Thrust tests of a linear synchronous motor(LSM)with its secondary made of coated superconducting coils were conducted via the built prototype over the traditional copper windings.A numerical model of the superconducti...Thrust tests of a linear synchronous motor(LSM)with its secondary made of coated superconducting coils were conducted via the built prototype over the traditional copper windings.A numerical model of the superconducting LSM was made and the measured data of experiment validate its reliability.The nonlinear resistivity of coated superconductor was electromagnetically modeled by resorting to the power law in conjunction with the constitutive relationship of conductor.Based on the numerical model,we carried out a set of transient studies to make a forecast about the superiority of the proposed high temperature superconducting(HTS)LSM,such as magnetic field distribution and the time evolution of thrust together with the speed in different loads and frequencies.The achieved results clearly confirm that the proposed HTS LSM has the advantages to work as a candidate for developing the high-thrust LSM with a large air gap.展开更多
Self‐regulating high‐temperature superconducting(HTS)flux pumps enable direct current injection into a closed‐loop superconducting coil without any electrical contact.In this work,the process of charging a coil by ...Self‐regulating high‐temperature superconducting(HTS)flux pumps enable direct current injection into a closed‐loop superconducting coil without any electrical contact.In this work,the process of charging a coil by a self‐regulating HTS flux pump is examined in detail by numerical modeling.The proposed model combines an H‐formulation finite element method(FEM)model with an electrical circuit,enabling a comprehensive evaluation of the overall performance of self‐regulating HTS flux pumps while accurately capturing local effects.The results indicate that the proposed model can capture all the critical features of a self‐regulating HTS flux pump,including superconducting properties and the impact of the secondary resistance.When the numerical results are compared to the experimental data,the presented model is found to be acceptable both qualitatively and quantitatively.Based on this model,we have demonstrated how the addition of a milliohm range,normal‐conducting secondary resistance in series with the charging loop can improve the charging process.In addition,its impact on the charging performance is revealed,including the maximum achievable current,charging speed,and the generated losses.The modeling approach employed in this study can be generalized to the optimization and design of various types of flux pumps,potentially expediting their practical application.展开更多
基金This work was supported in part by the National Natural Science Foundation of China under Grants 51722706,in part by the Sichuan Youth Science&Technology Foundation under Grant 2016JQ0003,in part by the State Key Laboratory of Traction Power under Grant 2015TPL_T04.
文摘Thrust tests of a linear synchronous motor(LSM)with its secondary made of coated superconducting coils were conducted via the built prototype over the traditional copper windings.A numerical model of the superconducting LSM was made and the measured data of experiment validate its reliability.The nonlinear resistivity of coated superconductor was electromagnetically modeled by resorting to the power law in conjunction with the constitutive relationship of conductor.Based on the numerical model,we carried out a set of transient studies to make a forecast about the superiority of the proposed high temperature superconducting(HTS)LSM,such as magnetic field distribution and the time evolution of thrust together with the speed in different loads and frequencies.The achieved results clearly confirm that the proposed HTS LSM has the advantages to work as a candidate for developing the high-thrust LSM with a large air gap.
文摘Self‐regulating high‐temperature superconducting(HTS)flux pumps enable direct current injection into a closed‐loop superconducting coil without any electrical contact.In this work,the process of charging a coil by a self‐regulating HTS flux pump is examined in detail by numerical modeling.The proposed model combines an H‐formulation finite element method(FEM)model with an electrical circuit,enabling a comprehensive evaluation of the overall performance of self‐regulating HTS flux pumps while accurately capturing local effects.The results indicate that the proposed model can capture all the critical features of a self‐regulating HTS flux pump,including superconducting properties and the impact of the secondary resistance.When the numerical results are compared to the experimental data,the presented model is found to be acceptable both qualitatively and quantitatively.Based on this model,we have demonstrated how the addition of a milliohm range,normal‐conducting secondary resistance in series with the charging loop can improve the charging process.In addition,its impact on the charging performance is revealed,including the maximum achievable current,charging speed,and the generated losses.The modeling approach employed in this study can be generalized to the optimization and design of various types of flux pumps,potentially expediting their practical application.
