JP2021002900A - Stator of rotary electric machine and rotary electric machine - Google Patents

Abstract

To secure a clearance between systems.SOLUTION: A stator comprises: a first system winding and a second system winding, which are constituted of a plurality of segment coils and can independently be electrified; a stator core where a plurality of slots for storing the first system winding and the second system winding is formed; and insulation members arranged on coil end faces of the stator core. The insulation member comprises: penetration parts which are formed to be arrayed in a circumferential direction in positions opposing the respective slots, and through which the first system winding and the second system winding are inserted; and bridge parts for partitioning the first system winding and the second system winding in the penetration parts.SELECTED DRAWING: Figure 7

Description

The present invention relates to a stator of a rotary electric machine.

The following prior arts are the background technologies in this technical field. In Patent Document 1 (Japanese Unexamined Patent Publication No. 2013-208033), an armature iron core provided with a plurality of slots in the circumferential direction, an armature winding inserted into the slot and wound around the armature core, and an armature It is provided with an insulator that insulates the iron core and the armature winding, and the insulator is a first bent insulator formed by bending an insulating plate having a width corresponding to the depth of the slot, and a second insulator having an equivalent shape. It is formed by combining bent insulators, forming slits for this combination, and by fitting each slit together, it has a width corresponding to the depth of the slot and these insulators cooperate in the slot. Described is an armature of a rotating electric wire in which adjacent electric wires to be inserted into a slot are insulated from each other and an individual electric wire accommodating space is formed according to the number of electric wires to be inserted into the slot.

Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2015-19505), the rotary electric machine stator is formed by forming an annular stator core having a plurality of slots arranged along the inner circumference in accordance with the arrangement positions of the plurality of slots. The coil fixing member includes a resin coil fixing member arranged on the axial end surface of the stator core and a coil inserted into the slot through the through grooves of the coil fixing member. , A rotary electric machine including a flat surface portion, a close contact portion in which the inner wall surface of the through groove is in close contact with the outer wall surface of the coil, and an intrusion portion invading the gap between the inner wall surface of the slot and the outer wall surface of the coil. The stator is described.

Japanese Unexamined Patent Publication No. 2013-208033 Japanese Unexamined Patent Publication No. 2015-19505

An in-vehicle rotary electric machine (for example, a rotary electric machine for electric power steering) is composed of two or more windings to make the system redundant. At this time, the windings of different systems are arranged at positions that do not overlap in the radial direction, but the position of the insulator (slot liner) provided in the slot varies, and the insulator is deformed or damaged when the coil is inserted. Insulation by insulators may not be sufficient, and it is required to secure clearance between systems.

A typical example of the invention disclosed in the present application is as follows. That is, a plurality of slots for accommodating the first system winding and the second system winding, which are composed of a plurality of segment coils and can be independently energized, and the first system winding and the second system winding are formed. The stator core is provided with an insulating member arranged on the coil end surface of the stator core, and the insulating members are formed so as to face each of the slots in the circumferential direction. It has a penetrating portion through which the system winding and the second system winding are inserted, and a bridge portion that separates the first system winding and the second system winding in the penetrating portion.

According to one aspect of the present invention, the degree of insulation can be improved between coils of different systems. Issues, configurations and effects other than those mentioned above will be clarified by the description of the following examples.

It is a perspective view which shows the schematic structure of the rotary electric machine assembly used in the electric power steering apparatus as an example to which this invention is applied. It is a figure which shows the schematic structure of the stator of this Example. It is a figure which shows the segment coil of this Example. It is a perspective view of the insulating member of this Example. It is a top view of the insulating member of this Example seen from the axial direction. It is a front view which looked at the insulating member of this Example from a radial direction. It is a partial cross-sectional view of the stator core which attached the insulating member of this Example. It is a partial cross-sectional view of the stator core which attached the insulating member of this Example. It is a top view which saw the stator core which attached the insulating member of this Example from the axial direction. It is a top view which saw the stator core which attached the insulating member of this Example from the axial direction.

Hereinafter, a rotary electric machine used in an electric power steering device as an example to which the present invention is applied will be described, but the present invention is also applicable to a rotary electric machine for other purposes as long as it is a rotary electric machine having a plurality of windings. it can.

FIG. 1 is a perspective view showing a schematic configuration of a rotary electric machine assembly 10 used in an electric power steering device as an example to which the present invention is applied.

In FIG. 1, the rotary electric machine assembly 10 is composed of a rotary electric machine 11 and an inverter control unit 12 that drives and controls the rotary electric machine 11.

The inverter control unit 12 has a built-in power semiconductor element that constitutes an inverter circuit, a drive circuit that drives the power semiconductor element, a control circuit that controls the drive circuit, and the like inside the housing. The inverter control unit 12 is fixed to the rotary electric machine 11, and the rotary electric machine assembly 10 in which both are integrated is attached to an in-vehicle device (for example, a power steering device (not shown)) with a through bolt or the like.

Although not shown in FIG. 1, a rotatable rotor and a stator that generates a rotational force in the rotor are provided inside the rotary electric machine 11. As the rotor, a surface magnet type rotor using a general permanent magnet or an embedded magnet type structure is used. The stator has a wave-wound structure in which a segment coil is inserted with an integral core, and the details thereof will be described later with reference to FIG.

FIG. 2 is a diagram showing a schematic configuration of a stator of this embodiment.

In FIG. 2, the segment coil 20 is inserted in the axial direction from the end surface 22A on the anti-weld side of the stator core 22, and the coil of the portion protruding to the end surface 22B on the welding side on the opposite side is bent in the circumferential direction for TIG welding. Connect so as to form a wave winding by means of.

At this time, the coil end portion 28 is formed between the end surface 22A on the anti-welding side and the tip of the hairpin portion 23 of the segment coil 20. The lead wire 21 of the coil is connected to the inverter control unit 12.

As shown in FIGS. 7 and 8, the stator is a stator by a segment coil 20 mounted in a plurality of slots 26 provided in a stator core 22 formed by laminating electromagnetic steel plates, separated by a slot liner 25. It is configured by winding a coil. The segment coil 20 is inserted into the stator core 22 and bends a portion protruding from the stator core 22 in the circumferential direction to form a bent portion at the coil end portion 28. An insulating member 50 is attached between the bent portion and the end surface 22A on the non-welded side of the stator core 22, and between the end surface 22B on the weld side of the stator core 22 and the bent portion of the segment coil 20.

The stator coil is electrically divided into a first system winding 100 and a second system winding 200, and the first system winding and the second system winding are separated in the radial direction and are first. The system winding is arranged on the inner peripheral side and the second system winding is arranged on the outer peripheral side. The slot liner 25 is arranged in a shape such as a C-shape, a U-shape, or a combination of two U-shapes so as to cover the periphery of the segment coil 20 in the stator core 22, and the stator core of the segment coil 20 is arranged. Prevents ground faults due to contact with 22.

FIG. 3 is a diagram showing a segment coil 20 of this embodiment.

In FIG. 3, it is preferable to use a flat wire whose two sides face each other in the cross section for the segment coil 20. The segment coil 20 has slot insertion portions 24 to be inserted into the slots 26 of the stator core 22 on both ends, and is formed in a substantially U-shape by hairpin portions 23 provided with one or more bending points connecting them. Will be done. The flat wire constituting the segment coil 20 forms a covering region covered with an insulator such as enamel in the hairpin portion 23 and the slot insertion portion 24, and the coating is peeled off at the tip thereof for welding. Copper, which is a material, forms an exposed area.

FIG. 4 is a perspective view of the insulating member 50, FIG. 5 is a plan view of the insulating member 50 viewed from the axial direction, and FIG. 6 is a front view of the insulating member 50 viewed from the radial direction.

As described above, the insulating member 50 of this embodiment is arranged on the non-welded end surface 22A of the stator core 22 and on the welded end surface 22B of the stator core 22. The insulating member 50 has a plurality of through holes 51 at positions corresponding to the plurality of slots 26 of the stator core 22, and the segment coil 20 is inserted into the through holes 51. The through hole 51 is composed of an inner peripheral side through hole 51A and an outer peripheral side through hole 51B, and a segment coil 20 constituting the first system winding 100 is inserted into the inner peripheral side through hole 51A, and the outer peripheral side through hole 51 is inserted. The segment coil 20 constituting the second system winding 200 is inserted through the 51B. A center bridge 52 is provided between the inner peripheral side through hole 51A and the outer peripheral side through hole 51B. Therefore, the first system winding 100 located in the second layer from the inner peripheral side and the second system winding 200 located in the third layer are the insulating members 50 arranged on both end faces of the stator core 22. The center bridge 52 spatially separates the slots 26.

A convex portion 53 is formed between the through holes 51 on the upper surface side of the insulating member 50, and a curved surface 54 is formed from the upper surface to the side surface of the convex portion 53.

A plurality of locking portions 55 are provided on the outer peripheral side of the lower surface of the insulating member 50 at predetermined intervals. The locking portion 55 engages with the engaging portion 27 provided on the stator core 22. By fitting the protrusions forming the locking portion 55 and the recesses of the engaging portion 27, the insulating member 50 can be positioned with respect to the stator core 22. The insulating member 50 may be provided with one locking portion 55, or may be provided with a plurality of locking portions 55 at predetermined intervals. Further, the insulating member 50 is a gap between the tips of the teeth on the inner circumference of the stator core 22, whether it is a groove provided on the outer circumference of the stator core 22 or a groove provided on the inner circumference of the stator core 22 as shown in the drawing. It may be.

In this way, the first system winding 100 and the second system winding 200 are spatially separated in the slot 26 by the thickness of the center bridge 52, and the first system winding and the second system winding are insulated from each other. Is secured.

7 and 8 are partial cross-sectional views of the stator core 22 to which the insulating member 50 is attached.

In the slot 26 of the stator core 22, two first system windings 100 are arranged on the inner peripheral side and two second system windings 200 are arranged on the outer peripheral side. An insulating member 50 is arranged on the upper end surface 22A of the stator core 22. Although not shown, the insulating member 50 is also arranged on the lower end surface 22B of the stator core 22.

A convex portion 53 is formed between the through holes 51 on the upper surface side of the insulating member 50, and a curved surface 54 is formed from the upper surface to the side surface of the convex portion 53. The first system winding 100 and the second system winding 200 are bent along the curved surface 54. That is, the curved surface 54 is formed according to the shape in which the first system winding 100 and the second system winding 200 (segment coil 20) are bent. The curved surface 54 serves as a fulcrum when bending the segment coil 20 and prevents contact between the stator core 22 and the segment coil 20.

9 and 10 are plan views of the stator core 22 to which the insulating member 50 is attached as viewed from the axial direction.

The insulating member 50 is provided with an inner peripheral side through hole 51A and an outer peripheral side through hole 51B partitioned by the center bridge 52.

As shown in FIG. 9, when viewed from the axial direction, the slot liner 25 is arranged along the inner wall of the slot 26, but at least the end portion 25A of the slot liner 25 is the inner peripheral side through hole 51A of the insulating member 50 and the through hole 51A. It is arranged outside the outer peripheral side through hole 51B. Therefore, when the segment coil 20 is inserted into the stator core 22 with the insulating member 50 mounted on the stator core 22, it becomes difficult for the segment coil 20 to come into contact with the slot liner 25, and deformation of the slot liner 25 is suppressed. it can. The entire slot liner 25 may be arranged outside the inner peripheral side through hole 51A and the outer peripheral side through hole 51B of the insulating member 50.

Further, as shown in FIG. 10, when viewed from the axial direction, the slot liner 25 is arranged along the inner wall of the slot 26, but the end portion 25A of the slot liner 25 is the inner peripheral side through hole 51A of the insulating member 50. And may be arranged at the position of the center bridge 52 inside the outer peripheral side through hole 51B. Therefore, when the segment coil 20 is inserted into the stator core 22 with the insulating member 50 mounted on the stator core 22, it becomes difficult for the segment coil 20 to come into contact with the end portion of the slot liner 25, and the slot liner 25 becomes difficult to contact. Deformation can be suppressed.

As described above, the stator of the rotary electric machine 100 according to the embodiment of the present invention includes the first system winding 100 and the second system winding 200 which are composed of a plurality of segment coils 20 and can be independently energized. , A stator core 22 in which a plurality of slots 26 for accommodating the first system winding 100 and the second system winding 200 are formed, and an insulating member 50 arranged on the end faces 22A and 22B of the stator core 22. The insulating member 50 is formed side by side in the circumferential direction at a position facing each slot 26, and has a through portion (through hole 51) through which the first system winding 100 and the second system winding 200 are inserted, and a through portion. In 51, since it has a bridge portion (center bridge 52) for partitioning the first system winding 100 and the second system winding 200, a mechanical space between coils of different systems is secured and the degree of insulation is improved. it can. Further, since it is not necessary to insulate the slot liner 25 in one slot and only the inner peripheral side of the slot 26 needs to be insulated, the shape of the slot liner 25 can be simplified.

Further, since the insulating member 50 has a convex portion 53 between the penetrating portions 51 adjacent in the radial direction, when the end portion of the segment coil 20 is bent in the circumferential direction, the segment coil 20 and the stator core 22 are brought into contact with each other. It can be prevented and insulation can be secured.

Further, the segment coil 20 is bent in the circumferential direction on the coil end (end faces 22A, 22B) side of the stator core 22, and the convex portion 53 forms a curved surface 54 along the bent shape of the segment coil 20. The curved surface 54 of the insulating member 50 serves as a fulcrum when bending the segment coil 20 in the circumferential direction, preventing contact between the segment coil 20 and the stator core 22, and improving workability.

Further, when viewed from the axial direction, the insertion space of the segment coil 20 formed by the slot liner 25 is formed larger than the insertion space of the segment coil 20 formed by the through portion 51, so that the end portion of the slot liner 25 is formed. It is arranged outside the penetrating portion 51, and when the segment coil 20 is inserted into the stator core 22, it becomes difficult for the segment coil 20 to come into contact with the end portion of the slot liner 25, and deformation of the slot liner 25 can be suppressed, resulting in workability. Can be improved.

Further, when viewed from the axial direction, the end portion of the slot liner 25 is arranged at a position overlapping the bridge portion 52, so that when the segment coil 20 is inserted into the stator core 22, the segment coil 20 is placed on the slot liner 25. It becomes difficult to come into contact with the end portion, deformation of the slot liner 25 can be suppressed, and workability can be improved.

Further, since the insulating member 50 has a locking portion 55 that engages with the stator core 22, the locking portion 55 engages with the engaging portion 27 provided on the stator core 22 to position the insulating member 50. It can be easily determined.

It should be noted that the present invention is not limited to the above-described examples, but includes various modifications and equivalent configurations within the scope of the attached claims. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described configurations. In addition, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment. In addition, the configuration of another embodiment may be added to the configuration of one embodiment. In addition, other configurations may be added / deleted / replaced with respect to a part of the configurations of each embodiment.

10 rotary electric machine assembly, 11 rotary electric machine, 12 inverter control unit, 20 segment coil, 21 lead wire, 22 stator core, 22A, 22B end face, 23 hairpin part, 24 slot insertion part, 25 slot liner, 25A end part, 26 slots, 27 engaging parts, 28 coil ends, 50 insulating members, 51A inner peripheral side through holes, 51B outer peripheral side through holes, 52 center bridges, 53 convex parts, 54 curved surfaces, 55 locking parts, 100 first system Winding, 200 2nd system winding

Claims (7)

The first system winding and the second system winding, which are composed of a plurality of segment coils and can be independently energized,
A stator core in which a plurality of slots for accommodating the first system winding and the second system winding are formed, and
An insulating member arranged on the coil end surface of the stator core is provided.
The insulating member is
A through portion formed side by side in the circumferential direction at a position facing each of the slots and through which the first system winding and the second system winding are inserted.
A stator of a rotary electric machine having a bridge portion for partitioning the first system winding and the second system winding in the penetrating portion. The stator of the rotary electric machine according to claim 1.
The insulating member is a stator of a rotary electric machine having a convex portion between the penetrating portions adjacent in the circumferential direction. The stator of the rotary electric machine according to claim 2.
The segment coil is bent in the circumferential direction on the coil end side of the stator core.
The convex portion is a stator of a rotary electric machine that forms a curved surface along the bent shape of the segment coil. The stator of the rotary electric machine according to claim 1.
A slot liner disposed in the slot and insulating between the segment coil and the stator core.
When viewed from the axial direction, the insertion space of the segment coil formed by the slot liner is larger than the insertion space of the segment coil formed by the penetration portion. The stator of the rotary electric machine according to claim 1.
A slot liner disposed in the slot and insulating between the segment coil and the stator core.
When viewed from the axial direction, the end portion of the slot liner is a stator of a rotary electric machine arranged at a position overlapping the bridge portion. The stator of the rotary electric machine according to claim 1.
The insulating member is a stator of a rotary electric machine having a locking portion that locks with the stator core. A rotary electric machine having the stator according to any one of claims 1 to 6.