共查询到20条相似文献,搜索用时 203 毫秒
1.
2.
新型无触点开关传感器─—硅磁敏晶体管湖南省建筑科学研究所周迪文目前,国内外对无触点开关、磁探场的需要,我国自制半导体3CCM型磁敏晶体管,用作各种传感器(含遥讯遥测遥控),如工厂、矿山运送滚轮检测的传感器,汽轮机低速盘车系统的关键就是低速测量的传感器... 相似文献
3.
介绍一种静态无触点光控开关,该开关无触点无噪音、容量大、寿命长,可广泛应用于厂矿、码头、货场、道路和桥梁等需要照明的场所。 相似文献
4.
5.
6.
固态继电器在伺服电机控制中的应用 总被引:2,自引:0,他引:2
固态继电器SSR,又称为固态开关,是一种弱电信号控制强电开关的无触点开关器件,它利用分立元件、集成器件及微电子技术,实现输入回路与输出回路之间光电隔离,达到无触点、无火花、无噪声接通和断开电器的目的。 相似文献
7.
平煤五矿原电控系统采用继电器-接触器切换转子电阻方式调速,控制方式落后.采用无触点开关方式进行改造,重点分析了无触点开关的工作原理,给出了一种新的触发电路. 相似文献
8.
笔者设计了一种智能无触点开关控制器,该控制器是由智能微控制器dsPIC和电力电子器件IGCT组成的一种新型开关器件。与电磁式有触点开关相比,具有无触点、快速、无火花、低开关损耗、可靠性高、使用寿命长等特点,并且通过微控制器实现对开关的监控和保护。整个开关控制器系统实现了控制功能、保护功能、测量功能、显示功能。 相似文献
9.
一、开发经过近来微机的普及相当惊人,各种机器、装置中都在广泛利用。对应这样的计算机时代,即使在微动开关领域内,也开发了长寿命的、能直接耦合微机的产品。一般的微动开关具有微小的触头开距和快速动作的机构(以下称微动开关),它的外形、额定值、触头开距等各项规定在JISC4505中都有解说。相对于有触点开关的无触点开关,特别对无触点微动开关,很多公司已作过报道,指的是一种利用光元件、霍耳集成电路的商品。本文叙述利用光元件的无触点光微动开关(以下称光微动开关)。1.光微动开关名称的由来 相似文献
10.
适合频繁起动的绕线式异步电动机的无触点控制方案,最大的特点是用无触点开关代替了定子侧的交流接触器,并取消了控制回路中的继电器,而转子侧采用了IGBT斩波方式的无触点变阻起动。 相似文献
11.
智能型低压无功补偿开关集合了接触器和晶闸管无功补偿电容器投切开关的优点,具有功耗低、无冲击、无畸变的显著特点。 相似文献
12.
13.
Le Liu Nuan Shao Minghao Lin Yiming Fang 《International Journal of Adaptive Control and Signal Processing》2019,33(4):626-643
The adaptive robust control problem for the speed and tension system of reversible cold strip rolling mill is studied based on the Hamilton theory in this paper. First, the dissipative Hamilton model of the rolling mill system's speed and tension outside loop is built through pre‐feedback control, and then, dissipative Hamilton controllers are designed by utilizing the interconnection and damping assignment and the energy shaping method. Second, in order to realize tensiometer‐free control and adaptive robust control for the perturbation parameters and load disturbance, full‐order state observers and adaptive robust controllers are designed for the rolling mill system's speed and tension outside loop by using the “extended system + feedback” method. Third, robust controllers for the rolling mill system's current inside loop are designed based on the cascade control thought, so as to realize the tracking control for the speed and tension of reversible cold strip rolling mill. Theoretical analyses show that the resulting closed‐loop system is stable. Finally, simulation research is carried out on the speed and tension system of a 1422‐mm reversible cold strip rolling mill, and simulation results verify the validity of the proposed control strategy in comparison with the decentralized overlapping control strategy. 相似文献
14.
15.
刘斌 《可编程控制器与工厂自动化(PLC FA)》2005,(12):85-87
宝钢2050热轧厂的粗轧机由四个机架组成,R1、R2为可逆式,R3、R4为不可逆式连轧机,要实现R3、R4连轧,则R3、R4的速度匹配的关键。他们的匹配主要由微张力控制功能来实现。本文主要阐述其微张力控制原理,现场应用中出现的问题及改进的优化措施。 相似文献
16.
可逆轧机板形辊与带材的不同步造成带材的表面划伤及卷径跳动,针对可逆轧机板形辊控制的工艺要求,在分析其原有控制原理的基础上,提出板形辊速度与带材速度不同步及张力波动的原因。通过对原有板形辊传动控制方案的改进及补偿转矩的优化,从而提高板形辊与带材的同步度,解决了卷径跳动及张力波动问题,提高了轧机运行的稳定性,从而有效地提高了带材的表面质量及产量。 相似文献
17.
The availability of large quantities of electrical power and sophisticated means of control has justified the use of induction methods in heating large steel slabs to rolling mill temperatures. Capable of delivering 210 MW, a unique power system, comprising power transformers, autotransformers, static switches, and capacitor banks, provides eighteen induction heaters with controlled electrical energy. The entire system can deliver 600 ton/h of steel to the rolling mill. The basic overall automatic control scheme involves the operations of slab handling control, heater control, static power switching, and computer control. The control functions, including phase balance and demand limit control, are described and discussed. The features and operation of the static power switch, capable of switching close to 10 000 A, are presented. Used as a protective device, the switch can clear up to 210 000-A faults in less than one cycle. 相似文献
18.
可逆轧机速度控制及压下APC控制实践 总被引:1,自引:0,他引:1
介绍了可逆轧机速度控制的控制方式和编程思路 ,分析电动压下APC的控制原理 ,并介绍了工程实践中为实现APC的快速性和准确性所采用的控制方法 相似文献
19.
Sample Steven B. Scheuer Paul R. Silva Leroy F. 《Industry Applications, IEEE Transactions on》1977,(3):254-260
A laboratory testing program which was conducted on triacs used in a prototype all-solid-state household dishwasher is described. This testing program was deemed necessary after an inordinately high number of failures of the triacs were encountered in field testing, even though the triacs were being operated well within their published specifications. The operation of triacs, the specific appliance application, and a comparative triac testing plan are described. The test results which led to the selection of a triac which met the high-reliability criteria are given, as well as some specific recommendations for the use of triacs in appliance applications. 相似文献
20.