Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-08-04
1987-10-20
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310171, 310268, 310DIG6, H02K 2124
Patent
active
047016507
ABSTRACT:
In a brushless motor, a rotor magnet is rotatably supported and comprises a main magnetizing member for rotation driving with N-poles and S-poles alternately arranged, and a subsidiary magnetizing member for detecting the rotatonal speed with N-poles and S-poles alternately arranged at smaller pitch than that of the main magnetizing member. A stationary plate is provided with stator coils opposed to the main magnetizing member for rotation driving and a detecting substrate having a pattern in opposition to the subsidiary magnetizing member. A pair of leads connected to the pattern of the detecting substrate are arranged at the same angle as the angular interval of two consecutive magnetic poles with the same polarity in the main magnetizing member for rotation driving or at an angle corresponding to an integer multiple of the angular interval. This results in phase cancellation of distorting signals from the driving poles.
REFERENCES:
patent: 4093897 (1978-06-01), Fujita et al.
patent: 4260920 (1981-04-01), Nakamura et al.
patent: 4394594 (1983-07-01), Schmider
Alps Electric Co. ,Ltd.
Rebsch D. L.
Salce Patrick R.
Shoup Guy W.
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