CMC刮板输送机变频软启动器设计.docVIP

摘要 刮板输送机主要用于回采工作面或顺槽等其他场所，具有机身低矮、占空间小；可以水平、垂直弯曲；结构强度高等优点。由于其特殊的结构和所处的恶劣工作环境，刮板输送机迄今为止仍是综采工作面惟一的运输设备. 刮板输送机是一种用刮板链牵引，在槽内运送散料的输送机。各种类型的刮板输送机的主要结构和组成的部件基本是相同的，它由机头、中间部和机尾部等三个部分组成。The scraper conveyor’s main working places are production face，driving face and coal washery etc．It has many merits，for example，because the scraper conveyor’s body is low ,its floor space is small；it Can bend flatly and vertically；its structure strength is high and so on． Conveyor is a scraper chain with traction in the tank conveyor transporting bulk materials. Various types of conveyor structure and composition of the major components is basically the same, it is by the head, middle and tail of the three-part machine. In recent years, AC Motor Frequency Control and related technology research has become a modern electric drive an important subject areas, and with the new power electronic devices and the introduction of the microprocessor and the exchange of theoretical development of motor control, AC frequency converter Technology will also be made tremendous progress. In exchange in the field of Frequency Control, PWM technology as a key technology in the VVVF technology are important in the development of applications, and the constant pressure than the frequency control (U/F = C) is the application of the most common frequency converter A wide range of control. In this paper, scraper conveyor induction motor to object to 80C196MC as a processor, through SPWM AC motor control technology to achieve constant pressure than the frequency control. design The MCU-based Universal Frequency Control System Key Words：MCU；constant U/F；SPWM 目　　录 Abstract II 1 绪论 1 1.1 变频调速的发展 1 1.2刮板输送机简介 2 1.3刮板输送机启动现状以及启动控制要求 4 2 异步电动机变频调速 6 2.1.1三相交流电机的结构 6 2.1.2三相交流电机的工作原理 8 2.1.3交流电机的调速方式 11 2.1.4变频调速系统的U/f控制方式 13 2.2.1 PWM控制技术的基本原理 17 2.2.2正弦脉宽调制(SPWM)控制理论 18 2.2.3异步调制和同步调制 19 3 刮板输送机变频软启动的的硬件设计 21 3.1系统总体设计图 21 3.2主电路 21 3.3电压保护电路 23 3.4电流检测 24 3.5 IGBT驱动电路 25 3.5.1 IGBT对驱动电路的要求 26 3.5.2 EXB841构成的驱动电路 27 3