Rotor MMF Harmonic Analysis of Brushless Doubly-FED Machine
Abstract：The brushless doubly-fed machine (BDFM)is a new type of induction machine, with good application prospects。It combined the merits of the asynchronous motor with the squirrel-cage rotor with and wound-rotor and the electro-excited synchronous motor．It is very suitable for driving windmills or water pumps toperform speed-adjusting and energy-saving operation．In this paper, the operational principle of BDFM is analyzed in detail and the equations of the rotor speed，power and rotor frequency ale derived ．After the harmonic analysis，the approach to decrease higher harmonic is presented by changing numbers of each stator windings and adjusting the distributions of rotor bars．The front of tow chapters of the article are introducing the background and significance of the BDFM researching and the theory of the rotor winding of the BDFM ;Finally, the theory an d method of electromagnetic design for BDFM ale discussed in detail with examples．then the article would establish the harmonic magnetic force mathematical model of the squirrel-cage rotor, also use MATLAB compile the account proceeding ;finally the article would separate to analysis The Rotor MMF Harmonic of the and the .
Key words：Brushless doubly-fed machine；Operational principle；
Rotor winding ；Harmonic analysis；
目录
摘要…………………………………………………………………………………………..I
Abstract………………………………………………………………………………………Ⅱ
主要符号…………………………………………………………………………………….Ⅲ
第1章 无刷双馈电机研究的背景和意义…………………………………………………1
1.1 前言………………………………………………………………………………...1
1.2 无刷双馈电机的发展及研究现状…………………… …………………………..2
1.3 无刷双馈电机的研究意义………………………………………………………...3
第2章 无刷双馈电机绕组的原理……………………………………………………...5
2.1定子绕组的结构………………………………………………………………...5
2.2转子绕组的结构………………………………………………………………...7
2.2.1 笼型转子结………………………………………………………………….7
2.2.2 绕线型转子结构…………………………………………………………….8
2.2.3 磁阻型转子结构…………………………………………………………….9
第3章 倍极比绕线型转子的设计 …………………………………………………...11
3.1槽号相位图的画法……………………………………………………………..11
3.2 变极绕线转子接线原理及方式…………………………………………………12
3.3 用“对称轴法”实现单绕组变极……………………………………………….13
3.3.1 变极步骤……………………………………………………………………13
3.3.2 换相法变极…………………………………………………………………14
3.3.3 一种变极绕组方案图………………………………………………………15
第4章 建立转子绕组谐波磁势计算模型…………………………………………….17
4.1交流绕组磁势理论……………………………………………………………….17
4.1.1“安导波”的概念及其与磁势的关系…………………………………17
4.1.2 单根导体的磁势计算……………………………………………………...18
4.1.3 单个线圈的磁势计算…………………………………………………..21
4.1.4 线圈组的磁势计算……………………………………………………..23
4.1.5 相绕组的磁势计算……………………………………………………..24
4.2 整个笼型绕组的各次谐波计算……………………………………………...25
4.2.1 笼型转子单个线圈的磁动势分析计算…………………………………...25
4.2.2 笼型转子线圈组的磁动势分析计算……………………………………...26
4.2.3 总个磁势的计算…………………………………………………………...27
4.3 整个绕线型绕组的各次谐波计算…………………………………………...28
4.3.1 分析绕组方案的绕组系数………………………………………………...28
4.3.1 p=1对极的具体磁势计算………………………………………………..30
4.3.2 p=5对极的具体磁势计算………………………………………………..33
第5章 用MATLAB编写谐波磁势的通用计算程序………………………………..37
5.1 MATLAB简介及其发展历史………………………………………………...37
5.2用MATLAB语言对转子谐波磁势进行编程………………………………..38
5.2.1磁势计算程序的流程图…………………………………………………...38
5.2.2同时对两种转子磁势计算进行编程……………………………………...39
第6章 绕线型转子磁势的分析研究………………………………………………….45
6.1转子绕组参数的选取…………… .…………………………………………...45
6.2程序的运行以及结果………………………………………………………….45
6.3结果分析……………………………………………………………………….53
第7章 笼型和绕线型转子磁势的对比分析研究……………………………………54
7.1各转子绕组参数的选取………………………………………………………54
7.2程序的运行以及结果…………………………………………………………54
7.3 对比分析5/1对极36槽特殊笼型转子及绕线型转子磁势…………………...65
结束语……………………………………………………………………………………69
参考文献…………………………………………………………………………………70
致谢…. ……………………………………………………………………………………..71
