On-Line Optimal Efficiency Control for Permanent Magnet Synchronous Motors Driving electric Vehicles

전기자동차 구동용 영구자석형 동기전동기의 온라인 최적 효율제어

This paper suggests the algorithm for on-line efficiency control of permancent magnet synchronous motors driving the electric vehicles. The existance of unigue d-axis current is verified, which generates the maximum efficiency at operating points of motor. Using the Fibonacci search method, d-axis current converges to the minimization of inverter input power, and to prevent the variation of motor speed in process of the efficiency control, the voltage decoupled control strategy is introduced. Through the experiments, the effects of an efficiency control algorithm are verified.