Re-Examination to adjustment the rotor magnetic field observer in the induction motor

Abstract

Wide usage of drives based on induction motors has put forward the problem of asynchronous motor torque and velocity maximum utilization. The important move in this direction is a fine adjustment of the rotor magnetic flux observer. The observer adjustment technique is put forward. The criterion of optimality is constancy of acceleration providing magnitude constancy of stator current active and magnetizing components. It is indicated that non-optimal tuning of the magnetic flux observer creates a transient response caused by variation of magnetic and active components of the stator current resulting in motor different acceleration times. The parameters of this process can be used for fine tuning of the observer which, among other things, considers the variation of the time constants originating from the drive's magnetic circuit saturation. Implementation of rotor magnetic flux observer fine adjustment is of a critical importance for asynchronous motor torque and velocity maximum utilization.