Interphase Insulating Member, Stator, and Electric Motor

Abstract

To provide an interphase insulating member capable of improving the insulation properties of a stator.SOLUTION: A main body 110 includes a first body portion 111 and a second body portion 112 that are folded in a V-shape along an extending direction of a first folding line 100A. The first body portion 111 includes a first folded portion 120 (second folded portion 130) that is folded on the side opposite to the second body portion 112 on one side (the other side) along the extending direction of the first folding line 100A, along a second folding line 100B (third folding line 100C). The second body portion 112 includes a third folded portion 140 (fourth folded portion 150) that is folded to the side opposite to the first body portion 111 on one side (the other side) along the extending direction of the first folding line 100A, along a fourth folding line 100D (fifth folding line 100E). The first body portion 111 (second body portion 112) has an extension portion 111B (112B) on the side opposite to the first folding line 100A.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a technique for improving the insulation characteristics of a stator or an electric motor having an interphase insulating member.

Background Art

[0002] In order to improve the insulation characteristics, an interphase insulating member is disposed between stator windings wound around adjacent teeth of a stator core in a stator constituting an electric motor. For example, Patent Document 1 discloses an interphase insulating member in which a central portion of a strip shape is bent into a V shape, and bent portions extending in an L shape are provided on both sides of the V shape.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, for example, in electric vehicles, in order to reduce the size and increase the output of an electric motor, an increase in the drive voltage of the electric motor has been studied. Therefore, as part of the increase in the drive voltage of the electric conductor, there is a demand for the development of an interphase insulating member capable of further improving the insulation characteristics (increasing the insulation breakdown voltage) of the electric motor. The present invention has been conceived in view of such circumstances, and an object thereof is to provide a technique capable of improving the insulation characteristics of a stator or an electric motor having an interphase insulating member.

Means for Solving the Problems

[0005] A first invention relates to an interphase insulating member. The interphase insulating member of the present invention is disposed between stator windings wound around adjacent teeth. The phase insulation member of the present invention has a main body portion and first to fourth bending portions. The phase insulation member is formed of various known resin insulation films. The main body portion is formed by bending an insulation film including a first main body portion and a second main body portion in a V shape along a first bending line between the first main body portion and the second main body portion. The insulation film forming the main body portion 、Rectangular shape has (including "substantially rectangular shape"). Further, the first bending line 、Rectangular shape extends linearly (including "substantially linearly") at the center of the insulation film. The first bending portion and the second bending portion are provided on one side and the other side of the first main body portion along the extending direction of the first bending line. The first bending portion is bent to the side opposite to the second main body portion along the extending direction of a second bending line extending along a direction intersecting the extending direction of the first bending line. The second bending portion is bent to the side opposite to the second main body portion along the extending direction of a third bending line extending along a direction intersecting the extending direction of the first bending line. The third bending portion and the fourth bending portion are provided on one side and the other side of the second main body portion along the extending direction of the first bending line. The third bending portion is bent to the side opposite to the first main body portion along the extending direction of a fourth bending line extending along a direction intersecting the extending direction of the first bending line. The fourth bending portion is bent to the side opposite to the first main body portion along the extending direction of a fifth bending line extending along a direction intersecting the extending direction of the first bending line. The extending directions of the second to fifth bending lines are set, for example, in a direction orthogonal (including "substantially orthogonal") to the extending direction of the first bending line. In this case, the first main body portion, the first bending portion, and the second bending portion are arranged in a U shape. Similarly, the second main body portion, the third bending portion, and the fourth bending portion are arranged in a U shape. The first main body portion has a first edge on the side opposite to the first folding line. The first folding portion has a second edge on the side opposite to the first folding line and has an outer peripheral portion on the first folding line side. The second folding portion has a third edge on the side opposite to the first folding line and has an outer peripheral portion on the first folding line side. The first main body portion has an extending portion that extends on the side opposite to the first folding line from the second edge of the first folding portion and the third edge of the second folding portion, and has a connecting portion that extends on the first folding line side from the outer peripheral portions of the first folding portion and the second folding portion. The second main body portion has a fourth edge on the side opposite to the first folding line. The third folding portion has a fifth edge on the side opposite to the first folding line and has an outer peripheral portion on the first folding line side. The fourth folding portion has a sixth edge on the side opposite to the first folding line and has an outer peripheral portion on the first folding line side. The second main body portion has an extending portion that extends on the side opposite to the first folding line from the fifth edge of the third folding portion and the sixth edge of the fourth folding portion, and has a connecting portion that extends on the first folding line side from the outer peripheral portions of the third folding portion and the fourth folding portion. In the phase insulation member of the first invention, the insulation characteristics at the center in the slot formed by adjacent teeth can be improved by the first main body portion and the second main body portion. It is possible. Also, The first bent portion and the third bent portion can improve the Insulation characteristics between the outer diameter and the inner diameter on one side in the circumferential direction in the slot, and the second bent portion and the fourth bent portion can improve the Insulation characteristics between the inner diameter and the outer diameter on the other side in the circumferential direction in the slot. Also, the insulation characteristics on the side opposite to the first folding line can be improved by the extending portions of the first main body portion and the second main body portion. In different forms of the first invention First , the second to fifth bent lines extend in a direction orthogonal (including "substantially orthogonal") to the extending direction of the first bent line. And the length of the second bent portion along the direction orthogonal (including "substantially orthogonal") to the extending direction of the third bent line and the length of the fourth bent portion along the direction orthogonal (including "substantially orthogonal") to the extending direction of the fifth bent line are set to be longer than the length of the first bent portion along the direction orthogonal (including "substantially orthogonal") to the extending direction of the second bent line and the length of the third bent portion along the direction orthogonal (including "substantially orthogonal") to the extending direction of the fourth bent line. In this embodiment, the insulation characteristics on the side where the second bent portion and the fourth bent portion are arranged can be improved. The second invention relates to a stator. The stator of the second invention has a stator core, a resin bobbin, a stator winding, and a phase insulation member. The stator core has a plurality of teeth formed by a yoke extending along the circumferential direction, a tooth base portion extending radially inward from the yoke along the radial direction, and a tooth tip portion provided on the tip side of the tooth base portion and extending along the circumferential direction. The resin bobbin is disposed on both axial sides of the stator core and has an outer wall portion extending along the axial direction and the circumferential direction, a plurality of inner wall portions disposed radially inward of the outer wall portion and extending along the axial direction and the circumferential direction, and a plurality of connecting portions extending along the radial direction and connecting the outer wall portion and each inner wall portion. The resin bobbin is formed of a resin having various known insulating properties. The stator winding is wound around each tooth in a state where the resin bobbin is disposed on both axial sides of the stator core such that the outer wall portion, the connecting portion, and the inner wall portion of the resin bobbin face the yoke, the tooth base portion, and the tooth tip portion of the stator core. That is, in the stator of the present invention, the stator winding is wound around each tooth in a concentrated winding method. The phase insulation member is disposed between the stator windings wound around adjacent teeth. In the present invention, the phase insulation member described above in the first invention is used as the phase insulation member. The first main body portion and the second main body portion of the phase insulation member are disposed between the stator windings wound around adjacent teeth. The first bent portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on one side in the circumferential direction among the adjacent teeth and the tooth tip portion of the tooth. The second bent portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on one side in the circumferential direction and the yoke. The third bent portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on the other side in the circumferential direction among the adjacent teeth and the tooth tip portion of the tooth. The fourth bent portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on the other side in the circumferential direction and the yoke. In the stator of the second invention, the first body portion and the second body portion can improve the insulation characteristics at the central portion within the slot formed by adjacent teeth. The first bent portion and the third bent portion can improve the insulation characteristics on the radially inner side within the slot, and the second bent portion and the fourth bent portion can improve the insulation characteristics on the radially outer side within the slot. Further, by moving the first bent portion and the third bent portion along the axial direction between the stator winding and the tip of the tooth, and moving the second bent portion and the fourth bent portion along the axial direction between the stator winding and the yoke, the first body portion and the second body portion can be easily and stably arranged between the stator windings. In the first different form of the second invention , The inner wall portion of the resin bobbin is On one side in the circumferential direction, it has a first stepped surface that forms a first notch portion with an opening on one side in the circumferential direction and on the stator core side. On the other side in the circumferential direction, it has a second stepped surface that forms a second notch portion with an opening on the other side in the circumferential direction and on the stator core side. The first notch portion and the second notch portion are formed to communicate with each other in the radial direction, for example. The first stepped surface is formed by, for example, a first circumferential stepped surface that extends parallel (including "substantially parallel") to the core end surface of the stator core along the circumferential direction and a first axial stepped surface that extends along the axial direction. The second stepped surface is formed by, for example, a second circumferential stepped surface that extends parallel (including "substantially parallel") to the core end surface of the stator core along the circumferential direction and a second axial stepped surface that extends along the axial direction. The phase insulation member is configured such that the second edge of the first bent portion abuts against the second stepped surface (for example, the second circumferential stepped surface) of the inner wall portion of the resin bobbin, which is disposed at a position facing the tip of the tooth of the tooth formed on one side in the circumferential direction, and the fourth edge of the third bent portion abuts against the first stepped surface (for example, the first circumferential stepped surface) of the inner wall portion of the resin bobbin, which is disposed at a position facing the tip of the tooth of the tooth formed on the other side in the circumferential direction. In this form, the first extending portion of the first body portion and the second extending portion of the second original portion can improve the insulation characteristics on the resin bobbin side along the axial direction. In a second different form of the second invention, as the phase insulation member, the phase insulation member of the second different form of the first invention described above is used. In this form, the insulation characteristics between the stator winding and the yoke can be further improved, and the holding force for holding the second bent portion and the fourth bent portion can be increased. The third invention relates to an electric motor. The electric motor of the third invention includes a stator and a rotor rotatably supported with respect to the stator. And any of the stators described above is used as the stator. In the present invention, it has the same effect as the stator described above.

Advantages of the Invention

[0006] By using the phase insulation member of the present invention, the insulation characteristics of the stator or the electric motor can be improved.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, the description of "axial direction" indicates the extending direction of the rotation center line of the rotor in a state where the rotor is arranged rotatably relative to the stator. The rotation center line corresponds to the "stator center line". The description of "circumferential direction" indicates the circumferential direction centered on the rotation center line when viewed in a cross-section perpendicular to the axial direction in a state where the rotor is arranged rotatably relative to the stator. The description of "radial direction" indicates the direction passing through the rotation center line when viewed in a cross-section perpendicular to the axial direction in a state where the rotor is arranged rotatably relative to the stator. The description of "radial inner peripheral side" indicates the side along the radial direction toward the rotation center line, and the description of "radial outer peripheral side" indicates the side opposite to the rotation center line along the radial direction. Regarding the resin bobbin, the descriptions of "axial direction", "circumferential direction", and "radial direction" indicate the "axial direction", "circumferential direction", and "radial direction" in a state where the resin bobbin is arranged on both axial sides of the stator core.

[0009] First, an embodiment of the phase insulation member of the present invention will be described with reference to FIGS. 1 to 4. The phase insulation member 200 according to an embodiment is formed by bending the resin insulation film 100 shown in FIG. 1. As the resin insulation film 100, various known insulation films can be used. The insulation film 100 shown in FIG. 1 includes a main body portion 110, a first bending portion 120, a second bending portion 130, a third bending portion 140, and a fourth bending portion 150. The main body portion 110 has a rectangular shape formed by outer peripheral portions 101, 104 extending parallel to the x direction (left and right direction in FIG. 1), outer peripheral portions 101a, 101b, 104a, 104b, 107 (107a, 107b) and 108 (108a, 108b) extending parallel to the y direction (up and down direction in FIG. 1), and second to fifth bending lines 100B, 100C, 100D, and 100E extending parallel to the y direction.

[0010] The main body part 110 includes a first main body portion 111 and a second main body portion 112. The first main body portion 111 and the second main body portion 112 are divided by a first bending line 100A that extends parallel to the x-direction at the center along the y-direction of the main body part 110.

[0011] The first bending part 120 is provided on one side (the left side in FIG. 1) of the first main body portion 111 along the extending direction of the first bending line 100A. The first bending part 120 is formed by a second bending line 100B, an outer peripheral portion 102 that faces the second bending line 100B along the x-direction, and outer peripheral portions 102a and 102b that face each other along the y-direction. The second bending part 130 is provided on the other side (the right side in FIG. 1) of the first main body portion 111 along the extending direction of the first bending line 100A. The second bending part 130 is formed by a third bending line 100C, an outer peripheral portion 103 that faces the third bending line 100C along the x-direction, and outer peripheral portions 103a and 103b that face each other along the y-direction. The third bending part 140 is provided on one side (the left side in FIG. 1) of the second main body portion 112 along the extending direction of the first bending line 100A. The third bending part 140 is formed by a fourth bending line 100D, an outer peripheral portion 105 that faces the fourth bending line 100D along the x-direction, and outer peripheral portions 105a and 105b that face each other along the y-direction. The fourth bending part 150 is provided on the other side (the right side in FIG. 1) of the second main body portion 112 along the extending direction of the first bending line 100A. The fourth bending part 150 is formed by a fifth bending line 100E, an outer peripheral portion 106 that faces the fifth bending line 100E along the x-direction, and outer peripheral portions 106a and 106b that face each other along the y-direction. In this embodiment, the width of the second bending portion 130 (the length in the direction orthogonal to the extending direction of the third bending line 100C) m and the width of the fourth bending portion 150 (the length in the direction orthogonal to the extending direction of the fifth bending line 100E) m are set to be longer than the width of the first bending portion 120 (the length in the direction orthogonal to the extending direction of the second bending line 100B) n and the width of the third bending portion 140 (the length in the direction orthogonal to the extending direction of the fourth bending line 100D) n (m > n).

[0012] The length between the outer peripheral portion 101 of the first main body portion 111 and the first bending line 100A is set such that the outer peripheral portion 101 of the first main body portion 111 is disposed at a position farther from the side opposite to the first bending line 100A than the outer peripheral portion 102b of the first bending portion 120 and the outer peripheral portion 103b of the second bending portion 130. Thereby, the first main body portion 111 has an extending portion 111B that extends to the side opposite to the first bending line 100A from the outer peripheral portion 102b of the first bending portion 120 and the outer peripheral portion 103b of the second bending portion 130. The first main body portion 111 has a connecting portion 111C formed by the first bending line 100A, the outer peripheral portions 107a, 108a on the side of the first bending line 100A from the outer peripheral portion 102a of the first bending portion 120 and the outer peripheral portion 103a of the second bending portion 130. Also, the first main body portion 111 has a central portion 111A between the extending portion 111B and the connecting portion 111C. The length between the outer peripheral portion 104 of the second main body portion 112 and the first bending line 100A is set such that the outer peripheral portion 104 of the second main body portion 112 is disposed at a position farther from the side opposite to the first bending line 100A than the outer peripheral portion 105b of the third bending portion 140 and the outer peripheral portion 106b of the fourth bending portion 150. Thereby, the second main body portion 112 has an extending portion 112B that extends to the side opposite to the first bending line 100A from the outer peripheral portion 105b of the third bending portion 140 and the outer peripheral portion 106b of the fourth bending portion 150. The second main body portion 112 has a connection portion 112C formed by the first folding line 100A, the outer peripheral portions 107b and 108b on the first folding line 100A side from the outer peripheral portion 105a of the third folding portion 140 and the outer peripheral portion 106a of the fourth folding portion 150. Also, the second main body portion 112 has a central portion 112A between the extending portion 112B and the connection portion 112C.

[0013] The main body portion 110 corresponds to the "main body portion" of the present invention, the first main body portion 111 corresponds to the "first main body portion" of the present invention, and the second main body portion 112 corresponds to the "second main body portion" of the present invention. The outer peripheral portion 101 of the first main body portion 111 corresponds to the "first edge portion on the side opposite to the first folding line of the first main body portion" of the present invention, the outer peripheral portion 102b of the first folding portion 120 corresponds to the "second edge portion on the side opposite to the first folding line of the first folding portion" of the present invention, the outer peripheral portion 103b of the second folding portion 130 corresponds to the "third edge portion on the side opposite to the first folding line of the second folding portion" of the present invention, the outer peripheral portion 104 of the second main body portion 112 corresponds to the "fourth edge portion on the side opposite to the first folding line of the second main body portion" of the present invention, the outer peripheral portion 105b of the third folding portion 140 corresponds to the "fifth edge portion on the side opposite to the first folding line of the third folding portion" of the present invention, and the outer peripheral portion 106b of the fourth folding portion 150 corresponds to the "sixth edge portion on the side opposite to the first folding line of the fourth folding portion" of the present invention.

[0014] Next, the phase insulation member 200 will be described. FIGS. 2 and 3 show a phase insulation member 200 formed by folding the insulation film 100 shown in FIG. 1. Note that FIG. 3 is a perspective view of FIG. 2 viewed from the direction of arrow III. The first main body portion 111 and the second main body portion 112 forming the main body portion 110 are bent in a V shape along the first folding line 100A. The first bent portion 120 is bent along the second bending line 100B to the side opposite to the second main body portion 112. The second bent portion 130 is bent along the third bending line 100C to the side opposite to the second main body portion 112. As a result, the first main body portion 111, the first bent portion 120, and the second bent portion 130 are arranged in a U shape with the side opposite to the second main body portion 112 being open. The third bent portion 140 is bent along the fourth bending line 100D to the side opposite to the first main body portion 111. The fourth bent portion 150 is bent along the fifth bending line 100E to the side opposite to the first main body portion 111. As a result, the second main body portion 112, the third bent portion 140, and the fourth bent portion 150 are arranged in a U shape with the side opposite to the first main body portion 111 being open.

[0015] When inserting the phase insulation member 200 into the slot 26 of the stator core 20 described later, an external force is applied to the phase insulation member 200 so that the outer peripheral portion 101 of the first main body portion 111 approaches the outer peripheral portion 104 of the second main body portion 112. As a result, the phase insulation member 200 is folded into a T shape as shown in FIG. 4. Then, the folded phase insulation member 200 is inserted axially into the slot 26 from the side of the first bending line 100A. When the application of the external force to the phase insulation member 200 is stopped with the phase insulation member 200 inserted into the slot 26, the phase insulation member 200 is held in the slot 26 by the elastic restoring force.

[0016] Next, an embodiment of the stator of the present invention will be described with reference to FIGS. 5 to 8. FIG. 1 is a perspective view of the stator 10 of an embodiment, FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, FIG. 7 is an enlarged view of the portion indicated by arrow VII in FIG. 6, and FIG. 8 is an enlarged view of the portion indicated by arrow VIII in FIG. 5. Note that the stator 10 of the embodiment uses the above-described phase insulation member 200. Also, in FIG. 8, the illustration of the stator winding is omitted.

[0017] The stator 10 of this embodiment is composed of a stator core 20, slot insulating members 30, stator windings 40, resin bobbins 50, and phase insulating members 200. The stator core 20 is composed of a laminate formed by laminating a plurality of electromagnetic steel sheets, and has core end faces 20A and 20B on one side in the axial direction and the other side in the axial direction. As viewed in a cross-section perpendicular to the axial direction (see FIG. 5), the stator core 20 has a yoke 21 extending along the circumferential direction and a plurality of teeth 22 extending radially inward from the yoke 21 along the radial direction. The teeth 22 have a tooth base portion 23 extending along the radial direction and a tooth tip portion 24 provided on the radially inner side of the tooth base portion 23 and extending along the circumferential direction. An inner space 20a is formed by the radially inner tooth tip face 25 of the tooth tip portion 24. Slots 26 are formed by the teeth 24 adjacent to each other in the circumferential direction. The slot insulating members 30 are inserted into the slots 26. The slot insulating members are formed of an insulating film made of resin. Various known insulating films can be used as the insulating film. The stator windings 40 are wound around each tooth 22 (specifically, the tooth base portion 23) in a state where the slot insulating members 30 are inserted into the slots 26 and resin bobbins 50 (described later) are arranged on both axial sides of the stator core 20. That is, the stator 10 of this embodiment is a concentrated winding type stator in which the stator windings 40 are wound around each tooth 22 in a concentrated winding method. A rotor (not shown) is rotatably arranged in the inner space 20a of the stator core 20. One embodiment of the motor of the present invention is constituted by the stator 10 and a rotor rotatably arranged in the inner space 20a.

[0018] The resin bobbins 50 are formed of a resin having insulating properties. Various known resins can be used as the resin having insulating properties. As shown in FIG. 8, the resin bobbins 50 have an outer wall portion 60, a plurality of inner wall portions 70, and a plurality of connecting portions 80. The outer wall portion 60 extends along the axial direction and the circumferential direction. The inner wall portion is disposed radially inward of the outer wall portion 60 and extends along the axial direction and the circumferential direction. The connecting portion 80 extends along the radial direction and connects the outer wall portion 60 and the inner wall portion 70. In the present embodiment, the inner wall portion 70 has a notch portion 73 on one side in the circumferential direction (the left side in FIG. 8) and a notch portion 74 on the other side in the circumferential direction (the right side in FIG. 8). The notch portion 73 is open on one side in the circumferential direction and the other side in the axial direction (the stator core 20 side). In FIG. 8, the notch portion 73 is also open radially inward and radially outward (communicates in the radial direction). The notch portion 73 is formed by stepped surfaces 73a and 73b. The stepped surface 73a extends parallel (including "substantially parallel") to the core end face 20A of the stator core 20 along the circumferential direction, and the stepped surface 73b extends along the axial direction. The notch portion 74 is open on the other side in the circumferential direction and the other side in the axial direction (the stator core 20 side). In FIG. 8, the notch portion 74 is also open radially inward and radially outward (communicates in the radial direction). The notch portion 74 is formed by stepped surfaces 74a and 74b. The stepped surface 74a extends parallel (including "substantially parallel") to the core end face 20A of the stator core 20 along the circumferential direction, and the stepped surface 74b extends along the axial direction. Note that a resin bobbin having stepped portions on one side and the other side in the circumferential direction of the inner wall portion is disclosed, for example, in Japanese Patent Laid-Open No. 2012-55098.

[0019] The notch portion 73 of the inner wall portion 70 of the resin bobbin 50 corresponds to the "first notch portion" of the present invention, and the stepped surfaces 73a and 73b of the inner wall portion 70 correspond to the "first stepped surfaces forming the first notch portion" of the present invention. Note that the stepped surface 73a corresponds to the "first circumferential stepped surface" of the present invention, and the stepped surface 73b corresponds to the "first axial stepped surface" of the present invention. The notch 74 in the inner wall portion 70 of the resin bobbin 50 corresponds to the "second notch" of the present invention, and the stepped surfaces 74a, 74b of the inner wall portion 70 correspond to the "second stepped surfaces forming the second notch" of the present invention. Note that the stepped surface 74a corresponds to the "second circumferential stepped surface" of the present invention, and the stepped surface 74b corresponds to the "second axial stepped surface" of the present invention.

[0020] Next, the operation of inserting the phase insulation member 200 into the slot 26 of the stator core 20 will be described. First, an external force is applied to the phase insulation member 200, and it is folded into a T shape as shown in FIG. 4. The phase insulation member 200 is inserted into the slot 26 in a folded T shape. For example, as shown in FIG. 5, with the first bending line 100A side (the connection portions 111C and 112C side) arranged on one axial side of the slot 26, the phase insulation member 200 is moved axially along the axial direction to the other axial side. At this time, the first bending portion 120 and the third bending portion 140 move axially between the stator winding 40 and the tip portion 24 of the tooth. That is, the first bending portion 120 moves axially between the stator winding 40 wound around the tooth 22 arranged (formed) on one circumferential side of the teeth 22 forming the slot 26 and the tip portion 24 of the tooth 22 arranged (formed) on the one circumferential side. The third bending portion 130 moves axially between the stator winding 40 wound around the tooth 22 arranged (formed) on the other circumferential side of the teeth 22 forming the slot 26 and the tip portion 24 of the tooth 22 arranged (formed) on the other circumferential side. Further, the second bent portion 130 and the fourth bent portion 150 move axially between the stator winding 40 and the yoke 21 of the stator core 20. That is, the second bent portion 130 moves axially between the stator winding 50 wound around the teeth 22 disposed (formed) on one circumferential side of the teeth 22 forming the slots 26 and the yoke 21. The fourth bent portion 150 moves axially between the stator winding 40 wound around the teeth 22 disposed (formed) on the other circumferential side of the teeth 22 forming the slots 26 and the yoke 21. Thereby, the phase insulation member 200 can be easily and stably inserted into the slots 26.

[0021] When the insertion of the phase insulation member 200 into the slots 26 is completed, the application of an external force to the phase insulation member 200 is stopped. Thereby, the phase insulation member 200 is held in the slots 26 by the elastic restoring force that returns to its original shape (V shape). At this time, as shown in FIG. 8, the outer peripheral portion 102b of the first bent portion 120 is disposed at a position facing the tooth tip portion 24 of the teeth 22 formed on one circumferential side and abuts against the second stepped surface (the second circumferential stepped surface 74a) of the inner wall portion 70 of the resin bobbin 50. Further, the outer peripheral portion 105b of the third bent portion 140 is disposed at a position facing the tooth tip portion 24 of the teeth 22 formed on the other circumferential side and abuts against the first stepped surface (the first circumferential stepped surface 73a) of the inner wall portion 70 of the resin bobbin 50. Thereby, the extending portion 111B of the first main body portion 111 and the extending portion 112B of the second main body portion 112 project axially on the side opposite to the stator core 20 from the second stepped surface 74 (the second circumferential stepped surface 74a) and the first stepped surface 73 (the first circumferential stepped surface 74a) of the inner wall portion 70 of the resin bobbin 50.

[0022] In the above manner, the phase insulation member 200 is inserted into the slots 26. At this time, the first main body portion 111 and the second main body portion 112 can improve the insulation characteristics between the stator windings 40 wound around the adjacent teeth 22. Also, the first bent portion 120 can improve the insulation characteristics (radial inner insulation characteristics) between the stator winding 40 wound around the tooth 22 formed on one side in the circumferential direction and the tooth tip portion 24 of the tooth 22 formed on one side in the circumferential direction. Also, the second bent portion 130 can improve the insulation characteristics (radial outer insulation characteristics) between the stator winding 40 wound around the tooth 22 formed on one side in the circumferential direction and the yoke 21. Also, the third bent portion 140 can improve the insulation characteristics (radial inner insulation characteristics) between the stator winding 40 wound around the tooth 22 formed on the other side in the circumferential direction and the tooth tip portion 24 of the tooth formed on the other side in the circumferential direction. Also, the fourth bent portion 150 can improve the insulation characteristics (radial outer insulation characteristics) between the stator winding 40 wound around the tooth 22 formed on the other side in the circumferential direction and the yoke 21. Also, in the present embodiment, first extending portions 111B and second extending portions 112B are provided on the sides of the first main body portion 111 and the second main body portion 112 opposite to the first bending line 100A. And in a state where the phase insulation member 200 is inserted into the slot 26, the first extending portion 111B of the first main body portion 111 and the second extending portion 112B of the second main body portion 112 are configured to project axially on the side opposite to the stator core 20. Thereby, the axial insulation characteristics between the stator windings 40 wound around the adjacent teeth 22 can be further improved. Also, the widths m of the second bent portion 130 and the fourth bent portion 150 are set to be larger than the widths n of the first bent portion 120 and the third bent portion 140. Thereby, the insulation characteristics (radial outer insulation characteristics) between the stator winding and the yoke can be further improved.

[0023] The present invention is not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. Although the phase insulation member and the stator have been described, the present invention can also be configured as "an electric motor including a stator and a rotor rotatably supported with respect to the stator". Although the width of the second bent portion and the width of the fourth bent portion are set to be larger than the width of the first bent portion and the width of the third bent portion, they can also be set to the same width, or can be set to be smaller than the width of the first bent portion and the width of the third bent portion. Although the extending portions are provided on the first main body portion and the second main body portion, the extending portions can also be omitted. The shape of the phase insulation member is not limited to the shape described in the embodiment. The configuration of the resin bobbin is not limited to the configuration described in the embodiment. The configurations described in the embodiments can be used alone, or a plurality of appropriately selected configurations can be combined and used.

Explanation of Reference Numerals

[0024] 10 Stator 20 Stator Core 20A, 20B Core End Faces 20a Inner Space 21 Yoke 22 Teeth 23 Tooth Bases 24 Tooth Tips 25 Tooth Tip Faces 26 Slots 26a Slot Openings 30 Slot Insulation Members 40 Stator Windings 50 Resin Bobbins 60 Outer Wall Portions 70 Inner Wall Portions 71, 72 Flange Portions 73, 74 Notch Portions 73a, 73b, 74a, 74b Step Faces 80 Connecting Portions 100 Insulating Films 100A - 100E folding lines 101 - 108, 101a - 108a, 101b - 108b outer peripheral parts 110 main body part 111 first main body part 111A central part 111B extending part 111C connecting part 112 second main body part 112A central part 112B extending part 112C connecting part 120 - 150 folding parts 200 phase insulation member

Claims

1. A phase insulation member disposed between stator windings wound around adjacent teeth, a first body portion and a second body portion that are bent in a V shape along a first bending line extending linearly at the center of a body portion having a rectangular shape, a first bent portion provided on one side of the first body portion along the extending direction of the first bending line and bent to the opposite side of the second body portion along the extending direction of a second bending line extending in a direction intersecting the extending direction of the first bending line, a second bent portion provided on the other side of the first body portion along the extending direction of the first bending line and bent to the opposite side of the second body portion along the extending direction of a third bending line extending in a direction intersecting the extending direction of the first bending line, a third bent portion provided on the one side of the second body portion along the extending direction of the first bending line and bent to the opposite side of the first body portion along the extending direction of a fourth bending line extending in a direction intersecting the extending direction of the first bending line, a fourth bent portion provided on the other side of the second body portion along the extending direction of the first bending line and bent to the opposite side of the first body portion along the extending direction of a fifth bending line extending in a direction intersecting the extending direction of the first bending line, and the first body portion has a first edge on the side opposite to the first bending line, the first bent portion has a second edge on the side opposite to the first bending line and an outer peripheral portion on the first bending line side, the second bent portion has a third edge on the side opposite to the first bending line and an outer peripheral portion on the first bending line side, the first body portion has an extending portion extending to the side opposite to the first bending line from the second edge of the first bent portion and the third edge of the second bent portion, and a connecting portion extending to the first bending line side from the outer peripheral portion of the first bent portion and the outer peripheral portion of the second bent portion, the second body portion has a fourth edge on the side opposite to the first bending line, the third bent portion has a fifth edge on the side opposite to the first bending line and an outer peripheral portion on the first bending line side, The fourth bent portion has a sixth edge on the side opposite to the first bending line, and has an outer peripheral portion on the first bending line side. The second main body portion has an extending portion extending to the side opposite to the first bending line from the fifth edge of the third bent portion and the sixth edge of the fourth bent portion, and has a connecting portion extending to the side of the first bending line from the outer peripheral portion of the third bent portion and the outer peripheral portion of the fourth bent portion. The phase insulation member is characterized by this. **Claim 2** The phase insulation member according to claim 1, the second to fifth bending lines extend in a direction orthogonal to the extending direction of the first bending line, the length of the second bent portion along the direction orthogonal to the extending direction of the third bending line and the length of the fourth bent portion along the direction orthogonal to the extending direction of the fifth bending line are set to be longer than the length of the first bent portion along the direction orthogonal to the extending direction of the second bending line and the length of the third bent portion along the direction orthogonal to the extending direction of the fourth bending line. The phase insulation member is characterized by this. **Claim 3** comprising a stator core, a resin bobbin, a stator winding, and a phase insulation member, the stator core has a yoke extending along the circumferential direction, a plurality of teeth formed by a teeth base portion extending radially inward from the yoke along the radial direction, and a teeth tip portion provided on the tip side of the teeth base portion and extending along the circumferential direction, the resin bobbin is disposed on both axial sides of the stator core, has an outer wall portion extending along the axial direction and the circumferential direction, a plurality of inner wall portions disposed radially inward of the outer wall portion and extending along the axial direction and the circumferential direction, and a plurality of connecting portions extending along the radial direction and connecting the outer wall portion and each inner wall portion, the stator winding is wound around each tooth in a state where the resin bobbin is disposed on both axial sides of the stator core such that the outer wall portion, the connecting portion, and the inner wall portion of the resin bobbin face the yoke, the teeth base portion, and the teeth tip portion of the stator core, the phase insulation member is a stator disposed between stator windings wound around adjacent teeth, the phase insulation member is A first body portion and a second body portion that are bent in a V shape along a first bending line extending linearly at the center of a body portion having a rectangular shape. A first bending portion provided on one side of the first body portion along the extending direction of the first bending line, and bent to the opposite side of the second body portion along the extending direction of a second bending line extending along a direction intersecting the extending direction of the first bending line. A second bending portion provided on the other side of the first body portion along the extending direction of the first bending line, and bent to the opposite side of the second body portion along the extending direction of a third bending line extending along a direction intersecting the extending direction of the first bending line. A third bending portion provided on the one side of the second body portion along the extending direction of the first bending line, and bent to the opposite side of the first body portion along the extending direction of a fourth bending line extending along a direction intersecting the extending direction of the first bending line. A fourth bending portion provided on the other side of the second body portion along the extending direction of the first bending line, and bent to the opposite side of the first body portion along the extending direction of a fifth bending line extending along a direction intersecting the extending direction of the first bending line. The first body portion has a first edge portion on the side opposite to the first bending line. The first bending portion has a second edge portion on the side opposite to the first bending line and has an outer peripheral portion on the first bending line side. The second bending portion has a third edge portion on the side opposite to the first bending line and has an outer peripheral portion on the first bending line side. The first body portion has an extending portion extending to the side opposite to the first bending line from the second edge portion of the first bending portion and the third edge portion of the second bending portion, and has a connecting portion extending to the first bending line side from the outer peripheral portion of the first bending portion and the outer peripheral portion of the second bending portion. The second body portion has a fourth edge portion on the side opposite to the first bending line. The third bending portion has a fifth edge portion on the side opposite to the first bending line and has an outer peripheral portion on the first bending line side. The fourth bending portion has a sixth edge portion on the side opposite to the first bending line and has an outer peripheral portion on the first bending line side. The second main body portion has an extending portion extending to the side opposite to the first folding line from the fifth edge portion of the third folding portion and the sixth edge portion of the fourth folding portion, and has a connecting portion extending to the side of the first folding line from the outer peripheral portion of the third folding portion and the outer peripheral portion of the fourth folding portion. The first main body portion and the second main body portion of the phase insulation member are disposed between stator windings wound around adjacent teeth. The first folding portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on one side in the circumferential direction among the adjacent teeth and the tooth tip portion of the tooth. The second folding portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on one side in the circumferential direction and the yoke. The third folding portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on the other side in the circumferential direction among the adjacent teeth and the tooth tip portion of the tooth. A stator, wherein the fourth folding portion of the phase insulation member is disposed between the stator winding wound around the tooth formed on the other side in the circumferential direction and the yoke.

4. The stator according to claim 3, The inner wall portion of the resin bobbin has a first stepped surface that forms a first notch portion opened on one side in the circumferential direction and on one side in the circumferential direction and the stator core side on one side in the circumferential direction, and has a second stepped surface that forms a second notch portion opened on the other side in the circumferential direction and on the other side in the circumferential direction and the stator core side on the other side in the circumferential direction. The phase insulation member is configured such that the second edge portion of the first folding portion abuts against the second stepped surface of the inner wall portion of the resin bobbin, which is disposed at a position facing the tooth tip portion of the tooth formed on one side in the circumferential direction, and the fifth edge portion of the third folding portion abuts against the first stepped surface of the inner wall portion of the resin bobbin, which is disposed at a position facing the tooth tip portion of the tooth formed on the other side in the circumferential direction. A stator characterized by this.

5. The stator according to claim 3 or 4, The second to fifth folding lines extend in a direction orthogonal to the extending direction of the first folding line. The length of the second bent portion along the direction orthogonal to the extending direction of the third bent line and the length of the fourth bent portion along the direction orthogonal to the extending direction of the fifth bent line are set to be longer than the length of the first bent portion along the direction orthogonal to the extending direction of the second bent line and the length of the third bent portion along the direction orthogonal to the extending direction of the fourth bent line. A stator characterized by this.

6. An electric motor comprising a stator and a rotor rotatably supported with respect to the stator, wherein the stator according to any one of claims 3 to 5 is used as the stator. An electric motor characterized by this.

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