Performance Analysis of Brushless DC Motor

An increasing inclination towards electric vehicle (EV) can reduce greenhouse gas emission and carbon footprint. The motor in an electrical vehicle is a crucial component which can affect the efficiency, power and performance of the EV. Brushless DC Motor is widely used in electric vehicles because of higher efficiency and higher speed. Rotor winding can be replaced by PM to eliminate the copper losses, which increases the efficiency of motor. Whereas the adverse effect of PM i.e. cogging torque and PM demagnetization, can be analyzed and optimized. Hence, performance analysis is important at design phase to meet the required application criteria. This paper deals with Various techniques to reduce the cogging torque, an effect of demagnetization on motor performance, noise and vibration forecast due to electromagnetic forces. To get more insight, dominant mode shapes and operational deflection shapes are analyzed by modal and Harmonic response analysis.