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SMO Based Position Sensorless BLDC Motor Drive Employing Canonical Switching Cell Converter For Light Electric Vehicle

In this paper, a sliding mode observer (SMO) based rotor position sensorless brushless DC (BLDC) motor drive for light electric vehicle (LEV) is designed employing canonical switching cell (CSC) converter, which optimizes the MPPT performance and soft starting of the motor is assured during sensorless start-up. The CSC converter provides ripple free current in the output to the VSI and minimizes the losses. For sensorless commutation of the BLDC motor drive, SMO technique is used, which estimates rotor angular position and speed. This sliding mode technique reduces switching spikes due to the trapezoidal commutation of the BLDC motor and provides smooth transition between sensored and sensorless mode as required. To ensure green mobility, a pulse-width modulated regenerative braking algorithm is also integrated using the same VSI, which avoids any additional converter. This system performance is simulated and analyzed in the MATLAB environment.