| 摘要 |
PURPOSE:To enable a motor to generate stable rotating speed or torque, by correcting the width of a driving pulse signal by the width corresponding to the fluctuated portion of the current flowing through the motor. CONSTITUTION:A PWM circuit 2 outputs a driving pulse signal having a pulse width corresponding to an inputted control value signal. A driving signal correction circuit 3 outputs a motor driving pulse signal depending on the difference between a driving pulse signal inputted from the PWM circuit 2 and a current feedback pulse signal to a motor driving power amplification circuit 4. On the other hand, a conversion circuit 7 outputs a current feedback pulse signal corresponding to the motor current detected by a motor current detector 6 and synchronized with a driving pulse signal. In this way, without being affected by the fluctuation, etc., of power voltage a designated rotating speed or torque can be generated stably.
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