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Modeling and Implementation of Sliding Mode Controller for Permanent Magnet Brushless DC Motor Drive

M.V.Ramana Rao, P.V.N.Prasad

The sliding mode control technique for permanent magnet brushless DC motor is used to improve its dynamic performance with high accuracy The proposed novel sliding mode (SM) controller method is used drive at all speed levels. The SM controller is the most attractive and simple in modelling for its insensitivity to parameter variations and external disturbances. The validity of the proposed method is verified through simulation. The PMBLDC motor is inherently electronically controlled and requires rotor position information for proper commutation of current. An equation based model for closed loop operation of PMBLDC motor drive is simulated in MATLAB/Simulink. Simulation results show the proposed SM Controller has the advantage of fast response and less steady-state error when compared to that of the conventional PI controller. In this paper the responses of current, speed and torque using SM controller is compared with that of PI controller.