A NEW TECHNIQUE FOR THE DESIGN OF A COMPENSATOR FOR BRUSHLESS DC MOTORS

Abstract

III The thesis work mainly relies upon designing of compensator especially lead compensator which can be incorporated into the system in order to improve the response of dc motor without affecting the other parameters. Compensators are specially designed under some design constraints like settling time, rise time, peak overshoot and steady state error. Improving steady state error is the key parameter which has to be taken under consideration. By suitable choice of BLDC motor constants, transfer functions .The mathematical formulation of transfer function and location of poles and zeros has also been studied. The stability of the system can be analyzed by plotting poles and zeros on the root locus plot. Different compensators are designed by choosing suitable values of poles and zeroes by trial and error method and the corresponding response curves of different compensators are compared. In order to calculate gain margin and phase margin, bode plot has been plotted. MATLAB is used in order to study different parameters and to plot different response curves. Also the compensator is designed by using anew technique (non-trail and error method). The simulation environment provided in the MATLAB SISOTOOLBOX is used to perform experimental analysis. The thesis paves the way for subsequent hardware implementation as an anticipated augmentation to this work.