Project Stratagems for a Nonlinear Vector Controller Fed BLDC Motor

Abstract

Brushless DC (BLDC) motors are becoming an engaging alternative to DC and Induction motors. Various types of control strategies like direct vector control and indirect vector controls are illustrated for variable speed Alternating current drives. When those control strategies are applied to the proposed drive, there are certain drawbacks like instability, sensitive to parameter variations, etc. In this work, in order to get rid of the above difficulties, a design methodology is proposed in the closed loop control of BLDC drive, in which there is an instinctive flexibility to produce the required torque for various possible set of currents. Using this methodology we can attain better control over the drive. A suitable nonlinear and a robust controller makes the drive robust, which in turn makes the system insensitive to the parameter variations and increases the degree of stability. Robust control is a technique, which can precisely deals with uncertainty. These control techniques are used to accomplish robust performance and stability in the existence of bounded modeling errors. This paper gives more information regarding the design features of BLDC motor using MATLAB software.