21 Active Guideway MAGLEVs
21.1 Introduction
By MAGLEVs we mean here magnetically levitated vehicles:
For high-speed intercity movers
For urban/suburban people movers
For short-haul industrial platforms
Magnetic levitation means controlled suspension and guidance by means of electromagnetic (attraction) or electrodynamic (repulsion) forces. Magnetic levitation may be performed by dedicated dc fed controlled electromagnets—with or without PM assistance—in attraction force MAGLEVs (Chapter 19) or in dc superconducting magnets (or PMs) with air-core active damping coils (Chapter 20). The airgap between the vehicle (platform) and the active guideway has to be dynamically controlled, around rated airgap gm, by ± 25%; gm = 8–10 mm for attraction ...
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