Brushless motor drive device
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United States of America Patent
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-
Jan 16, 2007
Grant Date -
N/A
app pub date -
Jan 24, 2006
filing date -
Jan 24, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brushless motor drive device has a signal synthesizing circuit for converting a plurality of sensing signals into a plurality of drive signals so as to determine an amplitude of each of the drive signals in accordance with a current error signal. The sensing signals are generated by a sensing circuit in response to variations in a magnetic field of a brushless multi-phase motor. The current error signal is representative of a difference between a current command signal and a motor drive current. The signal synthesizing circuit is characterized by including a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. The calibrating circuit includes a differential amplifying circuit, a rectifying circuit, a filtering circuit, and a dividing circuit.
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