| Magnetic suspension has been used widely because of its many merits such as no mechanical contact, no wear, no need of lubrication and long service life, etc. Electromagnetic suspension (EMS), electrodynamics suspension (EDS) and PM suspension are the main maglev systems. The levitation body is suspended stably for EMS using electromagnetic attraction, with higher power loss. The EDS is a self-stabilizing model, but the cryogenic environment and mass permanent magnets on the guideway are needed. PM suspension produces little restoring force, and high cost and complex layout.In this paper, a novel Detent-force-based Magnetic Suspension System (DMSS) working with the magnetic-detent effect in the vertical direction and torsion is presented. The proposed DMSS has the advantages of no PM in the Guide-way, no current exciting for passive suspension, and low cost, which is applied widely in the magnetic suspension platforms, maglev vehicles, damping devices and so on. The operating principle of DMSS is analyzed, based on magnetic concentration principles, three structures of DMSS are built, and the magnet fields and suspension capabilities are compared using the FEA method. The way to improve the suspension performance is researched as well. Then, the passive suspension characteristics including suspension force and restoring moment are studied deeply, and the influences of some factors on the capability of suspension system are obtained separately, such as different materials of frame and iron-core bracket, PM sizes, air-gap length, and iron-core sizes and so on, the optimum parameters are given using OptiNet. In addition, differential-control strategy of double electromagnets is applied to implement the complete stability of lateral air-gap, and the simulation model based on fuzzy PID control methods is established using Matlab/Simulink tools. Finally, the differential-control system of double electromagnets based on TMS320F2812 DSP chip is designed, including the hardware and software.
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