WO2013005537A1

WO2013005537A1 - Split stator core

Info

Publication number: WO2013005537A1
Application number: PCT/JP2012/065078
Authority: WO
Inventors: 健太郎弓削; 村上　亮
Original assignee: 日産自動車株式会社
Priority date: 2011-07-01
Filing date: 2012-06-13
Publication date: 2013-01-10
Also published as: JP2014180067A

Abstract

A split stator core of the present invention comprises: a core segment where a plurality of magnetic steel sheets are laminated; a first insulation member which comes into close contact with a side surface of a teeth portion of the core segment; a second insulation member disposed at an edge of the core segment in a laminating direction of the magnetic steel sheet, the strength of the second insulation member being higher than the strength of the first insulation member; and a coil which is formed through winding around an outer circumference of the teeth portion of the core segment through the first insulation member and the second insulation member.

Description

Split stator core

The present invention relates to a split stator core used for an electric motor or a generator.

In order to improve the heat dissipation of the split stator core, there is a method of increasing the thermal conductivity of the components of the split stator core itself, a method of reducing the coil tension during coil winding, air generated by dimensional tolerance between the insulator and the core segment, etc. Methods for reducing the gap are known. As a method for reducing the air gap, JP2001-128402A discloses a method in which a thermally conductive resin is interposed between a core segment and an insulator.

However, the method of interposing a thermally conductive resin between the core segment and the insulator can reduce the air gap, but an increase in the thermal resistance of the thermally conductive resin is inevitable. In order to solve this problem, there is a method in which a resin powder coating as described in JP2010-132794A is applied to the core segment to maintain insulation between the coil and the core segment.

However, in the method in which the coil is directly wound around the core segment to which the resin powder coating is applied, there is a possibility that the load is concentrated on the edge of the core segment and the resin powder coating is peeled off when the coil is wound.

An object of the present invention is to provide a technique for improving the heat dissipation of a split stator core without damaging an insulator provided between a core segment and a coil.

The divided stator core in one embodiment is disposed at a core segment in which a plurality of electromagnetic steel plates are laminated, a first insulating member that is in close contact with a side surface of a tooth portion of the core segment, and an end of the core segment in the lamination direction of the electromagnetic steel plates. A second insulating member, and a coil formed by winding the outer periphery of the tooth portion of the core segment via the first insulating member and the second insulating member. The strength of the second insulating member is higher than that of the first insulating member.

Embodiments of the present invention and advantages of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of an electric motor including a split stator core according to the first embodiment. FIG. 2 is a view for explaining the configuration of the split stator core in the first embodiment. 3 is a cross-sectional view of the core segment taken along line III-III in FIG. FIG. 4 is an enlarged view of a connection portion between the first insulating member and the second insulating member. FIG. 5 is a diagram for explaining the configuration of the split stator core in the second embodiment. FIG. 6 is a diagram for explaining the configuration of the split stator core in the third embodiment. FIG. 7 is a diagram for explaining the configuration of the split stator core in the fourth embodiment.

Hereinafter, embodiments of the split stator core according to the present invention will be described with reference to the drawings. The divided stator core in each embodiment described below is one of the constituent elements of a stator of an electric motor or a generator. In addition, although the following description demonstrates the example which applied the division | segmentation stator core to the electric motor, it is also applicable to a generator.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view of an electric motor 1 having a split stator core in the first embodiment. The electric motor 1 includes a stator 3 and a rotor 4 disposed inside the stator 3. The electric motor 1 is a permanent magnet synchronous motor, for example, and is used by being mounted on an electric vehicle.

The stator 3 is a concentrated winding type stator, and is configured by combining a plurality of divided stator cores 2 in an annular shape. A coil 5 is formed on the outer periphery of the tooth portion of the split stator core 2 by winding a winding. Further, a ring support portion 6 for reinforcing the stator 3 is provided outside the stator 3. In FIG. 1, the coil 5 is drawn through so that the shape of the teeth portion of the stator 3 under the coil 5 can be seen.

FIG. 2 is a diagram for explaining the configuration of the split stator core 2 in the first embodiment. The split stator core 2 includes a core segment 7, a first insulating member 21 that is in close contact with the core segment 7, a second insulating member 22 that is positioned at the end of the core segment 7, the first insulating member 21, and the second insulating member 21. The coil is provided with a winding on the outer periphery of the tooth portion of the core segment 7 via the insulating member 22. In FIG. 2, the coil is omitted.

FIG. 2 shows a state before the second insulating member 22 is attached to the core segment 7. The second insulating member 22 is attached to the coil segment 6 from the direction of the arrow Y1.

FIG. 3 is a cross-sectional view of the core segment 7 taken along the line III-III in FIG. The core segment 7 is configured by laminating a plurality of electromagnetic steel plates punched in a T shape, and includes a tooth portion 8 serving as a T-shaped leg portion and a yoke portion 10 serving as a head portion. In FIG. 3, the second insulating member 22 is not shown, but the coil 5 is formed by winding a winding around the tooth portion 8 via the first insulating member 21 and the second insulating member 22. Yes.

Although omitted in FIG. 3, a concave portion and a convex portion (see FIG. 1) are formed on the side surface of the yoke portion 10 to facilitate the mutual connection between the divided stator cores.

The first insulating member 21 is in close contact with the side surface of the tooth portion 8 of the core segment 7 along the stacking direction of the plurality of electromagnetic steel sheets. As a material of the first insulating member 21, an insulating resin material that has excellent heat resistance and adheres well to the core segment 7 is used. Examples of the insulating resin material having good adhesion include a thermosetting resin (insulating paint) applied directly to the core segment 7, a thermoplastic resin that melts and adheres to the core segment 7, and adheres to the core segment 7 by vulcanization. There are a rubber-like elastic body to be molded, a heat-shrinkable tube that is in close contact with the core segment 7 by heat shrinkage, and the like. By using these materials, it is possible to easily improve the adhesion with the core segment 7 and efficiently transfer the heat of the coil 5 to the core segment 7. In addition, it is preferable that the raw material itself of the first insulating member 21 has a high thermal conductivity.

The second insulating member 22 is provided at both end portions of the core segment 7 in the rotation axis direction of the electric motor, in other words, at both end portions of the core segment 7 in the laminating direction of the electromagnetic steel sheets. The second insulating member 22 has a flange guide portion 22A for preventing the coil 5 from slipping in the radial direction. In FIG. 3, reference numeral 22 indicated by a dotted line is a flange guide portion 22 </ b> A of the second insulating member 22.

Of the second insulating members 22 provided at both ends of the core segment 7, at least one of the insulating members 22 is used for winding the winding around the core segment 7 and then winding the winding temporarily to fix the winding. It has a winding portion 22B. By providing the winding binding portion 22B, loosening of the winding is prevented and fixing to the stator is facilitated.

The second insulating member 22 is made of a material having a strength higher than that of at least the first insulating member 21. More specifically, for example, a resin having excellent heat resistance and strength that can withstand coil tension during winding, such as PPS (polyphenylene sulfide) and LCP (liquid crystal polymer), is used.

FIG. 4 is an enlarged view of a connection portion between the first insulating member 21 and the second insulating member 22. The first insulating member 21 and the second insulating member 22 are separately attached to the core segment 7.

The width H1 of the second insulating member 22 attached to the end of the core segment 7 is equal to the width H2 between the first insulating members 21 in close contact with both side surfaces of the tooth portion of the core segment 7. Here, the width H1 of the second insulating member 22 is the width in the rotation direction of the electric motor, and the width H2 between the first insulating members 21 is the end of the first insulating member 21 with the tooth portion interposed therebetween. It means the width from to the end. That is, when the first insulating member 21 and the second insulating member 22 are attached to the core segment 7, there is no step at the portion where the first insulating member 21 and the second insulating member 22 are in contact. Further, the corner portion 22C of the second insulating member 22 around which the winding is wound, that is, the corner portion 22C where the second insulating member 22 is in contact with the first insulating member 21 has a rounded R shape.

For example, when there is a step at a portion where the first insulating member 21 and the second insulating member 22 are in contact with each other, between the winding and the first insulating member 21 or the second insulating member 22 at the step portion. An air gap is generated in the substrate and the thermal conductivity is lowered. Further, when the shape of the corner portion 22C of the second insulating member 22 around which the winding is wound is not an R shape, the load may concentrate on the corner portion 22C, and the coil 5 may be damaged. However, in the split stator core in the first embodiment, there is no step at the portion where the first insulating member 21 and the second insulating member 22 are in contact, and the corners of the second insulating member 22 around which the winding is wound. Since the shape of the portion 22C is an R shape, the winding can be easily wound around the core segment 7. Further, there is no problem such as a decrease in thermal conductivity as described above or damage to the coil.

As described above, according to the split stator core in the first embodiment, the first insulating member 21 is brought into close contact with the side surface of the tooth portion of the core segment 7, so that the air gap between the core segment 7 and the coil 5 is reduced. The heat of the coil 5 can be efficiently transmitted to the core segment 7 to improve the heat dissipation of the stator core. In addition, since the second insulating member 22 having higher strength than the first insulating member 21 is provided at the end of the core segment 7 in the laminating direction of the electromagnetic steel sheets, the load at the corner where the winding is wound is applied to the second portion. The insulating member 22 is received, and it is possible to prevent the first insulating member 21 from being peeled off by the winding of the coil.

Further, the width H1 of the second insulating member 22 disposed at the end of the core segment 7 is equal to the width H2 between the first insulating members 21 in close contact with both side surfaces of the tooth portion of the core segment 7. There is no step between the first insulating member 21 and the second insulating member 22. As a result, it is possible to prevent the winding from being caught due to the misalignment of the joint portion and to prevent an air gap from occurring at the stepped portion.

Further, since the corner of the second insulating member 22 around which the winding is wound has an R shape, the winding can be easily wound while preventing the winding from being damaged.

Since the second insulating member 22 has the flange 22A for preventing the coil from slipping, the coil can be prevented from slipping. Moreover, since the 2nd insulation member 22 has the coil | winding binding part 22B for fixing a coil | winding, it can prevent loosening of a coil | winding and can be easily fixed to a stator.

<Second Embodiment>
FIG. 5 is a diagram for explaining the configuration of the split stator core 50 according to the second embodiment. The split stator core 50 includes a core segment 7, a first insulating member 51 that is in close contact with the core segment 7, a second insulating member 52 that is positioned at the end of the core segment 7, the first insulating member 51, and the second insulating member 51. The coil is provided with a winding on the outer periphery of the tooth portion of the core segment 7 through the insulating member 52. In FIG. 5, the coil is omitted.

FIG. 5 shows a state before the second insulating member 52 is attached to the core segment 7. The second insulating member 52 is attached to the core segment 7 from the direction of the arrow Y2.

The first insulating member 51 is in close contact with the side surface of the tooth portion 8 of the core segment 7 along the stacking direction of the plurality of electromagnetic steel sheets. Although the length of the 1st insulating member 21 in 1st Embodiment was the same as the length of the side surface of the teeth part 8, the length of the 1st insulating member 51 in 2nd Embodiment is the teeth part. 8 is shorter than the length of the side surface. This is for assembling the sandwiching portion 52D of the second insulating member 52 to a part of the side surface of the tooth portion 8 as described later. That is, the length of the sandwiching portion 52D of the second insulating member 52 assembled to the side surface of the tooth portion 8 is shorter than the length of the side surface of the tooth portion 8.

The material of the first insulating member 51 is an insulating resin material that has excellent heat resistance and adheres well to the core segment 7 as in the first insulating member 21 in the first embodiment.

The second insulating member 52 is provided at both end portions of the core segment 7 in the rotation axis direction of the electric motor, in other words, at both end portions of the core segment 7 in the laminating direction of the electromagnetic steel sheets. The second insulating member 52 has a flange guide portion 52A for preventing the coil 5 from slipping in the radial direction.

Of the second insulating members 52 provided at both ends of the core segment 7, at least one of the insulating members 52 is used for winding the winding around the core segment 7 and then winding the winding temporarily to fix the winding. It has a winding portion 52B.

The second insulating member 52 also has a sandwiching portion 52D for fixing the core segment. The sandwiching portion 52D has a shape that sandwiches the side surface of the tooth portion 8 of the core segment 7 from both sides. That is, when attaching the 2nd insulation member 52 to a core segment, it attaches by pinching the side surface of the teeth part 8 of the core segment 7 from both sides by the clamping part 52D.

Further, the corner 52C of the second insulating member 52 around which the winding is wound has a rounded R shape like the corner 22C of the first insulating member 22.

The second insulating member 52 is made of a material having strength higher than that of the first insulating member 51 at least. More specifically, for example, a resin having excellent heat resistance and strength that can withstand coil tension during winding, such as PPS (polyphenylene sulfide) and LCP (liquid crystal polymer), is used.

In the split stator core according to the second embodiment, the contact area between the core segment 7 and the first insulating member 51 is narrowed by the amount of the flange portion 52D as compared with the split stator core according to the first embodiment. However, in the first embodiment, an adhesive is required to attach the second insulating member 22 to the core segment 7, but in this embodiment, no adhesive is required, and the second insulating member 52 is not provided. It can be easily assembled to the core segment 7.

As described above, according to the split stator core in the second embodiment, the same effect as that of the split stator core in the first embodiment is obtained, and the second insulating member 52 sandwiches the side surface of the tooth portion of the core segment 7 from both sides. Therefore, the second insulating member 52 can be easily assembled to the core segment 7.

<Third Embodiment>
FIG. 6 is a diagram for explaining the configuration of the split stator core 60 according to the third embodiment. In the divided stator core 2 in the first embodiment, the first insulating member 21 is in close contact with the side surface of the tooth portion of the core segment 7. In the split stator core 60 according to the third embodiment, the first insulating member 61 is in close contact with not only the side surface of the tooth portion of the core segment 7 but also the end portion of the core segment 7 in the lamination direction of the electromagnetic steel sheets. That is, the 1st insulating member 61 is continuously arrange | positioned in the perimeter of the teeth part of the core segment 7 in which a coil is wound.

The material of the first insulating member 61 is an insulating resin material that has excellent heat resistance and adheres well to the core segment 7 as in the first insulating member 21 in the first embodiment.

The second insulating member 22 is disposed at both ends of the core segment 7 with the first insulating member 21 interposed therebetween.

As described above, according to the split stator core in the third embodiment, the same effect as that of the split stator core in the first embodiment can be obtained, and the first insulating member 61 can be replaced with the teeth portion of the core segment 7 around which the coil is wound. Since the first insulating member 61 is easily adhered and fixed to the entire periphery of the first insulating member 61.

<Fourth Embodiment>
In the divided stator core 60 according to the third embodiment, the first insulating member 61 is continuously in close contact with the entire circumference of the tooth portion of the core segment 7 around which the coil is wound, and the second insulating member 22 is formed from above. Arranged. In the split stator core 70 according to the fourth embodiment, the first insulating member 71 is continuously provided on the entire circumference of the tooth portion of the core segment 7 with the second insulating member 22 disposed at both ends of the core segment 7. To place. As the material of the first insulating member 71, an insulating resin material that has excellent heat resistance and adheres well to the core segment 7 is used, like the first insulating member 21 in the first embodiment.

FIG. 7 is a diagram for explaining the configuration of the split stator core 70 according to the fourth embodiment. As shown in FIG. 7, with the second insulating member 22 disposed at both ends of the core segment 7, the second insulating member 22 is continuously formed on the entire circumference of the tooth portion of the core segment 7 from above the second insulating member 22. One insulating member 71 is brought into close contact.

As described above, according to the split stator core 70 in the fourth embodiment, the same effect as that of the split stator core in the third embodiment is achieved, and the first insulating member 71 is disposed at the end of the core segment 7. Since the second insulating member 22 is disposed from above, the second insulating member 22 does not need to be bonded and fixed. In addition, since the coil is formed by winding the winding around the entire circumference from the top of the first insulating member 71, the thermal resistance is reduced as compared with the configuration of the split stator core 2 in the first embodiment. That is, the air gap between the first insulating member 71 and the coil is reduced over the entire circumference.

The present invention is not limited to the first to fourth embodiments described above. For example, in the first embodiment described above, the second insulating members 22 are provided at both ends of the core segment 7 in the laminating direction of the electromagnetic steel sheets, but the second insulating member 22 is provided only at one end. You may make it provide. Even in this case, compared with a configuration in which the second insulating member 22 is not provided at all, it is possible to prevent the load from being concentrated on the core segment edge portion during winding on the side where the second insulating member 22 is provided. . Similarly, also in 2nd Embodiment, you may make it provide the insulating member 52 only in one edge part instead of the both ends of the core segment 7 in the lamination direction of an electromagnetic steel plate.

As the material of the first insulating

members

21 and 51, a thermosetting resin (insulating paint) applied directly to the core segment 7, a thermoplastic resin that melts and adheres to the core segment 7, and adheres to the core segment 7 by vulcanization. Examples include rubber-like elastic bodies to be molded, heat-shrinkable tubes that are in close contact with the core segment 7 by heat shrinkage, and the like. However, the material of the first insulating

members

21 and 51 is not limited to these.

This application claims priority based on Japanese Patent Application No. 2011-147231 filed with the Japan Patent Office on July 1, 2011, the entire contents of which are incorporated herein by reference.

Claims

A core segment in which a plurality of electromagnetic steel sheets are laminated;
A first insulating member in close contact with the side surface of the tooth portion of the core segment;
A strength higher than that of the first insulating member, a second insulating member disposed at an end of the core segment in the laminating direction of the electromagnetic steel sheet;
A coil formed by winding the outer periphery of the tooth portion of the core segment via the first insulating member and the second insulating member;
A split stator core comprising:
The width of the second insulating member disposed at the end of the core segment is equal to the width between the first insulating members in close contact with both side surfaces of the tooth portion of the core segment.
The split stator core according to claim 1.
The corner of the second insulating member around which the winding is wound has an R shape,
The split stator core according to claim 1 or 2.
The second insulating member has a flange for preventing the coil from slipping.
The split stator core according to any one of claims 1 to 3.
The second insulating member has a winding binding portion for fixing the winding,
The split stator core according to any one of claims 1 to 4.
The first insulating member is continuously disposed on the entire circumference of the teeth portion of the core segment in which the coil is formed.
The split stator core according to any one of claims 1 to 5.
The first insulating member is disposed from above the second insulating member disposed at an end of the core segment.
The divided stator core according to claim 6.
The second insulating member has a sandwiching portion for sandwiching a side surface of the teeth portion of the core segment from both sides.
The split stator core according to any one of claims 1 to 5.
The first insulating member is a thermosetting resin applied to the side surface of the tooth portion of the core segment.
The split stator core according to any one of claims 1 to 8.
The first insulating member is a thermoplastic resin that is melt-adhered to the side surface of the teeth portion of the core segment.
The split stator core according to any one of claims 1 to 8.
The first insulating member is a rubber-like elastic body that is tightly formed on a side surface of the teeth portion of the core segment by vulcanization.
The split stator core according to any one of claims 1 to 8.
The first insulating member is a heat shrinkable tube that is in close contact with the side surface of the tooth portion of the core segment by heat shrinkage.
The split stator core according to any one of claims 1 to 8.
An electric motor configured by annularly combining the split stator cores according to any one of claims 1 to 12.
A generator configured by combining the split stator cores according to any one of claims 1 to 12 in an annular shape.