Brushless DC motor

Details Brushless DC motor Brushless DC motor

1987-12-01

1989-10-17

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310179, 310187, 310254, 318254, H02K 110

Patent

active

048749753

ABSTRACT:
A brushless DC motor having a number of armature poles which is neither a multiple nor a submultiple of the number of field poles, thereby providing a relatively high cogging-ripple frequency. The field pole faces, which are generally arcuate in cross-section, have centrally disposed depressions. These depressions reduce the torque exerted by the armature when pole boundaries of the armature pass by the centers of the field poles. This reduces both torque ripple and cogging ripple and it doubles the frequency of torque ripple.

REFERENCES:
patent: 2110719 (1938-03-01), Williamson
patent: 3860843 (1975-01-01), Kawasaki
patent: 4280072 (1981-07-01), Gotou
patent: 4386287 (1983-05-01), Karasawa et al.
patent: 4393320 (1983-07-01), Anderson
patent: 4405883 (1983-09-01), Ashida
patent: 4405885 (1983-09-01), Okamoto
patent: 4451752 (1984-05-01), Tahara
patent: 4692645 (1987-09-01), Gotou
patent: 4692646 (1987-09-01), Gotou

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