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Vol. 138, No. 3, March 2012, pp. 80-87




Design of Cursor Magnets on the Wiedemann Effect in Magnetostrictive Linear Position Sensors


Yong-Jie ZHANG, Chun-Feng L. V., Jin-Feng YANG, Wei-Wen LIU, Hui ZHAO

School of Electronic, Information and Electrical Engineering,

Shanghai Jiao Tong University, Shanghai 200240, China

Tel.: +86 21 34205931, fax: +86 21 34205931

E-mail: huizhao@sjtu.edu.cn



Received: 21 November 2011   /Accepted: 20 March 2012   /Published: 31 March 2012

Digital Sensors and Sensor Sysstems


Abstract: The measurement principle of magnetostrictive linear position sensors (MLPS) is based on the Wiedemann and Villari effects. An MLPS is widely used in performing high-speed, non-contact, absolute, and multiple measurements in injection molding machines, woodworking equipment, machine tools, and other machinery used in harsh industrial environments. As the moving element of the sensor, therefore, the cursor magnet is essential in designing an MLPS. Magnet properties such as material, shape, and size, determine the Wiedemann effect and the accuracy of the sensor. In this paper, we discuss the influence of the cursor magnet on the Wiedemann effect in an MLPS from a theoretical and practical perspective, and analyze different types of cursor magnets. We propose that tegular and double rectangular magnets more considerably improve the accuracy and electromagnetic interference suppression than does a single magnet design.


Keywords: Magnetostrictive devices, Position measurement, Magnet design optimization, Wiedemann effect



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