摘要随着人们生活质量的普遍提高以及科学技术的不断进步，中央空调也逐渐进入了人们的视野，成为人们生活中重要的一部分，同时它所消耗的能量也引起了社会的关注，中央空调的节能问题成为了人们期待解决的关键问题。69183

中央空调采用的变频技术从一定程度上极大地减少了能量的损耗，采用变频调速后，一方面成功的实现了电动机的软启动，在另一方面也减弱了振动和磨损，增长了电动机的寿命。中央空调水泵变频技术是中央空调节能降耗的一个有效途径，而且也得到国家政策的支持，代表了今后空调行业节能技改的方向。

这次所做的方案主要就是通过西门子S7-200系列的CPU226 作为控制元件来研究并且设计中央空调水泵变频调速控制系统。该设计论文将会叙述变频器和可编程控制器的工作原理，完成变频器、可编程控制器等的选型和参数设置，重点完成PLC硬件电路图和程序设计。

中央空调水泵变频调速控制系统的经济性十分可观，将会具有很好的前景和开阔的市场。

该论文有图43幅，表1个，参考文献31篇。

毕业论文关键词：中央空调  变频调速  可编程控制器

Central Air conditioning’s Water Pump Frequency Control of Motor Speed Control System Design Based on PLC

Abstract

With the continuous progress in science and technology and improvement of the quality of life, the central air conditioning has gradually entered the people's vision, which has become an important part of people’s life . At the same time ,the energy it consumes also caused concern in the community.The energy saving problem of central air-conditioning has become the key problem that people expect to solve .

Central air-conditioning system which is based on variable frequency technology in a certain extent greatly can reduce energy consumption., It adopts speed-adjusted system through frequency conversion ,which on the one hand brings the success of the motor soft start,and on the other hand which also reduce the vibration and abrasion and prolongs the life of the motor. Central air-conditioning pump variable frequency technology is an effective way to save energy.Moreover，it has get the support of national policy and it has been on behalf of the future direction of energy-saving air-conditioning industry technical.

This graduation design is mainly designed by Siemens S7-200 cpu226 which is used to control element for the research and design of central air conditioning water pump frequency control of motor speed control system. The design in this thesis will explains the principle ,model selection and parameter design of the converter and the programmable controller.The design will focus on the completion of PLC hardware circuit diagram and program design.

The economy of the central air conditioning water pump frequency conversion speed control system is very considerable which will have a very good prospect and open market.

Key Words:Central Air Conditioning  Variable Frequency Speed Control   Programmable Controller

目   录

摘   要 I

Abstract II

目   录 III

图清单 V

表清单 VI

1绪论 1

1.1设计中央空调变频调速系统的意义 1

1.2 变频调速技术的简单介绍 1

1.3 本文的主要工作 2

1.4 本章小结