| 摘要 |
PURPOSE:To reduce the torque ripple of a motor by detecting the state of the final transistor for driving a motor and correcting a waveform distortion due to the charge storing time. CONSTITUTION:When a transistor 6a is turned from ON to OFF by a signal U, the OFF state of the transistor 6a is detected by a photocoupler 16 connected in parallel with a transistor 6b, the signal -Ud of an ON-ready circuit 5b is then set to high to turn ON the transistor 6b, and the polarity of the current Iu is inverted. The logic voltage state of the connecting point of a pair of transistors connected in series to supply a drive current to the motor is detected, the timing of the transistor to be turned ON next in accordance with the voltage is corrected to reduce the torque ripple. |
