Speed detection subsystem has been calibrated by the motor open-loop tests.
通过电机开环调试，标定了速度检测子系统；
The solar tracker has two working modes, open loop mode and closed loop one, and it consists of an imaging unit, a turntable, steppers, the subsystem of micro control unit, a computer and so on.
提出的太阳跟踪器具有开环和闭环两种工作模式，由成像单元、转台、步进电机、单片机、上位机等模块构成；
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