WO2018025375A1

WO2018025375A1 - Stator for dynamo-electric machine

Info

Publication number: WO2018025375A1
Application number: PCT/JP2016/072976
Authority: WO
Inventors: 郷井口
Original assignee: 三菱電機株式会社
Priority date: 2016-08-04
Filing date: 2016-08-04
Publication date: 2018-02-08

Abstract

A stator for a dynamo-electric machine comprises: a stator body; a connection conductor provided to an axial-direction end part of the stator body; and a clip provided to the stator body, the clip holding the connection conductor. The clip has an inner clip member placed between the connection conductor and the stator body, and an outer clip member sandwiching the connection conductor against the inner clip member. An attachment surface for receiving an end part of the outer clip member is provided to the inner clip member. The inner clip member has a protrusion that protrudes from the attachment surface outward in the axial direction of the stator body. A gap is present between the protrusion and the outer clip member. An insulation varnish is present in the gap.

Description

Rotating electric machine stator

This invention relates to a stator of a rotating electric machine.

Conventionally, in order to supply electric power to a plurality of coils provided in a stator core, conductors connected to coil lead wires are arranged along the circumferential direction of the stator core, and an upper conductor fixing member and a lower conductor are arranged. 2. Description of the Related Art A stator for a rotating electrical machine is known in which a conductor is held in a stator core in a state where the conductor is sandwiched by a fixing member. In such a conventional rotating electric machine stator, the insulation performance of the coil is enhanced by impregnating the coil with a liquid insulating varnish to solidify the insulating varnish.

Therefore, in a conventional stator of a rotating electrical machine, the insulating varnish tends to accumulate on the upper surface of the upper conductor fixing member, and when the insulating varnish is solidified in a state where it accumulates on the upper surface of the upper conductor fixing member, it solidifies on the upper surface of the upper conductor fixing member The insulating varnish increases the axial dimension of the entire stator.

Conventionally, in order to reduce the amount of insulating varnish accumulated on the upper surface of the upper conductor fixing member, an inclined surface is provided on the upper surface of the upper conductor fixing member, or a plurality of through holes are provided in the upper conductor fixing member. There has been proposed a stator for a rotating electrical machine in which an insulating varnish is easily discharged from the upper surface of an upper conductor fixing member (see, for example, Patent Document 1).

JP 2008-211182 A

However, in the conventional stator of a rotating electrical machine shown in Patent Document 1, if the upper conductor fixing member is provided with an inclined surface on the upper surface, it is necessary to increase the thickness of the upper conductor fixing member. The dimension in the axial direction cannot be reduced.

Further, in the conventional rotating electrical machine stator shown in Patent Document 1, even if a plurality of through holes are provided in the upper conductor fixing member, the amount of insulating varnish that accumulates on the upper surface of the upper conductor fixing member is reduced. The effect of reducing the thickness of the insulating varnish accumulated on the upper surface of the upper conductor fixing member is low, and it is difficult to reduce the axial dimension of the entire stator.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a stator for a rotating electrical machine capable of reducing the dimension in the axial direction.

A stator of a rotating electrical machine according to the present invention includes a stator body, a connection conductor provided at an axial end of the stator body, and a clip that is provided on the stator body and holds the connection conductor. An inner clip member disposed between the connection conductor and the stator body; and an outer clip member sandwiching the connection conductor between the inner clip member. A mounting surface for receiving the end portion is provided, and the inner clip member has a protrusion that protrudes from the mounting surface outward in the axial direction of the stator body, and there is a gap between the protrusion and the outer clip member. In the gap, there is an insulating varnish.

According to the stator of the rotating electric machine according to the present invention, even when the liquid insulating varnish adheres to the outer clip member, the insulating varnish can be sucked into the gap by the capillary phenomenon and the surface tension of the insulating varnish. Thereby, a liquid insulating varnish can be effectively discharged | emitted from an outer clip member, and it can suppress that an insulating varnish remains in an outer clip member. Therefore, the dimension of the stator in the axial direction can be reduced.

It is a front view which shows the stator of the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows the coil unit of FIG. It is a disassembled perspective view which shows the coil unit of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1. It is an expanded sectional view which shows the protrusion of FIG. FIG. 6 is a partially enlarged cross-sectional view showing a state of the liquid insulating varnish accumulated on the first surface of the outer clip member of FIG. 5.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a front view showing a stator of a rotating electric machine according to Embodiment 1 of the present invention. In the figure, the rotating electrical machine has an annular stator 1 and a rotor (not shown) disposed inside the stator 1 via a gap. The stator 1 and the rotor are arranged coaxially. The rotor is rotatable about the axis with respect to the stator 1. The rotating electrical machine is used as, for example, a generator or an electric motor.

A stator 1 of a rotating electrical machine includes an annular stator body 2, a plurality of connection conductors 3 provided at axial ends of the stator body 2, and a plurality of connection conductors 3 provided on the stator body 2. And a plurality of clips 4 for holding the. The stator main body 2 has a plurality of coil units 5 that are connected to each other in a state of being arranged in an annular shape.

Each coil unit 5 has an iron core member 6, a coil 7 provided in the iron core member 6, and a resin insulator 8 interposed between the iron core member 6 and the coil 7. Each coil unit 5 is connected in an annular shape with the coil 7 disposed on the radially inner side of the stator body 2. The coil 7 is impregnated with an insulating varnish. The insulating varnish impregnated in the coil 7 is solidified.

The plurality of connection conductors 3 are arranged along the circumferential direction of the stator body 2 within the radial range of each coil 7 when the stator body 2 is viewed along the axial direction. The plurality of connection conductors 3 are annular conductors corresponding to the phases of the three-phase alternating current. Each connection conductor 3 has a connection portion 31 connected to the lead wire 71 of the coil 7. A lead wire 71 of the coil 7 is connected to each connection conductor 3 for each phase.

FIG. 2 is a perspective view showing the coil unit 5 of FIG. FIG. 3 is an exploded perspective view showing the coil unit 5 of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. The iron core member 6 includes a core back 61 and teeth 62 that protrude from the core back 61 to the inside in the radial direction of the stator body 2. In the stator body 2, a plurality of iron core members 6 are arranged in a ring shape in a state where the core backs 61 adjacent to each other are connected to each other. Thus, the annular stator core is composed of a plurality of core members 6. In this example, the iron core member 6 is composed of a plurality of thin steel plates stacked in the axial direction of the stator body 2.

The insulator 8 has a first insulator member 81 and a second insulator member 82. The first insulator member 81 and the second insulator member 82 are fitted to the teeth 62 with the teeth 62 sandwiched from both sides in the axial direction of the stator body 2.

Each of the first and

second insulator members

81, 82 includes a barrel portion that fits in the teeth 62, and a pair of flange portions 83 that are provided at both ends of the barrel portion and face each other in the radial direction of the stator body 2. Have.

The coil conducting wire constituting the coil 7 is wound around the teeth 62 through the trunk portion. As a result, the coil 7 is provided between the pair of flange portions 83 in a state in which the body portions of the first and

second insulator members

81 and 82 are covered.

The clip 4 is made of a heat resistant material. The clip 4 is attached to each of the pair of flange portions 83 in the first insulator member 81. Furthermore, the clip 4 is disposed in a state of being passed between the pair of flange portions 83 of the first insulator member 81. In the first insulator member 81, a pair of locking portions 84 that hold the clip 4 is provided at each axial end of each flange portion 83.

The clip 4 is a resin-made inner clip member 41 disposed between the plurality of connection conductors 3 and the stator body 2, and the resin made by sandwiching the plurality of connection conductors 3 between the inner clip member 41. And an outer clip member 42.

As shown in FIG. 3, the inner clip member 41 includes a U-shaped plate-like clip main body 411, a pair of clip attachment portions 412 provided at both ends of the clip main body 411, and a pair And a pair of protrusions 413 protruding from each of the clip attaching portions 412.

The clip body 411 is arranged with the inner surface facing the axial direction outside of the stator body 2. The plurality of connection conductors 3 are disposed inside the clip main body 411.

Each of the pair of clip mounting portions 412 is provided with a pair of inner clip claws 414 that are respectively engaged with the pair of locking portions 84. The inner clip member 41 is attached to each flange portion 83 of the first insulator member 81 in a state where each inner clip claw 414 is hooked on each locking portion 84.

Further, each of the pair of clip mounting portions 412 is provided with a mounting surface 415 that receives the end portion 42a of the outer clip member 42. The attachment surface 415 is a surface orthogonal to the axis of the stator body 2. The inner clip member 41 holds the outer clip member 42 in a state where the end portions 42a of the outer clip member 42 are received by the pair of attachment surfaces 415 in the axial direction.

The shape of the outer clip member 42 is a flat plate shape. A plurality of outer clip claws 421 are provided at each end 42 a of the outer clip member 42. Each of the pair of clip attachment portions 412 is provided with a plurality of attachment grooves 416 into which the outer clip claws 421 are inserted. The outer clip member 42 is attached to the inner clip member 41 in a state where the outer clip claws 421 inserted into the attachment grooves 416 are hooked on the pair of clip attachment portions 412.

The pair of protrusions 413 protrudes from the attachment surfaces 415 of the pair of clip attachment portions 412 to the outside in the axial direction of the stator body 2 while avoiding the outer clip member 42. Accordingly, the pair of protrusions 413 are disposed outside the region of the outer clip member 42 when viewed along the axial direction of the stator body 2. In this example, a pair of protrusions 413 are arranged on both sides of the outer clip member 42 in the radial direction of the stator body 2. That is, in this example, the outer clip member 42 is disposed between the pair of protrusions 413 in the radial direction of the stator body 2. Each protrusion 413 is disposed along the end 42 a of the outer clip member 42.

The flat outer clip member 42 is provided with a first surface 422 and a second surface 423 that face each other in the thickness direction of the outer clip member 42. The outer clip member 42 is disposed with the second surface 423 facing the inner clip member 41 and the first surface 422 facing away from the inner clip member 41. The mounting surface 415 of the clip mounting portion 412 receives the second surface 423 of the outer clip member 42.

In the direction in which the pair of protrusions 413 face each other, the distance between the facing surfaces of the pair of protrusions 413 is larger than the dimension of the outer clip member 42. Thereby, as shown in FIG. 4, gaps 43 exist between the pair of end portions 42 a of the outer clip member 42 and the pair of protrusions 413, respectively.

FIG. 5 is an enlarged sectional view showing the protrusion 413 of FIG. In the gap 43, the solidified insulating varnish 9 exists without a gap. In this example, the dimension of the gap 43, that is, the distance between the end 42a of the outer clip member 42 and the projection 413 is 0.5 mm to 1 mm.

The protrusion 413 protrudes outward in the axial direction from the first surface 422 of the outer clip member 42. The height of the protrusion 413 protruding from the first surface 422 is lower than the height of the insulating varnish 9 when attached to the first surface 422 in a liquid state. In this example, the height of the protruding portion of the protrusion 413 relative to the first surface 422 is lower than the height of the insulating varnish 9 when attached to the entire first surface 422.

In the insulating varnish 9 existing in the gap 43, an exposed surface 91 reaching the protrusion 413 from the outer clip member 42 is formed. The exposed surface 91 is inclined outward in the axial direction from the first surface 422 toward the protrusion 413. As a result, the exposed surface 91 is formed in a range outside the first surface 422 in the axial direction.

A curved surface 424 is formed continuously from the first surface 422 at the end 42 a of the outer clip member 42. The width of the gap 43 that exists between the curved surface 424 and the protrusion 413, that is, the distance between the curved surface 424 and the protrusion 413 continuously increases toward the outside in the axial direction. The curved surface 424 is covered with an insulating varnish 9.

A curved surface 417 is formed on the outer portion of the tip end portion of the projection 413 in the axial direction. Thereby, the width | variety of the axial direction edge part of the processus | protrusion 413 is narrowing continuously toward the axial direction outer side.

Next, a method for manufacturing the stator 1 of the rotating electrical machine will be described. When the stator 1 is manufactured, first, the stator body 2 is manufactured by connecting a plurality of coil units 5 formed by combining the iron core member 6, the coil 7, and the insulator 8 in a ring shape.

Thereafter, the plurality of inner clip members 41 are arranged at intervals in the circumferential direction of the stator body 2, and each inner clip member 41 is attached to the end portion in the axial direction of the stator body 2. At this time, each inner clip member 41 is attached to the flange portion 83 of the insulator 8 with the U-shaped inner surface facing the outer side in the axial direction of the stator body 2.

Thereafter, the plurality of connection conductors 3 are arranged in a ring shape along the circumferential direction of the stator body 2 while the plurality of connection conductors 3 are placed on the respective inner clip members 41. At this time, the lead wire 71 of each coil 7 is connected to the plurality of connecting conductors 3 for each phase by the connecting portion 31.

Thereafter, the outer clip member 42 is attached to the inner clip member 41 in a state where the plurality of connection conductors 3 are sandwiched together with the connection portion 31 between the inner clip member 41 and the inner clip member 41. The outer clip member 42 is disposed with the second surface 423 facing the inner clip member 41, the first surface 422 facing away from the inner clip member 41, and a pair of end portions 42 a of the inner clip member 41. Each outer clip claw 421 is hung on the pair of clip mounting portions 412 in a state of being individually applied to the pair of mounting surfaces 415, thereby being attached to the inner clip member 41. As a result, the clip 4 is completed, and the plurality of connecting conductors 3 are held by the clip 4 at the end in the axial direction of the stator body 2. At this time, a gap 43 is formed between the pair of end portions 42 a of the outer clip member 42 and the pair of protrusions 413.

After this, the stator body 2 to which the plurality of connection conductors 3 are attached with the plurality of clips 4 is immersed in a liquid insulating varnish stored in the container. At this time, the stator body 2 together with the connection conductors 3 and the clips 4 with the connection conductors 3 and the clips 4 facing upward, that is, with the first surface 422 of the outer clip members 42 facing upward. Immerse in a liquid insulating varnish. Thereby, each coil 7 is impregnated with a liquid insulating varnish.

Thereafter, the stator body 2 to which the plurality of connection conductors 3 are attached by the plurality of clips 4 is taken out from the liquid insulating varnish, and the excess insulating varnish is dropped from the stator body 2. At this time, since the first surface 422 of each outer clip member 42 is horizontal, the liquid insulating varnish tends to accumulate on the first surface 422.

FIG. 6 is a partially enlarged cross-sectional view showing a state of the liquid insulating varnish 9 accumulated on the first surface 422 of the outer clip member 42 of FIG. When the liquid insulating varnish 9 accumulates on the first surface 422 of the outer clip member 42, the liquid insulating varnish 9 is moved along the direction of the arrow in FIG. 6 by the surface tension and capillary action of the insulating varnish 9. To the gap 43. The insulating varnish 9 that has entered the gap 43 flows out from both sides of the clip mounting portion 412 in the width direction, and the phenomenon that the liquid insulating varnish 9 flows from the first surface 422 into the gap 43 continues. As a result, the liquid insulating varnish 9 accumulated on the first surface 422 is continuously discharged from the first surface 422, and the insulating varnish 9 is prevented from remaining on the first surface 422.

At this time, the insulating varnish 9 also tends to collect on the end surface in the axial direction of the protrusion 413, but the insulating varnish 9 flows down along the curved surface 417 because the curved surface 417 is formed at the tip in the axial direction of the protrusion 413. As a result, the insulating varnish 9 is less likely to collect at the tip of the protrusion 413 in the axial direction.

Thereafter, the insulating varnish 9 is solidified in a state where each coil 7 is impregnated with the insulating varnish 9. Thereby, the stator 1 of the rotating electrical machine is completed.

In such a stator 1 of a rotating electrical machine, a mounting surface 415 that receives the end portion 42a of the outer clip member 42 is provided on the inner clip member 41, and a projection 413 that protrudes from the mounting surface 415 outward in the axial direction of the stator body 2. Since the gap 43 exists between the outer clip member 42 and the outer clip member 42, the liquid insulating varnish 9 for reinforcing the insulation of the stator body 2 adheres to the first surface 422 of the outer clip member 42. Even in such a case, the insulating varnish 9 can be sucked into the gap 43 by the capillary phenomenon and the surface tension of the insulating varnish 9. Thereby, the liquid insulating varnish 9 can be effectively discharged from the outer clip member 42, and the insulating varnish 9 can be prevented from remaining on the outer clip member 42. Therefore, an increase in the dimension of the stator 1 due to the insulating varnish 9 remaining on the first surface 422 of the outer clip member 42 can be prevented, and the dimension of the stator 1 in the axial direction can be reduced. .

The protrusion 413 protrudes outward in the axial direction from the first surface 422 of the outer clip member 42, and the height of the portion where the protrusion 413 protrudes with respect to the first surface 422 is the first surface 422. Since it is lower than the height of the insulating varnish 9 when adhering in a liquid state to the first surface 422, it is accumulated on the first surface 422 while suppressing an increase in the dimension of the stator 1 in the axial direction due to the protrusion 413. The liquid insulating varnish 9 can be sucked into the gap 43 more reliably, and the liquid insulating varnish 9 can be more reliably discharged from the first surface 422.

The insulating varnish 9 solidified in the gap 43 is formed with an exposed surface 91 that reaches the protrusion 413 from the first surface 422 of the outer clip member 42, and the exposed surface 91 is the first surface 422. As a result, the phenomenon in which the insulating varnish 9 is sucked from the first surface 422 to the gap 43 when the liquid insulating varnish 9 accumulates on the first surface 422 is continuous. Therefore, the liquid insulating varnish 9 can be further prevented from remaining on the first surface 422. Thereby, the dimension about the axial direction of the stator 1 can be further reliably reduced.

In the above example, the protrusion 413 protrudes outward in the axial direction from the first surface 422 of the outer clip member 42. However, the present invention is not limited to this, and the position of the tip end in the axial direction of the protrusion 413 is about the axial direction. The position may be the same position as the first surface 422, or the position of the tip end portion in the axial direction of the protrusion 413 may be closer to the mounting surface 415 than the first surface 422 in the axial direction.

Claims

Stator body,
A connection conductor provided at an axial end of the stator main body, and a clip provided in the stator main body for holding the connection conductor;
The clip includes an inner clip member disposed between the connection conductor and the stator body, and an outer clip member sandwiching the connection conductor between the inner clip member,
The inner clip member is provided with a mounting surface that receives an end of the outer clip member,
The inner clip member has a protrusion protruding from the mounting surface to the outside in the axial direction of the stator body,
There is a gap between the protrusion and the outer clip member,
A stator of a rotating electric machine in which an insulating varnish exists in the gap.
The outer clip member is provided with a first surface,
The outer clip member is disposed with the first surface facing away from the inner clip member,
The protrusion protrudes outward in the axial direction from the first surface;
The height of the part from which the protrusion protrudes with respect to the first surface is lower than the height of the insulating varnish when attached to the first surface in a liquid state. Stator of rotating electrical machine.
The insulating varnish is formed with an exposed surface reaching the protrusion from the first surface,
The stator of a rotating electrical machine according to claim 2, wherein the exposed surface is present in a range outside in the axial line direction from the first surface.