毕业的设计变频电动机的设计.doc

毕 业 设 计 题 目： 4极变频电动机设计 系： 电气与信息工程系 专业： 电气工程及其自动化 班级： 学号： 变频电动机的研究 摘 要： 本文介绍了变频调速三相异步电动机的电磁设计特点和结构特点，在设计时充分考虑变频器输出电压和电流中所包含一系列的高次谐波给电机性能带来的不利影响，这包括对电机的额定电流、功率因数、损耗及效率的影响，并且实例计算了其影响的程度。这都为变频调速三相异步电动机的工程设计提供了有力的设计依据。目前，在各大钢铁行业上的主轧机，卷取机及开卷机当中的主拖动电机，几乎全部选用了变频调速电动机。变频调速电动机对电机的各项指标要求都较高，本文通过对一台7.5kW低压变频电动机的设计，分析了变频调速电动机的电磁设计特点和结构设计特点，分析了如何选取额定点，如何选取电机的参数来满足机械负载的要求，这对变频电机的工程设计具有一定的参考价值。 关键词: 三相感应电机；变频调速；设计 The reserch of Variable-Frequency Motors Abstract：In this paper the design and structure characteristics of variable-frequency adjustable-speed three-phase induction motors are introduced. During the design process some unfavorable influence on the performance of motor is fully considered ，such as higher harmonic in the output voltage and current caused by inverter. The influences on rated current, power factor, loss and efficiency are included. Then theextent of such influences is calculated by means of experiments. All of these provide solid basis for engineering design of variable--frequency adjustable-speed three-phase induction motors. At present, the primary driving motors of main rolling machines, curling machines and decoilers in steeliron industries are mostly variable-frequency adjustable-speed motors. Correspondingly the qualifications of these motors are much stricter. In this paper, we analyzed the electromagnetic and structure design characteristics of a 7.5kW low-voltage variable-frequency motor. During this process problems such as how to select the rated points and how to select parameters of the motor in order to meet the requirements of mechanical load are introduced in detail. All of these give references to engineering design of variable-frequency motor. Key words: three-phase induction motors; Variable-frequency adjustable-speed; design 第1章 绪论 1.1 交流调速技术发展的概况及国内外现状 随着生产技术的不断发展，直流拖动的薄弱环节逐步显示出来，由于换向器的存在，使直流电动机的维护工作量加大，单机容量，最高转速以及使用环境都受到限制，人