Stepping motor control by pulse, by changing the order of power to change the direction of rotation motor, change the pulse frequency may change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Changing the speed of electric motor by using ac frequency conversion is to regulate output flow of hydraulic pump to control the velocity of the motion of hydraulic actuator.
通过交流变频调速改变电机的转速来调节液压泵的输出流量。控制液压执行元件的运动速度。
This machine adopts micro-computer system to control the frequency-changing metre and with infinite speed adjustment.
本机采用微机程序控制变频器，无级调速。
The control aim is accomplished by changing the speed of the motor according to the frequency and running steady.
实验结果实现了电机的变频调速，且速度稳定，达到了论文提出的控制目标。
The control aim is accomplished by changing the speed of the motor according to the frequency and running steady.
实验结果实现了电机的变频调速，且速度稳定，达到了论文提出的控制目标。
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