To set the proper parameter of register and on-chip ram of TMC428, it can make TMC428 control three stepper motor in the same time, and realize three-axis control system.

通过设置TMC428内部参数寄存器和片内ram的值，可使TMC428能够同时控制三个步进电机，实现三轴控制系统。

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At last, the hardware in the loop simulation system for three-axis stabilized satellite attitude control based on PC, with reaction wheel and gyro in the loop is designed.

最后，该文设计了一个基于PC机的三轴稳定卫星姿态控制硬件在回路仿真系统，将反作用飞轮、陀螺等实物接入仿真系统。

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The researches of this paper are very important and significative job to improve precision of servo-control system of three axis optical tracking test table even all type of electric simulator tables.

本论文的研究对于提高三轴光学跟踪试验转台以至于所有电动仿真转台的伺服控制系统的精度来说，是一项十分重要和有意义的工作。

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