Coaxial integrated design scheme of macro-micro composite actuator with large-stroke and high-precision

Aiming at the problem that giant magnetostrictive actuator has short stroke and is difficult to be popularized. Combining the advantages of large stroke of voice coil motor with high precision of giant magnetostrictive actuator, a coaxial integrated structure of macro-micro composite actuator with large stroke and high precision is proposed. According to the working principle of composite actuator, the coaxial integrated design scheme of composite actuator is verified by electromagnetic field simulation analysis, and in the process of macro motion in 0-20 mm, the distribution of magnetic force line of macro-motion coil, the effect of macro-motion coil on the distribution of micro-motion magnetic field, and the effect of micro-motion coil on macro-thrust are analyzed. The analysis results show that the distribution of magnetic force line is reasonable and the average axial magnetic field intensity of GMM rod is in the range of 495 similar to 640A/m in the macro displacement of 0-20mm, and that the static thrust difference of macro moving part is controlled within 4N in the stroke of macro displacement 6-14mm, which indicates that the coaxial integrated design scheme of macro-micro composite actuator is feasible. The research results provide a theoretical basis for the development of large-stroke and high-precision actuators in the field of precision manufacturing.