Rotating electric motor with reduced cogging torque

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

1985-07-11

1987-09-08

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310198, 310216, H02K 300

Patent

active

046926453

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 axis 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 one short-block and one long-block, each of which consists of a group of teeth having at least two teeth positioned sequentially. The short-block has at least one short-tooth, and at least one standard-tooth and no long-teeth, and the long-block has at least one long-tooth, at least one standard-tooth and no short-teeth, where the effective pitch of the standard-teeth is equal to D=(360/T) degrees and, the effective pitches of the short-teeth are smaller than D and the effective pitches of the long-teeth are larger than D. Because of the above arrangement, the phases of the winding slots of the armature core with a period of 1 pole pitch of the permanent magnet member are different with respect to each other, and the cogging torque of the rotating electric motor is small.

REFERENCES:
patent: 3230434 (1966-01-01), Bauerlein
patent: 3235762 (1966-02-01), Brammerlo
patent: 3845334 (1974-10-01), Harada
patent: 3942055 (1976-03-01), Hoffmeyer
patent: 4130769 (1978-12-01), Karube
patent: 4163915 (1979-08-01), Fong
patent: 4280072 (1978-05-01), Gotou et al.
patent: 4341970 (1982-07-01), Auinger
"An Analysis of the Cogging Torque of a DC Motor and a New Reducing Technique", Gotou, Makoto, Member & Kazutsugu Kobayashi, Member (Wireless Research Lab, Matsushita), pp. 711-718.

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