Abstract
High speed transportation vehicles (trains) carrying superconducting magnets can be levitated by repulsion from diamagnetic currents induced in a conducting track. In a paper by Richards and Tinkham submitted to J. Appl. Phys., various approximate methods are presented for calculating the lift and drag forces for such magnetic suspensions. Fourier analysis of periodic train magnet fields is used to study “image force” and “hybrid null flux” systems which involve homogeneous conducting sheet tracks. A lumped circuit analysis is used to discuss the “null flux” principle and related systems with structured tracks. The stability and efficiency of linear induction and linear synchronous motor propulsion systems are studied using related methods.
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