Brushless motor with phase cancelling leads for rotational speed detector pattern
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United States of America Patent
Stats
-
Oct 20, 1987
Grant Date -
N/A
app pub date -
Aug 4, 1986
filing date -
Aug 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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