The Multi-physics Analysis And Optimization On Shell-type Traction Transformer

Electric locomotive traction mode has mainly two modes,centralized and decentralized traction,the decentralized mode of locomotive traction due to start accelerating,the system balance and reliability than the centralized operation of traction has obvious advantages are widely used in high-speed electric locomotives,shell-type traction transformer is adopted widespread in the decentralized model for the characteristics of small volume,electromagnetic interference than conventional core traction transformer.But this compact structure,small shell-type traction transformer magnetic flux leakage very serious impact,Therefore,to carry out its environmental simulation analysis of electrical,magnetic,thermal,and has important engineering significance.In this paper,the shell-type transformer research work has been carried out simulation analysis and optimization of multi-physical fields as follows:At first,this paper systematically analyzes the basic theory of electromagnetic field analysis and calculation,boundary conditions,and then discusses the basic principle of the scalar potential and the magnetic vector potential in the seemingly stable alternating electromagnetic field;This paper expound the basic principle and implementation steps of the finite element method,because the edge unit method has obvious advantages and better accuracy than the node finite element method in dealing with the interface which has large changes in material properties,this paper analyzes the element shape function of edge element method.Then,put a shell-type traction transformer as the research object,established the traction transformer three-dimensional finite element model by using ANSYS software,and calculated its leakage field eddy current field by using edge element method,combined the calculation principle of eddy current loss,the eddy current loss and the eddy current loss of traction transformer internal metal structure were calculated;On this basis,combined with the magnetic-heat indirect coupling algorithm to calculate the temperature field;the results show that:the shell-type traction transformers will appear locally overheating,Thus proposed improvement scheme of core splint slot and the tank wall shielding plate.At last,based on the Taguchi algorithm implementation steps and Rosenbrock optimization algorithm,this paper proposes a new algorithm combines the Taguchi and Rosenbrock optimization algorithm,and gives the optimization steps and block diagram of the new algorithm,and optimize the design of splint slot and the tank wall with magnetic shielding with the new algorithm;By comparing the calculated results with the initial plan,the results showed that:optimization can significantly improve traction transformer shell-vortex distribution and temperature field distribution,the effect is obvious.