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发表时间：2008-01-01

发表刊物：光学精密工程

所属单位：机械工程学院

期号：5

页面范围：870-877

ISSN号：1004-924X

摘要：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.

备注：新增回溯数据