A Novel Analytic Method to Calculate the Equivalent Stray Capacitance of the Low-Speed Maglev Train’s Suspension Electromagnet

Da Liang, Kunlun Zhang, Qilong Jiang and Ying Wang
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Da Liang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Kunlun Zhang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Qilong Jiang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Ying Wang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China

Energies, 2020, vol. 13, issue 20, 1-21

Abstract: The suspension electromagnet (SEM) is one of the most critical components of the low-speed maglev train to achieve the stable suspension and non-contact operation with the track. Therefore, it is valuable for optimizing the maglev system to study the characteristics of the SEM. This paper proposes a novel analytic method to calculate the equivalent stray capacitance of the SEM efficiently. It considers the capacitances inside the winding (turn to turn and layer to layer) and between the winding and core. Firstly, utilizing the compensation analytic method (CAM) calculates the static capacitances to reduce the calculation error, and the results of the CAM have significant improvement comparing with that of the traditional analytic method (TAM). Secondly, the analytical formula of the core floating potential is derived based on the partial capacitance theory, which has a 2.1% relative error to the finite element method (FEM). Finally, the experiment results of the SEM of a test rig prove the accuracy and efficiency of the proposed method.

Keywords: maglev train; suspension electromagnet (SEM); floating potential; finite element method (FEM); stray capacitance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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