CN-224203855-U - Enameled wire and motor stator

Abstract

The utility model belongs to the technical field of motors, and particularly relates to an enameled wire and a motor stator, wherein the enameled wire comprises a wire core, an insulating layer coating the outer part of the wire core and a foaming coating capable of forming a foaming layer through foaming expansion, and the foaming coating covers the outer surface of the insulating layer.

Inventors

• GUO ZHONGQI
• JIANG DAQIAN
• SUN WEIDONG
• HAO XIUFENG

Assignees

• 联合汽车电子有限公司

Dates

Publication Date

20260505

Application Date

20250516

Claims (10)

1. 1. An enameled wire, characterized by comprising: A wire core; An insulating layer coating the outside of the wire core; And a foaming coating capable of forming a foaming layer by foaming and expanding, the foaming coating covering an outer surface of the insulating layer.
2. 2. The wire of claim 1, wherein the foam coating comprises at least two layers, wherein the expansion rate of the foam coating is greater for an outer layer away from the wire core than for an inner layer.
3. 3. The wire of claim 1 wherein thermally responsive microcapsules are disposed within the foamed coating.
4. 4. The enameled wire according to claim 1, characterized in that heat conducting particles are arranged in the foamed coating and/or insulating layer.
5. 5. The wire according to claim 1, wherein the surface portion of the foaming coating layer is embedded with ceramic microbeads having an average particle diameter of 10 μm to 50 μm.
6. 6. The enamel wire according to claim 1, wherein the foaming coating layer is made of polyurethane, epoxy resin, silica gel or rubber foaming material.
7. 7. The wire according to claim 1, wherein the foaming coating layer is a closed loop coating structure, completely covering the outer circumferential surface of the insulation layer.
8. 8. The wire according to claim 1, wherein the wire has a cross-sectional shape of a flat wire, a round wire, or a wire with a special shape, and the wire with a special shape has an oval or polygonal cross-section.
9. 9. A motor stator, comprising: A winding comprising the enamel wire of any one of claims 1-8; The stator body comprises a stator groove; And the foaming coating fills a gap between the enameled wire and the stator groove after foaming and expanding.
10. 10. The motor stator according to claim 9, wherein the inner wall of the stator slot is provided with a limit slot, and the foam coating fills a gap between the enamel wire and the stator slot after being heated to expand to form a foam layer, and forms mechanical interlocking by complementarily matching the surface protrusion of the foam layer with the shape of the limit slot.

Description

Enameled wire and motor stator Technical Field The utility model belongs to the technical field of motors, and particularly relates to an enameled wire and a motor stator. Background The fixing technology of the motor winding is one of the key factors influencing the motor performance and service life. Enameled wires are an integral part of the motor windings, but have the problem of play during the assembly process. In the traditional process, a slot wedge fixing method is widely adopted because of the convenience of operation, the slot wedge made of phenolic aldehyde laminated plates or epoxy resin is embedded into an iron core notch, and the fastening of the enameled wire is realized by using mechanical pressure. However, in practical application, the problems of complicated manual slot wedge inserting process and low assembly efficiency exist in the scheme; Aiming at the problem of gap filling between the enameled wire and the iron core slot, the impregnating varnish fixing method permeates the insulating varnish into the winding gap through a Vacuum Pressure Impregnation (VPI) process to form a solidified bonding structure. Although the process can improve the integrity of the winding, the implementation process has problems that, for example, a high-precision vacuum system and a pressure control device are required to be equipped for vacuum pressure impregnation equipment, so that the equipment investment and operation and maintenance costs are high, and secondly, the curing period of impregnating varnish is long and the production efficiency is limited, so that the scheme provides an enameled wire to solve the problems. Disclosure of utility model In view of the above drawbacks of the prior art, an object of the present utility model is to provide an enameled wire and a motor stator, wherein when the enameled wire is applied to the motor stator, a foaming coating layer fills gaps among slots of the stator through foaming expansion characteristics, so that the installation stability of the enameled wire is effectively enhanced, the play phenomenon is inhibited, and the enameled wire has the advantages of low cost and easy installation. To achieve the above and other related objects, the present utility model provides an enamel wire comprising: A wire core; An insulating layer coating the outside of the wire core; And a foaming coating capable of forming a foaming layer by foaming and expanding, the foaming coating covering the outer surface of the insulating layer. In an embodiment of the present utility model, the foaming coating layer includes at least two layers, wherein the expansion rate of the foaming coating layer far from the outer layer of the wire core is larger than that of the foaming coating layer of the inner layer. In one embodiment of the utility model, thermally responsive microcapsules are disposed within the foamed coating, the thermally responsive microcapsules comprising a filler material made of paraffin or a shape memory polymer. In an embodiment of the present utility model, the foamed coating and/or the insulating layer are provided with heat conductive particles, and the heat conductive particles are made of boron nitride nanosheets or aluminum oxide particles. In one embodiment of the present utility model, ceramic microbeads having an average particle diameter of 10 μm to 50 μm are partially embedded in the surface of the foaming coating layer. In one embodiment of the present utility model, the foaming coating is made of polyurethane, epoxy, silica gel or rubber foaming material. In an embodiment of the present utility model, the foaming coating layer is a closed loop coating structure, and completely covers the outer peripheral surface of the insulating layer. In an embodiment of the present utility model, the section shape of the enameled wire is a flat wire, a round wire or a special-shaped wire, and the special-shaped wire is an oval or polygonal section. To achieve the above and other related objects, the present utility model provides a motor stator comprising: The winding comprises the enameled wire; The stator body comprises a stator groove; And the foaming coating fills a gap between the enameled wire and the stator groove after foaming and expanding. In an embodiment of the utility model, a limit groove is formed in the inner wall of the stator groove, the foam coating is heated and expanded to form a foam layer, then a gap between the enameled wire and the stator groove is filled, and the foam layer and the limit groove are complementarily matched in shape to form mechanical interlocking. In summary, in the utility model, the structure of the enameled wire comprises a wire core, an insulating layer and a foaming coating, the foaming coating releases gas through heating or chemical reaction to form a porous foam structure, and the volume expansion fills the gap between the enameled wire and the iron core groove. The expanded foaming layer is fixed through the dua