Modeling for Magnetic Shape Memory Alloy Actuators Using a Modified Generalized Prandtl-Ishlinskii Model

The input and output of magnetic shape memory alloys (MSMA) actuators exhibit hysteresis and nonlinear characteristics due to the unique internal properties of the material. This poses a challenge in effectively controlling the MSMA actuators. In this paper, we design open-loop experiments based on the experimental platform of MSMA. The experimental data shows that the frequency of the input signal affects the output properties of the MSMA actuator. The MGPI model introduces parameters linked to the input signal frequency on top of the Generalized Prandtl-Ishlinskii model to characterize the MSMA hysteresis nonlinearity. The validity of the model is confirmed by the successful fitting of the experimental data, providing valuable insights into the control of the MSMA actuator.