PLC控制步进电机频率曲线的优化

根据PLC对步进电机的驱动器发送脉冲信号和方向信号驱动步进电机工作的原理,通过合理修改步进电机的频率曲线的各种参数,可使PLC 控制步进电机的运行速度得到最优化。     

NAGEL珩磨机步进涨刀系统问题分析

本文介绍了NAGEL珩磨机步进涨刀系统的控制原理,通过分析引发步进电机驱动器频繁损坏的原因,找到解决故障重发的办法,显著提升了设备的开动率。     

基于CPLD的两相步进电机细分驱动器设计

利用CPLD芯片、D/A转换器和功率放大电路设计步进电机细分驱动器,该驱动器可驱动电机正向或反向转动,最大可实现步距角的128细分,并且细分数可调,能对步进电机实现精确、实时的控制并且成本低廉。     

基于PLC的步进电机控制系统设计

本设计以西门子公司的S7-200可编程逻辑器为中央处理模块,以两相步进电机为控制对象,介绍了西门子S7-200PLC的控制原理和系统总体设计方法,并从软件设计方面详细地讲解了如何用PLC的移位指令和高速脉冲输出指令实现对步进电机的控制.     

可编程逻辑控制器(PLC)在数控系统点位控制中的应用

本文通过对防止步进电机运行时出现失步和误差、保证定位精度与提高定位速度之间的矛盾、可变控制参数的在线修改,以及控制系统的方案等方面进行了比较深入的研究,提出了利用PLC控制步进电机实现数控系统点位控制功能的有关见解与方法。     

步进电机的并口控制研究

步进电机的控制方法有很多，但通过并口实现对步进电机控制的做法并不多见，本结合工程实际，在分析步进电机控制原理的基础上，介绍并口在步进电机控制中的应用方法，并给出了相关的控制程序.     

可编程逻辑控制器（PLC）在数控系统点位控制中的应用

本文通过对防止步进电机运行时出现失步和误差、保证定位精度与提高定位速度之间的矛盾、可变控制参数的在线修改，以及控制系统的方案等方面进行了比较深入的研究，提出了利用PLC控制步进电机实现数控系统点位控制功能的有关见解与方法。     

用PLC脉冲信号实现对步进电机角位移的控制

利用西门子PLC配置位控模块输出的脉冲信号,驱动步进电机控制器完成了对步进电机转动角位移的控制,达到了位置控制的目的.同时,也满足了工业现场的需要.     

PLC控制步进电机断点恢复的两种方法

PLC输出脉冲串控制步进电机过程中,突然断电,用PLS指令PLC很难继续完成本次步进,可以用位置向导生成的PTOxRUN等子程序实现对步进电机的控制,使上电后,步进电机继缘完成本步任务。介绍两种上电后继续走完本次步进的断点恢复方案。     

采用微处理器的步进电机控制系统

步进电机是应用于机电一体化控制系统中的一种常用的执行元件.控制系统要求步进电机控制的设计要能更好地服务于整个系统,而微型处理器与微机技术的日渐成熟,其良好的性价比,可更好地服务于步进电机控制系统.根据步进电机的工作原理和其基本的控制方式,通过接口电路,使不同的步进电机在任意通电方式下被有效地控制,利用脉冲分配,实现通电方式,又根据其通电规律,由软件编程列出数据表,微型处理器强大的数据处理功能使编制软件查表法实现对各种步进电机的控制.在此基础上,对采用微处理器控制步进电机方法进行深入探讨,并给出适应多种步进电机运行方式的软件程序.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.