M. Moallem - Electerical and Computer Engineering, Isfahan University of Technology
M. A. Azami - , University of Tabriz
Jawad. Faiz - Electrical and Computer Engineering, University of Tehran

This paper presents a theoretical derivation and computer simulation of an optimal speed controller for a brushless dc motor using feedback from a linear model running in parallel with the inverter-fed model. The intent of the feedback from the linear model is to eliminate torque ripples from the inverter drive. A nonlinear model of such a motor, transformed into a linear model by a local dipheomorphism (defined in section ۲) and a new model is introduced in order to eliminate the undesirable effects of the inverter harmonics.

speed control, Pulsating Torque, Brushless DC Motor