| 摘要 |
PURPOSE:To reduce the effect which the noise generated by intermittence of a motor current produces externally. CONSTITUTION:A control device 5 of a current-driven stepping motor 1 is provided with a frequency control means 10 which conducts an operation for changing the frequency of a current control signal periodically. The frequency of the noise generated by making a motor current intermittent is thereby made to change with time and the effect of the noise is diffused. Besides, a frequency changing means which detectes a reception frequency of a receiver such as a radio placed in the vicinity of the stepping motor and changes the frequency of the current control signal in correspondence to the reception frequency is provided instead of the frequency control means 10. Thereby the frequency component of the noise is made different from the frequency of the receiver and thus the effect of the noise can be eliminated. |
