Improved direct torque and flux control of induction motor drive

Abstract

Purpose

The aim of the paper is to conduct an analytical study of a new method of induction motor torque and flux direct control with nonlinear controllers.

Design/methodology/approach

The method is based on the inverter state predictive determination in order to minimize the torque and flux errors.

Findings

The proposed method allows one to eliminate known DTC disadvantages, i.e. the hexagonal flux shape and nonsinusoidal current at a low motor speed, and also secures a decrease of torque and flux pulsation.

Practical implications

This new method enables a more precise reproduction of the motor torque and flux command signals, working with the same sampling frequency of the control processor as in the case of the standard DTC method. The decreased torque pulsations cause a decrease of the motor speed pulsation.

Originality/value

An innovative optimal control method is presented. The correctness of the initial assumptions as well as the expected final results have been verified in practice.

Citation

Sikorski, A. and Korzeniewski, M. (2007), "Improved direct torque and flux control of induction motor drive", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 26 No. 4, pp. 1204-1217. https://doi.org/10.1108/03321640710756500