Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-07-23
1994-07-19
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, H02K 122
Patent
active
053312457
ABSTRACT:
A brushless direct current motor has a substantially cylindrical, external permanent magnet rotor having a plurality of north poles and south poles. The rotor surrounds a substantially cylindrical stator provided with a plurality of main poles between which auxiliary poles are interspersed. An annular gap is defined between the rotor and the stator. To reduce magnetic or reluctance caused fluctuation of the motor torque, each main pole of the stator has an angular extent which substantially corresponds to that of a rotor pole. Furthermore, the stator periphery is provided with protuberances arranged such that permanently magnetically caused components of torque ripple are reduced.
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Burgbacher Martin
Hermann Michael
Budd Mark O.
Papst Licensing GmbH
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