多电动机自动投切控制电路设计
摘要
水冷作为高必能散热系统正变得越来越流行。水冷真正的优势在于它处理CPU瓦数的能力比任何风冷散热器都要高得多，并且不受机箱内高温的影响。如果用于低功率CPU，水冷散热器在CPU降温上并不比优良的风冷散热器强多少。但当你使用产生大量热量的高端或极度超频CPU的时候，就算一个小小的DIY水冷系统都将让CPU温度保持在相当低的水平。由此可知水泵的意义重大，为使系统能够正常运行，且可靠性增强，需要增补备用装置。水冷系统用于大功率元器件如晶闸管的散热，其工作的可靠性非常重要。一旦出现故障停止运行，需散热的大功率元器件将很快烧毁，对生产影响极大，一般采用两面三刀台水泵一台运行，另一台备用，实现自动投切，工作过程如下：起动一台水泵电机，该水泵运行信号指示灯亮，另一台水泵备用信号指示灯亮，表示可以随时投入运行，当正在运转的水泵电机因过载、缺相、短路等原因停止运行时，备用水泵电机立即起动，自动投入运行（即自动投切）。本文以两台7.5KW的三相笼型异步电动机为例，利用有关互锁作用对电机进行控制，从而达到一用一备，自动投切的控制。
关键词：水冷；互锁；自动投切
Abstract
As the high water Bineng cooling system is becoming more and more popular. The real advantage of water cooling is that it has a much higher capacity to handle CPU watts than any air-cooled radiator, and is not affected by the high temperature inside the chassis. If used in low power CPU, the water cooled radiator is not much better than the fine air-cooled radiator on CPU cooling. But even when you use a lot of heat to produce high end or extremely overclocking CPU, even a small DIY water cooling system will keep the CPU temperature at a fairly low level. Therefore, the significance of the pump is significant. In order to make the system run normally and the reliability is enhanced, it is necessary to add the standby device. Water cooling system is used for heat dissipation of high power components, such as thyristors, and the reliability of the system is very important. Once the failure to stop running, high power components requiring cooling will soon be destroyed, a great impact on the production, generally using a running play a double game pump, another backup, automatic switching, working process is as follows: starting a water pump motor, the operation signal of the pump light, the other a spare pump the signal indicator light, said can be put into operation, when the motor is running the pumps because of overload, lack of phase, short circuit to stop running, immediately start the standby pump motor, automatic operation (i.e. automatic switching). This paper takes two 7.5KW three-phase squirrel cage asynchronous motor as an example, uses the interlocking function to control the motor, so as to achieve the control of "one use, one standby" and "automatic switching".
Key words: water cooling; interlock; automatic switching
目录
第1章 绪论 …………………………………………………………4
1.1 设计背景介绍……………………………………………………4
1.2 设计任务简述……………………………………………………5
1.3 控制要求及技术难点……………………………………………6
1.4 设计任务…………………………………………………………6
第2章 设计过程 ……………………………………………………7
2.1 设计原理…………………………………………………………7
2.2 元器件选型………………………………………………………11
第3章 电气控制板的制作及操作说明 ……………………………14
3.1控制板制作要求…………………………………………………14
3.2自动投切系统的操作说明………………………………………16
3.3 故障及问题分析…………………………………………………17
参考文献………………………………………………………………21
参考文献
【1】李海军 刘宇《电气控制技术课程设计指导书》 2011
【2】吴晓君，杨向明《电气控制与可编程控制器应用》，中国建材出版社，2004
【3】张凤池 曹荣敏《现代工厂电气控制》，机械工业出版社
【4】《工厂常用电器设备手册》（第2版），中国电力出版社，1998
【5】《正泰电器产品选型手册》
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