超高速磁浮涡流装置制动力的解析分析

Analytical Calculation of Braking Force of Super High Speed Maglev Eddy Current Device

涡流制动系统对于磁悬浮列车安全运行至关重要。该文采用子域法解析得到速度(包括超高速)、励磁电流、气隙长度、感应板厚度和电导率等参数与涡流制动力之间的解析式。在二维坐标系下建立解析模型,以磁矢位为求解变量,在解析模型各个子域内列写泊松方程,并结合各子域之间的边界条件求得气隙内的磁通密度表达式,进而得到涡流装置所受涡流制动力的表达式。利用有限元仿真证明了解析计算的正确性,并探究超高速下磁浮列车应用涡流制动系统的可行性。使用解析计算对涡流制动力进行参数分析,得到优化超高速涡流制动系统的方法。相比于仿真分析,解析计算能够反映涡流制动力产生机理并具有节省计算时间的优点。

The eddy-current braking system(ECBS)is vital to the safe operation of a high-speed maglev.This paper used the subdomain method for the analytic calculation of the expression of the eddy-current braking force that is related to parameters,such as speed(or super high speed),exciting current,air-gap length,induction plate thickness and conductivity.An analytical model was established in the 2-D coordinate system.With the magnetic vector potential as a variable,each subdomain of the model could be expressed by Poisson equations.In combination with the expression of air-gap flux density obtained according to the boundary condition between two adjacent subdomains,it is possible to derive the expression of eddy-current braking force.The results of finite-element simulation show that the analytic calculation is correct,and the feasibility of the ECBS to be used in the superhighspeed maglev is explored.The analytic calculation used for the parametric analysis of braking force is a good way of optimizing the superhighspeed ECBS.Compared with the simulation analysis,the analytic calculation can reflect the mechanism of eddy-current braking force and have the advantage of time-saving calculation.