POSITION SENSOR NOISE-REDUCTION SCHEME FOR MAGNETIC BEARING CONTROL SYSTEMS

摘要

A magnetic bearing system must rely on position feedback information for control.Position signal noise degrades performance of the magnetic bearing control andavoidance of the introduction of noise can result in increased controller performance. Adigitally controlled magnetic bearing system requires anti-alias filtering on all sampledchannels to attenuate noise above the Nyquist rate to a low level, compared with theposition signal. One cost of signal filtering is signal phase loss which diminishes theperformance of a real time control system as used in magnetic bearing. Significantnoise often originates from switching amplifiers common in magnetic bearing systems.The scheme presented reduces the degree of filtering, including anti-alias filtering,required to attenuate a significant component of noise originating from switchingamplifiers.