A Study on Closed Loop Control of a Linear Induction Motor Using General Purpose Frequency Inverter

범용 인버터에 의한 선형유도 전동기의 폐루프 제어 방식에 관한 연구

Constant slip frequency operation of linear infliction motor is essential for the stable levitation. Control scheme for the constant slip frequency with general purpose frequency inverter is proposed, Speed sensing scheme with proximitity switch for the speed feedback is also proposed. Optimal slip frequency, at which normal force is equal to 0, is selected by the experiment. This slip frequency is a comand to the controller. It shows good characteristic during acceleration and deceleration.