Brushless motor with symmetrical leads for preventing signal distortion
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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 magnetizing member for rotation driving with N-poles and S-poles arranged alternately is formed on a flat plane portion of a rotor magnet, and a member for detecting the rotational speed with N-poles and S-poles arranged alternately at a smaller pitch and a magnetizing member for detecting the rotational position arranged at a spacing angle of 180.degree. are formed on a circumferential surface of the rotor magnet. Stator coils are located opposite the magnetizing member for rotation driving, and a detecting substrate surrounds the outer circumference of the rotor magnet. The detecting substrate is provided with a rotational speed detecting pattern (FG) and a rotational position detecting pattern (PG), and a pair of lead patterns are connected to both ends of the rotational speed detecting pattern and inclined with respect to the rotational direction, so as to cancel distorting signals from the position poles.
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Cited Art Landscape
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