Dsp-based Missile Steering Gear Servo Control System

Missile rudders are executive bodies of missile flight control system, all kinds of attitude motion of missile are depended on the actuator driver fins of rudders.All digital electromechanical missile actuators servo system is studied in this paper, in which the high quality Digital Signal Processor (DSP) and Pulse Width Modulation (PWM) techniques are used to realize the centralized control of four permanent magnet brushless DC motors (BLDCM). Based on analyzing the operational principles of actuators system, the control strategy and speed regulation of BLDCM are described emphatically, and the reason of its torque ripple and the way to eliminating or suppression are analyzed and illustrated, The control algorithms of single DSP to control four actuator of rudder which work independently have been studied, and the design schemes are given.The software designs of the electrical servo system are completed using position loop, speed loop and current loop adjustment after the hardware designs are presented in details. Also the efficiency of traditional PID control in practical actuator control system is compared with that of proportional-Fuzzy-PID control.At the end of the paper, all factors to affect system performance are analyzed, and optimization designs are presented.