ROTARY ELECTRIC MACHINE AND METHOD FOR MANUFACTURING ROTARY ELECTRIC MACHINE STATOR

• US 20150130311A1
• Filed: 04/14/2014
• Published: 05/14/2015
• Est. Priority Date: 11/08/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: MURAKAMI, Tadashi, OJIMA, Kouichi, NISHIMURA, Shinji
• Granted Patent: US 10,505,410 B2
• Time in Patent Office: Days
• US Class Current: 310/89
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 15/14 Casings; Enclosures; Supports
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A plurality of core blocks that are arranged into an annular shape are inserted into and fixed to a cylindrical frame, and are disposed inside the frame, a bolt passage member that is produced as a solid body and that has a bolt passage aperture that passes through in a longitudinal direction is fixed by welding to an outer circumferential surface of the frame such that the longitudinal direction thereof is oriented in the axial direction of the frame, and a stator is held on the housing by fastening a bolt that is passed through the bolt passage aperture into a fixing portion that is formed on the housing.

Claims

1. A rotary electric machine comprising:

a housing;

a rotor that is rotatably disposed inside said housing;

a stator that comprises;

a stator core that is configured by arranging a plurality of core blocks into an annular shape, said plurality of core blocks each being prepared by laminating and integrating a predetermined number of magnetic steel plates, and comprising a circular arc-shaped yoke portion, and a tooth portion that protrudes radially inward from an inner circumferential wall surface of said yoke portion; and

coils that are wound onto said tooth portions of each of said plurality of core blocks,

said stator being held on said housing so as to surround said rotor;

a frame that is produced so as to have a cylindrical shape, said plurality of core blocks that are arranged into said annular shape being inserted into and fixed to an internal portion thereof; and

a bolt passage member that is produced as a solid body, that is fixed to an outer circumferential surface of said frame by welding such that a longitudinal direction thereof is oriented in an axial direction of said frame, and that comprises a bolt passage aperture that passes through in said longitudinal direction,

wherein said stator is held on said housing by fastening a bolt that is passed through said bolt passage aperture from a first longitudinal end of said bolt passage member into a fixing portion that is formed on said housing.

2. The rotary electric machine according to claim 1, wherein said bolt passage member is produced using sheet metal.

3. The rotary electric machine according to claim 1, wherein:

two axial end surfaces of said frame and two longitudinal end surfaces of said bolt passage member that is fixed to said frame are configured so as to be flush; and

said two axial end surfaces of said frame and said two longitudinal end surfaces of said bolt passage member respectively contact said bolt head portion and said fixing portion.

4. The rotary electric machine according to claim 1, wherein:

said bolt passage member is formed so as to protrude slightly beyond a first axial end of said frame; and

a protruding portion is formed so as to extend radially inward from a first axial end portion of said bolt passage member so as to be positioned axially outside said yoke portion.

5. The rotary electric machine according to claim 1, wherein:

a dovetail groove is formed on an outer circumferential surface of said yoke portion so as to have a groove direction oriented in an axial direction;

an interfitting portion is formed so as to protrude from an outer circumferential surface of said bolt passage member; and

said bolt passage member is fixed to said frame by said interfitting portion being fitted into said dovetail groove.

6. The rotary electric machine according to claim 1, wherein a mounting surface of said bolt passage member that contacts said outer circumferential surface of said frame is formed so as to have a curved surface that has an identical radius of curvature to said outer circumferential surface of said frame.

7. A method for manufacturing a rotary electric machine stator comprising:

a stator core that is configured by arranging a plurality of core blocks into an annular shape and inserting and fixing said plurality of core blocks into a cylindrical frame, said plurality of core blocks each being prepared by laminating and integrating a predetermined number of magnetic steel plates, and comprising a circular arc-shaped yoke portion, and a tooth portion that protrudes radially inward from an inner circumferential wall surface of said yoke portion;

coils that are wound onto said tooth portions of each of said plurality of core blocks; and

a bolt passage member that is produced as a solid body, that is fixed to an outer circumferential surface of said frame by welding such that a longitudinal direction thereof is oriented in an axial direction of said frame, and that comprises a bolt passage aperture that passes through in said longitudinal direction,

said method for manufacturing a rotary electric machine stator comprising steps of;

winding said coils onto each of said tooth portions of said plurality of core blocks;

arranging said plurality of core blocks onto which said coils have been wound into an annular pattern, and inserting and fixing said plurality of core blocks into said frame; and

fixing said bolt passage member by welding onto said outer circumferential surface of said frame into which said plurality of core blocks have been inserted and fixed such that a longitudinal direction of said bolt passage member is oriented in an axial direction of said frame.