Influence of Speed on Levitation Force of Medium−Low-Speed Maglev Train

WANG Ying; LIU Fanglin; LIU Shijie; LUO Cheng; WU Qian

doi:10.3969/j.issn.0258-2724.20210913

Volume 58 Issue 4

Aug. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(4): 792-798.

WANG Ying, LIU Fanglin, LIU Shijie, LUO Cheng, WU Qian. Influence of Speed on Levitation Force of Medium−Low-Speed Maglev Train[J]. Journal of Southwest Jiaotong University, 2023, 58(4): 792-798. doi: 10.3969/j.issn.0258-2724.20210913

Citation:

WANG Ying, LIU Fanglin, LIU Shijie, LUO Cheng, WU Qian. Influence of Speed on Levitation Force of Medium−Low-Speed Maglev Train[J]. Journal of Southwest Jiaotong University, 2023, 58(4): 792-798. doi: 10.3969/j.issn.0258-2724.20210913

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Influence of Speed on Levitation Force of Medium−Low-Speed Maglev Train

doi: 10.3969/j.issn.0258-2724.20210913

WANG Ying^{1, 2
,},
LIU Fanglin^{1, 2},
LIU Shijie^{1, 2},
LUO Cheng^{1, 2},
WU Qian^{1, 2}

1.
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610097, China
2.
Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle of the Ministry of Education, Southwest Jiaotong University, Chengdu 611756, China

Received Date: 15 Nov 2021
Rev Recd Date: 05 May 2022

Available Online: 01 Apr 2023

Publish Date: 02 Jun 2022

Abstract

Abstract

Electromagnet provides suspension force for medium−low-speed maglev train. When the electromagnet moves relatively to a rail, eddy current is generated on the rail. The external magnetic field generated by the track eddy current offsets part of the original magnetic field generated by the electromagnet, causing the decrease of the suspension force provided by the electromagnet. Firstly, the formation of rail eddy current and its effects on air gap magnetic field are analyzed at different vehicle speeds. The influence of train speeds on the suspension force is further studied. Secondly, the laminated F-rail is used to suppress eddy current effect. Combined with the mechanism of the laminated F-rail lifting suspension force, the influence of rail eddy current on the suspension force is analyzed with the F-rails of different laminated layers. Finally, the electromagnet structure of Changsha Maglev Fast Line is simulated by using finite element software. The results show that the laminated F-rail can reduce the rail eddy current, and the air gap magnetic field gradually approaches the one under static conditions. When the coil at the end of the electromagnet model moves at the speed of 120 km/h, the suspension force is 5.7 kN without the non-laminated F-rail and 7.5 kN with the laminated F-rail of two layers, increasing by 30% compared with the case of the non-laminated F-rail.
- magnetic levitation vehicle,
- electromagnet,
- electromagnetic force,
- eddy current

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References(15)

References

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