无刷直流电机双闭环控制

江苏科技大学

15届毕业设计（论文）

无刷直流电机的双闭环控制设计

系部：自动化

专业名称：电气工程及其自动化

班级：11403041

学号：1140602116

作者: 龚昊

指导教师: 王伟然

年月日

无刷直流电机的双闭环控制设计

The design of double closed loop control of the brushless DC

motor

江苏科技大学

毕业设计（论文）任务书学院名称：电子信息学院专业：电气工程及其自动化

学生姓名：龚昊学号：1140602116 指导教师：王伟然职称：讲师

摘要

由于电子技术，计算机技术，传感器技术，电力电子技术，现代控制理论和新型永磁材料的发展，永磁无刷直流电动机及其控制技术已有突破性进展。近20年来，永磁无刷直流电机因其结构简单，调速性能好，控制方法灵活多变，效率较高，起动转矩大，运行寿命长等优点，日趋广泛应用于航空航天，计算机，军事，汽车，工业和家用电器等领域。

本文针对无刷直流电动机选取双闭环控制技术进行调速。首先，介绍了无刷直流电机的特点及其结构和原理；其次，建立了无刷直流电机的模型，进行数学分析；再次，采用双闭环PI调速，主要针对其PI控制器进行了相关设计与改进，消除无刷直流电机稳态时的静差；最后，基于MATLAB/SIMULINK平台，建立控制系统的仿真模型，对无刷直流电动机速度闭环控制系统进行仿真。

仿真结果显示该模型转矩响应较快，电流脉动较小，电机工作稳定可靠，具有良好的静动态特性。无刷直流电机的双闭环控制采用电流滞环，结构简单、响应快速，具有一定理论与应用意义。

关键词：无刷直流电动机；双闭环控制；数学模型；MATLAB；

Abstract

S ince the development of electronic technology, computer technology, sensor technology, power electronics technology, modern control theory and new permanent magnetic material.Permanent magnet brushless dc motor and its control technology has made a breakthrough.During the past 20 years,since its simple structure,good performance of speed adjustment,variable control methods,high efficiency ,large starting torque and long service life and so on.The brushless dc motor is now increasingly used in fields like aerospace,computer,military,cars,industry and household appliance.

This passage is based on the speed control of the brushless dc motor.Double closed-loop control technology is used for researching and analysising among numerous control methods.At first,it has introduced the research background of the brushless dc motor.Next,based on the working principle of the brushless dc motor,the model of the brushless dc motor has been established to do mathematical analysis. After that,we take double closed loop speed regulation,and mainly design and improve PI regulator to make the brushless dc motor astatic in steady state.At last in order to

make simulation of control system for brushless dc motor speed closed-loop control system,we establish the simulation model of control system which based onMATLAB/SIMULINK platform.

The result of simulation shows that the response of torque is quick and the pulsation of current is small.The motor can work reliable and has good static characteristic.We use current hysteresis band in the control system since its simple structure and quick response,it is based on reliable theory and is meaningful in application.

Keywords:brushless direct current motor;double closed-loop control; mathematical models;MATLAB;

目录

第一章绪论1

1.1无刷直流电动机 (1)

1.1.1无刷直流电机的简介 (1)

1.1.2 无刷直流电机的特点1

1.1.3 无刷直流电机在工业中的地位及应用2

1.1.3.1定速驱动机械 (2)

1.1.3.2调速驱动机械 (3)

1.1.3.3精密控制 (3)

1.2无刷直流电机国内外研究现状 (4)