臺灣博碩士論文加值系統

鼠籠式感應電動機因其結構簡單、價格便宜與耐受環境力強，故廣泛用於各領域；然而，由於其複雜的動態數學模式，使得一些基本場導向控制特性並未為吾人所充分瞭解，因此本論文首先即導演鼠籠式感應電動機之廣義間接磁場導向控制(General flux oriented control, GFOC)之動態模式與所需滿足之限制條件，其特點是目前文獻上之轉、定子磁場導向控制及氣隙磁場導向控制均為廣義磁場導向控制法之特例。易言之，此舉甚方便統合現有各種場導向控制策略，甚至開發新型導向控制策略。本論文之第一貢獻便是導演吾人所熟悉之轉子磁場導向控制其四象限運作區之最大轉矩解析式。雖然第一、三及第二、四象限之轉矩曲線仍見其對稱性，但若考慮定子電阻Rs時，則第一、四或二、三象限之弱磁區轉矩曲線並不對稱，若忽略Rs時，會高估第一象限弱磁區之最大轉矩，而低估第四象限弱磁區之最大轉矩，故在高轉速區若欲獲得最快速響應，則需考慮Rs。本論文之第二貢獻便是進一步探討及分析廣義磁場導向控制之穩態特性。結果發現不論廣義磁場導向控制或各種場導向控制在定轉矩區其最大轉矩、滑差頻率與銅損均完全相同。此外，就各種磁交鏈大小而言，傳統各式場導向控制均發生在接近其磁交鏈特性曲線之谷底，此意謂可獲得較低的鐵損。本論文之第三貢獻即為了方便未來整合有關廣義磁場導向控制在弱磁區最大轉矩之研析，故提出一廣義感應電動機阻抗，甚方便將有關電壓限制的條件精確地映射至電流平面上。

Squirrel-cage induction motors, due to their simple structure, cheaper cost and ruggedness, have been widely used in various applications. However, due to the complex dynamic model, the corresponding field oriented control characteristics are not well grasped by general engineers. Hence, in this thesis, a general flux oriented control is first proposed to unify the existing field oriented controls for easy understanding the principle. In other words, the existing field oriented controls become special cases of the proposed general flux oriented control. Also, new flux oriented controls can be derived from the proposed general control.
In addition, contributions of this thesis can be summarized as follows. First, accurate theoretical maximum torque of the familiar rotor flux oriented control is derived. It is found that if the stator resistance is neglected as usually done in the literature, then the corresponding maximum torque may either be over estimated or under estimated in the field weakening region. Second, detailed steady state characteristics of the proposed general flux oriented control are analyzed. It is interesting to see that, in spite of different choices of the parameters, the maximum torque in the constant torque region, and the corresponding slip as well as copper loss are identical. Moreover, the flux linkage magnitude of the existing field oriented controls happen to be located near the local minimum which implies the resulting core loss will also be smaller. Finally, due to limitation of time, a general equivalent impedance expression is derived for the general flux oriented control for convenient transforming the voltage constraint into corresponding current constraint such that the accurate maximum torque in the field weakening region can be explored in the future.

第一章 緒論...1
1.1研究動機...1
1.2文獻回顧...2
1.3 本論文之貢獻...3
1.4 本論文之內容概述...4
第二章 廣義磁場導向控制原理...5
2.1 前言...5
2.2 感應電動機之動態模型...5
2.3 廣義磁場導向控制原理...17
2.4 穩態下廣義磁場控制之特例說明...24
第三章 轉子磁場導向控制下之最大電磁轉矩...37
3.1 前言...37
3.2 定轉矩區之最大轉矩導演與例子說明...37
3.3 第一弱磁區之最大轉矩導演與例子說明...44
3.4 第二弱磁區之最大轉矩導演與例子說明...54
第四章 廣義磁場導向控制與最大轉矩對速度曲線在四象限之 不對稱現象分析...70
4.1 前言...70
4.2 廣義磁場導向控制定轉矩區之最大轉矩導演...70
4.3 最大轉矩曲現在四象限之不對稱現象分析...88
第五章 結論...104
參考文獻 …106
附錄...110

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