A Study on a Displacement Measurement Method of Magnetic Levitation System Applying the Inductance Characteristic

인덕턴스 특성을 이용한 자기부상계의 변위 측정의 한 방법에 관한 연구

In this paper, we proposed a method to measure the gap between the magnetic pole and the levitated object applying the inductance characteristic which vary according to gap. We made a driving circuit which supply the control input PWM(Pulse Width Modulation) signal and the carrier PWM signal to estimate the gap. Because the inductance is a function of gap, and the current of the carrier signal is a function of the inductance. We investigated the validity of the proposed method through the experimental results.