Structure Design And Characteristics Analysis Of Rare Earth-iron Magnetostrictive Transducer

Rare-earth magnetostrictive materials, also named giant magnetostrictive materials, has a promising prospect in many fields, because of its large magnetostrictive strain, high energy density, fast response and so on. The transducer using giant magnetostrictive materials is a energy transducer, it can transform the materials′ electromagnetic energy into mechanical energy and output it. It has many advantages, such as structure compact, high energy density, high output power and good reliability. It has been widely used in many fields such as national defense and military, electronic machinery and precision machining.Rare-earth giant magnetostrictive transducer has many advantages, but at the same time, it also has many problems in structure and craftsmanship. So searching for a transducer with new structure, improving its material properties and reducing the loss is the fundamental purpose.A double-rod magnetostrictive transducer was designed. Analyzed rare-earth materials′ working characteristics and described the giant magnetostrictive transducer′ working principle, then work out the magnetic mechanical coupling coefficient of transducer. The designing of double-rod magnetostrictive transducer includes the rare-rod′ dimension, working parameter, magnetic circuit and precompression.Simulated and analyzed the giant magnetostrictive transducer. Selected four typical transducers according to the difference in bias magnetic field, contrasted and summarized their advantages and disadvantages. Simulated and analyzed the double-rod transducer in 2-D condition. The results show that the rare-rod′ magnetic field is more homogeneous than single-rod′s after adding magnetizer. The results proved double-rod transducer′ superiority. Simulated the transducer in 3-D condition and studied the magnetizer ′ influence in different thickness on the magnetic field, and eddying effect′ influence in different frequency on rare magnetostrictiverod′ magnetic field.Analyzed the magnetostrictive transducer′ output characteristics and test it through experiments. Built the static model of the double-rod transducer and figured out the output displacement and output power. Established the dynamic lumped parameter model of the magnetostrictive transducer and figured out the transfer function that do not considering eddying effect and considering eddying effect. Set up the experimental platform and tested the magnetostrictive transducer′ static and dynamic output characteristics.