摘 要本毕设主要讨论计算机对吊车电机速度调节从而使其满足空勾或有负载时匀速提升，下放。文章中对吊车电机的起动，调速，制动等都做了详细的介绍，提出多种调速、制动方法并加以详细的讨论，具体采纳了串级调速和反接制动的方法对电机进行控制。最终达到了使吊车空勾或有负载时的匀速提升，下放、越线停车、过载停车等要求。关键词： 串级调速；反接制动；电机调速 AbstractThe project mainly studies of crane motor speed regulating computer so that the empty hook or load uniform raising and lowering.In the article, the starting of crane motor speed and braking etc are described in detail, and put forward many speed and braking method is discussed in detail, and specific adopted cascade control and reverse connect braking of motor control method.Finally reached that crane load or empty hook the uniform raising and lowering the line, parking, overload parking requirements.Keywords: cascade control；reverse connect braking；motor speed目 录1 绪 论............................................................11.1 课题意义.....................................................12 系统总体设计框图及单片机系统的设计................................22.1 基本设计思路................................................22.2 系统总体设计框图............................................42.3 8051 单片机简介..............................................42.4 单片机系统中所用其他芯片简介.................................83 三相异步电动机...................................................103.1 三相异步电动机机械特性和人为特性...........................103.2 三相异步电动机的各种运转状态...............................133.3 三相异步电动机的起动......................................143.4 电机的调速方法与讨论......................................153.5 制动方法的选择与讨论......................................184 主电路图.........................................................255 结束语........................................
