In order to compensate the disturbance torque caused by the movements of the payloads of satellite, a torque compensation mechanism based on ultrasonic motor is designed. The speed control effect of the proportional, integral and differential (PID) closedloop negative feedback control system based on the traditional control strategy is not satisfactory. In this case, the mathematical model of the system is established, and a closed loop speed control system based on fuzzy PI control is designed and compared with the traditional PI control system. According to the given form of the disturbance torque, the sine speed given curve of the flywheel is designed, and the simulation results show that the method can effectively compensate the load disturbance torque. In addition, a hardwaredriven control circuit based on a digital signal processor(DSP) chip is designed and experimentally verified. The results show that the algorithm is better than the traditional PI control, and the speed curve tracking accuracy is significantly improved.