摘要：针对微纳卫星的高精度姿态控制需求，设计并实现了一种微小飞轮高精度控制系统。首先建立了微小飞轮的数学模型，提出了一种基于电流线性调整电路的力矩控制模式，设计了以C8051单片机为核心的数字控制系统，实现了数字PI控制、换相逻辑控制、改进倍频法转速测量、串口通信和电流A/D采样等功能。实验结果表明，该高集成度数字控制系统硬件实现简单、可靠，实现了微小飞轮的高精度力矩和速率控制。

关键词：微小飞轮；电流线性调整电路；数字控制系统; 力矩模式
Abstract: To satisfy the demand of high precision of micro-nano satellites′ attitude control, a mini flywheel high precision control system was designed and implemented. Firstly, the mathematical model of mini flywheel was established and a torque control mode based on current linear adjusting circuit. Designed a digital control system based on C8051, including the  PI control arithmetic, the commutation signal generating module for the inverter, the improved frequency multiplication rotating speed measuring module, the RS-232 serial communication and A/D sampling module. The experimental results show that the hardware realization of this system fulfills the demands of simplify, miniaturization and realiablity, the system meets the request of high precision torque and speed control.

Key words: mini flywheel; constant current circuit; digital control system; torque mode