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In view of the present major problems of the open-loop control system for economic CNC lathe with stepping motor as feed motor, a newtype of closed-loop control system for stepping motor has been presented in the paper.

针对目前以步进电机驱动的经济型 CNC车床开环控制系统存在的主要问题，提出了一种新型的步进电机闭环控制系统。

An Open-loop control system utilizes an actuating device to control the process directly without using feedback.

开环控制(Open-loop Control)——系统的输出端与输入端之间不存在反馈回路，输出量对系统的控制作用没有影响。

The teaching experiments such as open-loop control system, closed-loop control system, machine vision and the sensor measuring were realized based on the hardware platform and the software.

通过对系统硬件平台和软件平台的构建，完成了开环控制系统、闭环控制系统、机器视觉、传感器技术等多项教学实验内容。

Mechanical parts of the original target ordinary screw, the drive motor and control components of the transformation, the transformation of the system after a stepper motor, ball screws and other components, form a open-loop control system.

机械部分主要针对原普通丝杠、驱动元件和控制电机的改造，改造后的系统采用了步进电机，滚珠丝杠等元件，构成了一个开环控制系统。

This thesis make a study on Vector-contorl WVF system of asynchronous motor. In the course of study, making use of the mathematical model of asynchomous motor in MT axes. Then both open-loop control system and close-loop vector-control system are respectively simulated with simulation block SIMULINK in MATLAB.

本文对异步电动机变频调速系统进行了研究，利用异步电动机在二相同步旋转MT坐标系下的数学模型，使用MATLAB中的仿真工具箱SIMULINK分别对开环控制系统和闭环矢量控制变频调速系统进行了仿真。

The step motor can receive digital signal directly and has the ability to response outer environment immediately and has no accumulation error, which often is used in driving system. In this driving system, open-loop control system is composed of stepping motor, which can satisfy the demand not only for control precision but also for the target of economic and practicality. On this basis , the analysis of stepping motor in power calculating and style selecting is also given.

由于步进电机能够直接接收数字量，响应速度快而且工作可靠并无累积误差，常用作数字控制系统驱动机构的动力元件，因此，在驱动装置中采用由步进电机构成的开环控制方式，这种方式既能满足控制精度的要求，又能达到经济性、实用化目的，在此基础上，对步进电机的功率计一算及选型问题经行了分析。

It proposes the control-output transfer function of the nondeal Buck converter using circuit average method, the model in Pspice 10.0, the open-loop and gain of the voltage control loop simulations of the system. A prototype of output power 15W has been made up, and the experimental results are agreed with the simulative results.

用电路平均建模法推导出非理想Buck变换器控制-输出的传递函数，在PSpice10.0环境下建立了仿真模型，对系统进行了开环和电压控制环路增益仿真，并在研制的15W实验样机上进行了系统的实验测试。

Simplified operation control panel: centralized control of all buttons.

1操作控制面板：本机各部控制，集中面板操作。

As an interdiscipline of artificial intelligence , operational research , and control theory , intelligent control ...

作为人工智能，运筹学与控制理论交叉的智能控制研究近年来一直是国内外学者关注的一个热点。

After the operator giving the voiced command, the control system will make an internal processing, execute querying, and will give corresponding control signals.

操作人发出语音指令，系统接受后在内部进行处理、查询，产生响应控制信号。

The shaping method of noncircular part and the tool holder's radial motion characters in noncircular turning process are discussed in detail in the thesis.

论文详细研究了非圆零件的成型方法和加工过程中刀架的径向运动规律。

I have not really liked him,I do not like his this kind of disposition.

我没有真的喜欢他，我不喜欢他的这种性格。