a Simple Speed Control Technique and Pulsating Torque Elimination Method in a Brushless Dc Motor


1 Electerical and Computer Engineering, Isfahan University of Technology

2 , University of Tabriz

3 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 2) and a new model is introduced in order to eliminate the undesirable effects of the inverter harmonics.