Phase and frequency locked motor control system and method of motor control.

摘要

A phase and frequency locked motor control system for controlling phase and frequency operation of a disk drive spindle motor (12) comprises: a motor power stage circuit (32) for supplying power to the motor (12), and a commutation logic circuit (36) for controlling operation of the power stage; circuitry (40) for generating a motor signal representative of motor rotating frequency and phase; a reference circuit (28) for generating a reference signal representative of a reference rotating frequency and phase; a comparing circuit (38, 48) for comparing the motor signal with the reference signal and for generating an error signal representative of error between the motor signal frequency and phase and the reference signal frequency and phase; and an error responsive circuit (78) responsive to the error signal for generating a pulse width modulated motor control signal having a duty cycle representative of the error, and for coupling the motor control signal to the commutation logic circuit (36) for regulating operation of the power stage circuit (32) to drive the motor in phase and frequency locked relation with said reference signal.