Design Of Magnetic Circuit Structure And Experiment Study Of Magnetostrictive Transducer Based On Finite Element Method

Rare-earth giant magnetostrictive materials are the new functional materials developed in recent years. They have been used in many fields due to its large magnetostrictive strain, fast response time, high energy density and high magnetic coupling coefficient. Transducer is a core component of power ultrasound, and the utilization of new material is important way to develop of a new transducer. Rare earth giant magnetostrictive material Terfenol-D has excellent performance, and now, many research institutes use this material to magnetostrictive transducer. In this paper, working characteristic of giant magnetostrictive material Terfenol-D and structure design of magnetic circuit of transducer have been analyzed in order to optimize the structure of giant magnetostrictive transducer.First, the paper introduces the magnetostrictive phenomenon mechanism, development history and the recent research results. The magnetostrictive transducers on research and the problems were reviewed at home and abroad. Thus the significance of this paper topic and relevant research content are given.Secondly, the working principle, general design principle and method of the transducer have been described. According to the working characteristics of giant magnetostrictive material, the structure diagram of giant magnetostrictive transducer is determined, combined with several key design issues. and proposed The design methods of magnetostrictive transducer have been discussed, including incentive coil design, bias magnetic coil design, GMM rod design and leakage magnetic field design.Then, Finite element method is introduced, and the giant magnetostrictive transducer is analyzed by using finite element analysis software to optimize the design of magnetic circuit. The efficient flux and wastage of eddy current of transducer have been discussed. The flux distribution of giant magnetostrictive transducer has been analyzed by using finite element analysis software simulation and the optimizing transducer structure has been determined.Finally, the characteristic of giant magnetostrictive transducer is experimentally studied. The experimental data shows that the feasibility of optimization for the giant magnetostrictive transducer. On the basis of experiment result, the coil structure of the transducer is optimized. The further work on the future was proposed based on the result.