H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/82
H02K 21/26 (2006.01) H02K 23/02 (2006.01) H02K 23/04 (2006.01)
Patent
CA 1115763
Case 2638 DYNAMOELECTRIC MACHINE WITH PERMANENT MAGNETS IN STATOR POLES ABSTRACT OF THE DISCLOSURE A dynamoelectric machine has a field structure which includes permanent magnets to provide a predeter- mined residual pole flux that self-excites the machine at start-up. A plurality of permanent magnets may be mounted in a groove on the pole face of each salient pole so as to provide a magnetic circuit therethrough. The permanent magnets are in substantial alignment with the pole face and spaced therefrom so as to direct a major portion of their flux across an air gap in the machine and thereby provide a predetermined residual pole flux. During the operation of the machine, the soft iron of the salient poles has an electromagnetically generated pole flux developed therein which moves through the pole face and crosses the air gap providing another magnetic circuit through the pole face parallel to the magnetic circuit of the permanent magnets. The field structure is novel in that it provides two parallel magnetic circuits which provide a predetermined residual pole flux to self-excite the machine while not appreciatively reducing the electromagnetically generated pole flux during machine operation.
329686
Hollitscher Herbert
Nesbitt John J.
Canadian General Electric Company Limited
Eckersley Raymond A.
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