JP-2026076285-A - Stator for rotating electric machine, rotor for rotating electric machine, foam adhesive sheet, method for manufacturing a stator for a rotating electric machine, and method for manufacturing a rotor for a rotating electric machine

JP2026076285AJP 2026076285 AJP2026076285 AJP 2026076285AJP-2026076285-A

Abstract

[Problem] This disclosure provides a stator and rotor for a rotating electric machine that have good heat dissipation performance for heat generated from the coil. [Solution] The present disclosure provides a stator 10 for a rotating electric machine, comprising a stator core 1, coils 3 arranged in slots 2 of the stator core, and an adhesive sheet 4 arranged between the stator core and the coils, wherein the adhesive sheet comprises a foamed layer 11 and a non-foamed layer 12, the ratio of the thickness of the foamed layer to the thickness of the non-foamed layer being 1 or more and 29 or less, and the adhesive sheet is arranged such that the non-foamed layer faces the coil side and the foamed layer faces the stator core side. [Selection Diagram] Figure 1

Inventors

星健太郎
前田菜穂
光武直哉
長谷川泉

Assignees

大日本印刷株式会社

Dates

Publication Date: 20260511
Application Date: 20260205
Priority Date: 20230724

Claims (1)

Stator core and A coil arranged in the slot of the stator core, An adhesive sheet is placed between the stator core and the coil, A stator for a rotating electric machine having, The adhesive sheet has a foamed layer and a non-foamed layer. The ratio of the thickness of the foamed layer to the thickness of the non-foamed layer is 1 or more and 29 or less. The adhesive sheet is arranged such that the non-foamed layer faces the coil side and the foamed layer faces the stator core side, in a stator for a rotating electric machine.

Description

This disclosure relates to a stator for a rotating electric machine, a rotor for a rotating electric machine, a foamed adhesive sheet, a method for manufacturing a stator for a rotating electric machine, and a method for manufacturing a rotor for a rotating electric machine. Generally, vehicles such as hybrid and electric vehicles are equipped with a rotating electric machine that can function as both a motor and a generator. Furthermore, generally, a rotating electric machine comprises a stator as a stationary element and a rotor as a rotor that rotates with a predetermined gap relative to the stator. In the stator, coils are inserted into slots in the stator core, and an insulating sheet is placed between the inner circumferential surface of the stator core slots and the coils for insulation. Furthermore, in the rotor of a wound-field motor, coils are wound around the teeth of the rotor core, or coils are inserted between the teeth of the rotor core, i.e., in the slots of the rotor core, and an insulating sheet is placed between the teeth of the rotor core and the coils for insulation. Conventionally, insulating paper has been used as the insulating sheet, and a method has been employed in which the insulating paper is fixed between the stator core or rotor core and the coil using liquid adhesive. On the other hand, in recent years, it has been proposed to use adhesive sheets containing foaming agents (foaming adhesive sheets) instead of liquid adhesives. For example, Patent Document 1 discloses a motor in which magnets are fixed to the rotor core using an adhesive tape that expands when heated, although this is not a technique for fixing coils to the stator core or rotor core. For example, Patent Document 2 discloses a stator in which coils are fixed to the stator core using insulating paper having foamed layers on both sides. For example, Patent Document 3 discloses an insulating sheet for fixing coils to a stator core, in which the insulating sheet has an insulating base material, a foamed resin layer, and a non-foamed resin layer, and the insulating sheet is folded so that the non-foamed resin layer is positioned facing the wall surface of the stator core. Patent No. 6274540Japanese Patent Publication No. 2022-135608Japanese Patent Publication No. 2021-197888 This is a schematic plan view illustrating a stator for a rotating electric machine in this disclosure.This is a schematic plan view illustrating a stator for a rotating electric machine in this disclosure.This is a schematic plan view illustrating a stator for a rotating electric machine in this disclosure.This graph illustrates a stress-strain curve.This is a schematic plan view illustrating a rotor for a rotating electric machine in this disclosure.This is a schematic cross-sectional view illustrating an example of a foamed adhesive sheet in this disclosure.This is a schematic cross-sectional view illustrating an example of a foamed adhesive sheet in this disclosure.This is a schematic cross-sectional view illustrating an example of a foamed adhesive sheet in this disclosure.This is a schematic cross-sectional view illustrating the tensile shear bond strength test method for the second adhesive layer after curing.This is a schematic cross-sectional view illustrating the tensile shear bond strength test method for the first adhesive layer after foam curing.This is a schematic cross-sectional view illustrating the tensile shear bond strength test method for the first adhesive layer after foam curing.This is a schematic cross-sectional view illustrating the tensile shear adhesive strength test method for foamed adhesive sheets after foaming and curing.This is a process diagram illustrating a method for manufacturing a stator for a rotating electric machine in this disclosure.This is a process diagram illustrating the manufacturing method of a rotor for a rotating electric machine in this disclosure. The embodiments of this disclosure will be described below with reference to the drawings and other illustrations. However, this disclosure can be implemented in many different ways and should not be interpreted as being limited to the embodiments described below. Furthermore, while the drawings may schematically represent the width, thickness, shape, etc., of parts in order to clarify the explanation, these are merely examples and should not limit the interpretation of this disclosure. In addition, in this specification and the drawings, elements similar to those described above in previously shown drawings will be denoted by the same reference numerals, and detailed explanations may be omitted as appropriate. In this specification, when describing a configuration in which one component is placed on top of another component, unless otherwise specified, the terms "above" or "below" include both cases: the other component being placed directly above or below the component in contact with it, and the other component being placed above or below the compo