Modeling methodology for the transformer-rectifier flux pump considering electromagnetic and thermal coupling

Abstract

High-temperature superconducting (HTS) magnets are promising in the application of high-intensity magnetic field. HTS flux pumps are devices that can charge closed HTS magnets without direct electrical contact. Simulation is an effective way to clarify the physical mechanism and provide further insight into the design of the device. In this work, we propose an accurate and efficient modeling methodology to simulate the transformer-rectifier HTS flux pump, which has considered electromagnetic and thermal coupling. The validity of the model has been verified by experimental results and theoretical calculations. The working characteristics of the HTS flux pump are investigated based on the proposed model, including DC bias component in the charging loop, the voltage recovery delay of the dynamic bridge and the temperature distribution in the dynamic bridge. The simulation results clearly depict working details of the device, in terms of electricity, magnetism and heat. The proposed model can serve as a powerful tool to design the HTS flux pump in practical applications.

Numerical study on the electromagnetic characteristics of multi-layer CORC cables

“…The 3D numerical model is constructed and solved based on H formulation [39,40], where the dependent variable is the magnetic field intensity H. According to Faraday 's law and Ampere 's law, the Governing equation is as follows,…”

A superconducting switch using induced current in the closed loop circuit

“…AC field-controlled superconducting switches are based on the dynamic resistance [18], triggered by applying an alternating magnetic field on the HTS tapes carrying a current [19], which has a fast response and recovery [20][21][22][23][24][25]. On the basis of the dynamic resistance, HTS flux pumps have been developed to energize superconducting magnets wirelessly [26][27][28], such as the dynamo-type flux pump [29][30][31][32][33][34][35][36], the linear flux pump [37][38][39][40][41][42][43], the circular type flux pump [44] and the transformerrectifier flux pump [45][46][47][48][49][50][51][52]. Besides, a voltage in the superconductor can be generated by E-J power-law loss.…”