摘要在当代社会，随着工业科技飞速的发展，给我们的生活带来各种各样的便利，各行各业都与工业产品息息相关。而在工业的生产中，是离不开各种机械的工作应用，离不开电力系统的帮助，也同样离不开电动机的运转使用。而电动机的运转使用同样离不开控制系统的运用。现在的电动机种类繁多，如何选型一种适合，便于使用且运行效率高的电动机是需要考虑的问题。根据所要求的生产工艺来选型一款合适的电动机，是非常必要的。直流电机的虽然调速简单，但是成本很高而且发出的噪声非常大，而交流电机虽然没有直流电机的缺点，但是调速却非常困难。但是变频器的飞速发展却为交流电机调速提供了非常大的帮助。77231

本课题是通过PLC系统控制变频器对电动机的速度进行控制，采用编码器进行反馈，使整个系统实现闭环调速控制。通过反馈可以使PLC系统运行更加精确，对系统进行实时性的监控控制。最后通过组态模拟可以清晰的看到整个系统的运行。

毕业论文关键词：小型可编程控制器  三相异步电动机  变频器 

Three-phase asynchronous motor closed-loop speed control and remote monitoring system design

Abstract In the contemporary society, industry rapid development of science and technology bring many kinds of convenience to our life, all walks of life all is closely related to industrial products。 In industrial production, we are inseparable from a variety of mechanical work application, can not do without the help of power system, also cannot leave the motor running。 The motor operation using the same choice without the use of the control system。 Now there is a wide variety of motor, how to choice a suitable, easy to use, and the motor is of high efficiency issue to consider。 According to the requirements of the production process for selecting a suitable motor。 Although the speed of dc motor is simple, but the cost is very high and the noise is very big, although there is no dc motor and ac motor faults, but it is very difficult to control。 But the rapid development of frequency converter for ac motor speed control provides a very big help。 This topic is controlled by PLC system frequency inverter to control motor speed。 THE feedback makes the whole system to achieve the closed-loop speed control。 Through feedback PLC system can be more precise, to control the real-time monitoring system。 Finally, the configuration simulation can clearly see the operation of the whole system。

Key Words: Small programmable controller   Three-phase asynchronous motor- frequency converter   

目录

摘  要 I

Abstract II

目录 III

图清单 IV

表清单 IV

1绪论 1

1。1课题研究的背景和意义 1

1。2相关研究和进展 1

1。3 PLC简介 2

1。4课题研究的主要工作 2

2 闭环调速系统的硬件选型 3

2。1 PLC的特性及选型 3

2。2三相异步电机简介及工作原理 5

2。3变频器的简介及选型 8

2。4 编码器的介绍及测量方法 12

2。5硬件选型总结 13

3 系统硬件与PLC程序设计