Redundant motor driving circuit

A motor driving circuit has a driving device (37, 38) for receiving a driving signal and driving a motor based on the driving signal. When the motor is driven, the motor is energized through a first control circuit (32, 33) and a second control circuit (34, 35), each of which can output a signal for driving the motor. When it is determined that the energization is not performed through one of the control circuits, the other control circuit is selected.