V/f 제어를 이용한 초고속 영구자석 전동기의 특성 해석

In general, V/f control has been used in induction motor. But V/f control methods can be used to control also, when permanent magnet synchronous motors(PMSMs) are used for pump and fan applications. The V/f control, which realizes a low cost and simple design, is advantageous in the middle to high speed range. When we control synchronous motors, in order to promote efficiency, we must take a power factor degree, that is changed because of inductor, resistance and frequency. in the motor. Therefore in this paper a comparison power factor degree, when consider power factor degree and out of consideration power factor degree, is proposed for motor drives on stable operation by V/f control.