Method of manufacturing an electric rotating machine

Details Method of manufacturing an electric rotating machine Method of manufacturing an electric rotating machine

1997-04-18

1999-03-16

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

310 42, 310154, H02K 1514

Patent

active

058814469

ABSTRACT:
An electric rotating machine and manufacturing method of the same is provided that can securely press-fit magnetic poles against an inner circumference of a yoke with a cylindrical body. By directly contacting a first and second end portions of the cylindrical body and moving the same relatively, the diameter of the cylindrical body widens in the outer radial direction to press-fit the magnetic poles against the inner circumference of the yoke. Thus, the variation of the inner diameter of the magnetic poles that occurs due to the dimensional error in permanent magnet thickness and inner diameter of the yoke is absorbed by the relative movement of the first and second end portions. This stabilizes the fixing force of the magnet, and allows the magnet to be securely fixed to the yoke without excessive stress on the cylindrical body. Furthermore, the displacement of the magnetic poles can be restricted by bending axial ends of the cylindrical body radially outwardly.

REFERENCES:
patent: 4372035 (1983-02-01), McMillen
patent: 4707630 (1987-11-01), Tomite et al.
patent: 4850100 (1989-07-01), Stokes
patent: 5105114 (1992-04-01), Sickle et al.
patent: 5201111 (1993-04-01), Prohaska
patent: 5475276 (1995-12-01), Shiga et al.
Patent Abstract of Japan, vol. 16, No. 279 (E-1220), Jun./1992 re JP-A 04067756. 61218349. 61010950. 61196747. 611702060.

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