A GSA BASED INPUT CURRENT HARMONIC OPTIMIZATION FOR EFFICIENCY IMPROVEMENT OF BLDC MOTOR DRIVE SYSTEM SUITABLE FOR ELECTRICAL VEHICULAR APPLICATION
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Brushless DC motors are extensively used for electric vehicular applications owing to their excellent torque versus speed characteristics, good efficiency and high power density. This paper describes efficiency improvement of a position sensorless brushless DC motor with improved pulse width modulation (PWM) scheme for the inverter drive compared to existing ones. The inverter switching is based on Selective Harmonic Elimination (SHE). Gravitational search based algorithm (GSA) is used to calculate the optimized switching angles for the purpose. The proposed method reduces total harmonic distortion (THD) from the input current and armature flux thereby reducing the core losses. Also the power requirement with the proposed switching technique is much lesser than the existing switching schemes. The benefit of the proposed efficiency improvement can be of great importance in Electric Vehicular (EV) applications. The effectiveness of the proposed scheme is demonstrated through simulation and experimental results.