固态继电器用作交流电子开关时负载的保护

1．概述在自动化加工领域，机床传统的硬接线继电接触器逻辑控制正迅速被可编程控制器（PLC）或微机控制系统所代替。但PLC或微机控制系统只解决控制逻辑的“柔性”问题，象功率电动机这样的负载，还需后接功率继电器来充当其受控的开关器件。由于传统的交流接触器为电磁式开关，其机械触点的寿命及可靠性与PLC或微机控制系统相差甚远，较大地阻碍了控制系统性能的发挥。固态继电器（SSR）是一种由固态电子元器件组成的新型无触点电子开关器件，它利用分立元件，集成器件及微电子技术，实现了控制回路与负载回路之间的电隔离及信号耦合…     

电器质差引起的故障

今年我厂大修一台C5116A型的立式车床时，将送给调速控制电路（图1）的电器全部更换为新电器。进给电动机为交流双速电机。在调试时发现，主令开关KAI置于I档时，进给电机接成三角形运转，三相电流平衡．当主令开关KAI置于档，送给电机被接成双星形运转时，热继电器立即动作，交流接触器KMg恢复常开状态。停车检查．电气主回路和控制回路都没有接线错误，双速电机的6个出线头的分组连接也是正确的。再次试车时，一换到n档又发生上述现象。笔者怀疑是掉相造成电机电流过大而引起热继电器动作的。电工拆除连接电机的连线后．再进行无负载…     

固态继电器及其在开关电路中的应用

固态继电器(SSR)是一种由固态电子器件组成的新型的无触点开关器件。它利用分立元件、集成器件及微电子技术实现控制回路(输入)与负载回路(输出)之间的电隔离和信号耦合,达到触无触点、无火花接通和断开电路的目的,具有工作可靠、驱动功率小、开关速度快、使用寿命长、无噪声、抗干扰的特点。且能与CMOS、TTL、HTL等数字电路相兼容,因此,它的应用领域十分广泛,诸如微机的I/O接     

常州西整电子科技有限公司

常州西整电子科技有限公司坐落于著名数学家华罗庚的家乡——金坛市，扬溧高速、宁常高速穿境而过。交通便捷。该公司是以开发、生产电力半导体元器件及各类焊设备的控制电路板为主题的企业，是集生产、科研为一体的高新技术企业，主要生产各种整流管、晶闸管桥臂模块、单相、三相模块，以及交流无触点开关模块、固态继电器等产品。公司生产的电力半导体模块已广泛用于交直流电机控制、电焊机、励磁电源、充电电源、静止无功补偿、无触点稳压器、变频调速、电动机歇起动，以及各种自动化工业装置。     

SR型固态继电器

FUJI固态继电器供电子装置的输出接口电路使用。其输入电压可靠范围为：输出预定值为：。SR系列继电器利用了光电子耦合器，该光电子耦合器允许对输出和输入电路进行电力隔离。因此，可使输入电路免于遭受由开关颤动或噪音引起的有害影响。其固态结构消除了机械噪音。该继电器被推荐在闪光灯、恒温控制装置及其他开关频繁的电路中使用。单边引入导线（SIL）插件继电器为薄型。可把它安装在印刷电路板上。插入式继电器的体积与HH型控制继电器的体积等同。特点1．使用光电子耦合器进行电力隔离2．适用于零交叉开关电路3．配有CR电涌吸收…     

机床三相电动机保护电路的改进

我国普通机床的三相电动机通常是采用热继电器作为电机保护.但是,由于热继电器故障或选配不当,熔断器熔断,电源线路故障,接触器主触头被卡阻不能吸合,触头接触不良电源电压过低不能完全吸合,都能造成三相电源断相,使电机绕组烧毁.据统计,我国每年因断相烧毁的电机占绕组修理量的70%以上.根据以上的原因,我们在普通机床上装入了三相固态断相保护继电器,通过一年多的实践,取得了满意的效果.     

电源缺相保护电路的探讨

由于电网自身原因或电源输入接线不可靠,开关电源有时会出现缺相运行的情况,且掉相运行不易被及时发现。三相电机在现代工业中使用非常普遍,其开关主要由三相交流接触器控制,其控制原理是:三相交流接触器线圈的其中一个输入端与三根入线相线中的其中一根连接,三相交流接触器线圈的另一个输入端串接起动装置后三根入线相线中的另一根连接。打开起动装置后,三相交流接触器线圈通电产生磁性,吸引触点开关闭合,电路接通,三相电机开始运行。若与三相交流接触器的线圈连接的两根相线其中一根断电,则三相交流接触器的线圈断电,磁性消失,三相交流接…     

专利信息

自动断电开关；探针式电子限位开关；空气开关智能控制器；一种带回转件的塑壳断路器；新型带有接线端子的三相磁保持继电器……     

交流弧焊机遥控调流装置

本交流弧焊机遥控调流装置,由时间继电器、正反转电磁开关、电磁步进式开关、电磁开关、继电器和电阻、电容等元件组成,其控制电路见下图。控制程序如下: 首先接通电源开关K:,再接通控制电源开关KZ。这时产生的脉冲电流通过电容器C;限流,经交焊机初级     

GSJ2G-100H系列交流固态继电器介绍

本文通过对GSJ2G-100H系列交流固态继电器产品用途、特点、主要技术指标、应运领域以及使用方法的分析介绍,对电气设计人员正确使用和学习固态继电器相关知识具有很好的参考价值。     

Ag-Al-O体系中纳米Ag形成过程研究

为了研究Al-Ag固溶体在氧化气氛下热处理过程中Ag的扩散行为与转变过程,采用雾化与高能球磨相结合的方法制备合金粉末,氧化反应合成制备Ag/Al2O3复合材料,通过BSE、XRD、分子动力学的方法,对形成过程的物相变化进行研究。结果表明:Al-Ag固溶体在600K能够实现较高的单质Ag的析出量,析出的Ag能够控制在纳米尺度内,析出过程伴随着Al2O3致密氧化膜的形成以及内部合金相的转变,计算模型合理地解释和预测了实验结果。     

Microstructural control of and mechanical properties of mechanically alloyed tungsten heavy alloys

93W-5.6Ni-l.4Fe tungsten heavy alloys with controlled microstructures were fabricated by mechanically alloying of elemental powders of tungsten, nickel and iron by two different process routes. One was the full mechanical alloying of blended powders with a composition of 93W-5.6Ni-l.4Fe, and the other was the partial mechanical alloying of blended powders with a composition of 30W-56Ni-14Fe followed by blending with tungsten powders to form a final composition of 93W-5.6Ni-l.4Fe. The raw powders were consolidated by die compaction followed by solid state sintering at 1300°C for 1 hour in a hydrogen atmosphere. The solid state sintered tungsten heavy alloys were subsequently liquid phase sintered at 1445∼1485°C for 4-90 min. The two-step sintered tungsten heavy alloy using mechanically alloyed 93W-5.6Ni-l.4Fe powders showed tungsten particles of about 6-15 μm much finer than those of 40 um in a conventional liquid phase sintered tungsten heavy alloy. An inhomogeneous distribution of the solid solution matrix phase was obtained in the two-step sintered tungsten heavy alloy using partially mechanically alloyed powders. The two-step sintered tungsten heavy alloy using mechanically alloyed 93W-5.6Ni-l.4Fe powders showed larger elongation of 16% than that of 1% in the solid state sintered tungsten heavy alloy due to the increase in matrix volume fraction and decrease in W/W contiguity. Dynamic torsional tests of the two-step sintered tungsten heavy alloys showed reduced shear strain at maximum shear stress than did the sintered tungsten heavy alloys using the conventional liquid phase sintering.     

Phase equilibria in the Nb-Ga-As system below 1000 °C

The Nb-Ga-As solid state equilibrium phase diagram was determined at 600 °C with the use of powder X-ray diffraction (XRD), electron probe microanalysis (EPMA), and scanning electron microscopy (SEM). No ternary Nb-Ga-As phases were found, and limited solid solubilities were measured in the constituent binary Nb-Ga and Nb-As compounds. The phases GaAs, NbGa₃, and NbAs coexist with each other to form a three-phase equilibrium that dominates the GaAs side of the phase diagram. The phase diagram is in agreement with interfacial reaction studies, which have shown that NbGas and NbAs are the stable phases when Nb thin films are reacted to completion on GaAs.     

预变形及液固两相区等温处理对ZA27合金铸态组织的影响

研究了固液两相区等温处理对铸态ZA27合金初生相形貌的影响,结果表明：在固液两相区进行等温处理时,枝晶熔断受固液界面处原子的散控制,提高等温温度、延长等温时间因有利于Zn和Al原子的扩散而促进初生相由枝晶向颗粒状晶演变,预变形促进初生相形貌演变的根本原因在于等温处理时液相沿预变形产生的亚晶界的熔渗。     

Hardening kinetics of the stress-strain state of a cylinder made of steel 45

The stress-strain state of a material in hardening is calculated for a solid cylinder as an example on the basis of the theory of thermoplasticity with the use of the associated flow law and the Mises criterion. The microscopic inhomogeneity of the medium caused by structural and phase transformations is represented schematically by a structural model in correspondence with which each phase is considered as a continuous medium with boundaries moving in the course of the phase transformation or under the action of a force.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 30 – 34, September, 1996.     

A new electrical contact alloy with high reliability based on gold

A new gold alloy (NSCGA) was designed and prepared for light duty precision contacts. The microstructure, mechanical, electrical and applied properties of the NSCGA alloy were studied. The NSCGA alloy contains copper, palladium, platinum, nickel and rhodium as well as gold. The unique structure comprised of two phases, a gold-rich solid solution as the matrix and a platinum-rich solid solution as a strengthening phase. The matrix presents short-range ordering in the temperature range 200-900°C, which leads to the specific resistance of the alloy decreasing, and a modulated structure at low temperatures, which is responsible for age strengthening. The NSCGA alloy has low specific resistance, high tensile strength and high Vickers hardness. Various TO-5 type relays (TO-5 relay is a sealed mini relay with magnetic preservation) with NSCGA alloy as contacts were prepared and tested in a special relay factory under industrial conditions. NSCGA alloy contacts showed stable and low contact resistance, long loading life and high reliability, superior to that of an available conventional sixcomponent palladium alloy. The NSCGA alloy and the composites with NSCGA alloy as a covering layer and copper alloys as a base have been evaluated in various TO-5 type mini relays and other electric products.     

顺序逻辑控制电路的逻辑分析法

列出顺序逻辑控制电路的主令开关状态表和受控电器逻辑电路的逻辑表达式，对逻辑表达式的输入逻辑变量进行标记，根据标记便可确定受控电器在各个工步的得失电状态。     

PLC顺序控制系统的几种简易设计方法

提出设计PLC顺序控制系统的4种简易方法,分别是:(1)逐步得电同步失电设计法;(2)逐步得电逐步失电设计法;(3)置位/复位指令设计法;(4)移位指令设计法.这4种设计方法的思路是首先设计步进阶梯,在步进阶梯实现由转步主令信号控制辅助继电器的得失电,而且每一程序步的辅助继电器的得电必须以前一程序步的辅助继电器的得电为前提;然后根据步进阶梯设计输出阶梯,在输出阶梯实现由辅助继电器控制输出继电器得失电.     

共格沉淀析出过程的模拟Ⅰ--微观结构演化

采用相场模型对共格沉淀析出过程微观结构演化进行模拟研究.模拟结果表明,应力场的存在将会对相变过程中析出相形态产生显著的影响,通过界面能与弹性应变能的相互竞争析出相在不同阶段呈现不同的形态如模量结构、网格结构、三明治多畴结构、沉淀宏观点阵结构以及板条状等;此外,点阵错配度中等(2%～4%)时,粒子的粗化过程将出现应力诱导反向粗化现象,这种粗化现象取决于粒子的点阵错配度与体积分数.     

Reduction reaction in Al-CuO powder mixture driven by mechanical alloying

lINTR0DUCTIONNan0-sizedparticlesreinforcedmetalmatrixcomposites["'Jandnano-sizedelementalmetalparticles['~'Jcanbeobtainedbycertainreactionsduringball-millingwhicharedifficulttooccurunderconventionalconditions.ThemechanicallydrivenreductionreactionofCuO(orCu,O) M-Cu M.O.(M=Al,Ca,Mn,Ti,Fe,Ni,etc.)hasbeenappliedtoproducenan0-sizedCuparticles.However,themechanismofthedis-placementreactionprocesshasnotbeenwellun-derstood.InSchaffer'sopinion,localreactionisbelievedtooccurspontane0uslywhe…