Brushless motor with center leads for preventing signal distortion
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United States of America Patent
Stats
-
Apr 12, 1988
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 comprises a main magnetizing member with alternate N-poles and S-poles and a subsidiary magnetizing member for detecting rotational speed disposed at an inner side and having N-poles and S-poles arranged at a smaller pitch in comparison to the main magnetizing member. A stationary plate is provided with stator coils opposed to the main magnetizing member and a detecting substrate has a pattern in opposition to the subsidiary magnetizing member for detecting rotational speed. The detecting substrate is installed on the stator coils, and leads from the detecting substrate extend through the center of the stationary plate towards the rear side thereof, to avoid the signal distortion of prior art designs.
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