Computation And Experiment Of A High Temperature Superconducting Transverse Flux Maglev Linear Motor

With the implementation of the national 13 th five-year plan for science and technology innovation,and CRRC Corporation Limited announced the launch of a 600km/h high-speed maglev railway project,which proved that studying on the advanced high-speed maglev vehicle has become one of the key areas of modern rail transit technology and equipment.This paper combined the high-temperature superconducting maglev technology with transverse flux theory to present a transverse flux linear motor(TFLM)with the superconductor-aluminum hybrid as the secondary made of aluminum plate and close-ended coated superconductor coils,and E-shaped ferromagnetic yokes wrapped the conductor windings as the primary to generate the transverse flux,levitation,guidance and propulsion could be integrated by the proposed TFLM,which provides a novel alternative to the scientific community of maglev transit.This paper integrated the analytical calculation,finite-element method(FEM)and experiment to explore the electromagnetic characteristics of superconducting TFLM and reveal the multi-physical field response characteristics of hybrid secondary in complex electromagnetic field.The basic theory of electromagnetic field related to this topic was introduced,2-D analytical model of aluminum plate and critical state model of high-temperature superconductor(HTS)were built to analysis the static characteristic of superconducting TFLM,taking the size effect into consideration,we derived the electromagnetic field control equation according to A-formulation,and calculated the net magnetic force.A mathematical model reflected the E-J nonlinear property of HTS materials is presented,and the mathematical expression of power exponent model is obtained.A 3-D FEM model was established,we considered the influence of joint resistance and optimized grid division to ensure the rationality and correctness of model.A laboratory prototype and test rig were built to measure the magnetic force,analytical model and FEM model were validated by experimental results.The relation between the suspension force,guidance force,thrust and field distribution of the superconducting TFLM with the change of electrical parameters and mechanical parameters was investigated by simulation and experiment to explore the potentials of integrating the propulsion with the levitation and guidance.Moreover,we also investigated the transient characteristics and dynamic responses against disturbance and also studied the influence of aluminum plate on the overall performance.This paper presents a novel alternative to the scientific community of maglev transit,which integrates the levitation,guidance and propulsion.It is a new research topic based on proposed new HTS maglev structure that avoid permanent magnetic track.The research on the related technology of superconducting HTS will develop a new and important research direction for the development of new rail transit technology.