Stability Analysis of a Closed-Loop Control for a Pulse Width Modulated DC Motor Drive

Authors: FATMA GÜRBÜZ, EYÜP AKPINAR

Abstract: In this paper, the effect of the variation of amplitude and the chopping period of a PWM signal on the stability of a closed-loop control for a DC motor drive is investigated. First, the entire system is formulated as a Linear Quadratic (LQ) tracker with output feedback [1]. Then, stability analysis for the varying amplitude and the varying chopping period is carried out by the methods of root locus and the Jury test. Finally, stability limits obtained from a root locus and Jury test are checked by the simulation of the system in MATLAB.

Keywords: pulse width modulation (PWM), DC drive, stability analysis.

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