Abstract
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.
Highlights
High-speed maglev train is driven by linear synchronous motor and operates without contact with track by electromagnetic force suspension [1,2]
The existing speed and position measurement for maglev train include velocity measurement and absolute positioning based on radar [6,7], velocity measurement and relative positioning based on cross induction loop [8,9,10], absolute positioning based on query transponder, absolute positioning based on pulse width coding, absolute positioning based on electromagnetic induction, velocity measurement, and absolute positioning based on inductive wireless communication [11,12,13,14]
In view of the shortcomings of INK, this paper proposes an absolute positioning sensor based on eddy current reflection
Summary
High-speed maglev train is driven by linear synchronous motor and operates without contact with track by electromagnetic force suspension [1,2]. As the absolute positioning sensor currently used in high-speed maglev penetrate the shielding layer and be received by receiver coil. As the absolute positioning sensor currently used insensor high-speed maglev train, by INK In thewaves narrow seam of so theasmarker plate, the incomplete copper coating leads to more electromagnetic at the seam, to identify the seam and read the position code of the marker electromagnetic wave transmission. That the sensor has the advantages of simplified structure, small size, and light weight It reduces the risk of collision between the sensor and the marker plate. U-shaped structure, coil positioning mode and sequential code-reading mode lead to a large. U-shaped structure, coil positioning mode and sequential code-reading mode lead to a large number of coils, correspondingly large volume, and mass. The structure of the sensor can be simplified, and the volume and mass can be correspondingly reduced
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