Patent ID: 6933690
Filing Date: 2005-08-23
Classification: G11B,H02P

Abstract:
1. A motor driver comprising: a driving control circuit that feeds n-phase driving output currents to a motor provided with n position detecting elements, for detecting a rotation position of a rotor, and with n-phase coils; a position detection circuit that outputs position signals that indicate the rotation position of the rotor on a basis of outputs of the position detecting elements; a sinusoidal signal generation circuit that generates n-phase pseudo-sinusoidal signals on a basis of the position signals; and a PWM conversion circuit that feeds the driving control circuit with n-phase PWM signals obtained by performing PWM conversion individually on the n-phase pseudo-sinusoidal signals from the sinusoidal signal generation circuit, wherein the position detection circuit feeds the position signals to the sinusoidal signal generation circuit after normalizing an amplitude of the position signals.