Based on the stiffness problem of the hybrid levitation system,the whole hybrid levitation control system was simulated adopting the expert PID controller which tune control parameters on-line automatically,and the expert PID controller with PID controller was analyzed and compared.

To lower the abundant power loss of the electromagnetic suspension system(EMS),which does not take part in the propulsion of the vehicle,permanent magnets are added into the levitation system to construct hybrid levitation system,where permanent magnets can support a part of load and electromagnetic system can regulate rapidly to realize steady suspension.

After the permanent magnet adding to the suspend poles of the hybrid levitation system, facing the increased instability factors, then the control system with faster respond speed and higher stiffness was required.

In this paper,according to the characteristics of the HTS and the factors of the hybrid suspension system,some simulations of a single-magnet model are discussed through ANSYS,the critical current of HTS in the system calculated,the distribution of magnetic field and other magnetic characteristic are analysed.

In this paper the mathematical model of this hybrid suspension system is induced , its characteristics are analyzed, and a controller is designed to ensure its fixed suspension gap.

In the system of hybrid suspension with electromagnets and permanent magnets,a method of producing two complementary PWM wave with dead-time using CPLD is proposed.

Application of electric eddy current sensors in hybrid maglev systems