电气系统

R. MacDonald is an experienced information scientist in the electronic and electrical engineering field. Following postgraduate research in optical fibre laser gyroscopes, he worked for Thomson Scientific from 1994 to 2007 as an indexer and abstractor of academic and scientific papers for the Inspec database, specialising in electronics, optoelectronics and semiconductor electronics, and later telecommunications.

acDonald 先生是一位经验丰富的电子和电气工程信息科学家，研究生阶段的研究内容是光纤激光陀螺系统。1994年至2007年间，他一直从事 Thomson Scientific 旗下 Inspec 数据库学术和科技文章，主要是电子学、光电子学、半导体电子学，以及电信领域文章的索引和摘要编辑工作。

In view of these problems,an intrinsically safe pilot circuit for underground motor intelligent protective systems based on single chip microcomputer is given according to the design specifications of intrinsically safe circuits and the requirements of microcomputer control systems.

井下最大的特点就是存在瓦斯和煤尘，而微机保护系统在发生故障时所产生的电火花或电弧是井下火源之一，因此对于井下电气设备及其控制系统必须采取严格的防爆措施以防止瓦斯和煤尘爆炸。

In this paper, the author takes the construction on pre-tensioned rain pipe in Huawei factory premises for-example and according to the characteristics of closenessrain drain system, gives the explanation of the cause and propose a reasonable solution.

以华为电气厂房雨水悬吊管破裂工程为例，根据屋面雨水排水系统中的密闭式内排水系统的特点，阐述了悬吊管破裂事故发生的原因，提出了相应的处理措施，以避免类似事故的发生。

Application of ABB Inverters In Single- roller ;2. Maintenance of water shielding and roller s in vacuum chamber on coating line;3. The control system of a ceramics roller is introduced.

介绍了陶瓷辊道的控制系统，对以三菱PLC为核心的电气控制系统的工作原理和程序进行了分析和说明。

Wire electrode based on the trajectory of the different forms of control, WEDM can be divided into three types: one is shaped by the imitation controlled cutting in line in advance and work to create the same shape by mold, when processing the workpiece at the same time rough and on the mold clamping in the machine tool table, in the process of cutting wire electrode tightly against the mold on the edge of the track for the mobile, thus cutting out and die on the same shape and precision to the workpiece; another One is the electro-optical tracking control, to carry out the cutting line, before the basis of certain parts to enlarge the proportion of drawings depicts an electro-optical tracking map-processing machines will be placed in design stage of electro-optical tracking, tracking platform Photoelectric first line of graphics has always been to follow the track of the Mexican campaign, and then through the use of electrical, mechanical linkage to control the machine tool table, together with the workpiece so相似形wire electrode relative movement, thus cutting out the same shape and design to the workpiece; again a digital control, the use of advanced automatic control of digital technology-driven machine tool in accordance with the pre-processing parameters according to the workpiece geometry pre-processing procedures for the preparation of a good CNC auto-complete processing, the production does not require appearance on board the need to map to enlarge map of the previous two form of control has a higher machining accuracy and a broad range of applications, both at home and abroad more than 95% have adopted WEDM NC.

根据对电极丝运动轨迹的控制形式不同，电火花线切割机床又可分为三种：一种是靠模仿形控制，其在进行线切割加工前，预先制造出与工件形状相同的靠模，加工时把工件毛坯和靠模同时装夹在机床工作台上，在切割过程中电极丝紧紧地贴着靠模边缘作轨迹移动，从而切割出与靠模形状和精度相同的工件来；另一种是光电跟踪控制，其在进行线切割加工前，先根据零件图样按一定放大比例描绘出一张光电跟踪图，加工时将图样置于机床的光电跟踪台上，跟踪台上的光电头始终追随墨线图形的轨迹运动，再借助于电气、机械的联动，控制机床工作台连同工件相对电极丝做相似形的运动，从而切割出与图样形状相同的工件来；再一种是数字程序控制，采用先进的数字化自动控制技术，驱动机床按照加工前根据工件几何形状参数预先编制好的数控加工程序自动完成加工，不需要制作靠模样板也无需绘制放大图，比前面两种控制形式具有更高的加工精度和广阔的应用范围，目前国内外95%以上的电火花线切割机床都已采用数控化。切割属电加工范畴，是由前苏联人发明的，我国是第一个用于工业生产的国家，当时由复但大学和苏州长风机械厂合作生产的这是最早的机型叫复旦型，我们国内在此基础上发展了快走丝系统。欧美和日本发展了慢走系统LS

The fault on the tool post may be due to the breakdown of machinery,electrical as well as control system.

0引言TDNC150A数控车床属台式数控车床，体积轻巧、结构紧凑，装有四工位自动回转刀架，使用WA-21S数控系统；它是典型的由单片机和步进电机组成的经济型数控车床，由于其价格低、适应性好，常常用于教学和普通零件加工；它的刀架结构是蜗杆蜗轮式，能够独立控制，要使其正常工作，涉及到机械、电气、控制系统等的稳定可靠工作。

More than ten years ago,"the negative day" the numerical control line cutting engine bed first applies and the actual production, starts the control bench is uses the transistor separative element assembly to become, after but uses the integrated circuit, now to is using the direction which the microcomputer controls to develop, Therefore this definition design "the electrical fire colored thread cutter automatic control" is by 8031 shrapnel machine took the control core, step-by-steps the electrical machinery achievement to actuate the electrical machinery, the diffraction grating a closed-loop control system which constitutes as the position examination part.

十多年前，&负旦型&数控线切割机床首先应用于实际生产，最早控制台是由晶体管分离元件组装而成，逐渐采用集成电路，现在正向采用微型计算机控制的方向发展，因此本论文设计的&电火花线切割机的电气控制系统&是以89C55单片机作为控制核心，步进电机作为驱动电机，光栅作为位移检测元件而构成的一个闭环控制系统。

Microwave and millimeter-wave filters and diplexers are important components for channel selection and signal separation in many communication systems. Their electrical performances are crucial for the overall system design.

在多数通信系统中，微波、毫米波滤波器和双工器是信道选择和信号分离的重要器件，它的电气性能对于整个系统至关重要。

The equipment is made of chassis, control unit, electromagnetic valve and piping.

本机主要由机架、电气控制箱、电磁阀、气动元件、气冲系统和水路系统组成。

The article investigates the designing automatic control device for diving wall column.

介绍了分隔壁塔的分配比自控的设计及控制器控制系统原理和电气控制系统。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。