| 摘要 |
PURPOSE:To prevent generation of torque ripple due to variation of load torque by adjusting a feedback amount in a negative feedback circuit corresponding to variation of the load torque of a motor. CONSTITUTION:A drive circuit 2 amplifies control signal supplied the amplified signal as a coil current to a motor 1. A negative feedback circuit 3 applies negative feedback so as to remove torque ripple in the motor 1. On the other hand, an adjustment circuit 4 adjusts the feedback amount of the negative feedback circuit 3 corresponding to load torque of the motor 1. Further a correction circuit 5 superposes DC component to the output of the negative feedback circuit 3 and sets the operating point with higher accuracy. In this constitution, generation of torque ripples due to variation of the load torque can be prevented. |
