Design of electric actuator for height keeping towed target

TAO Degui, LIU Guanxin, WANG Lei

(PLAC 92419 Unit, Xingcheng 125106, China)

Abstract: To achieve the height control function of a certain seaskimming and height keeping towed target system, the electric actuator and the rudder loop control circuit were designed. The electric actuator was composed of combined screw drive system, sliding block, bracket, rocker arm and wing angle feedback potentiometer. The rudder loop control circuit was the double closedloop structure which was made up of position loop and current loop. According to the performance index requirements, the spiral sliding screw spindle drive mechanism was adopted and the related parameters of toothshaped angle, nominal diameter and lead were determined. According to these parameters, the lengths of nut and thread were calculated, and then the selflocking condition of drive mechanism was verified. By the calculation of reduction ratio, the type of reduction gearbox was chosen appropriately. Through the calculation of motor power and speed constant and with the sample data sheets as reference, the type of motor was chosen and index′s checking computation was completed. The rudder loop control circuit was designed, in which the L292 power amplifier module was used as DC motor drive. The brief explanation of the position feedback and current feedback was given. The experiments and application results show that, the system has reasonable design and meets the requirements of the practical application.

Key words: towed target; DC motor; spiral sliding screw spindle; electric actuator; PWM power magnifier