臺灣博碩士論文加值系統

感應馬達之轉子磁場導向控制理論已發表了三十多年，目前市面上亦已有相關產品銷售；它最大的好處是可以獲得瞬時轉矩響應，而達到如同分激式直流伺服馬達之快速動態響應；然而如何兼顧考慮獲得最大之轉矩，則仍有改進的空間，本論文即基於上述考慮以提出一新型感應馬達轉子磁場導向最大轉矩控制策略，俾進一步獲得更佳之動態性能。
本論文主要貢獻可分為下列五點：首先，在第三章推導出鼠籠式感應馬達穩態運轉模式下之真正最大電磁轉矩解析式，不必像現有文獻必須作一些假設條件；其次，利用驅動感應馬達之反流器最大允許線電流與輸出電壓之限制條件，導出感應馬達各轉速區段之真正最大轉矩與其對應之滑差頻率曲線，然後求得符合轉子磁場導向控制之對應直軸電流控制新策略；此新控制策略不僅具有轉子磁場導向控制之優點，亦同時可獲得最大之轉矩控制以進一步改進其動態響應，此外將該策略利用前述電磁轉矩解析式推導至四象限運作模式，可以避免正反轉矩命令變換時造成直軸定子電流的不連續性，從而獲得快速動態響應；第三點貢獻則為配合本文之新控制策略提出一轉子及定子時間常數之估測方法，可以線上修正因為溫度效應所造成之影響；第四點貢獻是配合本文之新控制策略，提出一柔性啟動控制策略，可以在限定電壓和電流情況下獲得快速與安全啟動之效果。最後在硬體實作方面，並實際建構一全數位化之感應馬達驅動器雛形系統，量測其穩態與暫態性能，以驗證本論文所提控制策略之有效性。

The rotor flux oriented control theory of induction motors has been presented for more than thirty years and there are also related commercial products available in the market. Its main characteristic lies in the instantaneous torque response to achieve as fast dynamic response as a separately excited dc motor drive. However, in spite of the fast torque response, maximization of the resulting torque is still a subject for further improvement. In fact, it is the main motivation of this thesis to propose a new rotor flux oriented maximum torque control strategy for the induction motor drives.
Major contributions of this thesis may be summarized as follows. First, a closed form truly maximum torque analytic expression is derived without neglecting the stator resistance and imposing the constraint such as the rotor flux oriented control condition. Second, a closed form analytic expression of the corresponding slip angular frequency as a function of rotor speed is also derived. Based on the previous results, a new rotor flux oriented maximum torque control strategy is then presented to further increase the dynamic response speed under four-quadrant operation. Third, to reduce the effect of variations of the stator and rotor time constants, an on-line estimation method is proposed to correct the time constants. Fourth, a soft starting control is presented to build up the initial rotor flux to achieve very fast starting response without violating the current and voltage constraints of the inverter. Finally, a prototype is also constructed to implement the proposed control strategy by using a digital signal processor, namely TMS320F2407. Both simulation and experimental results verify the validity of the proposed control strategy.

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 XI
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 2
1.4 本論文之內容概述 3
第二章 傳統轉子磁場導向控制與單位安培最大轉矩
控制之比較 5
2.1 前言 5
2.2 感應馬達之動態模型 5
2.3 傳統RFOC之基本原理與弱磁控制 13
2.4 傳統RFOC與MTPAC之比較 21
第三章 新型感應馬達轉子磁場導向最大轉矩控制 25
3.1 前言 25
3.2 穩態模式下之真正最大電磁轉矩解析式推導 25
3.3 新型最大轉矩控制策略 46
3.4 轉子與定子時間常數估測與校正 52
3.5 啟動控制策略 62
第四章 模擬與實作結果 68
4.1 前言 68
4.2 新型控制策略之模擬結果 68
4.3 實體電路製作 80
4.4 實測結果 86
第五章 結論 101
參考文獻 103
附錄 A DSP程式列表 111
附錄 B 作者與口試委員合影留念 121

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