【作者】 刘明；

【导师】 黄声华；

【作者基本信息】 华中科技大学 ， 电机与电器， 2007， 硕士

【摘要】 电梯作为现代社会重要的交通工具,已得到广泛的应用。随着国民经济的快速发展,小型住宅电梯和家用别墅电梯需求量增长迅猛,这就对电梯的舒适性和可靠性提出了更高的要求。本文在广泛了解各种电梯拖动方式的前提下,重点研究针对异步电动机的电梯变频调速系统。本文详细分析了异步电动机的数学模型,并对变频调速的各种控制策略进行分析和比较。转差频率矢量控制技术是通过有效的坐标变换解除异步电动机的励磁分量和转矩分量的耦合关系,得到如同直流电机的控制特性。本文第三章对这种矢量控制策略进行了分析和仿真研究,并详细阐述了PWM技术,特别对SVPWM技术的具体实现作了详细说明。第四章介绍了系统的硬件电路设计,包括功率部分和控制部分。功率部分包括主电路、电流检测电路、以及驱动和保护电路;控制部分是以主控芯片80C196KB和辅控芯片dsPIC2010为核心的键盘显示电路及转速、电流检测电路。为提高电梯的安全性和可靠性,本章还给出了住宅电梯应对停电事故的应急电源系统的设计思想和方法。为避免对电机参数的依赖,实验样机选定电流反馈跟踪控制策略。基于这种策略,第五章分析了软件设计中的关键技术并给出了主要软件流程。最后,进行了电流开环控制和电流跟踪控制的实验。实验结果说明系统具有良好的动态性能和稳态性能,基本能够满足电梯系统的各项要求。更多还原

【Abstract】 Elevator as an important means of transport has been widely applied in the modern society. With the rapid development of the national economy, the demand of residential elevators grows much more quickly.This kind of elevators should have outstanding performance in stability and reliability. Based on extensive knowledge of the elevator drive systems,the thesis focuses on the study of the asynchronous motor inverter.The thesis analyzes the mathematical model of asynchronous motor and compares various control strategies of inverter.Slip frequency vector control technology relieves the coupling between magnetic current and torque current through effective coordinate transformation,so it can get the same control characteristics as DC motor. Chapter 3 includes simulation studies for vector control strategies and explanation for the PWM technology. Especially, the realization of SVPWM is described in detail.Chapter 4 describes the design of the system hardware, including power part and control part. Power part is made up of the main circuit,the current detection circuit and the drive&protection circuit. Control part adopts 80C196KB as the core chip and dsPIC2010 as the auxiliary chip, including the keyboard&display circuit and speed¤t detection circuit. To enhance the safety and reliability of elevators, this chapter also gives design methods of emergency power supply system to deal with the power cut accident.To avoid dependence on the electrical parameters ,the system selects current feedback tracking strategy. Based on this strategy, Chapter 5 gives the analysis of key technologies and the main software processes.The experiment has realized the current open-loop control and the current tracking control. The results show that the system has good dynamic performance and steady performance which can meet the requirements of residential elevator system.更多还原