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《Optics and Precision Engineering》 2008-05
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Vector impedance analysis model for giant magnetostrictive micro-displacement actuator

JIA Zhen-yuan,WANG Xiao-yu,WANG Fu-ji (Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education,Dalian University of Technology,Dalian 116024,China)  
On the basis of linear piezomagnetism equation, electromechanical transformation equation and impedance analysis method,a vector impedance model of Giant Magnetostrictive Micro-displacement Actuator(GMA) system was set up.The model divided the vector impedance of system into two sections,mechanical admittance and electrical impedance.In the section of mechanical admittance,the external load influence was considered and the coefficient of piezomagnetism was defined as a constant complex variable to simulate the displacement hysteresis;in electrical impedance,an eddy current term was added to the solved magnetization of magnetostrictive material to simulated the nonlinear characteristics of the system.The sum of two sections was the system's vector impedance.The comparison between experimental and model data indicates that the errors between measured vector impedance and model data are about 7% in magnitude and 7.7% in phase.The results show that the model can simulate the impedance characteristics of the system under the precision occasion,and can guide the design,control and the performance optimization of the GMA system.
【Fund】: 国家自然科学基金资助项目(No.50775021);; 新世纪优秀人才支持计划资助项目(No.NCET-04-0265)
【CateGory Index】: TH703
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