Patent ID: 6597146
Filing Date: 2003-07-22
Classification: G05B

Abstract:
An apparatus for reducing cyclic noise in a motor drive system where the drive system subtracts a velocity feedback signal from a velocity command to generate a velocity error signal and uses the velocity error signal to control other drive system components, the apparatus comprising:a frequency identifier that receives a velocity feedback signal and identifies unintended frequencies of unintended components of the feedback signal where each unintended component is characterized by a component specific phase and amplitude; a sine generator that generates a combined signal characterized by a separate sinusoidal component corresponding to each of the undesirable frequencies; a tuning signal identifier linked to at least one system component output and providing a tuning signal corresponding to the at least one component output; an LMS module that mathematically combines the combined signal and the tuning signal to generate a compensation signal characterized by a separate component corresponding to each identified unintended frequency where each separate component of the compensation signal is essentially in phase with and has an amplitude similar to a corresponding unintended component; and a regulator module that mathematically combines the velocity error signal and the compensation signal to generate a corrected signal used to control other drive components.