CONTROL ALGORITHM TO REJECT THE EFFECT OF IRON SLEEPERS FOR MAGLEV VEHICLE USING LSM WITH PM HALBACH AND IRONLES COIL

Abstract

In the magnetic levitation (maglev) vehicle that utilizes LSM with permanent magnet (PM) Halbach and ironless coil, attractive force can be generated between the PM Halbach on the vehicle and the iron sleepers on the guideway. With a direction opposite to the suspension force, this attractive force correspondingly increases the suspension load and affects the suspension performance. In this work, the effect of iron sleepers on maglev suspension system is investigated, and a control algorithm is proposed to reject this effect. First, by introducing the magnetic field equation of the PM Halbach, the analytical expression of the attraction force between the iron sleepers and the PM Halbach array is obtained. Then the attraction force is added to the suspension control system, and the resultant suspension performance is presented. It is shown that resonance occurs when the vehicle passes through the iron sleepers on the guideway using typical state feedback control strategy. To reject the effect of the sleeps on the suspension system, a nonlinear controller using a feedback linearization technique is developed. Simulation result shows that the proposed nonlinear control algorithm can effectively reject the resonance resulted from the sleepers on the guideway.

http://dx.doi.org/10.5755/j01.mech.17.6.1009