Abstract
The electromagnetic suspension system, which is a kind of magnetic levitation, can be divided into two groups; separate lift & guidance system and combined lift & guidance system. This paper deals with the latter system, in which lift and guidance forces are generated by a pair of staggered magnets with the inverted U-shaped rail. Although the above arrangement mentioned provides the lift and the guidance simultaneously, a separate control scheme over them is desirable.
In this work, a quasi-decoupled control method is presented, which reduces the coupling between guidance and lift over a substantially wide range of lateral displacement. Simulation showed that the lift control has a small effect on the guidance but the guidance control has a considerable effect on the lift. Therefore a parallel complementary controller on the lift controller is proposed to reduce the sensitivity for parameter variation and force disturbance.
In result, the lift system has robustness to parameter variation and force disturbance, while the guidance system is independently controllable with respect to lift system. Hence enabling to obtain adequate guidance force and to meet the ride quality standard related to the guidance of levitation vehicle.
