Patent ID: 8810172

Claim:
A motor control apparatus comprising: a rotation direction sensor that detects a rotation direction of a motor; an inverter circuit that is formed of switching elements having respective free-wheeling diodes and connected in multi-phase bridges to energize coils of the motor; and a control circuit that controls the switching elements forming the inverter circuit by PWM-control, which performs pulse-width modulation, based on a target rotation direction supplied from an external side as a command, wherein the control circuit extends on-periods of high-side switching elements forming the inverter circuit to an advance phase side, when a direction disagreement condition, in which the target rotation direction and an actual rotation direction of the motor detected by the rotation detection sensor are in disagreement, is detected, the control circuit PWM-controls the inverter circuit by 120-degree energization, when a direction agreement condition, in which the target rotation direction and the actual rotation direction are in agreement, is detected; and the control circuit PWM-controls the inverter circuit by 180-degree energization, when the direction disagreement condition is detected.