Patent ID: 6605920
Filing Date: 2003-08-12
Classification: G21K,H02P

Abstract:
A digital signal processing method for controlling the speed and phase of a motor comprising the steps of:inputting a reference signal having a frequency and relative phase indicative of a time based signal; modifying said reference signal to introduce a slew-rate limited portion of each cycle of said reference signal; inputting a feedback signal having a frequency and relative phase indicative of the operation of said motor; modifying said feedback signal to introduce a slew-rate limited portion of each cycle of said feedback signal; analyzing said modified reference signal and said feedback signal to determine said frequency of said modified reference signal and of said modified feedback signal and said relative phase between said modified reference signal and said modified feedback signal; and outputting control signals to said motor for adjusting said speed and phase of said motor based on said frequency determination and said relative phase.