Motor Driving Apparatus

A motor having plural-phase windings and a rotor includes a position detector, a state determining device, an activation controlling device, and a switching controlling device. The position detecting device detects the position of the rotor according to a comparison signal obtained by comparing terminal voltages of the windings in a non-activation phase with a center tap voltage of a common potential of the plural-phase windings and outputting a position detection signal. The state determining device detects the state of the rotor and outputs the result obtained by comparing the position detection signal with a predetermined value. The activation controlling device performs activation control of the windings by setting a leading phase of an activation control signal with respect to the position detection signal when the state determining device outputs a first output signal, and performs activation control of the windings by canceling the leading phase of an activation control signal with respect to the position detection signal when the state determining device outputs a second output signal. The switching controlling device outputs a drive signal for performing high-frequency switching control according to a command signal to the activation controlling device.