Modeling and Control of Maglev Train Considering Eddy Current Effect

2020 ◽  
Author(s):  
Qing Yang ◽  
Peichang Yu ◽  
Jie Li ◽  
Zhenxiang Chi ◽  
Lianchun Wang
Keyword(s):  
Eddy Current ◽  
Current Effect ◽  
Maglev Train ◽  
Modeling And Control ◽  
Eddy Current Effect ◽  
And Control

scholarly journals Analysis and solution of eddy current induced in rail for medium and low speed maglev transportation system

2018 ◽  
Vol 4 (4) ◽  
pp. 129-137 ◽  
Author(s):  
Ying Yang ◽  
Wenyue Zhang ◽  
Laisheng Tong ◽  
Qibiao Peng ◽  
Huajun Luo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Levitation Force ◽  
Current Effect ◽  
Maglev Train ◽  
Running Speed ◽  
Low Speed ◽  
Eddy Current Effect ◽  
Maglev Transportation System ◽  
The Magnetic Field

Background: For medium and low speed maglev transportation system, the eddy current will be induced in rail, which is made of solid steel, while the train is running. The levitation force of electromagnets will be weakened by the magnetic field generated by eddy current in the rail, especially at the position of the forefront electromagnets. With the increase of train running speed, the eddy current effect will also increase, which will reach 30 % at 100 km/h, and which will directly affect the levitation stability of the train during high-speed running. Put it another way, it will limit the further improvement of the running speed of the medium and low speed maglev train. Aim: In order to solve the above problem, and compensate the levitation force reduced by the eddy current effect. Methods: The FEA method is used to obtain the magnetic field distribution and levitation force changing with the train speed. And taking the middle and low speed maglev trains and rails of Changsha Maglev Express as the research object, we have adopted two solutions, and the prototypes of airsprings and levitation magnets are manufactured and tested in the train. Results: The test result show that the currents of the windings at the front end of the two forefront electromagnets are reduced obviously. Conclusion: In this paper, the medium and low speed maglev train and rail used by Changsha Maglev Express are studied, the eddy current effect is analyzed, and two solutions are proposed. The results show that the solution methods can alleviate the eddy current effects to some extent.

scholarly journals Resonant Diaphragm Liquid Density Sensor

2011 ◽  
Vol 1 ◽  
pp. 121-124
Author(s):  
Yu Xiao Zhang ◽  
Xian Quan Zeng ◽  
Xin Jie Wang
Keyword(s):  
Residual Stress ◽  
Eddy Current ◽  
Processing Technology ◽  
Liquid Density ◽  
Current Effect ◽  
Eddy Current Effect

This paper designs a resonant diaphragm liquid density sensor. From the reality, a resonant diaphragm is designed and manufactured. Processing technology on resonant diaphragm is studied and improved through compensating elastic error, and eliminating residual stress. Incentive coil is designed using the eddy current effect.

Design and indirect adaptive fuzzy H∞ control of a novel retarder coupled with eddy current effect and MR effect

2020 ◽  
pp. 1045389X2096318
Author(s):  
Xiaoqin Xu ◽  
Tianyu Zhu ◽  
Shumei Chen ◽  
Cheng Wang
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
Control Process ◽  
Constant Speed ◽  
Current Effect ◽  
Adaptive Fuzzy ◽  
Eddy Current Effect ◽  
Full Speed ◽  
Braking Process ◽  
Mr Effect

To improve the poor braking performance of the traditional eddy current retarder, a novel retarder is developed by coupling the eddy current effect and the magnetorheological effect, which has large torque at low speed and stable torque at high speed. To meet the constant speed requirement in the braking process, the indirect adaptive fuzzy H∞ control strategy is employed to control the rotor speed of the designed retarder. The results show that the proposed retarder has the characteristics of continuously adjustable large torque in full speed section, sensitive control process and constant speed intelligent control.

scholarly journals Research on Absolute Positioning Sensor Based on Eddy Current Reflection for High-Speed Maglev Train

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5167
Author(s):  
Xiaobo Hong ◽  
Jun Wu ◽  
Yunzhou Zhang ◽  
Yongxiang He
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
The Novel ◽  
Maglev Train ◽  
Compact Structure ◽  
Absolute Positioning ◽  
Eddy Current Effect ◽  
Speed Range ◽  
The Impact ◽  
Detection Coil

A novel absolute positioning sensor for high-speed maglev train based on eddy current effect is studied in this paper. The sensor is designed with photoelectric switch and four groups of unilateral coplanar code-reading detection coil combination. The photoelectric switch realizes the positioning of the marker plate, and the four groups of detection coils read the mileage code of the mileage sign plate to obtain the absolute mileage information of the vehicle, which effectively reduces the quality and volume of the sensor, and reduces the impact of ice and snow. At the same time, the code-reading reliability and speed adaptability index are proposed. The code-reading reliability of the sensor is analyzed and tested under the fluctuation of levitation guidance, and the positioning error under the speed range of 0–600 km/h is calculated and analyzed. The results show that the novel sensor has the advantages of simple and compact structure. It still satisfies the system’s requirements for absolute vehicle mileage information under the conditions of vehicle operating attitude fluctuations and changes in the full operating speed range.

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