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

Sensors

Song Xue¹  Zhiqiang Long²  Ning He² 

[1] College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha, Hunan 410073, China;

关键词: maglev train;    high precision position sensor;    tracking differentiator;    signal processing;    time delay compensation;   

DOI  :  10.3390/s120505225

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.