Patent ID: 8134322

Claim:
A motor control apparatus comprising: an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor that rotates a control object; pulse counting means for counting pulses of the output signal of the encoder; control means for detecting a rotation position of the rotor on the basis of a count of the pulse counting means during a drive control on the motor and sequentially switching a current supply phase of the motor so as to rotate the rotor to a target position; first current supply phase setting means for setting a current supply phase on the basis of the count of the pulse counting means in synchronism with output of a pulse of the output signal of the encoder during the drive control on the motor; and second current supply phase setting means for setting a current supply phase on the basis of the count of the pulse counting means in a fixed prescribed cycle until the rotor reaches the target position, wherein every time the first or second current supply phase setting means sets a current supply phase, the control means energizes a winding of the current supply phase thus set.