19 Attraction Force (Electromagnetic) Levitation Systems
Attraction levitation systems (ALS) use attraction current–controlled electromagnetic force to control the airgap between fix and mobile mild magnetic cores. Applications for ALS range from magnetic bearings and vibrating tables to magnetically levitated vehicles (MAGLEVs) [1–3].
For MAGLEVs, the primary is placed on board and contains permanent magnet (PM)-less or PM-assisted dc controlled current electromagnets (solenoids) and a solid mild iron fix secondary (track).
On the other hand, for active magnetic bearings and for vibrating tables, the secondary is the mover and is made, in general, from a laminated mild steel core or of a soft magnetic composite (SMC).
In this chapter, we will ...
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