Method of manufacture of a magnetic rotor core member for a...

Details Method of manufacture of a magnetic rotor core member for a... Method of manufacture of a magnetic rotor core member for a...

H - Electricity

02

K

26/113

H02K 15/02 (2006.01) H02K 19/22 (2006.01)

Patent

CA 1292610

METHOD OF MANUFACTURE OF A MAGNETIC ROTOR CORE MEMBER FOR A DYNAMOELECTRIC MACHINE Abstract of the Disclosure A method of manufacturing a magnetic rotor core member for a rotating-field dynamoelectric machine, particularly a small alternator, including the steps of: hot forging a segment of steel bar stock into a core blank approximating the external configuration desired for the rotor core member but with the pole piece fingers shorter than required for the finished pole pieces; de-burring the core blank; coining the core blank into closer conformation to the desired core member configuration; gradually cooling the core blank; rough machining only two opposed surfaces of the hub and base to assure a controlled uniform volume for subsequent processing; cold punching a shaft aperture through the hub of the core blank and simultaneously ironing the pole piece fingers into close conformity with the required finished dimensions, in particular lengthening the fingers; and, finally, cold-compressing the core blank to finished form as a rotor core member in a single cold compression step.

540167

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