EV용 권선계자형 동기기와 매입형 영구자석 동기기의 주행 사이클에 따른 차량 시스템 효율 분석

As environmental regulations have been increased around the world, trends in auto markets are becoming greener. Electric vehicles, powered by electric motors, is being developed on behalf of an internal combustion engine. Interior permanent magnet synchronous motor using rare-earth materials are mainly used for electric car, which can satisfy high efficiency and power. Rare-earth materials are essential for the high performance of a permanent magnet, but they are difficult to predict prices and unstable in supply and demand. Therefore, researchers have been developing rare-earth free motors or motors that reduces the use of rare-earth materials. As a representative example, a wound field synchronous motor, which is rare-earth free, has been studied. This paper deals with the efficiency analysis of vehicle system according to the driving cycle of interior permanent magnet synchronous motor and wound field synchronous motor. First, the two target motors have the same stator diameter, number of poles/slots, and designed to produce the same output. Next, the efficiency maps of the two motors were subjected to characteristic analysis to derive the results. Finally, the motor efficiency map will be analyzed through the Advisor by applying the efficiency map the motor to the driving cycle situation.