Closed-loop feedback control system having an adaptive filter

摘要

A closed-loop feedback control system is disclosed for controlling an operation of a load (4). An actual operation signal is subtracted from a reference operation signal to produce a resultant signal which is used to control the operation of the load (4). A filter unit, such as a notch filter, operates to suppress any machine resonance frequencies found in the operation signal due to load fluctuations, machine variations, operating environment changes, deterioration with age, etc. A filter coefficient of the filter unit is adjusted so that any fluctuation in the resonance frequency can be suppressed effectively. IMAGE