《无刷直流电动机的转矩调速》-毕业论文.doc

摘 要 无刷直流电机是以电子换相来代替机械换相的直流电机，它保持了直流电机的优良特性，具有较好的启动和调速性能，而且它无需机械换向器，结构简单，可以从根本上克服有刷直流电机易于产生火花的弊病，因此在航天、机器人、数控机床、以及医疗器械、仪器仪表、家用电器等方面得到广泛应用。 但是，无刷直流电机运行中存在的转矩脉动问题对实现精确的位置控制和高性能的速度控制存在较大影响。本文重点研究电机转矩调速技术及其MATLAB仿真。 文章首先介绍了无刷直流电机的工作原理、导通方式，并通过对数学模型的分析建立了无刷直流电机的MATLAB的PID调速系统模型并调用S-函数进行了仿真，验证了模型的可行性。 关键词： 无刷直流电机；转矩调速；MATLAB；PID；S-函数 ABSTRACT Brushless DC motor based on electronic commutation instead of mechanical commutation of DC motor, it maintained the excellent characteristics of DC motor, and has a good performance of starting and rotate-speed adjustment, and it need not mechanical commutation, the structure is simple, can fundamentally overcome a brushed DC motor prone to spark the evils, so in space, the robot, NC machine tools, and medical equipment, instruments and meters, household appliances, etc widely used. But, brushless DC motor problems in the operation of the torque ripple of to achieve precise position control and high-performance speed control exist great influence. This paper mainly studies the brushless DC motor(BLDCM) torque speed controlling technology and its MATLAB simulation. This article first of brushless DC motor working principle, conduction mode of mathematical model, and then through the analysis of brushless DC motor established the MATLAB PID speed regulation system model and simulation, which validated the feasibility of the model. Keywords brushless DC motor(BLDCM);rotate-speed; torque speed- controlling; MATLAB; PID;S-function 目 录 1 绪论………………………………………………………………………………1 1.1 无刷直流电机技术的发展及现状…………………………………………1 1.2 无刷直流电机的技术问题及其解决技术…………………………………3 1.3 论文研究的主要问题………………………………………………………5 2 无刷直流电机的构成及基本工作原理…………………………………………6 2.1 无刷直流电机电路的基本组成环节………………………………………6 2.2 无刷直流电机的导通方式及基本工作原理………………………………7 2.3 本章小结……………………………………………………………………10 3 无刷直流电机的数学模型………………………………………………………11 3.1 无刷直流电机的数学模型及其基本关系式………………………………11 3.2 本章小结……………………………………………………………………14 4 无刷直流电机的仿真模型及其验证……………………………………………15 4.1 仿真软件介绍…………………………………………………