Study On The Control Technology Of MCU Self-sensing Actuator

Magnetically Controlled Shape Memory Alloy (MSMA), which is a kind of new functional materials with the function of shape memory. Nowadays, MSMA which takes Ni-Mn-Ga as the principal constituent had been used in sensors and actuators solutions. In the sensor application, the magnetic conductivity of the material was selected as the basic factor about the strain, the stress field solves; In the actuator application, the magnetic field changes were observed through the deformation and the displacement of MSMA material generates. This material compares with the former super-magnetostriction material, the deformation is 50 times, even bigger, which has both the shape memory effect and the super-magnetostriction phenomenon. In the future, the alloy in scientific research has wide application prospects.In this paper, the experiment system of single-coil self-sensing actuator is established based on the experimental testing platform of dual-coil self-sensing actuator. From two aspects of forward and reverse characteristics to study the deformation mechanism of MSMA, according to the measured data, the characteristic curves of the material are drawn using MATLAB. They provide theoretical basis for the next research of MCU single-coil self-sensing actuator.In order to verify the validity and rationality of the built model, the finite element model of MSMA dual-coil self-sensing actuator and single-coil self-sensing actuator are established through the ANSYS software. Edge element method is used to analyze the 3d static magnetic field of dual-coil and single-coil self-sensing actuator under different excitation voltages. The analysis obtained MSMA and silicon steel sheet's distribution of magnetic induction intensity and the magnetic field intensity. According to the simulation data, the paper has drawn the magnetic induction intensity curves, and established the mathematical mode of dual-coil self-sensing actuator, the calculation questions of magnetic field which is from the space about excitation coil are analyzed. For the dual-coil signal separation of self-sensing actuator, time division multiplexing thought through the entire experiment process, it compares to dual-coil self-sensing actuator which uses spatial multiplexing thought to decoupling signal. The output characteristic of self-sensing actuator signal and the obtaination of sensor signal, further demonstrated the practical value and engineering application prospect of MSMA.