Patent ID: 6885160

Claim:
A drive control device for controlling an electric rotational actuator which moves a driver, comprising: a reference comparison signal generation circuit for generating a reference comparison signal; a detection circuit for detecting the speed of said actuator and outputting this as a speed detection signal; a speed designation circuit of said actuator for generating a designated speed value; a speed comparison circuit for comparing the speed detection signal with the designated speed value and generating a designated speed signal; a rotation control circuit of said actuator; and a phase comparison circuit for comparing the phase of said reference comparison signal and the phase of said designated speed signal and outputting the comparison result to said rotation control circuit as a phase difference signal; wherein said rotation control circuit controls the speed of said actuator to conform with said designated speed value based on said phase difference signal, and wherein said reference comparison signal generation circuit divides the fundamental frequency and outputs a division ratio as the reference comparison signal, and the output of said rotation control circuit is altered in accordance with the phase comparison result.