Mechanical Analysis And Experiment Of A New Type Of Composite Resin Impregnated Superconducting Magnet

Nowadays,superconducting magnet technology plays an irreplaceable role in medical treatment,transportation,energy and other fields.In the power system,the need for high-power active and reactive power regulation and large-scale energy storage has driven the development of superconducting magnetic energy storage(SMES)technology.Meanwhile the use of high-temperature superconducting materials has significantly improved the performance of SMES system.As the core part of the system,the SMES magnet is a typical representative of the superconducting magnet,which needs to be impregnated by epoxy resin to improve the operation stability in the process of preparation.However,the thermal conductivity of epoxy cured material is low,which leads to the rapid transmission and dissipation of heat,easily resulting in the loss of magnet and even damage.The magnet is impregnated with a new type of high thermal conductivity composite resin,which can enhance the mechanical strength of the magnet,and solve the problem of heat dissipation of the magnet inside to the maximum extent at the same time.But the mechanical properties of epoxy resin have been greatly changed in the process of modification.This thesis analyzes the coupling relationship among the electric,magnetic,thermal and mechanical fields in the preparation and operation process of SMES magnet,and the connection between temperature change and mechanical properties of superconducting tapes.Through this thesis,the criteria of the mechanical stability of superconducting magnets will be determined and it puts forward the content and analysis method of the mechanical analysis of HTS-SMES magnet.Then modeling the magnetic structure associated with practical engineering,analyze the thermal stress in the process of preparation and coupling of thermal stress and electromagnetic force in the process of operation by finite element analysis software,and determine the mechanical stability of the superconducting magnet impregnated with the new type of epoxy resin.After that,the thesis will propose the optimization of superconducting magnet coil manufacturing process based on the results of simulation to make a group of small magnet coils which will be impregnated by the new type of epoxy resin.At last,by comparing and analyzing the current carrying capacity of the coil before and after impregnation,the feasibility of the curing process is verified,which provides a reliable experimental basis for the preparation of large scale magnets.Through the above work,the successful demonstration of the new epoxy resin can meet the practical engineering requirements.And it is proved that the process of impregnation can be applied to the processing of large magnet coils at the same time.