Design and analysis of power system of micro-electromechanical actuator

In order to apply the electromechanical actuator to tactical mini-missiles, this paper researches on the key technology such as load-bearing ability, rapidity and miniaturization of the micro-electromechanical actuator power system based on the ball screw. First, according to specific technical indexes, the power, electromechanical time constant and the size of the motors are screened originally through theoretical analysis. Finally, based on the characteristics of ball screw transmission, load locus of the micro-electromechanical actuator dynamic system is theoretically analyzed and the optimum speed ratio is determined through parameter optimization. The results of the double closed loop controlled test on the principle prototype show: the system can operate normally with 2.5N·m hinge moment; the system bandwidth can reach 25.3Hz on the condition of no load and 23.4Hz on the condition of load; maximum rotational speed of output shafts is greater than 250°/s. Test results basically correspond to the requirement of technical indexes. It is proved that this analysis and design method is congruent with the design of micro-electromechanical actuators, thus the method is feasible.