Abstract
In the eddy current braking system of high-speed maglev, the peak braking force and the critical speed are key factors determining the performance of eddy current braking force. In this paper, the analytical formula of eddy current braking force is derived by a subdomain method considering the skin effect of the induction plate, and, subsequently, the characteristics of peak braking force and critical speed are analyzed. The analytical model is set up in a 2D Cartesian coordinate system. The Poisson equations in each subdomain are listed by treating the vector magnetic potential as a variable. By combining the boundary conditions between two adjacent subdomains, the expressions of eddy current density and magnetic density in the induction plate are obtained. Then, the analytical formula of the eddy current braking force is obtained by the Ampere force formula. The results of finite-element analysis confirm the validity of the analytical calculation. The methods of improving the performance of eddy current braking force under high speed are proposed by parametric analysis of peak braking force and critical speed, which provides guidance for the design of the eddy current braking system in high-speed maglev.
Highlights
IntroductionEddy current braking is an emergency braking system for high-speed maglev, which has the advantages of good controllability, no pollution, and no contact between the train body and rail
Eddy current braking is an emergency braking system for high-speed maglev, which has the advantages of good controllability, no pollution, and no contact between the train body and rail.it is very important to analyze the characteristics of eddy current braking
In Reference [6], the expressions of peak braking force and critical speed are given, which are based on the analysis of permanent-magnet eddy current braking, but the skin effect of the induction plate is not considered in these expressions
Summary
Eddy current braking is an emergency braking system for high-speed maglev, which has the advantages of good controllability, no pollution, and no contact between the train body and rail. In Reference [6], the expressions of peak braking force and critical speed are given, which are based on the analysis of permanent-magnet eddy current braking, but the skin effect of the induction plate is not considered in these expressions. The performance of eddy current braking force, including peak braking force and critical speed, is studied theoretically. The methods of improving the peak braking force and the critical speed are proposed, which can provide guidance for improving the performance of eddy current braking force under high speed. The analytical formula can clearly reflect the relationship between the braking force and the parameters, and can quickly calculate the value of the peak braking force and the critical speed, which avoids the shortcomings of FEA, such as time-consuming and unable to reflect the mechanism of production of the braking force. This paper only includes FEA-based results rather than experimental verification
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