of insulators covering both end faces of the core in an axial direction parallel to the axis; an insulating sheet for insulating between the core and the coil, The insulating sheet is a tooth insulating portion covering a side surface of the tooth parallel to the axial direction; a yoke insulating portion having one end connected to an outer end of the tooth insulating portion in the radial direction and covering an inner surface of the yoke portion; a pair of extension portions extending from the yoke insulating portion in one direction and the other direction in the axial direction, respectively; a bending portion extending from the extension portion and bending outward in the radial direction opposite to the inward direction, the insulator has a recess recessed from its inner surface and into which the bent portion is fitted, the bent portion extends from the extended portion in a direction away from the tooth in a transverse direction intersecting the axial direction and the radial direction, and is bent from the extended portion so that a tip end thereof is positioned more outward in the radial direction than a base end thereof in the transverse direction, The recess is formed by a locking surface that locks a tip end of the bent portion in the cross direction. stator.

4. a core having a cylindrical yoke formed by connecting a plurality of yoke sections and teeth extending radially inward from the inner surfaces of the yoke sections toward the axis of the yoke; a coil in which a wire is wound around the teeth; a pair of insulators covering both end faces of the core in an axial direction parallel to the axis; an insulating sheet for insulating between the core and the coil, The insulating sheet is a tooth insulating portion covering a side surface of the tooth parallel to the axial direction; a yoke insulating portion having one end connected to an outer end of the tooth insulating portion in the radial direction and covering an inner surface of the yoke portion; a pair of extension portions extending from the yoke insulating portion in one direction and the other direction in the axial direction, respectively; a bending portion extending from the extension portion and bending outward in the radial direction opposite to the inward direction, The insulator has a recess recessed from its inner surface and into which the bent portion is fitted. stator.

5. the bent portion extends from the extended portion in a direction away from the tooth in a transverse direction intersecting the axial direction and the radial direction, and is bent from the extended portion so that a tip end thereof is positioned more outward in the radial direction than a base end thereof in the transverse direction, The recess is formed by a locking surface that locks a tip end of the bent portion in the cross direction. A stator according to any one of claims 2 to 4.

6. the recess is formed by an inclined surface inclined from an inner surface of the insulator so as to be inclined radially outward as it moves away from the tooth in an intersecting direction intersecting the axial direction and the radial direction, A stator according to any one of claims 1 to 4.

7. the core has a wide portion that is provided between the yoke portion and the teeth in the radial direction, and that is wider than the width of the teeth in a transverse direction that intersects with the axial direction and the radial direction, The insulator is a wide covering portion that covers an end surface of the wide portion; a protrusion protruding from the wide covering portion along an end of the wide portion in the cross direction, the insulating sheet has a wide insulating portion, one end of which is connected to an inner end of the tooth insulating portion in the radial direction and which covers an outer surface of the wide portion, the wide insulating portion has a locking end that is located at the other end away from the tooth insulating portion in a direction intersecting the axial direction and the radial direction and that is locked to the protrusion. A stator according to any one of claims 1 to 4.

8. the wide insulating portion has an extended insulating portion extending from the locking end in a direction intersecting the axial direction, The extended insulating portion protrudes from between the pair of protruding portions in the axial direction.

8. The stator according to claim 7.

9. The insulating sheet is a coil insulating portion that covers the coil and is connected to the other end of the yoke insulating portion that is farther from the teeth than the one end of the yoke insulating portion in a direction intersecting the axial direction and the radial direction; a fold extending in the axial direction between the yoke insulating portion and the coil insulating portion, A stator according to any one of claims 1 to 4.

10. The insulating sheet has a shape that is symmetrical with respect to a plane perpendicular to the axial direction. A stator according to any one of claims 1 to 4.

11. An electric motor comprising the stator according to any one of claims 1 to 4.

12. An application device comprising the electric motor according to claim 11.

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