Three-phase brushless motor
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United States of America Patent
Stats
-
Jan 27, 1987
Issued Date -
N/A
app pub date -
Jan 24, 1986
filing date -
Jan 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A three-phase brushless motor in which two electromagnetic transducer elements for detecting the rotational position of a rotor are disposed so as to produce a composite signal having a phase difference of 120.degree. relative to the output signals from the electromagnetic transducer elements, and the output signals from the two electromagnetic transducer elements and the composite signal are used to determine drive currents fed to the stator coils. The rotor includes auxiliary magnetic poles having opposite polarities to those of main magnetic poles and are disposed in the rotor opposite the electromagnetic transducer elements at positions with an electrical angle of .+-.45.degree. from the boundary between respective North poles and South poles of the main magnetic poles, whereby waveforms of the composite signal and the output signals from the electromagnetic transducer elements have a steep slope at zero crossing points.
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Cited Art Landscape
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