| 摘要 |
PURPOSE:To improve stability under low speed rotation by providing a single direction drive limiting control means for controlling only drive and regenerative motion in the single direction rotation of motor. CONSTITUTION:A limiter circuit (single direction drive limiting control means) 12 generates positive polarity corresponding to only a positive direction signal in an output signal VREF of a current control circuit 5 and provides zero output for a negative direction. Moreover, the limiter circuit also limits the upper limit of an output. That is, since the limiter circuit 12 provides the zero output even when an output of the current control circuit 5 is inverted to the negative polarity, a control signal associated with reverse rotation of a DC motor 1 is cut off by the limiter circuit 12 and therefore reverse rotation of DC motor 1 is never generated in this control system. Thereby, stability under low speed rotation can be improved. |
