Abstract
Many electro-mechanical motional systems include parts that can move relative to the others. EMS-Maglev system is one of the examples, which combines the devices for propulsion, levitation and on-board electric power transfer in a single electromagnetic structure. The analysis of its mechanical dynamic characteristics is very important for the design of the configuration and the control system. Because of the complexity of the time-varying magnetic configuration, analytical method can hardly obtain the dynamic performance. Therefore, analysis of the electromagnetic field is necessary. Moreover, with ordinarily transient finite element method, it is also difficult to consider the external power supply of linear synchronous motors and the working status of linear generator. In this paper, a modified transient finite element algorithm for the performance analysis of magnetically levitated vehicles of electromagnetic type is presented. The algorithm incorporates external power system and vehicles movement equations into FE model of transient magnetic field computation directly. Sliding interface between stationary and moving region is used during the transient analysis. The periodic boundaries are implemented in an easy way to reduce the computation scale. Unfortunately, this directly coupled FE analysis is very time-consuming. To overcome this problem, a fast solving technique for the mechanical dynamic characteristic of electromechanical motional systems is also proposed in this paper. Based on a sequence of finite element analysis, and a set of equivalent electrical circuit parameters extracted, the method incorporates electrical equation and vehicles movement equation into state equations. It is proved that this method can be used for both electromotional static and dynamic cases. Through test of a transformer and an EMS-MAGLEV system, it reveals that the method gives reasonable results at very low computational costs comparing with transient finite element analysis.
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