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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2008, Vol. 9 Issue (1): 99-103    DOI: 10.1631/jzus.A071402
Civil and Mechanical Engineering     
Theory and experiment of observer based magnetostrictive self-sensing actuator
Zhi-feng TANG, Fu-zai LV, Zhan-qin XIANG
Modern Manufacture Engineering Institute, Zhejiang University, Hangzhou 310027, China
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Abstract  Giant magnetostrictive actuators (GMAs) often work in a close-loop feedback system. This system needs independent sensors which may be difficult to be fixed, besides, excessive sensors may cause more unpredicted problems in a large system. This paper aims to develop a self-sensing GMA. An observer based on piezomagnetic equations is constructed to estimate the stress and strain of the magnetostrictive material. The observer based self-sensing approach depends on the facts that the magnetic field is controllable and that the magnetic induction is measurable. Aiming at the nonlinear hysteresis in magnetization, a hysteresis compensation observer based on Preisach model is developed. Experiment verified the availability of the observer approach, and the hysteresis compensation observer has higher tracking precision than linear observer for dynamic force sensing.

Key words： Magnetostrictive      Self-sensing actuator      Hysteresis      Giant magnetostrictive actuators (GMAs)     
Received: 10 June 2007      Published: 10 November 2007
CLC:  TH113  
  TH161  
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Zhi-feng TANG
Fu-zai LV
Zhan-qin XIANG
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Zhi-feng TANG, Fu-zai LV, Zhan-qin XIANG. Theory and experiment of observer based magnetostrictive self-sensing actuator. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(1): 99-103.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A071402     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2008/V9/I1/99

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