Modeling of wireless power system with giant magnetostrictive material load under multi-field coupling

Abstract

Giant magnetostrictive material (GMM) is a new material which owes several characteristics such as giant magnetostriction and fast dynamic response. It can be driven by the electromagnetic field, and can be used into wireless power transfer (WPT) system in order to convert the electrical energy to the mechanical energy in real time. Several issues on electrical-magnetic-mechanical multi-field coupling can be found in magnetically coupled resonant (MCR) WPT system with GMM load, which increases the complexity and difficulty of system modeling, design and control. In this paper, the MCR WPT system with GMM load is analyzed, and the equivalent circuit of MCR WPT system is established to compare with that with the resistive load. The impedance characteristic of GMM coil as the receiving load of MCR WPT system is analyzed by multi-field theory, which is proved to present inductive composed by the electrical part and the mechanical part. Based on impendence model of GMM, the receiving terminal of MCR WPT system is simulated and experimented. It can be found that the experimental results are well consistent with the theoretical analysis. Meanwhile, based on the equivalent circuit of MCR WPT system, researches on relationships between transmission power, transmission distance and operating frequency are carried out. The research results show the correctness and effectiveness of the proposed modeling method.