నైరూప్య

Field Oriented Control for Space Vector Modulation based Brushless DC Motor drive

M.V.Ramesh, J.Amarnath, S.Kamakshaiah, M.Balakrishna

The space vector modulation (SVPWM) of Brushless DC motor (BLDC) is different from that of permanent magnet synchronous motor for its turn-off phase and trapezoidal back electromotive force. To overcome these problems, a SVPWM method is presented in this paper. The application of SVPWM to Brushless AC drives has been investigated extensively. This paper describes its application to BLDC drives and highlights the essential differences in its implementation, as regards torque estimation and the representation of the inverter voltage space vectors. In order to control the torque effectively and directly, the torque is calculated according to the back electromotive force and three phase current. According to the torque error between the given torque and actual torque, the best voltage vector is selected and the dynamic performance of BLDC motor direct torque control system is guaranteed. MATLAB/Simulink is used analyse the simulated results and is shown that SVPWM results in a faster dynamic response.