Stepper motor control can be used as a special motor, do not use their accumulated error (accuracy of 100%) the characteristics of a wide range of open-loop control.
步进电机可以作为一种控制用的特种电机，利用其没有积累误差(精度为100%)的特点，广泛应用于各种开环控制。
Contrasted with the feedback loop this method is more accurate, the timing error is caught faster, the time resource is not necessary and it does not occupy resources of the hardware in DSP.
这种方法比反馈环法定时精度高，定时误差捕获快，并且不需要时钟源，不占用片内硬件资源，适合于全软件化设计要求。
It is proved that the proposed method can not only guarantee the stability of the closed-loop system, but also make the tracking error converge to the origin or its small neighborhood.
该方法不但能保证闭环系统稳定，而且可使跟踪误差收敛于原点或原点的一个小邻域内。
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