Brushless motor

Details Brushless motor Brushless motor

1987-12-16

1990-02-20

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310179, 310258, H02K 122

Patent

active

049029240

ABSTRACT:
A brushless motor includes a rotor having a multipolar magnet with n-number of magnetic poles and a stator yoke having a plurality of field coils disposed at a position opposing the multipolar magnet. The stator yoke of the brushless motor is provided with a magnetic-resistance varying portion to improve the smoothness of rotation of the rotor.

REFERENCES:
patent: 3407320 (1968-10-01), McLean
patent: 3496393 (1970-02-01), Reifman et al.
patent: 3504253 (1970-03-01), Kavanaugh
patent: 3549918 (1970-12-01), Hendrik Croymans et al.
patent: 3790834 (1974-02-01), Tanaka
patent: 4130769 (1978-12-01), Karube
patent: 4181867 (1980-01-01), Muller
patent: 4260920 (1981-04-01), Nakamura et al.
patent: 4599561 (1986-07-01), Takahashi et al.
patent: 4656381 (1987-04-01), Komatsu
patent: 4703235 (1987-10-01), Wisner
Nobuyoshi Yokobori, Minoru Koda and Kazumi Iwasaki, "Direct-Drive Capstan Motor for VHS VTRs", National Technical Report, vol. 28, No. 3, Jun. 1982.

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