《普通车床的主轴调速》-毕业论文.doc

PAGE 普通车床的主轴调速 摘 要：随着科学技术的不断发展，机床的电气控制装置亦不断更新。在控制方法上，其发展过程主要是从手动到自动；在控制功能上，是从简单到复杂；而在操作上，是由笨重到轻巧。生产工艺上不断提出新要求，是促使电气控制技术发展的动力，而新型电器、电子器件的出现，又为电气控制技术的发展开拓了新的途径。 本设计的框图，是PWM逆变器转差频率控制系统。此系统主要使用双闭环系统进行控制，电流环和转速环，主电路采用的是 交——直——交变频器电压源型。 本论文详细的讲述了主电路每个环节，整流部分是第一个环节，在整流环节用的是可控整流还是不可控整流，以及它们各自的优点和不足，其中可控整流重点讲述，并对晶闸管的关断及导通条件进行了讲解，逆变部分是第二个环节，在逆变环节中主要讲解了逆变的分类，以及IGBT的工作原理、基本特性和用EXB841的优化版来驱动IGBT。并对调速系统的实施方案进行了论证。在此基础上，调速系统主电路采用了交—直—交变频器调压调速的形式，用的是电容进行滤波及用的是电压源型逆变器。 关键词：双闭环、整流、逆变、IGBT Abstract: With the continuous development of science and technology, machine tools, electrical control devices are also constantly updated. Control methods, the process of its development, mainly from manual to automatic; in the control of functions, from simple to complex; while in operation, is heavy to light. Production technology have made new demands, is to promote the development of electric power control technology, and new electrical appliances, the emergence of electronic devices, electrical control technology for the development of new avenues opened up. Diagram of this design is the PWM inverter slip frequency control system. This system is mainly carried out using a dual closed-loop system control, current loop and speed loop, the main circuit is used to pay - directly - cycloconverter voltage source. This paper describes in detail every aspect of the main circuit, rectifier part is the first link, link in the rectifier is controlled by non-controlled rectifier or rectifier, as well as their respective strengths and weaknesses, which focus on the controlled rectifier, and and the turn-off thyristor turn-on conditions, the inverter is the second link in part, the main link in the inverter on the classification of the Inverter, as well as the working principle of IGBT, the basic characteristics and the optimal use of EXB841 version to drive the IGBT. Speed control system and the implementation of the demonstration program. On this basis, the main circuit of speed control syst