METHOD AND DEVICE FOR ELIMINATING THE EFFECT OF PERIODIC DISTURBANCE VARIABLES HAVING A KNOWN, VARIABLE FREQUENCY

摘要

A signal which is dependent solely on thedisturbance variable is selected by means of a filterand fed to a disturbance detector. This disturbancedetector simulates the steady and alternating component(sine component) of the selected signal, as well as asignal (cosine component) phase-leading by 90° with thelatter signal. The correction signal required toexactly compensate for the disturbance variable isdetermined from the sine and cosine component of theperiodic disturbance signal component by means offrequency-controlled function generators and a complexphasor calculation.