| 摘要 |
A motor driver includes a positive switch element which connects drive windings of a motor to a positive power line and a negative switch element which connects the drive windings to a negative power line. Both of the switch elements are turned on/off based on a control signal supplied from a controller. The controller includes a waveform generator for outputting a driving waveform signal having sine-wave like current waveform and a polarity determiner for determining a polarity of back electromotive force of the drive windings. When the polarity is determined to be positive, the positive switch element is turned on/off, and when the polarity is negative, the negative switch element is turned on/off, so that the current running on the drive windings can shape like sine-wave.
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