Control circuit for inverter depending on one or several desired values - includes excitation producing unit for producing excitation current correlative from measured signal for each phase of induction motor prim. current

摘要

An oscillation component determination unit (11) is provided, for obtaining an oscillation component of the excitation current from the excitation correlative. A correction value determining unit (12) is provided for obtaining a correction value from the oscillation component of the excitation current. A desired value supply unit (13, 20) corrects at least one of the desired values using the correction value. The desired value supply unit also supplies the inverter with stator axes voltage desired values, which are obtained on the basis of the corrected desired values. USE/ADVANTAGE - Inverter e.g. voltage/frequency controlled pulse-width modulated type, for induction motor. Positively limits oscillation of motor currents.