Method for manufacturing a dynamoelectric device

Details Method for manufacturing a dynamoelectric device Method for manufacturing a dynamoelectric device

1992-02-19

1993-06-22

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming electrical articles by shaping electroconductive...

264113, 264126, 264DIG58, 310156, B29C 4514, H22K 2136

Patent

active

052215032

ABSTRACT:
A method of manufacturing an electromagnetic device having regions of ferromagnetic material and permanent magnet material is disclosed. The electromagnetic assemblies of this invention utilize thermoplastic encapsulated iron powders and epoxy resin encapsulated permanent magnet powder. A motor frame and permanent magnet assembly is formed in a first example, while a permanent rotor assembly is formed in a second. The motor frame and permanent magnet assembly has a ferromagnetic frame defined by a region of encapsulated iron powder and an annular array of permanent magnets defined by a region of encapsulated permanent magnet material. The permanent magnet rotor assembly has a ferromagnetic core defined by a region of encapsulated iron powder and a permanent magnet shell defined by a region of encapsulated permanent magnet material. In the processing of both the motor frame and permanent magnet assembly and the rotor assembly, annular inner and outer punch elements coaxial with a central core rod are supported within a heated die casing for independent extension and retraction along the central axis. The inner and outer punch elements are retracted to form cavities which are filled with the encapsulated permanent magnet and ferrous powders, respectively, for the motor frame and permanent magnet assembly, while the reverse exists for the manufacture of the permanent magnet rotor assembly. Coaxial pressing mechanisms individually and concurrently compress the powders to fuse and compact them to a predetermined axial length.

REFERENCES:
patent: 3858308 (1975-01-01), Peterson
patent: 4547758 (1985-10-01), Shimizu et al.
patent: 4832891 (1989-05-01), Kass
patent: 4845837 (1989-07-01), Lloyd
patent: 4973872 (1990-11-01), Dohogne
patent: 5004577 (1991-04-01), Ward
patent: 5017318 (1991-05-01), Vanderbilt
patent: 5032335 (1991-07-01), Wilson
patent: 5043123 (1991-08-01), Gormanns et al.
Parent Application Ward et al., U.S. Ser. No. 07/783,466 filed Oct. 28, 1991.

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