恒高拖靶舵机系统的设计

Design of electric actuator for height keeping towed target

为了实现某型掠海恒高拖靶系统的高度控制功能,设计了舵机执行机构和舵回路控制电路。舵机执行机构由组合式螺杆驱动系统、滑动块、支撑架、摇臂及翼角反馈电位器等组成。舵回路控制电路由电流环和位置环组成的双闭环控制结构。针对具体性能指标要求,采用了螺旋滑动丝杠传动机构,确定了牙形角、公称直径和导程等参数,并计算了螺母和螺纹的长度,验证了机构自锁条件;通过对减速比的计算,选择了合适的减速箱型号;通过对电机功率及速度常数的计算,参照电机样本数据表资料,完成了电机的正确选型,并进行了指标验算;设计了以L292功放模块为直流电机驱动器的舵回路控制电路,并对位置反馈和电流反馈作了简要说明。实际使用结果表明,该设计合理、可靠,各项性能能够满足使用要求。

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 adopt- ed 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 de- signed, 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.