Date of Award

Summer 1988

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Electrical Engineering

First Advisor

Brown, Ronald H.

Second Advisor

Kerkman, Russ

Abstract

A tachometerless PWM (pulse width modulated) induction motor drive that incorporates a PI (proportional plus integral) current regulator as an inner control loop and a PI voltage controller as an outer control loop is analyzed. Two different PI voltage controllers are investigated as part of this induction motor drive, one of them is defined in the synchronous reference frame and the other is defined in the stationary reference frame. The steady state characteristics of these two motor drives are investigated and the advantages and disadvantages of each are discussed. The stability of the voltage controlled current regulated PWM (VCCRPWM) induction motor drive is investigated with respect to load variations, PI voltage controller gains, and induction motor parameter variations. Previous research has suggested that the stationary PI voltage controller has desireable characteristics at lower operating frequencies and that the synchronous PI voltage controller has desireable characteristics at higher operating frequencies [2]. Therefore, a frequency at which changeover from one voltage controller to the other voltage controller is determined.

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