Method of starting a sensorless motor
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United States of America Patent
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-
Sep 10, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1993
filing date -
Nov 30, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of starting a sensorless motor comprising a stator provided with three-phase stator coils to which an exciting current is supplied, and a rotor provided with a rotor magnet for obtaining a rotating torque by the electromagnetic interaction of the stator wherein a first stepping step and a second stepping step for starting the rotor at the time of starting the motor are carried out. In the early period of the second stepping step, a reverse exciting operation is carried out in which an exciting current is switched off from positive to negative or from negative to positive without including a cessation period in two-phase coils out of the three-phase stator coils.
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