毕业设计（论文）-离心泵电动机电子软启动器设计精选.doc

离心泵电动机电子软启动器设计 摘要 离心泵作为一种液体传输的通用设备，在给水排水及农业工程、液体输送工程、石油及化学工业、航空航天和航海工程、能源和车辆工程等国名经济各个部门都有广泛应用。但作为离心泵的动力源，三相异步电动机启动方式存在局限性。电动机启动时有很大的电流冲击和转矩冲击。电流冲击会造成电网冲击 ，降低电网电能质量。转矩冲击会造成机械应力冲击，使电动机、离心泵和传动机构等的使用寿命缩短甚至损坏等问题。针对电动机的启动问题，本文提出一种以TMS320F240数字信号处理器为控制核心单元的数字式电动机软启动器。该软启动器采用晶闸管调压基本原理，通过改变晶闸管触发角，来实现定子两端的电压调节，实现了异步电动机软启动、软停车及保护等功能。本文同时还详细的阐述了晶闸管软启动器调压和工作原理以及系统硬件结构设计等。本软启动器操作简单、智能化程度高，达到改善电动机的启动性能要求，使电动机能平稳可靠的启动。 关键字：单片机，异步电动机，软启动器，晶闸管，离心泵 The design of electric soft starter ofthree-phases asynchronous electromotor Abstract Centrifugal-pumps are widely applicated in industrial as a common fluid transmission equipment,are widely used in the Water Supply and Drainage and Agricultural Engineering, liquid delivery engineering, oil and chemical industry, aerospace and maritime engineering, energy and vehicle engineering and other countries of various sectors of the economy.But as a power source for centrifugal pump, Three-phase asynchronous motor start-up mode limitations.there is great current and torque impact. Current impact will cause grid impact,and reduce grid power quality .Torque impact will cause the impact of mechanical stress,will cause issues such as reduce the life of the motor, centrifugal pump and the transmission institutions or even damage. To solve Start-up problems of the motor, this article raised a high-performance digital soft start motor at the core of TMS320F240. This soft starter has used the basic principle that exchange voltage,by changing SCRs triggering angle to adjust the voltage of the ends of the stator, hus realized the asynchronous motor voltage pitch to start,soft park, protection and other function. Meanwhile, this article also elaborate describe the knowledge such as the thyristor’s exchange voltage and the soft starter’ principle of work,and the structural design of system hardware. This soft starter operates conveniently and simple, highly intelligent, achieves the requirement to improve the three-phase asynchronous motor’ starting perform