KR101761159B1

KR101761159B1 - Electric motor stator

Info

Publication number: KR101761159B1
Application number: KR1020150089829A
Authority: KR
Inventors: 김지웅; 조윤호; 이기옥
Original assignee: 주식회사 맥시스
Priority date: 2015-06-24
Filing date: 2015-06-24
Publication date: 2017-07-25
Also published as: KR20170000644A

Abstract

The present invention relates to an electric motor stator and a method of manufacturing the same, and more particularly, to an electric motor stator and a method for manufacturing the stator core, which comprises a stator core having a plurality of slots formed in an inner periphery thereof, a plurality of segment conductors inserted in the slots, The electrical connection of the segment conductor is inserted into the connecting member and the welded portion is minimized through the electrical resistance welding, so that the electric power applied to the segment conductor is minimized, A motor stator and a manufacturing method thereof are provided.

Description

[0001] ELECTRIC MOTOR STATOR [0002]

The present invention relates to an electric motor stator, and more particularly, to an electric motor stator having improved insulation performance of a segment conductor included in a stator.

In general, a generator and an electric motor are equipped with a rotor and a rotor which are relatively movable with respect to the stator.

The stator of a conventional motor includes a stator core having a plurality of slots formed therein and a winding wound on the slot many times. However, such winding-type stator could not be wound around the slot so that the winding would fill the slot, because the number of turns was limited so as to properly limit the volume of the winding protruding out of the slot.

In consideration of this point, a so-called HAIR PIN called SEGMENT CONDUCTOR having a U-shape is inserted into a slot formed in the stator core, and the end of the segment conductor protruding from the stator core is welded in a predetermined manner Was invented.

On the other hand, the electric motor provided in the vehicle is exposed to foreign substances such as electrolytic liquid and dust contained in an external influent, for example, car wash water, etc., Because of this, it is common that an insulating layer is formed in the segment conductor to protect the segment conductor from external influences, as the segment conductor is likely to corrode.

However, in order to electrically connect the segment conductors, arc welding has been applied. Heat generated during arc welding causes thermal load on the segment conductors, which may cause the insulation of the segment conductors to break, and the insulating layer forming material melts on the welds A high-quality joint could not be obtained. Also, it is troublesome to connect the ground necessary for arc welding to the segmented conductor to be welded.

Korean Patent Publication No. 10-2013-0004822 (Apr.

It is an object of the present invention, which has been made in view of the above circumstances, to minimize the thermal load applied to the insulating layer formed on the segment conductor when a plurality of segment conductors mounted on the stator core are electrically connected, And to provide an electric motor stator that facilitates the joining operation between the segment conductors.

In order to achieve the above object, an electric motor stator according to an embodiment of the present invention includes a stator core having a plurality of slots formed in an inner periphery thereof, a plurality of segments inserted in the slots and bent to extend from one of the slots to the other, And a conductive connecting member mounted at either end of the plurality of segment conductors and electrically connecting the plurality of segment conductors.

The connecting member may also be mounted to connect the ends of two adjacent segment conductors of the segment conductors inserted in any one of the plurality of slots.

Further, the connecting member is formed so as to surround the segment conductor, and the end of the two segment conductors can be inserted into the connecting member.

In addition, both opposing sides of the connecting member can be electrically resistively welded.

Further, an insulating layer may be formed on the outer surface of the segment conductor.

In addition, the insulating layer can be removed at the end of the segment conductor on which the connecting member is mounted.

Further, an insulating layer may be formed on the outer surface of the connecting member.

According to another aspect of the present invention, there is provided a method of manufacturing an electric motor stator, comprising: mounting a plurality of segment conductors in a plurality of slots formed in a stator core; Wherein the conductive connecting member is mounted, and both sides of the connecting member are electrically resistively welded.

Further, the connecting member may be pressed so that the connecting member is brought into close contact with the end portion before the both surfaces of the connecting member are electrically resistively welded.

Further, after the step of electrical resistance welding both surfaces of the connecting member, an insulating layer may be formed on the connecting member shell.

According to the electric motor stator of the present invention as described above, since the electrical connecting portions of the segment conductors are inserted into the connecting members and the connecting members are electrically resistively welded, the segment conductors are electrically connected to minimize the heat applied to the insulating layer formed on the segment conductors .

As a result, insulation breakdown of the segment conductor is prevented, and a high quality welding result can be obtained.

In addition, since the ground that was needed in the arc welding is excluded, there is an effect that the welding work for the electrical connection of the segment conductor is facilitated.

1 is a perspective view of an electric motor stator of an embodiment of the present invention,
Fig. 2 is an exploded perspective view of the electric motor stator of Fig. 1,
Figure 3 is a partial enlarged view of the electric motor stator of Figure 1,
Figure 4 is a partial enlarged view of the electric motor stator of Figure 1;
5 is a flowchart of a method of manufacturing an electric motor stator according to an embodiment of the present invention.

Hereinafter, preferred embodiments of an electric motor stator of the present invention and a manufacturing method thereof will be described in detail with reference to the accompanying drawings.

1 to 4, an electric motor stator of an embodiment of the present invention includes a stator core 100, a segment conductor 200, and a conductive connecting member 300.

The stator core 100 is formed in a donut shape so that a rotor (not shown) can be rotatably received therein. The stator core 100 includes a plurality of slots 110 cut to insert a segment conductor 200 from the inner periphery toward the outer periphery and teeth 120 formed between the slots 110 and the slots 110.

One side of the tooth 120 facing the center axis of the stator core 100 is formed with a separation protrusion 121 which is horizontal with the segment conductor 200 so that the segment conductor 200 inserted in the slot 110 is not released.

The segment conductor 200 is manufactured in the shape of a hairpin. The segment conductor 200 includes two legs 210 that are spaced apart from one another and a connecting portion 220 that connects the legs 210.

Each leg 210 is inserted into a different slot 110 such that the end 230 of the leg 210 and the connecting portion 220 are protruded out of the slot 110. The leg 210 protrudes from one side of the stator core 100 with respect to the center, and the connecting portion 220 protrudes from the other side.

In the slot 110, an even number of legs 210 are inserted. An insulating layer (not shown) is formed on the outer surface of the segment conductor 200. At the end 230 of the segment conductor 200 on which the connecting member 300 is mounted, the insulating layer is preferably removed for electrical connection.

The connecting member 300 may be more accurately positioned at one end 110 of one of the plurality of slots 110 than at one end 110 of the two adjacent segment conductors 200, Of the plurality of legs 210 inserted into the first legs 210. [

The connecting member 300 is formed to surround the segment conductor 200 and the end 230 of the two segment conductors 200 is inserted into the connecting member 300. In this case, The connecting member 300 is preferably made of a copper BUS bar so that it is easy to deform and the joining to the segment conductor 200 is easy. An insulating layer is formed on the outer surface of both sides of the connecting member 300.

Further, both opposite sides of the connecting member 300 are subjected to electric resistance welding. Electric resistance welding is a kind of hot pressing (hot pressing), which is to press a welding object and to electrically connect the coating wire to the dissimilar metal with a resistive heat generated in the welding.

That is, both electrode tips of an electric resistance welder (not shown), for example, the movable electrode tip and the fixed electrode tip of the spot welder, are brought into contact with the both sides of the connecting member 300, respectively. It is preferable that the electric resistance welder manufactured in consideration of the size of the stator core 100, the segment conductor 200, and the gap between the end portions 230 of the segment conductor 200 is applied.

The end portions 230 of the segment conductor 200 inserted into the connecting member 300 and the connecting member 300 are electrically connected to each other by electrically resistive welding both opposite sides of the connecting member 300 into which the segment conductor 200 is inserted .

At this time, since both the electrode tips of the electric resistance welder, which is a direct heat source, are in contact with only the connecting member 300, heat is applied to only the local parts of the segment conductor 200 contacting the connecting member 300.

As a result, heat is not applied to the legs 210 and the connecting portions 220 excluding the end portions 230 of the segmented conductors 200, so that the destruction of the insulating layer applied outside the end portions 230 of the segmented conductors 200 is prevented do.

In contrast, during conventional arc welding, heat generated during arc welding was transferred from the welded portion of the segment conductor 200 to the leg 210 mounted on the slot 110. Destruction of the insulating layer formed outside the welded portion of the segment conductor 200 was inevitable.

An electric motor stator according to an embodiment of the present invention constructed as above is manufactured according to the procedure diagram shown in Fig.

5, a method of manufacturing an electric motor stator according to an embodiment of the present invention includes a step S100 of mounting a plurality of segment conductors 200 in a plurality of slots 110 formed in a stator core 100, A step S200 of inserting an end 230 of either of the plurality of segment conductors 200 into the conductive connecting member 300 formed to surround the segment conductor 200, (Step S400).

In step SlOO where the segment conductor 200 is mounted on the stator core 100, the legs 210 included in the segment conductor 200 are mounted in the respective slots 110 to form a predetermined pattern. At this time, the plurality of segment conductors 200 are not connected.

The bus bar or the connecting member 300 that is bent to enclose the segment conductor 200 in the step S200 of inserting the end 230 of the two segment conductors 200 into the conductive connecting member 300, The two legs 210 positioned inwardly from the outermost two legs 210 of the plurality of legs 210 arranged in the order of the two legs 210 are installed.

Thereafter, both sides of the connecting member 300 are subjected to electric resistance welding and the connecting member 300 is joined to the end portion 230 through the step S400 in which both sides of the connecting member 300 are subjected to the electric resistance welding.

More precisely, the ends 230 of the segment conductor 200 inserted into the connecting member 300 at the same time as the both sides of the connecting member 300 are subjected to the electric resistance welding are joined to the connecting member 300. At this time, the electric resistance welding is repeated twice so that the connecting member 300 is joined to the two ends 230 inserted in the connecting member 300, respectively.

The connecting member 300 is connected to the end 230 of the two legs 210 after the connecting member 300 is mounted to the end 230 of the two legs 210 arranged in the slot 110. In this case, (S300) is performed in which the connection member 300 is pressed to be in close contact with the first connection member 300.

The connecting member 300 is brought into close contact with the pressed end 230 to prevent the connecting member 300 from being separated from the segment conductor 200 before the electrical resistance welding. The pressing device (not shown) for pressing the connecting member 300 is preferably manufactured in consideration of the size of the stator core 100, the segment conductors 200, and the spacing between the end portions 230 of the segment conductors 200 .

In an embodiment of the present invention, a step S500 of forming an insulating layer (not shown) on the outer surface of the connecting member 300 after the step S400 of performing electrical resistance welding on both sides of the connecting member 300 .

The breakage of the insulating layer formed on the connecting member 300 is restored to prevent corrosion of the connecting member 300 during the electrical resistance welding.

The connection member 300 is mounted and electrically resistively welded to the end 230 of the segment conductor 200 inserted into the slot 110 so that a plurality of the segment conductors 200 are electrically connected and are caused by conventional arc welding Thermal deformation or thermal breakdown of the insulating layer (not shown) formed on the segment conductor 200 is minimized.

Particularly, compared with the case where the segment conductor 200 is welded by the conventional arc welding, the welded portion is minimized, so that it is easy to obtain a high quality welded product. In addition, since the ground for welding is not required, work for electrically connecting the segment conductors 200 is easily performed.

As described above, the preferred embodiments of the electric motor stator of the present invention and the method of manufacturing the same are described with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments, May be changed within the range described in the range.

100: stator core 110: slot
120: Teeth 121:
200: segment conductor 210: leg
220: connection part 230: end part
300: connecting member

Claims

A stator core including a plurality of slots formed in the inner circumference and a tooth formed between each slot and the slot, the one side of the teeth having a separation preventing tab for preventing separation of the segment conductor inserted in the slot;
A plurality of segment conductors inserted into the slots to be mounted to the stator core; And
And a plurality of conductive connecting members mounted on ends of the plurality of segment conductors to electrically connect the two ends of the plurality of segment conductors,
The connecting member includes:
The end portions of the inserted two segment conductors are electrically resistively welded to the connecting member by applying electricity by contact with the electrode tips while opposing both surfaces being pressed,
So that the insulation layer formed on the segment conductor is not broken.

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The method according to claim 1,
And an insulating layer is formed on an outer surface of the connecting member.

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