Abstract:The giant magnetostrictive actuator (GMA) has the characteristics of simple drive structure, fast response and large output force, and is widely used in the field of high performance electromechanical and electrohydraulic conversion. In this paper, the factors affecting the displacement output of GMA are analyzed. Firstly, the principle and structure of GMA are introduced, and then the electromagnetic field simulation of GMA is carried out to compare the effects of different coil lengths on the internal magnetic field intensity distribution in the GMA. Finally, an experimental platform was set up to analyze the effects of different skeleton materials, different processing methods of the materials and different prestress on the output performance of GMA. This paper provides a reference criterion for designing high performance GMA, and summarizes the advantages and disadvantages of GMA output performance under different conditions, so as to provide a reliable scheme for improving GMA performance and optimizing its structure.