Power electronics applied to the control of AC induction machines

Abstract

This thesis is concerned with the class of modern controllable drives which comprise a static DC link inverter and a conventional cage induction machine. The emphasis is on the most sophisticated of the array of techniques that may be used in such drives - synthesis of a variable voltage/variable frequency motor supply, by timing the inverter switching instants according to a sinusoidal pulse width modulation (PWM) algorithm. Much of the discussion is, however, relevant to drives which employ alternative control methods. The text falls naturally into a number of parts. First of all, the reasons for the current upsurge of interest in inverter drives are clarified. Past and present methods for producing a static controllable supply are also reviewed. The remaining chapters present the results of this research, and the topics covered fall Into one of two broad categories: 1. Analysis and Implementation of Static Induction Machine Drives or 2. Drive System Performance.