Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1996-07-15
1998-07-07
Hall, Carl E.
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29759, H02K 1502
Patent
active
057749760
ABSTRACT:
A permanent magnet rotor for an electronically commutated motor (ECM) has a core, a plurality of magnetizable elements spaced around the core, and a thin-walled retaining shell which has been stretched around the core and magnetizable elements to hold the elements in position. The rotor is made by an inventive method which involves axially aligning the core and surrounding magnetizable elements with the retaining shell, and cold-pressing the retaining shell over the core and elements to sandwich the elements between the shell and core. The core and magnetizable elements serve as a mandrel about which the shell is reformed in a cold working operation. Other aspects of the invention include the fixturing apparatus used to align the core and magnetizable elements with the retaining shell, and apparatus which is used to evenly space the magnetizable elements around the core and hold the elements in position during at least a portion of the cold-pressing operation. Additional features of certain embodiments of the rotor of the present invention include end plates axially disposed adjacent the ends of the rotor core and magnetizable elements, and the use of adhesives between the core and magnetizable elements and/or the ends of the core and magnetizable elements and the end plates.
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patent: 4587721 (1986-05-01), Muller
patent: 4674178 (1987-06-01), Patel
patent: 4742259 (1988-05-01), Schaefer et al.
General Electric Company
Hall Carl E.
Traynham Wayne O.
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