Rotating electric motor with reduced cogging torque

Details Rotating electric motor with reduced cogging torque Rotating electric motor with reduced cogging torque

1985-07-30

1987-09-08

Skudy, R. S.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310198, H02K 300

Patent

active

046926461

ABSTRACT:
A rotating electric motor has a permanent magnet member of a circular form and an armature core made of a magnetic material. The permanent magnet member has a plurality of N and S poles positioned alternately around the rotary shaft of the motor, and the number of the poles is P which is an even number. The armature core has a plurality of teeth formed between two adjacent winding slots of the armature core, and the number of the teeth is T which is an integer not less than 2P. Overlapping winding coils of polyphase winding groups are wound in the winding slots of the armature core, and the number of the phases of the polyphase winding groups is H which is an integer not less than 2. The armature core has at least a pair of short-blocks and long-blocks, each of which is a group of teeth having at least one tooth and positioned sequentially. Each short-block has at least one short-tooth and no long-tooth, and each long-block has at least one long-tooth and no short-tooth, where the effective pitch of each short-tooth is smaller than D=(360/T) degrees and the effective pitch of each long-tooth is larger than D. Because of this arrangement, the phases of the winding slots of the armature core with the period of 1 pole pitch of the permanent magnet member are different from each other, and the cogging torque of the rotating electric motor is small. Preferably, dummy-slot portions are provided at least on the faces of the long-teeth of the armature core.

REFERENCES:
patent: 3230434 (1966-01-01), Bauerlein
patent: 3845334 (1974-10-01), Harada
patent: 4127787 (1978-11-01), Auinger
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patent: 4144470 (1979-03-01), Auinger
patent: 4163915 (1979-08-01), Fong
patent: 4280072 (1978-05-01), Gotou et al.
patent: 4284919 (1981-08-01), Auinger
patent: 4346335 (1982-08-01), McInnis
patent: 4348606 (1982-09-01), Hibino
patent: 4547713 (1985-10-01), Langley

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