JP2012055098A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for easily inserting a winding insulation member into a slot.SOLUTION: End insulation members 20 are arranged on both sides in an axial direction of a stator core 10 having a yoke 11 and tooth 12. Each end insulation member 20 includes: a first member 30 which is arranged in a position confronted with a tooth tip portion 14 and extends along a circumferential direction; a second member 40 arranged in a position confronted with the yoke 11; and a coupling portion 50 which is arranged in a position confronted with a tooth base portion 13 and couples the first member 30 and the second member 40. At least one of the end insulation members 20 includes a step portion 31 and a notch portion 32 (guide portion) formed at both ends in the circumferential direction of the first member 30. A first winding insulation member 70 is guided by the notch portion 32, is inserted into a slot 15 and is fixed into the slot 15 by the step portion 31.

Description

  The present invention relates to an electric motor, and more particularly to a technique for inserting a winding insulating member into a slot of a stator of the electric motor.

As a winding method for winding the stator winding around the stator, a concentrated winding method is known in which the stator winding is directly wound around the teeth of the stator core of the stator. An electric motor in which a stator winding is wound around a stator using a concentrated winding method is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-112488.
In such a concentrated winding type motor, in order to prevent the stator winding from protruding from the slot opening and the occurrence of insulation failure between adjacent stator windings in the slot, the winding insulation member is a slot. Inserted inside. For example, a winding insulating member having a V-shaped cross section is inserted into the slot (see FIG. 10). The winding insulating member is inserted into the slot so that the V-shaped opening faces the slot opening (so that the slot opening is covered by the winding insulating member). This prevents the stator winding from jumping out of the slot opening. Further, it is inserted into the slot so that the winding insulation member is disposed between the adjacent stator windings. This prevents the occurrence of poor insulation between the stator windings in the slot. This V-shaped winding insulating member is called an “interphase insulating member”. Alternatively, a winding insulating member having a straight cross section is inserted into the slot (see FIG. 27). The linear winding insulating member is inserted into the slot so that the slot opening is covered by the winding insulating member. This linear winding insulating member is called a “wedge insulating member”. Note that both ends in the circumferential direction of the winding insulating member are sandwiched between a stator winding and a tooth disposed in the slot.

JP 2002-112488 A

Usually, a thin sheet-like (film-like) insulating member is used as the winding insulating member (V-shaped winding insulating member or linear winding insulating member). For this reason, it is difficult to insert the winding insulation member into the slot so that both ends of the winding insulation member in the circumferential direction are sandwiched between the stator winding and the teeth arranged in the slot. is there. In particular, when a large number of stator windings are arranged in the slots, the circumferential ends of the winding insulating member are connected between the stator winding and the teeth while preventing the winding insulating member from bending. Positioning and inserting between them is extremely difficult.
The present invention has been made in view of such a point, and an object of the present invention is to provide a technique capable of easily inserting a winding insulating member into a slot.

The electric motor of the present invention can be used as a motor for driving a compressor, a motor for driving a vehicle, a motor for driving an in-vehicle device, etc. provided in a refrigerator, an air conditioner or the like.
The electric motor of the present invention includes a stator and a rotor. The stator includes a stator core, a slot insulating member, a stator winding, a winding insulating member, and an end insulating member. The electric motor of the present invention has an electric motor (inner motor) in which the rotor is rotatably supported inside the stator or an electric motor (external motor) in which the rotor is rotatably supported on the outer peripheral side of the stator. A rotary electric motor).
The stator core has a yoke and a plurality of teeth. The stator core is configured by laminating plate-like members, typically thin-plate electromagnetic steel plates, in the axial direction. “Axial direction” indicates the direction of the rotation axis of the rotor, that is, the direction of the rotation center line in a state where the rotor is rotatably supported with respect to the stator. The yoke extends along the circumferential direction when viewed in a cross section perpendicular to the axial direction. The “circumferential direction” indicates a circumferential direction centered on the rotation center line when viewed in a cross section perpendicular to the axial direction. The yoke is typically formed in an annular shape (including a substantially annular shape). Each tooth has a tooth base extending in the radial direction from the yoke and a distal end side of the tooth base extending from the yoke and extending in the circumferential direction, as viewed in a cross section perpendicular to the axial direction. The teeth tip portion is formed with a tooth tip surface. The “radial direction” indicates a direction perpendicular to the rotation center line when viewed in a cross section perpendicular to the axial direction. In the case of an add-on motor, the teeth extend radially inward from the yoke, and in the case of an externally driven motor, the teeth extend radially outward from the yoke. The rotor is rotatably supported so as to have a gap between the front end surface of the teeth. The direction in which the teeth extend is appropriately selected according to the type of the electric motor. For example, in an internal rotation type motor in which the rotor is rotatably supported inside the stator, it extends radially inward, and in an external rotation type motor in which the rotor is rotatably supported outside the stator, radially outward. Extend.
A slot is formed by two teeth and a yoke adjacent to each other in the circumferential direction among the plurality of teeth. The slot is open between the tooth tips of the two teeth. A stator winding is disposed in each slot via a slot insulating member. As the slot insulating member, an elastic sheet-like (film-like) insulating member is typically used. A concentrated winding method is used as a winding method of the stator winding.
The winding insulating member is inserted into the slot in a state where both ends in the circumferential direction are sandwiched between the stator winding and the teeth arranged in the slot so as to close at least the opening of the slot. The winding insulating member may be disposed between the slot insulating member and the stator winding, or may be disposed between the slot insulating member and the tooth tip. As the winding insulating member, a sheet-like (film-like) insulating member having elasticity is typically used. Moreover, the coil | winding insulation member of the various shapes which can block | close the opening of a slot can be used.
The end insulating members are disposed on both sides in the axial direction of the stator core. For example, a resin insulating member is used as the end insulating member. The end insulating member is disposed at a position facing the tooth tip of the tooth, the first member extending along the circumferential direction, the second member disposed at a position facing the yoke, and the teeth. And a connecting member that connects the first member and the second member. The stator winding is directly wound around the coupling portion disposed at a position facing the teeth and the teeth base portion in a state where the end insulating members are disposed on both sides in the axial direction of the stator core. Preferably, when the end insulating members are arranged on both sides in the axial direction of the stator core, the rotor-side surface of the first member is configured not to protrude from the teeth tip surface to the rotor side.
Further, at least one of the end insulating members is provided with a step portion and a guide portion at both ends in the circumferential direction of the first member. The step portion has a shape in which a portion facing the axial end surface of the stator core is cut out along the circumferential direction from the opening side of the slot. Preferably, the step portion is formed by a surface including a surface parallel to (including substantially parallel to) the axial end surface of the stator core. The stepped portion preferably has a shape penetrating in the radial direction, but may have a shape in which one side in the radial direction is notched. The guide part is formed along the axial direction so as to communicate with the step part. The guide part should just communicate with the level | step difference part. That is, the guide portion may be formed at least in part along the axial direction of the circumferential end portion of the first member, or penetrates the circumferential end portion of the first member along the axial direction. It may be formed.
The winding insulating member is inserted into the slot by being guided by the guide portion of the first member at both ends in the circumferential direction, and the end portion in the axial direction is locked in the step portion of the first member. Fixed to. Preferably, the winding insulating member is inserted into the slot in a state of being elastically deformed so that the interval between the circumferential end portions is shortened by the application of an external force. The distance between both ends in the direction becomes longer, and the end in the axial direction is locked to the stepped portion.
In the present invention, the winding insulating member can be inserted into the slot using the guide portion of the first member of the end insulating member. As a result, both end portions in the circumferential direction of the winding insulating member can be easily positioned between the stator windings disposed in the slots and the slots. Further, the winding insulating member inserted into the slot can be fixed by the step portion of the first member of the end winding member. Thereby, the winding insulation member can be reliably fixed in the slot.

In a different form of the invention, the slot insulation member protrudes from the axial end face of the stator core. Preferably, the length of the slot insulating member protruding from the axial end surface of the stator core is set to be equal to or shorter than the axial length of the step portion of the first member of the end insulating member.
In this embodiment, it is possible to prevent insulation failure from occurring at the boundary between the end insulating member and the axial end surface of the stator core.

In another different aspect of the present invention, the winding insulating member is bent into a V shape (including a substantially V shape) when viewed in a cross section perpendicular to the axial direction. The winding insulating member is inserted into the slot so that the V-shaped opening faces the opening of the slot. At this time, the portion (main body portion) forming the V-shaped opening is disposed between adjacent stator windings in the slot. Preferably, the V-shaped winding insulating member is inserted into the slot in an elastically deformed state so that the interval between the V-shaped openings is shortened by applying an external force, and the external force is reduced in the slot. The interval between the V-shaped openings is increased by the elastic restoring force, and the axial end is locked to the stepped portion.
In this embodiment, it is possible to prevent the stator winding from projecting from the slot opening to the rotor side and the occurrence of insulation failure between adjacent stator windings in the slot.

  When a V-shaped winding insulating member is used, preferably, both end portions in the circumferential direction are bent to the opposite side of the V-shaped opening to form a bent portion. In this case, the bent portion is guided by the guide portion of the first member of the end insulating member, and is sandwiched between the stator winding and the teeth disposed in the slot. As a result, the V-shaped winding insulating member can be easily inserted into the slot.

In another different embodiment of the present invention, the winding insulating member is formed in a straight line shape (including a substantially straight line shape) when viewed in a cross section perpendicular to the axial direction. The winding insulating member is inserted into the slot so as to close the opening of the slot.
In this embodiment, a winding insulating member for preventing the stator winding from jumping out from the opening of the slot to the rotor side can be easily inserted into the slot.

In another different form of the present invention, the guide portion is constituted by a cutout portion having a shape in which the rotor side portions of both end portions in the circumferential direction of the first member are cut out at least partially along the axial direction. Has been.
In this embodiment, it is possible to easily visually check the portion where the winding insulating member is inserted through the notches formed on the rotor side at both ends in the circumferential direction of the first member. Thereby, the efficiency of the operation | work which inserts a coil | winding insulation member in a slot improves.

  When the guide portion is constituted by a notch portion having a shape in which the rotor-side portion is notched at both ends in the circumferential direction of the first member, the radial width A at the circumferential tip position of the tooth tip portion and The surface on the rotor side of the teeth tip surface and the circumferential end of the first member at the circumferential tip of the circumferential end of the first member on the axial end surface of the stator core Is preferably set so that the width B in the radial direction between the two satisfies [A ≦ B]. "The tip end surface of the teeth at the tip end in the circumferential direction of the end portion in the circumferential direction of the first member and the end side in the axial direction of the stator core, and the rotor end of the tip end in the circumferential direction of the first member. "Radial width between the surfaces" means "the radial direction between the tip end surface of the teeth and the point Q closest to the tip end in the circumferential direction and the end surface side in the axial direction of the stator core on the surface forming the notch." "Width" corresponds.

In another different form of the present invention, the guide portion has a cutout portion having a shape in which the portions on the opposite side of the rotor at both ends in the circumferential direction are cut out at least partially along the axial direction. It is comprised by.
In this form, since the part on the opposite side to a rotor of the circumferential direction both ends of the 1st member is notched, a coil | winding insulation member can be easily inserted in a guide part. Thereby, the efficiency of the operation | work which inserts a coil | winding insulation member in a slot improves.

  In the case where the guide portion is constituted by a notch portion in which the portion on the opposite side of the rotor on both ends in the circumferential direction of the first member is notched, the radial width A at the circumferential tip position of the tooth tip portion, The tip end face of the tooth at the tip end in the circumferential direction of the end of the first member in the circumferential direction and on the end face side in the axial direction of the stator core, and the opposite end of the first member in the circumferential end of the first member It is preferable that the radial width C between the two surfaces is set so as to satisfy [A ≦ C]. “The tip end face of the teeth at the tip end in the circumferential direction of the end of the first member in the circumferential direction on the axial end face side of the stator core and the rotor at the end of the first member in the circumferential direction are opposite to the rotor. The radial width between the side surface and the side surface is defined as “between the tip end surface of the teeth and the point Q closest to the tip end in the circumferential direction and on the end surface side in the axial direction of the stator core. "Radial width" corresponds.

In another different form of the present invention, the guide portion is constituted by a groove formed along the axial direction at the circumferential end portion of the first member. This groove is formed by a surface on the rotor side and a surface on the opposite side of the rotor.
In this form, since the guide part is comprised by the groove | channel, the coil | winding insulation member can be guided with the surface by the side of the rotor which forms a groove | channel, and a rotor side. Thereby, the efficiency of the operation | work which inserts a winding member in a slot improves.

  When the guide portion is configured by a groove formed at the circumferential end of the first member, the radial width A at the circumferential tip of the tooth tip and the circumference of the circumferential end of the first member. The radial width D between the tooth tip surface and the rotor-side surface among the surfaces forming the grooves at the axial tip surface side of the stator core is [A ≦ D. ] Is preferably satisfied. “Between the tip end surface of the teeth and the surface on the rotor side of the surfaces forming the grooves at the tip end in the circumferential direction of the first end of the first member on the axial end surface side of the stator core The radial width of “the radial width between the tooth tip surface and the point Q on the circumferential tip side and the axial end surface side of the stator core on the rotor side surface forming the groove” The width corresponds.

  In the electric motor of the present invention, the winding insulating member can be easily inserted into the slot.

1 is a perspective view of a stator of an electric motor according to a first embodiment. It is the elements on larger scale of II of FIG. It is the elements on larger scale of III of FIG. It is a fragmentary top view of the stator of the motor of a 1st embodiment. It is a perspective view of the 1st coil insulation member. It is a figure explaining the operation | movement which inserts the 1st coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is a partial enlarged view which shows the state before inserting the 1st coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is the elements on larger scale which show the state which has inserted the 1st coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is a partial enlarged view which shows the state which inserted the 1st coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is sectional drawing which shows the state which inserted the 1st coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is the elements on larger scale of the stator of the electric motor of 2nd Embodiment. It is the elements on larger scale of the stator of the electric motor of 3rd Embodiment. It is the elements on larger scale of the stator of the electric motor of 4th Embodiment. It is the elements on larger scale of the stator of the electric motor of 5th Embodiment. It is the elements on larger scale of the stator of the electric motor of 6th Embodiment. It is the elements on larger scale of the stator of the electric motor of 7th Embodiment. It is the elements on larger scale of the stator of the electric motor of 8th Embodiment. It is the elements on larger scale of the stator of the electric motor of 9th Embodiment. It is the elements on larger scale of the stator of the electric motor of 10th Embodiment. It is a fragmentary top view of the stator of the electric motor of a 10th embodiment. It is the elements on larger scale of the stator of the electric motor of 11th Embodiment. It is a perspective view of the 2nd coil insulation member. It is a figure explaining the operation | movement which inserts the 2nd coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is a partial enlarged view which shows the state before inserting the 2nd coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is the elements on larger scale which show the state which has inserted the 2nd coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is a partial enlarged view which shows the state which inserted the 2nd coil | winding insulation member in the slot of the stator of the electric motor of 1st Embodiment. It is sectional drawing which shows the state which inserted the 2nd insulating member in the slot of the stator of the electric motor of 1st Embodiment. It is the elements on larger scale of the stator of the motor of 12th Embodiment. It is a fragmentary top view of the stator of the motor of a 12th embodiment.

Embodiments of an electric motor according to the present invention will be described below with reference to the drawings.
The electric motor according to each embodiment described below includes a stator and a rotor that is rotatably supported with respect to the stator. As the stator, a three-phase six-pole stator having nine slots is formed. Further, as a winding method of the stator winding, a concentrated winding method in which the stator winding is directly wound around the teeth is used.
In the present specification, the “axial direction” indicates the direction of the rotation axis of the rotor, that is, the direction of the rotation center line in a state where the rotor is rotatably supported with respect to the stator. In addition, the “circumferential direction” indicates a circumferential direction centering on the rotation center line when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably supported with respect to the stator. In addition, the “radial direction” indicates a direction perpendicular to the rotation center line as viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably supported with respect to the stator.
In the following, an adder-type electric motor in which the rotor is rotatably supported on the radially inner side of the stator will be described.

An electric motor according to a first embodiment of the present invention will be described. FIG. 1 shows a stator 1 of an electric motor according to a first embodiment. 2 is a partially enlarged view of the II part of FIG. 1, FIG. 3 is a partially enlarged view of the III part of FIG. 1, and FIG. 4 is a partial plan view of the stator 1. FIG.
Although a rotor is not illustrated in FIG. 1, a known rotor is used as the rotor. For example, a rotor having a magnet housing hole and a permanent magnet housed in the magnet housing hole is used. The rotor is supported rotatably with respect to the stator 1. At this time, the rotor, that is, the rotation axis of the rotor rotates about the rotation center line P.
The stator 1 includes a stator core 10, a stator winding 17, an end insulating member 20, a slot insulating member 60, and a winding insulating member. In the present embodiment, the stator winding 17 is not shown for easy understanding of the configuration of the end insulating member 20. The stator winding 17 is shown in FIGS. The winding insulation member will be described later.

The stator core 10 is configured by laminating thin electromagnetic steel plates in the axial direction and integrating them with an auto clamp or the like.
As shown in FIGS. 10 and 27, the stator core 10 includes a yoke 11 and a plurality of teeth 12. The yoke 11 extends along the circumferential direction when viewed in a cross section perpendicular to the axial direction. In the present embodiment, the yoke 11 is formed in an annular shape (including a substantially annular shape). The teeth 12 have a tooth base portion 13 extending radially inward from the yoke and a tooth tip portion 14 provided along the circumferential direction and extending along the circumferential direction when viewed in a cross section perpendicular to the axial direction. Have.
In the tooth tip portion 14, a tooth tip surface 12 a is formed on the rotor side (in the radial direction in the present embodiment). In the present embodiment, tooth tip surface 12a is formed in an arc shape centered on the rotor center as seen in a cross section perpendicular to the axial direction. The rotor is rotatably supported so as to have a gap between the outer peripheral surface of the rotor and the tooth tip surface 12a in the rotor housing space 16 formed by the tooth tip surface 12a.
A slot 15 is formed by the yoke 11 and two teeth 12 adjacent to each other in the circumferential direction among the plurality of teeth 12. The slot 15 has a slot opening 15a between the tooth tips 14 of the two adjacent teeth 12 (between the circumferential end surfaces 14a of the teeth tip 14).
The stator core 10 has axial end faces 10a (see FIG. 2) on both axial sides.

  A slot insulating member 60 is provided in the slot 15. In the present embodiment, a slot insulating member 60 having elasticity and formed in a sheet shape (film shape) is disposed in the slot 15. The slot insulating member 60 is made of, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like. The stator winding 17 is wound by the concentrated winding method with the slot insulating member 60 provided in the slot 15. That is, the stator winding 17 is disposed in the slot 15 via the slot insulating member 60. In the present embodiment, adjacent stator windings 17 are arranged in the same slot 15. In the present embodiment, since the sheet-like slot insulating member 60 is used, the area of the cross section perpendicular to the axial direction of the slot 15 can be increased, and many stator windings can be wound.

The end insulating members 20 are provided on both sides of the stator core 10 in the axial direction (positions facing the axial end surface 10a). In the present embodiment, the end insulating member 20 is formed of, for example, polyethylene sulfide (PPS), polybutylene terephthalate (PBT), liquid crystal polymer (LCP), or the like.
The end insulating member 20 includes a first member 30 disposed at a position facing the tooth tip 14 of the tooth 12, a second member 40 disposed at a position facing the yoke 11, and the tooth base 13 of the tooth 12. And a connecting member 50 that connects the first member 30 and the second member 40 to each other. In the present embodiment, the first member 30 is disposed along the circumferential direction as viewed in a cross section perpendicular to the axial direction (the end insulating member 20 is opposed to the axial end surface 10a of the stator core 10). In this state, it extends along the tooth tip 14. Further, the second member 40 is viewed along a cross section perpendicular to the axial direction, along the circumferential direction (in a state where the end insulating member 20 is disposed so as to face the axial end surface 10a of the stator core 10, It extends along the yoke 11 of the stator core 10). Further, the connecting member 50 is viewed along a cross section perpendicular to the axial direction, along the radial direction (in the state where the end insulating member 20 is disposed so as to face the axial end surface 10a of the stator core 10, the teeth base portion 13). The first member 30 and the second member 40 extend along the axial direction. In the state where the end insulating member 20 is disposed so as to face the axial end surface 10a of the stator core 10, the rotor-side surface of the first member 30 (in this embodiment, the radially inner surface) It is preferable that the surface (inner peripheral surface) 30a does not protrude from the teeth tip surface 12a to the rotor side (in the present embodiment, radially inward). The connecting portion 50 of the end insulating member 20 is used when the stator winding 17 is wound by the concentrated winding method.

  Further, at least one of the end insulating members 20 includes a guide portion for facilitating the operation of inserting the winding insulating member into the slot 15 in the first member 30, and a winding insulating member (details will be described later). Is provided with a step portion 31 for preventing it from slipping out of the slot 15 in the axial direction. In the present embodiment, a notch 32 having a shape in which a rotor-side portion (in the present embodiment, a radially inner portion) of the circumferential end of the first member is used as the guide portion. It has been. When the direction in which the winding insulating member is easily removed from the slot 15 is known, the stepped portion 31 and the notch (guide portion) are provided on the end insulating member 20 disposed in the direction in which the winding insulating member is not easily removed. ) 32, and the winding insulating member is preferably inserted into the slot 15 using the notch (guide portion) 32 provided in the end insulating member 20. Of course, the step part 31 and the notch part (guide part) 32 may be provided on the end insulating member 20 arranged on both sides in the axial direction of the stator core 10.

The step part 31 and the notch part (guide part) 32 of this Embodiment are demonstrated with reference to the elements on larger scale of FIG. 2 and FIG.
The first member 30 is divided along the circumferential direction into a circumferential central portion 30A and circumferential end portions 30B on both circumferential sides of the circumferential central portion 30A.
The step portion 31 has a portion of the circumferential end portion 30B of the first member 30 facing the axial end surface 10a of the stator core 10 on the slot opening 15a side (the first member 30 adjacent in the circumferential direction). It has a shape cut out along the circumferential direction from the opposite side. That is, the step portion 31 is open on the radially inner side and the outer side and on the slot opening 15a side. The step portion 31 is formed by step portion forming surfaces 31a and 31b. The step portion forming surface 31a faces the slot opening 15a side, and the step portion forming surface 31b faces the axial end surface 10a side of the stator core 10. As will be described later, the end portion of the winding insulating member inserted into the slot 15 is locked to the stepped portion forming surface 31b in order to prevent the winding insulating member from protruding from the slot 15. For this reason, it is preferable to form the stepped portion forming surface 31b parallel to (including substantially parallel to) the axial end surface 10a of the stator core 10.
The notch 32 acting as a guide portion communicates the step portion 31 with the rotor-side portion (in this embodiment, the radially inner portion) of the circumferential end 30B of the first member. The circumferential end 30B has a shape cut out through the axial direction. That is, the notch 32 is opened on the radially inner side (rotor side), both axial sides, and the slot opening 15a side. The notch 32 is formed by notch forming surfaces 32a and 32b. The notch forming surface 32a faces the slot opening 15a side, and the notch forming surface 32b faces the radially inner side (rotor side).

  The second member 40 is provided with a convex portion 41 and a concave portion 42 in order to lock the end portion of the stator winding 17 or to draw out the lead wire. That is, the lead wire that is the end portion of the stator winding 17 that is directly wound around the connecting portion 50 of the tooth 12 and the end insulating member 20 is drawn from the concave portion 42 to the outer peripheral side of the second member 40, and the convex portion 41. Locked in. Thereby, it is possible to prevent the lead wires from contacting each other to cause insulation failure.

Furthermore, in this embodiment, in order to prevent insulation failure from occurring at the boundary between the stator core 10 and the end insulating member 20, the slot insulating member 60 is provided with the axial end surface 10a of the stator core 10. Protrudes in the axial direction. The protruding length of the slot insulating member 60 is set in the range of 2 mm to 4 mm in consideration of the insulating distance between the stator winding 17 and the stator core 10.
Further, as will be described later, in the present embodiment, the winding insulating member inserted into the slot 15 has its axial end locked to the stepped portion forming surface 31b in order to prevent the winding insulating member from jumping out of the slot 15. Is done. For this reason, the length in the axial direction of the stepped portion 31 (the length in the axial direction of the stepped portion forming surface 31a) is set slightly longer than the protruding length from the axial end surface 10a of the slot insulating member 60. In the present embodiment, the axial length of the step portion 31 is set to be approximately 0 mm to 0.5 mm longer than the protruding length of the slot insulating member 60. Thereby, even when the slot insulating member 60 moves in the axial direction, the stator winding 17 and the stator core 10 can be reliably insulated.

Next, the winding insulation member inserted into the slot 15 will be described.
FIG. 5 shows the first winding insulating member 70. As the first winding insulating member 70, an insulating member having elasticity and formed in a sheet shape (film shape) is used. The first winding insulating member 70 has body portions 71a and 71b bent so as to have a V shape (including a substantially V shape) when viewed in a cross section perpendicular to the axial direction. Moreover, the circumferential direction both ends 72a and 72b are bent to the opposite side to the V-shaped opening. That is, the first winding insulating member 70 is viewed from a cross section perpendicular to the axial direction, and is bent from the main body portions 71a and 71b into a V shape (including a substantially V shape) and from the main body portions 71a and 71bb. The bent portions 72a and 72b are bent.

The operation of inserting the first winding insulation member 70 into the slot 15 of the stator core 10 will be described with reference to FIGS. FIG. 6 is a perspective view showing the operation of inserting the first winding insulating member 70 into the slot 15. 7 to 9 are partial enlarged views showing a state before the first winding insulating member 70 is inserted into the slot 15, an inserted state, and an inserted state, respectively.
When the first winding insulating member 70 is inserted into the slot 15, an external force is applied and elastically deformed so that the distance between the circumferential ends is shortened. For example, the cross-sectional shape perpendicular to the axial direction is a T-shape. Next, as shown in FIG. 7, the folded portions 72 a and 72 b on both ends in the circumferential direction are arranged at the positions of the notches (guide portions) 32, and the main body portions 71 a and 71 b are connected using the connecting portion 50. It arrange | positions between the stator coil | windings 17 each wound directly on the adjacent teeth 12. FIG. In this state, the first winding insulating member 70 is moved in the axial direction. At this time, the first member 30 is moved along the cutout portion 32 (along the cutout portion forming surfaces 32a and 32b forming the cutout portion 32). Moreover, the space | interval (space | interval between the circumferential direction both ends) between the main-body parts 71a and 71b is the space | interval of the circumferential direction edge part of the 1st member 30 adjacent to the circumferential direction, or the notch of the 1st member 30 It is limited by the interval between the part forming surfaces 32.
The folded portions 72a and 72b at both ends in the circumferential direction of the first winding insulating member 70 may be inserted between the slot insulating member 60 and the stator winding 17 disposed in the slot 15, You may insert between the slot insulation member 60 and the teeth front-end | tip part 14. FIG. In the present embodiment, the folded portions 72 a and 72 b at both ends in the circumferential direction of the first winding insulating member 70 are inserted between the slot insulating member 60 and the stator winding 17 disposed in the slot 15. ing.
Here, in the present embodiment, since the slot insulating member 60 protrudes in the axial direction from the axial end face 10a of the stator core 10, the bent portion (circumferential end) of the first winding insulating member 70. 72 a and 72 b can be easily positioned between the slot insulating member 60 and the stator winding 17.
When the first winding insulating member 70 is inserted into the slot 15 (when the first winding insulating member 70 passes through the notch 32), the circumferential end portion or notch forming surface of the first member 30 The restriction by 32a is released, and the space between both ends in the circumferential direction of the first winding insulating member 70 is widened by the elastic restoring force (the cross-sectional shape perpendicular to the axial direction returns to a V shape). Then, the axial end portion 73 a of the first winding insulating member 70 is locked to the step portion forming surface 31 b that forms the step portion 31 of the first member 30. The length of the first winding insulation member 70 in the axial direction is fixed so that the axial end of the first winding insulation member 70 protrudes in the axial direction from the axial end surface 10a of the stator core 10. It is set longer than the axial length of the child core 10.
FIG. 10 is a partial cross-sectional view showing a state in which the first winding insulating member 70 is inserted into the slot 15.

When the first winding member 70 is inserted into the slot 15, the V-shaped opening is disposed so as to face the slot opening 15a. As a result, the slot opening 15a is closed by the first winding insulating member 70, and therefore the stator winding 17 disposed in the slot 15 is moved from the slot opening 15a to the rotor side (in this embodiment). , It can be prevented from jumping out (inward in the radial direction). Further, the main body portions 71 a and 71 b are arranged between the adjacent stator windings 17 in the slot 15. Thereby, it is possible to prevent the occurrence of insulation failure between the adjacent stator windings 17 in the slot 15.
In the present embodiment, a notch 32 formed in the axial direction is provided as a guide at the circumferential end of the first member 30 of the end insulating member 20. Thereby, the first winding insulating member 70 can be easily inserted into the slot 15. In the present embodiment, since the notch 32 is formed by notching a portion on the rotor side (in the present embodiment, radially inner side) of the circumferential end of the first member 30, The first winding insulating member 70 is easily inserted through the notch 32 from the side where the end insulating member 20 is disposed and the rotor side (in the radial direction in the present embodiment). be able to.
In addition, the circumferential end portion of the first member 30 of the end insulating member 20 has a shape in which a portion on the axial end face 10a side of the stator core 10 is cut out from the slot opening 15a side along the circumferential direction. A step portion is provided. As a result, the axial end 73a of the first winding insulating member 70 inserted into the slot 15 is locked to the step portion 31 (step portion forming surface 31b). It is possible to prevent 70 from coming off in the axial direction.

In order to facilitate the insertion of the first winding insulating member 70 into the slot 15, the widths A and B shown in FIGS. 3 and 4 are preferably set as follows.
Here, the width A is a radial width at the circumferential tip of the tooth tip 14. Further, the width B is a circumferential tip position of the circumferential end portion of the first member 30 and the circumference of the tooth tip surface 12 a and the first member 30 at the axial end surface 10 a side of the stator core 10. The width in the radial direction between the rotor-side surface (in the present embodiment, the radially inner surface) in FIG. 3 (the notch forming surface 32b in FIG. 3). And it is preferable to set so that [A <= B] may be satisfied. More preferably, it is set so as to satisfy [(A + thickness of slot insulating member 60) ≦ B].
When configured in this manner, the bent portions 72a and 72b of the first winding member 70 are moved along the notch portion forming surface 32b, so that even the first winding insulating member 70 that is thin and easily bent can be bent. 72 a and 72 b can be easily inserted between the slot insulating member 60 and the stator winding 17.

This embodiment is
“The step portion 31 is formed by the first and second step portion forming surfaces (31a and 31b),
The first stepped portion forming surface 31a faces the opening 15a side of the slot,
The second stepped portion forming surface 31b faces the axial end surface 10a side of the stator core 10,
The guide portion 32 has a shape in which a portion on the rotor side of the circumferential end portion of the first member 30 is cut out so as to penetrate along the axial direction, and the first and second portions Formed by the guide portion forming surfaces (notch portion forming surfaces 32a and 32b),
The first guide portion forming surface 32a faces the opening 15a side of the slot,
The second guide portion forming surface 32b faces the rotor side. "
It can be configured as an electric motor.

  The end insulating members disposed on both sides in the axial direction of the stator core 10 are not limited to the configurations shown in FIGS. Below, the electric motor of the 2nd-9th embodiment is demonstrated. The electric motors of the second to ninth embodiments are different from the electric motor of the first embodiment in the configuration of the notch portion of the first member of the end insulating member.

FIG. 11 shows a partially enlarged view of the stator of the electric motor according to the second embodiment.
In the electric motor according to the present embodiment, the stepped portion 131 of the first member 130 is fixed to the stepped portion forming surface 131a facing the slot opening 15a side in the same manner as the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 131b that faces the axial end surface 10a side of the child core 10.
Further, the notch 132 acting as a guide is open on the rotor side (in the radial direction in the present embodiment), on both sides in the axial direction, and on the slot opening 15a side, and the circumferential end of the first member 130 The part is penetrated along the axial direction. The notch 132 is formed by notch forming surfaces 132a and 132b. The notch forming surface 132a faces the slot opening 15a side, and the notch forming surface 132b faces the rotor side (in the radial direction in the present embodiment). Further, the notch portion forming surface 132a is formed with a tapered surface 133 at a position on the axial end surface 10a side of the stator core 10 on the circumferential front end side.
When the stator winding 17 disposed in the slot 15 is damaged, the stator winding 17 is removed from the slot 15. At this time, if the stator winding 17 is caught by the corner portion on the slot opening 15a side of the step portion 131 (step portion forming surface 131b forming the step portion 131) of the first member 130, the stator winding 17 This will interfere with the removal work. In the present embodiment, since the tapered surface 133 is formed at a position on the axial end surface 10a side of the stator core 10 on the circumferential front end side of the notch forming surface 132b, the stator winding 17 is removed from the slot 15. When taking out, it can prevent that the stator coil | winding 17 is caught in the level | step-difference part 131 of the 1st member 130, and is damaged. As a result, the effects of the first embodiment are obtained, and the stator winding 17 can be easily removed from the slot 15.

This embodiment is
“The guide portion 132 has a shape in which the rotor-side portion of the circumferential end portion of the first member 130 is cut out so as to penetrate along the axial direction. Formed by the guide portion forming surface (notch portion forming surfaces 132a and 132b),
The first guide portion forming surface 132a faces the opening 15a side of the slot,
The second guide portion forming surface 132b faces the rotor side, and a tapered surface 133 is formed at a position on the axial end surface 10a side of the stator core 10 on the circumferential front end side.
It can be configured as an electric motor.

FIG. 12 shows a partially enlarged view of the stator of the motor according to the third embodiment.
In the electric motor according to the present embodiment, the stepped portion 231 of the first member 230 is fixed to the stepped portion forming surface 231a facing the slot opening 15a side in the same manner as the stepped portion 31 of the first embodiment. It is formed by the step part forming surface 231b facing the axial end surface 10a side of the child core 10.
In addition, the notch portion 232 that acts as a guide portion opens on the rotor side (in the radial direction in the present embodiment), on both sides in the axial direction, and on the slot opening portion 15a side, and ends in the circumferential direction of the first member 230. The part is penetrated along the axial direction. The notch 232 is formed by notch forming surfaces 232a, 232b and 232c. The notch forming surface 232a faces the slot opening 15a side, and the notch forming surfaces 232b and 232c face the rotor side (in the radial direction in the present embodiment). Further, the notch portion forming surface 232c has a cross section perpendicular to the circumferential direction, and the axial end surface 10a side of the stator core 10 is opposite to the rotor from the notch portion forming surface 232b side (in the present embodiment, the radial direction). It is inclined to be located outside.
In the present embodiment, the insertion position of the first winding insulating member 70 in the slot 15 is set not only from the side where the end insulating member is disposed, but also on the rotor side (in this embodiment, on the radially inner side). ). Thereby, the first winding insulating member 70 can be more reliably inserted into the slot 15. Further, since the notch forming surface 232c on the axial end surface 10a side of the stator core 10 is inclined among the notch forming surfaces of the first member 230, the bent portions 72a of the first winding insulating member 70, By moving 72b along the notch forming surface 232c, the bent portions 72a and 72b of the first winding insulating member 70 can be more reliably inserted between the slot insulating member 60 and the stator winding 17. .

This embodiment is
“The guide portion 232 has a shape in which the rotor-side portion of the circumferential end portion of the first member 230 is cut out so as to penetrate along the axial direction. And a third guide portion forming surface (notch portion forming surfaces 232a, 232b and 232c),
The first guide portion forming surface 232a faces the opening 15a side of the slot,
The second guide portion forming surface 232b faces the rotor side,
The third guide portion forming surface 232c faces the rotor side and is disposed closer to the axial end surface 10a side of the stator core 10 than the second guide portion forming surface 232b and is perpendicular to the circumferential direction. When viewed in a simple cross section, the axial end surface 10a side of the stator core 10 is positioned on the opposite side of the rotor from the opposite side (second notch forming surface 232b side) of the axial end surface 10a of the stator core 10. It is inclined to
It can be configured as an electric motor.

FIG. 13 shows a partially enlarged view of the stator of the motor according to the fourth embodiment.
In the electric motor of the present embodiment, the stepped portion 331 of the first member 330 is fixed to the stepped portion forming surface 331a facing the slot opening 15a side in the same manner as the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 331b facing the axial end surface 10a side of the child core 10.
Further, the notch portion 332 acting as a guide portion opens on the rotor side (in the radial direction in the present embodiment), on both sides in the axial direction, and on the slot opening portion 15a side, and ends in the circumferential direction of the first member 330. The part is penetrated along the axial direction. The notch portion 332 is formed by notch portion forming surfaces 332a, 332b, 332c, and 332d. The notch forming surface 332a faces the slot opening 15a side, and the notch forming surfaces 332b and 332d face the rotor side (in the radial direction in the present embodiment), and the notch forming surface 332c. Faces the axial end surface 10a side of the stator core 10. In the present embodiment, when viewed in a cross section perpendicular to the circumferential direction, the notch forming surface 332d is located on the opposite side to the rotor (in the present embodiment, radially outward) from the notch forming surface 332b.
In the present embodiment, a notch portion forming surface 332c for arranging the notch portion forming surfaces 332b and 332d in a stepped shape is provided. That is, the axial end portion of the first winding insulating member 70 can be locked not only to the step portion forming surface 331 b of the step portion 331 but also to the notch portion forming surface 332 c of the notch portion 332. Thus, the effects of the first embodiment can be obtained, and the first winding insulating member 70 can be prevented from coming out of the slot 15 even when the motor is vibrated vigorously. The first winding insulating member 70 can also be sandwiched between the slot insulating member 60 and the notch forming surface 332d.

This embodiment is
“The guide portion 332 has a shape in which the rotor-side portion of the circumferential end portion of the first member 330 is cut out so as to penetrate along the axial direction. , Formed by third and fourth guide portion forming surfaces (notch portion forming surfaces 332a, 332b, 332c and 332d),
The first guide portion forming surface 332a faces the opening 15a side of the slot,
The second guide portion forming surface 332b faces the rotor side,
The fourth guide portion forming surface 332d faces the rotor side, and is disposed on the side opposite to the rotor on the axial end surface 10a side of the stator core 10 from the second guide portion forming surface 332b. And
The third guide portion forming surface 332c faces the axial end surface 10a side of the stator core 10 and is disposed between the second guide portion forming surface 332b and the fourth guide portion forming surface 332d. "
It can be configured as an electric motor.

FIG. 14 is a partially enlarged view of the stator of the electric motor according to the fifth embodiment.
In the electric motor of the present embodiment, the stepped portion 431 of the first member 430 is fixed to the stepped portion forming surface 431a facing the slot opening 15a side, similarly to the stepped portion 31 of the first embodiment. It is formed by the step part forming surface 431b facing the axial end surface 10a side of the child core 10.
Further, the notch portion 432 acting as a guide portion opens on the rotor side (in the radial direction in the present embodiment), on both sides in the axial direction, and on the slot opening portion 15a side, and ends in the circumferential direction of the first member 430. The part is penetrated along the axial direction. The notch 432 is formed by notch forming surfaces 432a, 432b, and 432c. The notch forming surface 432a faces the slot opening 15a side, the notch forming surface 432b faces the rotor side (in the radial direction in the present embodiment), and the notch forming surface 432c It faces the axial end surface 10a side of the stator core 10. In the present embodiment, the axial length of the notch forming surface 432b is shorter than the axial length of the notch forming surface 432a.
In this embodiment, the effect of the first embodiment is obtained, and the axial length of the notch portion forming surface 432b is shorter than the axial length of the notch portion forming surface 432a. When the wire 17 is taken out from the slot 15, the stator winding 17 can be prevented from being caught and damaged by the step portion 431 of the first member 430. Moreover, since the clearance gap between the axial direction edge part of the slot insulation member 60 and the notch part formation surface 432c opens widely, the 1st coil | winding insulation member 70 can be inserted more easily.

This embodiment is
“The guide portion 432 has a shape in which the rotor-side portion of the circumferential end of the first member 430 is cut out so as to penetrate along the axial direction. And a third guide portion forming surface (notch portion forming surfaces 432a, 432b and 432c),
The first guide portion forming surface 432a faces the opening 15a side of the slot,
The second guide portion forming surface 432b faces the rotor side, and the axial length is set to be shorter than the axial length of the first guide portion forming surface 432a.
The third guide portion forming surface 432c faces the axial end surface 10a side of the stator core 10, and a step portion on the axial end surface 10a side of the stator core 10 from the second guide portion forming surface 432b. 431 (the stepped portion forming surface 431b forming the stepped portion 431) is disposed on the side opposite to the axial end surface 10a of the stator core 10 "
It can be configured as an electric motor.

FIG. 15 is a partially enlarged view of the stator of the electric motor according to the sixth embodiment.
In the electric motor of the present embodiment, the stepped portion 531 of the first member 530 is fixed to the stepped portion forming surface 531a facing the slot opening 15a side, similarly to the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 531b facing the axial end surface 10a side of the child core 10.
Further, the notch portion 532 acting as a guide portion opens on the rotor side (in the radial direction in the present embodiment), on the axial end surface 10a side of the stator core 10, and on the slot opening portion 15a side. The end of the member 530 in the circumferential direction is penetrated along the axial direction. The notch 532 is formed by notch forming surfaces 532a and 532b. The notch forming surface 532a faces the slot opening 15a side, and the notch forming surface 532b faces the rotor side (in the radial direction in the present embodiment). In the present embodiment, when viewed in a cross section perpendicular to the circumferential direction, the notch portion forming surface 532b is configured such that the axial end surface 10a side of the stator core 10 is opposite to the rotor than the opposite side of the axial end surface 10a (this embodiment) In this form, it is inclined so as to be located on the outer side in the radial direction.
In the present embodiment, the insertion position of the first winding insulating member 70 in the slot 15 is set not only from the axial direction side where the end insulating member is disposed, but also on the rotor side (in this embodiment, the diameter It can also be visually observed from the inside in the direction). Thereby, the first winding insulation member 70 can be more reliably inserted into the slot 15. The second notch forming surface 532b of the first member 530 has a side opposite to the rotor from the side opposite to the axial end surface 10a of the stator core 10 on the side of the axial end surface 10a of the stator core 10 (this embodiment). In this form, it is inclined so as to be located on the outer side in the radial direction. Accordingly, the bent portions 72a and 72b (circumferential ends) of the first winding insulating member 70 are moved along the second notch forming surface 532b, whereby the first winding insulating member 70 is bent. The portions 72 a and 72 b can be more reliably inserted between the slot insulating member 60 and the stator winding 17.

This embodiment is
“The guide portion 532 has a shape in which the rotor-side portion of the circumferential end portion of the first member 530 is cut out so as to penetrate along the axial direction. Formed by the guide portion forming surface (notch portion forming surfaces 532a and 532b),
The first guide portion forming surface 532a faces the opening 15a side of the slot,
The second guide portion forming surface 532b faces the rotor side, and the axial end surface 10a side of the stator core 10 is opposite to the axial end surface 10a of the stator core 10 when viewed in a cross section perpendicular to the circumferential direction. It is inclined so that it is located on the opposite side of the rotor. ''
It can be configured as an electric motor.

FIG. 16 shows a partially enlarged view of the stator of the electric motor according to the seventh embodiment.
In the electric motor of the present embodiment, the stepped portion 631 of the first member 630 is fixed to the stepped portion forming surface 631a facing the slot opening 15a side in the same manner as the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 631b facing the axial end surface 10a side of the child core 10.
In addition, the notch 632 acting as a guide is open on the rotor side (in the radial direction in the present embodiment), on the axial end surface 10a side of the stator core 10, and on the slot opening 15a side, The end of the member 630 in the circumferential direction is penetrated along the axial direction. The notch 632 is formed by notch forming surfaces 632a, 632b, and 632c. The notch forming surface 632a faces the slot opening 15a side, and the notch forming surfaces 632b and 632c face the rotor side (in the radial direction in the present embodiment). In the present embodiment, when viewed in a cross section perpendicular to the circumferential direction, the notch portion forming surface 632b has an axial end surface 10a side (notch portion forming surface 632c side) of the stator core 10 from the side opposite to the axial end surface 10a. It inclines so that it may be located on the opposite side to a rotor (in this Embodiment, radial direction outer side).
In the present embodiment, the axial end surface 10a side of the stator core 10 of the notch forming surface 632b opposite to the axial end surface 10a of the stator core 10 is the axial end surface of the stator core 10 among the notch forming surfaces. It inclines so that it may be located in the opposite side (in this Embodiment radial direction outer side) from a rotor from the opposite side to 10a. Thereby, similarly to the sixth embodiment, the bent portions 72a and 72b of the first winding insulating member 70 can be more reliably inserted between the slot insulating member 60 and the stator winding 17. it can.

This embodiment is
“The guide portion 632 has a shape in which the rotor side portion of the circumferential end portion of the first member 630 is cut out so as to penetrate along the axial direction. And a third guide portion forming surface (notch portion forming surfaces 632a, 632b and 632c),
The first guide forming surface 632a faces the opening 15a side of the slot,
The second guide portion forming surface 632b faces the rotor side, and the axial end surface 10a side of the stator core 10 is opposite to the axial end surface 10a of the stator core 10 when viewed in a cross section perpendicular to the circumferential direction. More inclined to be located on the opposite side of the rotor,
The third guide portion forming surface 632c faces the rotor side, and is disposed on the side opposite to the rotor on the axial end surface 10a side of the stator core 10 from the second guide portion forming surface 632b. Is there "
It can be configured as an electric motor.

FIG. 17 is a partially enlarged view of the stator of the electric motor according to the eighth embodiment.
In the electric motor of the present embodiment, the stepped portion 731 of the first member 730 is fixed to the stepped portion forming surface 731a facing the slot opening 15a side, like the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 731b facing the axial end surface 10a side of the child core 10.
Further, the notch 732 acting as a guide portion is open on the rotor side (in the radial direction in the present embodiment), on the axial end surface 10a side of the stator core 10, and on the slot opening 15a side. It is formed in the part along the axial direction of the circumferential direction edge part of this member 730. The notch 732 is formed by notch forming surfaces 732a, 732b and 732c. The notch forming surface 732a faces the slot opening 15a side, the notch forming surface 732b faces the axial end surface 10a side of the stator core 10, and the notch forming surface 732c is on the rotor side ( In the present embodiment, it is directed radially inward). In the present embodiment, the notch 732 is formed in a part along the axial direction of the circumferential end of the first member 730 (a part on the axial end face 10a side of the stator core 10).
In the present embodiment, a notch 732 (notch forming surfaces 732a, 732b, and 732c) is formed in a part along the axial direction of the circumferential end of the first member 730. That is, the notch forming surface includes a notch forming surface 732 b facing the axial end surface 10 a side of the stator core 10. Thus, as in the fourth embodiment, the axial end of the first winding insulating member 70 is not only the stepped portion forming surface 731b of the stepped portion 731 but also the notched portion forming surface 732b of the notched portion 732. Can also be locked. Therefore, even when the vibration of the electric motor is intense, it is possible to prevent the first winding insulating member 70 from coming out of the slot 15. The first winding insulating member 70 can also be sandwiched between the slot insulating member 60 and the notch forming surface 732c.

This embodiment is
“The guide portion 732 has a shape in which the rotor side portion of the circumferential end of the first member 730 is partially cut out along the axial direction, and the first, second, and second portions 3 guide portion forming surfaces (notch portion forming surfaces 732a, 732b and 732c),
The first guide portion forming surface 732a faces the opening 15a side of the slot,
The second guide portion forming surface 732b faces the axial end surface 10a side of the stator core 10,
The third guide portion forming surface 732c faces the rotor side, and is disposed on the side of the axial end surface 10a of the stator core 10 opposite to the rotor from the second guide portion forming surface 732b. Is there "
It can be configured as an electric motor.

FIG. 18 is a partially enlarged view of the stator of the electric motor according to the ninth embodiment.
In the electric motor of the present embodiment, the stepped portion 831 of the first member 830 is fixed to the stepped portion forming surface 831a facing the slot opening 15a side in the same manner as the stepped portion 31 of the first embodiment. It is formed by the step part forming surface 831b facing the axial end surface 10a side of the child core 10.
In addition, the notch portion 832 acting as a guide portion opens on the rotor side (in the radial direction in the present embodiment), on the axial end surface 10a side of the stator core 10, and on the slot opening portion 15a side. It is formed in the part along the axial direction of the circumferential direction edge part of the member 830 of this. The notch 832 is formed by notch forming surfaces 832a, 832b, and 832c. The notch forming surface 832a faces the slot opening 15a side, the notch forming surface 832b faces the axial end surface 10a side of the stator core 10, and the notch forming surface 832c is on the rotor side ( In the present embodiment, it is directed radially inward). In the present embodiment, when viewed in a cross section perpendicular to the circumferential direction, the notch portion forming surface 832c rotates on the axial end surface 10a side of the stator core 10 from the side opposite to the axial end surface 10a (notch portion forming surface 832b side). It inclines so that it may be located on the opposite side (in this Embodiment, radial direction outer side) with a child.
In the present embodiment, a notch portion 832 (notch portion forming surfaces 832 a, 832 b, and 832 c) is formed in a part along the axial direction of the circumferential end portion of the first member 830. That is, the notch portion forming surface includes a notch portion forming surface 832 b facing the axial end surface 10 a side of the stator core 10. Thus, as in the fourth embodiment, the axial end of the first winding insulating member 70 is not only the stepped portion forming surface 831b of the stepped portion 831 but also the notched portion forming surface 832b of the notched portion 832. Can also be locked. Therefore, even when the vibration of the electric motor is intense, it is possible to prevent the first winding insulating member 70 from coming out of the slot 15. Further, the notch forming surface 832c is on the side opposite to the rotor from the side opposite to the axial end surface 10a of the stator core 10 on the axial end surface 10a side of the stator core 10 (in the present embodiment, radially outward). Inclined to be located. Thereby, similarly to the sixth embodiment, the bent portions 72a and 72b of the first winding insulating member 70 can be more reliably inserted between the slot insulating member 60 and the stator winding 17. it can.

This embodiment is
“The guide portion 832 has a shape in which the rotor side portion of the circumferential end portion of the first member 830 is partially cut out along the axial direction, and the first, second, and second portions 3 guide portion forming surfaces (notch portion forming surfaces 832a, 832b and 832c),
The first guide portion forming surface 832a faces the opening 15a side of the slot,
The second guide portion forming surface 832b faces the axial end surface 10a side of the stator core 10,
The third guide portion forming surface 832c faces the rotor side, and is arranged on the opposite side of the rotor on the axial end surface 10a side of the stator core 10 from the second guide portion forming surface 832b. In addition, when viewed in a cross section perpendicular to the circumferential direction, the axial end surface 10a side of the stator core 10 is inclined so as to be positioned on the opposite side of the rotor from the side opposite to the axial end surface 10a of the stator core 10 ".
It can be configured as an electric motor.

In the electric motors of the first to ninth embodiments, the cutout portion acting as the guide portion has a shape in which a portion on the rotor side of the first member of the end insulating member is cut out. The portion of the first member opposite to the rotor may have a shape that is cut away.
FIG. 19 shows a partially enlarged view of the stator of the electric motor according to the tenth embodiment. In the present embodiment, the first member has a cutout portion having a shape in which a portion on the opposite side to the rotor (in the present embodiment, the radially outer side) of the circumferential end portion is cut out.
In the electric motor of the present embodiment, the stepped portion 931 of the first member 930 is fixed to the stepped portion forming surface 931a facing the slot opening 15a side, like the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 931b facing the axial end surface 10a side of the child core 10.
In addition, the notch 933 that acts as a guide portion communicates the step portion 931 with a portion of the end of the first member 930 in the circumferential direction opposite to the rotor (in the present embodiment, radially outward). Thus, it has a shape cut out along the axial direction. That is, the notch 933 is open on the side opposite to the rotor (in the present embodiment, radially outside), on both sides in the axial direction, and on the slot opening 15a side, and the circumferential end of the first member 930 is formed. It penetrates along the axial direction. The notch 933 is formed by notch forming surfaces 933a and 933b. The notch forming surface 933a faces the slot opening 15a side, and the notch forming surface 933b faces the side opposite to the rotor (in the present embodiment, radially outward).

In order to facilitate the insertion of the winding insulation member into the slot 15, the width A and the width C shown in FIGS. 19 and 20 are preferably set as follows.
Here, the width A is a radial width at the circumferential tip of the tooth tip 14. The width C is the circumferential tip of the circumferential end of the first member 930 and the circumference of the tooth tip surface 12a and the first member 930 at the axial end surface 10a side of the stator core 10. This is the radial width between the end of the direction and the surface (in the present embodiment, the radially outer side) opposite to the rotor (in FIG. 19, the notch forming surface 933b). And it is preferable to set so that [A <= C] may be satisfied. More preferably, it is set so as to satisfy [(A + thickness of slot insulating member 60) ≦ C].
In the present embodiment, the first winding insulating member 70 is easily inserted into the slot 15 by moving the bent portions 72a and 72b of the first winding insulating member 70 along the notch forming surface 933b. can do. Further, the insertion position of the first winding insulating member 70 in the slot 15 is not only from the side where the end insulating member 930 is disposed, but also on the side opposite to the rotor (in this embodiment, radially outward). ). Thereby, the first winding insulating member 70 can be easily inserted into the slot 15. Further, since the notch 933 is formed in a shape in which the circumferential end of the first member 930 is notched on the side opposite to the rotor (in the present embodiment, the radially outer side), the inside of the slot 15 Many stator windings 17 can be arranged.

This embodiment is
“The guide portion has a shape in which a portion of the circumferential end portion of the first member 932 opposite to the rotor is cut out so as to penetrate along the axial direction. Formed by the second guide portion forming surface (notch portion forming surfaces 933a and 933b),
The first guide portion forming surface 933a faces the opening 15a side of the slot,
Second guide portion forming surface 933b faces away from the rotor. "
Configured as an electric motor.

FIG. 21 shows a partially enlarged view of the stator of the electric motor according to the eleventh embodiment.
In the electric motor according to the present embodiment, the stepped portion 1031 of the first member 1030 is fixed to the stepped portion forming surface 1031a facing the slot opening 15a side, similarly to the stepped portion 31 of the first embodiment. It is formed by a stepped portion forming surface 1031b facing the axial end surface 10a side of the child core 10.
Further, the notch portion 1033 acting as a guide portion is open on the side opposite to the rotor (in the radial direction in the present embodiment), the axial end surface 10a side of the stator core 10, and the slot opening 15a side. The circumferential end of the first member 1030 is penetrated along the axial direction. The notch 1033 is formed by notch forming surfaces 1033a and 1033b. The notch forming surface 1033a faces the slot opening 15a side, and the notch forming surface 1033b faces the opposite side to the rotor (in the present embodiment, radially outward). In the present embodiment, when viewed in a cross section perpendicular to the circumferential direction, the notch forming surface 1033b is arranged such that the axial end surface 10a side of the stator core 10 is closer to the rotor side (in the present embodiment than the axial end surface 10a). Inclined so as to be located radially inward).
In the present embodiment, the first winding insulating member 70 is easily inserted into the slot 15 by moving the bent portions 72a and 72b of the first winding insulating member 70 along the notch forming surface 1033b. can do. In particular, in this embodiment, the notch forming surface 1033b is inclined so that the axial end surface 10a side of the stator core 10 is disposed on the rotor side from the side opposite to the axial end surface 10a of the stator core 10. Therefore, the first winding insulating member 70 can be inserted into the slot 15 more easily. Further, the insertion position of the first winding insulating member 70 in the slot 15 is not only from the side where the end insulating member is disposed, but also on the side opposite to the rotor (in this embodiment, radially outward). Can also be visually observed. Thereby, the first winding insulating member 70 can be more reliably inserted into the slot 15. Further, the notch 1033 is formed in a shape in which the circumferential end of the first member 1030 is notched on the side opposite to the rotor (in the present embodiment, the radially outer side). Many stator windings 17 can be arranged.

This embodiment is
“The guide portion 1033 has a shape in which a portion of the circumferential end of the first member 1030 opposite to the rotor is cut out so as to penetrate along the axial direction. And a second guide portion forming surface (notch portion forming surfaces 1033a and 1033b),
The first guide portion forming surface 1033a faces the opening 15a side of the slot,
The second guide portion forming surface 1033b faces away from the rotor, and the axial end surface 10a side of the stator core 10 is opposite to the axial end surface 10a of the stator core 10 when viewed in a cross section perpendicular to the circumferential direction. It is inclined to be located on the rotor side from the opposite side. ''
Configured as an electric motor.
In addition, as a notch part of 10th and 11th Embodiment, you may form in part along an axial direction. Moreover, the notch part of an above described shape can also be used.

  Next, the second winding insulation member 80 will be described. FIG. 22 shows the second winding insulation member 80. As the second winding insulating member 80, similarly to the first winding insulating member 70, an insulating member having elasticity and formed in a sheet shape (film shape) is used. The second winding insulating member 80 has a straight line shape (including a substantially straight line shape) when viewed in a cross section perpendicular to the axial direction.

The second winding insulating member 80 is placed in the slot 15 of the stator core 10 where the end insulating members 20 of the first embodiment shown in FIGS. 1 to 3 are arranged on both sides in the axial direction. The inserting operation will be described with reference to FIGS. FIG. 23 is a perspective view showing the operation of inserting the second winding insulation member 80 into the slot 15. 24 to 26 are partial enlarged views showing a state before the second winding insulating member 80 is inserted into the slot 15, a state before being inserted, and a state where it is inserted.
When the second winding insulating member 80 is inserted into the slot 15, the circumferential end portions 81 a and 81 b are arranged at the positions of the notches 32 as shown in FIG. 24. In this state, the second winding insulating member 80 is moved in the axial direction. At this time, the first member 30 is moved along the cutout portion 32 (along the cutout portion forming surfaces 32a and 32b forming the cutout portion 32).
The second winding insulation member 80 may be inserted between the slot insulation member 60 and the stator winding 17 disposed in the slot 15, or between the slot insulation member 60 and the tooth tip 14. It may be inserted. In the present embodiment, the second winding insulation member 80 is inserted between the slot insulation member 60 and the stator winding 17 disposed in the slot 15.
In the present embodiment, as described above, since the slot insulating member 60 protrudes in the axial direction from the axial end surface 10a of the stator core 10, the axial end portion 82a of the second winding insulating member 80 is formed. Positioning can be easily performed between the slot insulating member 60 and the stator winding 17.
When the second winding insulating member 80 is inserted into the slot 15 (when the second winding insulating member 80 passes through the notch 32), the axial end portion 82a of the second winding insulating member 80 is The first member 30 is engaged with a stepped portion forming surface 31b that forms the stepped portion 31 of the first member 30. The axial length of the second winding insulating member 80 is such that the axial end portion 82a of the second winding insulating member 80 protrudes in the axial direction from the axial end surface 10a of the stator core 10. It is set longer than the axial length of the stator core 10.
FIG. 27 is a partial cross-sectional view showing a state in which the second winding insulating member 80 is inserted into the slot 15.

When the second winding insulating member 80 is inserted into the slot 15, the second winding insulating member 80 is disposed so as to face the slot opening 15a. As a result, the slot opening 15a is blocked by the second winding insulating member 80, and therefore the stator winding 17 disposed in the slot 15 is moved from the slot opening 15a to the rotor side (in this embodiment). , It can be prevented from jumping out (inward in the radial direction).
In the present embodiment, a notch 32 formed in the axial direction is provided as a guide at the circumferential end of the first member 30 of the end insulating member 20. Thereby, the second winding insulating member 80 can be easily inserted into the slot 15. In the present embodiment, since the first member 30 has a cutout portion 32 having a shape obtained by cutting out a portion on the rotor side (in the radial direction in the present embodiment) of the circumferential end portion, the slot is provided. 15 is inserted not only from the side where the end insulating member 20 is disposed through the notch 32 but also on the rotor side (in the radial direction in the present embodiment). Can be easily observed.
Further, a step having a shape in which the axial end surface 10a side portion of the stator core 10 is cut out from the slot opening 15a side along the circumferential direction at the circumferential end portion of the first member 30 of the end insulating member 20. Has a part. Thereby, since the axial direction edge part of the 2nd coil | winding insulation member 80 inserted in the slot 15 is latched by the level | step-difference part, it prevents that the 2nd coil | winding insulation member 80 slips out in an axial direction. can do.
The second winding insulation member 80 can also be used as a winding insulation member for the electric motors of the second to eleventh embodiments. In this case, the above-described effects are obtained except for the effects caused by the difference in shape between the first winding insulating member 70 and the second winding insulating member 80.

In the first to eleventh embodiments, a portion on one side in the radial direction (a portion on the rotor side or a portion on the opposite side of the rotor) of the circumferential end portion of the first member of the end insulating member is cut. Although the cut-out portion having the cut shape is used as the guide portion, a groove formed in the first member of the end insulating member can also be used as the guide portion.
FIG. 28 shows a partial cross-sectional view of a twelfth embodiment stator using grooves as guide portions.
In the electric motor according to the present embodiment, the step portion 1131 of the first member 1130 is fixed to the step portion forming surface 1131a facing the slot opening 15a side in the same manner as the step portion 31 of the first embodiment. It is formed by a stepped portion forming surface 1131b facing the axial end surface 10a side of the child core 10.
Further, the groove 1134 acting as a guide part is open on both sides in the axial direction and on the slot opening 15a side, and penetrates the circumferential end of the first member 1130 along the axial direction. The groove 1134 is formed by groove forming surfaces 1134a, 1134b, and 1134c. The groove forming surface 1134a faces the side opposite to the rotor (in this embodiment, radially outward), and the groove forming surface 1134b faces the rotor side (in this embodiment, radially inside). The groove forming surface 1134c faces the slot opening 15a side.

In order to facilitate the insertion of the winding insulating members (the first winding insulating member 70 and the second winding insulating member 80) into the slot 15, FIG. 28 and FIG. 29 are shown. It is preferable to set the width A and the width D as follows.
Here, the width A is a radial width at the circumferential tip of the tooth tip 14. Further, the width D is the surface of the circumferential end portion of the first member 1130 that forms the groove 1134 with the tooth distal end surface 12a at the axial end surface 10a side of the stator core 10. Of these, the width in the radial direction between the surface 1134a on the rotor side (in the radial direction in the present embodiment). And it is preferable to set so that [A <= D] may be satisfied. More preferably, it is set so as to satisfy [(A + thickness of slot insulating member 60) ≦ D].
When configured in this way, the winding insulating member is thin and easily bent by moving the circumferential end of the winding insulating member along the groove 1134 (groove forming surfaces 1134a and 1134b forming the groove). 1134 (groove forming surfaces 1134a and 1134b) can be easily inserted into the slot 15 as a guide portion, and can be easily positioned between the slot insulating member 60 and the stator winding 17.

In the present embodiment, the bent portions 72 a and 72 b (circumferential end portions 81 a and 81 b of the second winding insulating member 80) that are circumferential end portions of the first winding insulating member 70 are used as the first member 1130. In the state of being inserted into the groove 1134, the first winding insulating member 70 (second winding insulating member 80) is moved along the groove 1134 (groove forming surfaces 1134a and 134b forming the groove 1134). When the first winding insulating member 70 (second winding insulating member 80) is inserted into the slot 15 (when the circumferential end passes through the groove 1134), the axis of the first winding insulating member 70 The direction end portion 73a (the axial end portion 82a of the second winding insulating member 80) is locked to the step portion 1131 (step portion forming surface 1131b forming the step portion 1131) of the first member 1130.
Note that when the first winding insulating member 70 is inserted into the slot 15, the interval between both ends in the circumferential direction of the first winding insulating member 70 is shortened (the V-shaped opening is closed). As well) may be elastically deformed.
The groove 1134 may be parallel (including substantially parallel) to the axial direction as viewed in a cross section perpendicular to the circumferential direction, or may be inclined with respect to the axial direction, for example, a cross section perpendicular to the circumferential direction. Accordingly, the stator core 10 is inclined so that the axial end surface 10a side is located on the opposite side to the rotor (in the radial direction in the present embodiment) from the side opposite to the axial end surface 10a of the stator core 10. You may do it.

This embodiment is
“The guide portion 1134 is a groove formed in the circumferential end portion of the first member 1130 and penetrating along the axial direction. The first, second, and third guide portion forming surfaces (groove formation Formed by surfaces 1134a, 1134b and 1134c),
The first guide portion forming surface 1134a faces away from the rotor,
The second guide portion forming surface 1134b faces the rotor side,
The third guide portion forming surface 1134c faces the opening 15a side of the slot and is disposed between the first guide portion forming surface 1134a and the second guide portion forming surface 1134b.
Configured as an electric motor.

  As described above, in the electric motor of the present invention, workability can be greatly improved and the occurrence of insulation failure can be prevented.

In addition, each structure demonstrated in the above embodiment is not limited to the inversion motor in which the rotor is rotatably supported inside the stator in the radial direction, and the rotor rotates outside in the radial direction of the stator. It can also be used for an abduction type motor that is supported.
In the abduction motor, the teeth are provided at the tooth base extending radially outward from the yoke and at the tip of the teeth base, extending along the circumferential direction, and on the rotor side (in this case, the radial direction). It has a tooth front end portion in which a tooth front end surface is formed on the outer side. The tooth tip surface is formed in an arc shape centered on the rotor center as seen in a cross section perpendicular to the axial direction. Further, the rotor is rotatably supported on the radially outer side of the stator so as to have a gap between the inner peripheral surface of the rotor and the tip end surface of the teeth. Further, in the abduction motor, the “rotor side” corresponds to the “radially outer side”, and the “opposite side of the rotor” corresponds to the “radially inner side”.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
For example, each configuration described in each embodiment can be used alone, or a plurality of appropriately selected configurations can be used in combination.
Further, when inserting the winding insulating member into the slot, the winding insulating member may be inserted in an elastically deformed state so that the length of both ends in the circumferential direction is shortened, or may be inserted as it is.
Although the axial length of the slot insulating member is set longer than the axial length of the stator core, it may be set to the same (including substantially the same) length.
Further, the notch forming surface 232c of the third embodiment (FIG. 12), the notch forming surface 532b of the sixth embodiment (FIG. 15), and the notch forming of the seventh embodiment (FIG. 16). The surface 632b, the notch formation surface 832c of the ninth embodiment (FIG. 18), and the notch formation surface 1033b of the eleventh embodiment (FIG. 21) can be formed in a planar shape or a curved shape. It can also be formed.
Further, although the step portion having a shape penetrating in the radial direction is used, a step portion having a shape in which a portion on one side in the radial direction is cut out may be used. For example, the portion on the rotor side (radially inner side for an inward motor, radially outer side for an outer motor) or the opposite side of the rotor (radially outer side for an internal motor, radially inner side for an outer motor) ) Can be used which has a shape that is cut out in the circumferential direction.
Further, the end insulating member is not limited to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Stator 10 ... Stator core 10a ... Axial direction end surface 11 ... Yoke 12 ... Teeth 12a ... Teeth tip surface 13 ... Teeth base 14 ... Teeth tip 14a ... Circumferential end surface 15 ... Slot 15a ... Slot opening 16 ... Rotation Child accommodating space 17 ... Stator winding 20 ... End insulating members 30, 130, 230, 330, 430, 530, 630, 730, 830, 930, 1030, 1130 ... First member 30A ... Central portion 30B ... Circumference Directional end 30a ... inner peripheral surface 30b ... outer peripheral surfaces 31, 131, 231, 331, 431, 531, 631, 731, 831, 931, 1031, 1131 ... stepped portions 31a, 31b, 131a, 131b, 231a, 231b, 331a, 331b, 431a, 431b, 531a, 531b, 631a, 631b, 731a, 731b, 31a, 831b, 931a, 931b, 1031a, 1031b, 1131a, 1131b ... stepped portion forming surface 32,132,232,332,432,532,632,732,832,933,1033 ... notch (guide portion)
32a, 32b, 132a, 132b, 232a, 232b, 232c, 332a, 332b, 332c, 332d, 432a, 432b, 432c, 532a, 532b, 632a, 632b, 632c, 732a, 732b, 732c, 832a, 832b, 832c, 933a, 933b, 1033a, 1033b ... notch forming surface (guide forming surface)
40 ... 2nd member 41 ... Convex part 42 ... Concave part 50 ... Connection member 60 ... Slot insulation member 70 ... 1st coil | winding insulation member 71a, 71b ... Main-body part 72a, 72b ... Bending part 73a ... Axial direction edge part 80 ... second winding insulation members 81a, 81b ... circumferential end portion 82a ... axial end portion 133 ... tapered surface 1134 ... groove (guide portion)
1134a, 1134b, 1134c ... groove forming surface (guide portion forming surface)

Claims (11)

An electric motor including a stator and a rotor,
The stator has a stator core, a slot insulating member, a stator winding, a winding insulating member, and an end insulating member;
The stator core is seen in a cross section perpendicular to the axial direction,
A yoke extending along the circumferential direction;
A tooth base extending in the radial direction from the yoke, and a tooth tip provided on the tip side of the teeth base, extending in the circumferential direction and having a tooth tip surface formed on the opposite side of the yoke A plurality of teeth having a section;
It is formed by two teeth adjacent in the circumferential direction among the yoke and the plurality of teeth, and has a slot opened between the teeth tip portions of the two teeth.
The rotor is rotatably supported so as to have a gap between the teeth tip surface,
The stator winding is disposed in the slot via the slot insulating member,
The winding insulating member is inserted into the slot in a state in which both ends in the circumferential direction are sandwiched between the stator winding disposed in the slot and the teeth so as to block at least the opening of the slot. Has been
The end insulating member is provided on both axial sides of the stator core,
Each of the end insulating members is disposed at a position facing the tooth tip of the teeth, and extends in a circumferential direction. The second member is disposed at a position facing the yoke. A member and a connecting member that is disposed at a position facing the teeth base of the tooth and connects the first member and the second member;
In addition, at least one of the end insulating members has portions facing the axial end surface of the stator core at both ends in the circumferential direction of the first member along the circumferential direction from the opening side of the slot. A notched step portion and a guide portion formed along the axial direction so as to communicate with the step portion are provided,
The winding insulating member is guided by the guide portion of the first member and is inserted into the slot, and is fixed in the slot by a step portion of the first member. . The electric motor according to claim 1,
The electric motor according to claim 1, wherein the slot insulating member protrudes from an axial end surface of the stator core. The electric motor according to claim 1 or 2,
The winding insulating member is bent in a V shape when viewed in a cross section perpendicular to the axial direction, and is inserted into the slot so that the V-shaped opening is opposed to the opening of the slot. An electric motor characterized by The electric motor according to claim 3,
The winding insulating member is an electric motor characterized in that both end portions in the circumferential direction are bent to the opposite side to the V-shaped opening when viewed in a cross section perpendicular to the axial direction. The electric motor according to claim 1 or 2,
The motor according to claim 1, wherein the winding insulating member is formed in a straight line when viewed in a cross section perpendicular to the axial direction. The electric motor according to any one of claims 1 to 5,
The electric motor according to claim 1, wherein the guide part is a notch part having a shape in which at least a part of a rotor side of both end parts in the circumferential direction of the first member is notched along the axial direction. The electric motor according to claim 6,
A radial width at a circumferential tip portion of the tooth tip portion is A, and the teeth at a circumferential tip portion of the circumferential end portion of the first member and on the axial end surface side of the stator core. When the radial width between the tip surface and the circumferential end of the first member on the rotor side surface is B, [A ≦ B] is satisfied. An electric motor characterized by The electric motor according to any one of claims 1 to 5,
The electric motor according to claim 1, wherein the guide portion is a notch portion having a shape in which at least a part of the opposite end portion of the first member in the circumferential direction is notched along the axial direction. . The electric motor according to claim 8,
A radial width at a circumferential tip portion of the tooth tip portion is A, and the teeth at a circumferential tip portion of the circumferential end portion of the first member and on the axial end surface side of the stator core. When the radial width between the tip surface and the circumferential end of the first member on the surface opposite to the rotor is C, [A ≦ C] is satisfied. An electric motor characterized by The electric motor according to any one of claims 1 to 5,
The electric motor according to claim 1, wherein the guide portion is a groove formed along an axial direction at an end portion in a circumferential direction of the first member. The electric motor according to claim 10,
A radial width at a circumferential tip portion of the tooth tip portion is A, and the teeth at a circumferential tip portion of the circumferential end portion of the first member and on the axial end surface side of the stator core. When the radial width between the front end surface and the rotor-side surface among the surfaces forming the groove is D, [A ≦ D] is satisfied. Electric motor.

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