PURPOSE: To appropriately feedback-control the rotation of a DC motor with a simple constitution by integrating the voltage applied across both ends of the DC motor and detecting the integrated voltage in a prescribed phase of an alternating current, and then, feedback-controlling the phase controlling timing.
CONSTITUTION: After the phase of an alternating current is controlled by means of a phase controlling means M1, the phase-controlled alternating current is supplied to a DC motor MM after the current is full- or half-wave rectified by means of a rectifying means M2. The voltage applied across both ends of the motor MM is integrated by means of an integration means M3 and the integrated voltage is detected by means of a voltage detecting means M4 in a prescribed phase of the alternating current. A feedback-controlling means M5 feedback-controls the phase controlling timing of the phase controlling means M1 based on the detected voltage. In addition, the voltage detecting means M4 is suitable for detecting the voltage in a phase lagged by a prescribed phase from the turning on timing of the alternating current by phase control.
KATO AKIJI
NOMURA TAKESHI
