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Balanced Levitation Control of PEMS High Speed Maglev Train Considering System Model Non-Symmetry

PEMS (Permanent magnetic and Electro-Magnetic Suspension) high speed maglev train is proposed on the basis of normal EMS (Electro-Magnetic Suspension) high speed maglev train with permanent magnet added into the electromagnet for the purpose of reducing the levitation current. In high speed maglev train, joint structure which consists of two subsystems is the fundamental levitation unit. The advantage of this joint structure is: the two subsystems can share the burden of the load which makes the levitation current small. However, it is found in practical engineering that due to the system non-symmetry, especially the difference between two levitation gap signals, the burden of load is not equally shared which makes one of the subsystem bears almost the entire burden. Under this circumstance the over load subsystem is vulnerable to external disturbances and the other subsystem is not fully taken use of. To solve this problem, a balanced control method is proposed. Simulation results have verified the effectiveness of the balanced control method.