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Open AccessArticle

A High Precision Position Sensor Design and Its Signal Processing Algorithm for a Maglev Train

College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha, Hunan 410073, China
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Sensors 2012, 12(5), 5225-5245; https://doi.org/10.3390/s120505225
Received: 2 February 2012 / Revised: 31 March 2012 / Accepted: 20 April 2012 / Published: 26 April 2012
(This article belongs to the Section Physical Sensors)
High precision positioning technology for a kind of high speed maglev train with an electromagnetic suspension (EMS) system is studied. At first, the basic structure and functions of the position sensor are introduced and some key techniques to enhance the positioning precision are designed. Then, in order to further improve the positioning signal quality and the fault-tolerant ability of the sensor, a new kind of discrete-time tracking differentiator (TD) is proposed based on nonlinear optimal control theory. This new TD has good filtering and differentiating performances and a small calculation load. It is suitable for real-time signal processing. The stability, convergence property and frequency characteristics of the TD are studied and analyzed thoroughly. The delay constant of the TD is figured out and an effective time delay compensation algorithm is proposed. Based on the TD technology, a filtering process is introduced in to improve the positioning signal waveform when the sensor is under bad working conditions, and a two-sensor switching algorithm is designed to eliminate the positioning errors caused by the joint gaps of the long stator. The effectiveness and stability of the sensor and its signal processing algorithms are proved by the experiments on a test train during a long-term test run. View Full-Text
Keywords: maglev train; high precision position sensor; tracking differentiator; signal processing; time delay compensation maglev train; high precision position sensor; tracking differentiator; signal processing; time delay compensation
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MDPI and ACS Style

Xue, S.; Long, Z.; He, N.; Chang, W. A High Precision Position Sensor Design and Its Signal Processing Algorithm for a Maglev Train. Sensors 2012, 12, 5225-5245.

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