The main subject of this paper is the design and development on electric actuator based on industrial ethernet with a transducer embedded in it , for which design higher performance is gained 研究的基本目的是开发出符合工业以太网要求的电动执行器，并且同时实现变频调速功能，以符合国外同类产品的发展趋势。
Using precision grades of the transmission parts as main variables , the authors put forward a set of method about optimal design of dkj electric actuators based on transmission error and backlash analysis 摘要该文针对dkj型电动执行器提出一种以传动零件精度等级为主要设计变量的基于传动误差和回差分析的优化方法。
When manual operating , by keystroke operation determines direction or reversion switch quantity output , and match with electric actuator can control liquid level or temperature of system . main technical parameters 1 可自动跟随阀位反馈值进行控制，控制输出信号可分别带一路模拟量控制输出或一路开关量控制输出可控制正反转，及一路模拟量跟踪输出。
If electric actuators is used for power souce of the controling braking and hydraulic pressure of the plane , the system of hydraulic pressure woulde be cancelled or reduced . then the reliability and maintain woulde be increased and the weight of the plane woulde be minished 采用电力作动器和功率电传技术作为飞机操纵、环控、液压、机轮刹车的动力源，减小或取消了集中式的液压系统，可以使飞机的可靠性和维修性大大提高，重量大大降低。
At the same time , industrial ethernet , one of the most popular control networks , is getting more and more attention of many manufactures and foundations for its own advantage . to catch up with this advanced technology and develop the electric actuator according to industrial ethernet stands , the primary purpose of this research is brought forward 而控制网络也在不断变革，特别是工业以太网因为其自身的众多优点，而被国内外自动仪表厂家看好，为此对工业以太网的研究被国家列为“十五”期间的“ 863 ”重点项目，本课题就是该项目的一个重要组成部分。
First in this paper , the control methods of electric actuators was studied and analyzed . the retangcle - wave permanent magnet brush - less motor is used for servo - motor , the reason of its torque ripple and the way to eliminating or suppession is analyzed and elaborated . in order to achieved wide - speed range , the method of variable structure control ( vss ) was used . , 论文分析了飞机电力作动系统的基本要求，选用方波直流无刷电机作为执行电机，采用重叠换向法、变结构控制策略和转速、电流双闭环pid控制方案，很好地解决了其固有的低速转矩脉动现象，达到调速范围宽、转矩脉动小的设计要求。
Being been produced upon advanced design and technology at home and abroad and fitted with advanced manual and electric actuators and accordance with the standard of 《 cj / t3006 - 1992 cast iron gate valve for water - supply and sewerage 》 , our valves are strong in sealing capability , good in antifriction , easy to mount , flexible for opening and closing and long in service life 本公司的闸门系列产品符合cj / t3006 - 1992 《供水排水用铸铁闸门》标准,该产品综合国内外先进的结构和工艺,并采用国内先进的手、电动控制装置,使得闸门具有密封性强、耐磨性好、安装方便、启闭灵活、寿命长等特点。
After the introduction of the selected elements , the thesis gives out a design which includes a front control center based on siemens s7300 plc 、 a line connection of the master profibus and the distributed intelligent i / o et200m system 、 a real - time display system of pressure sensors and a gas supply system with stop valve and electric actuator 本文在介绍了所选择器件情况基础上，设计了基于siemenss7300plc为前端控制中心，利用profibus总线接分布式智能i / o et200m系统，压力传感器现场显示，截止阀加电动执行器实现配气的方案。
Our company commission sell all kinds of pressure / difference pressure transmitter , temperature instruments , pressure gauge , paperless and penless recorder , programmble computer controller ( pcc ) , distributed computer system ( dcs ) , single / muticontroller , manus operator , electric actuator , control valve , plate and workbench of control room ， etc 本公司经营压力差压变送器、温度仪表、压力仪表、记录仪、 pcc 、 dcs 、单多回路调节器、手操器、执行器、阀门、控制盘台柜等门类齐全的自动化控制检测及执行器。
This dissertation investigates the electric brake thoroughly . the research includes : 1 . investigate the operational principle and the structure of the electric brake , establish the model of every part of it , specially investigate deeply the parts : electric actuator and brake torque feedback , make clear of the concrete structure of it and finish the calculation of the design 研究了全电刹车系统的具体工作原理及整体结构，建立了系统各个组成部分的数学模型，特别针对电刹车系统所特有的部件和结构：电作动机构和刹车力矩反馈控制作了深入的研究，确定了电作动机构的具体结构和设计参数，并在此基础上建立了系统整体的数学模型。
