Abstract:In order to realize the lightweight of the spatial scanning drive mechanism in the highresolution satellite payload, a scanning drive mechanism is designed with the ultrasonic motor as the driving component. The weight is only 15% of the conventional drive scheme combining the step motor with the harmonic reducer. A drive control system of the scanning drive mechanism is built. The equipment is used to test the high precision pointing control method of the scanning drive mechanism with the help of the 21bit absolute photoelectric encoder as the position feedback sensor. By comparing the efficiency of PID control, fuzzy control and neural network PID control algorithm, the ultrasonic motor temperature detection is taken as the forward feedback control online regulation control parameter considering the nonlinearity and timevariation of ultrasonic motor and hence a novel expert rule PID controller is proposed. The experimental results show that when the scanning drive mechanism is pointing at 20°, the steadystate pointing accuracy is better than 2", and the speed stability of the scanning drive mechanism is better than ±1% at 3.3 r/min, which meet the requirement of satellite payload for high precision and high stability control of the scanning drive system mechanism.