Calculating Electromagnetic Force Created by Static Suspension Device Used in Permanent Magnet Electrodynamic Suspension Vehicle

摘要

In response to the shortcomings of existing devices, a novel electrodynamic suspension (EDS) device-based on a semicircular track and cylindrical permanent magnet (PM) Halbach array-is presented in this paper. It enables a vehicle to statically levitate above a semicircular track. In order to calculate the electromagnetic force created by this novel device, we first create a 2-D equivalent linear model of the cylindrical PM Halbach array, build differential equations (based on the linear model) for the magnetic vector potentials, and produce the expression of the electromagnetic force per unit length by solving the equation system. Next, by integrating the electromagnetic force per unit length with the arc direction of the inner semicircular track, the vertical electromagnetic force created by the novel device can be determined. Analytic expression results, and those of a finite element analysis (FEA) model built by Maxwell are compared, and show the average relative error to be 3.02%. The novel device is rational, and the analytic expression is accurate.