交流电机调速毕业的设计.doc

摘 要 最近几年，随着新型电力电子器件的不断涌现和计算机技术的飞速发展，高性能的交流电动机变频调速系统得到了广泛的应用，它的显著的节能效果和灵活的运行方式，给人们留下了深刻的印象。 本论文首先论述了变频调速的基础技术，简述了它在我国的发展和应用以及今后在这方面应做的工作；其次对系统的主电路、控制电路、电气控制电路以及实现控制的软、硬件进行了系统地分析，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-交型电路形式，并采用IGBT作为主电路的功率开关器件；根据SPWM波形的生成原理，从硬件和软件上探讨了基于MA818，用于IGBT控制的数字化PWM波形产生器的实现方法；根据系统的设计要求，选择了转速负反馈控制，提高了系统的精度和稳定度；最后完成了相应的电气控制电路。 经相关的实验及仿真波形分析，表明该系统满足预期的设计要求。 关键词： 交流调速 变频调速 IGBT SPWM MA818 Abstract Recently several years, along with the new electric power electronic device unceasing emergence and the computer technology rapid development, the high performance exchange electrically operated adaptable frequency modulation fast system obtained the widespread application, his remarkable energy conservation effect and the nimble movement way, have made the profound impression to the people First, the basic technique of speed control by frequency variation is introduced briefly , and then the development and application in our country is summarized and we should do in future; Second, the main circuit、control circuit、electrical control circuit and software and hardware of the control device is analyzed systematically. Based on the foregoing analyses, AC—DC—AC voltage source inverter( VSI ) and IGBT devices are selected in the main circuit . According to the SPWM profile production principle, has discussed from the hardware and the software based on MA818, uses in IGBT the control the digitized PWM profile producer realization method; According to the system design request, has chosen the rotational speed negative feedback control, increased the system precision and the stability; Finally has completed the corresponding electricity control circuit . It is proved by design experiments and simulation waves that this design accords with the expectable requirements. Keywords：AC speed - adjusting； Variance-frequency speed - adjusting；IGBT；SPWM；MA818 第一章 前言.......................................