Motorumdrehungszahl-Regelgerät

摘要

A motor rotation control apparatus employs a comb filter circuit (10) to filter out a signal component and its higher harmonics. An error signal (DS) indicative of an error between actual and target conditions of rotation of the motor is applied to the comb filter circuit (10) after a direct current component thereof is removed. The filtered signal and the error signal are added in a circuit (90) which produces a control signal used to control rotation of the motor (50). Predetermined successive portions (samples) of the error signal may each be divided into a first digital signal portion having a predetermined number of upper bits of data and a second digital signal portion having the remaining lower bits of data. The lower bits are delayed a predetermined time and added to the error signal to compensate for lower bits of data which may be ignored in a digital-to-analog converter, operable on a limited number of bits, to provide an analog control signal used to control rotation of the motor.