Lift, drag, and guidance forces on alternating polarity magnets, using loop guideways

摘要

Exact solutions of track current, lift force, and drag force, together with their velocity dependence, have been computed for a vehicle carrying a finite number of fixed current alternating polarity superconducting magnets, suspended at various heights over structured track guideways of the single‐ and double‐loop (’’null’’) types. Results for the double‐loop case are compared with those of a previously reported approximate analysis. The analytical method is then applied to a study of a low‐drag guidance loop guideway which is integrable with lift loop guideways utilizing a common set of vehicle magnets. Solutions are obtained for guidance track restoring forces, lateral destabilization forces, and lift force degradation as functions of lateral displacement from symmetry. The dependence of lift, drag, and lift‐to‐drag on track loop parameters is studied and the linear dependence of lift‐to‐drag on loop time constant confirmed. The contribution to the forces