Fuzzy Set Theory Based Speed and Position Controls for Magnetic Levitation Systems

Abstract

Magnetically levitated vehicle, using the electro-dynamic suspension and the linear motor, draw public attention as a promising high speed transport system in the forthcoming generation.
The operation of these vehicles should be automatic from start to stop. Accurate and comfortable positioning is indispensable to get a fine adjustment between the vehicle and platform doors. However, it is very difficult to regulate the speed and position of the vehicle, especially with large inertia, at the same time.
This paper describes the fuzzy set theory based speed and position controls. The fuzzy logic uses the velocity and position errors as input signals and issues an acceleration reference. Positioning accuracie is kept within 3_??_4cm by adopting the proposed system.