感應馬達之轉子磁場導向控制理論發表至今已有三十多年，其最大的好處是可以獲得瞬時轉矩響應，而達到如同他激式直流伺服馬達之快速動態響應；然而馬達運轉過程中容易受溫度上升影響而產生參數漂移的現象，若能以常數取代轉子磁通鏈中的互感與轉子電感，即可降低對環境變化的敏感度，此外如何兼顧獲得最大之轉矩，則仍有改進的空間，本論文即基於上述考慮以提出一感應馬達廣義磁場導向最大轉矩控制策略，俾進一步改善傳統場導向控制方法，並獲得更佳之動態性能。
本論文主要貢獻可分為下列四點：首先，在第二章提出一感應馬達廣義磁場導向控制法則，此控制法則可以避免馬達運轉中受到參數漂移的影響，降低敏感度；其次，在廣義磁場導向控制的條件下，推導出感應馬達各轉速區段受電壓或電流限制之最大轉矩與其對應之滑差頻率曲線，然後進一步求得一符合廣義磁場導向之最大轉矩控制策略；此新控制策略不僅有廣義磁場導向控制之優點，亦同時可獲得最大之輸出轉矩；第三點貢獻是配合本文之新型控制策略，提出一柔性且安全的啟動控制策略。最後在硬體實作方面，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，以驗證本論文所提新型控制策略之有效性。

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, temperature variety will cause motor parameters drift and degrade the performance. It is hoped that this can be improved by replacing the parameters of flux linkage with constants. 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 generalized flux oriented maximum torque control strategy for the induction motor drives.

Major contributions of this thesis may be summarized as follows. First, a generalized flux oriented control model is derived in chapter 2 and the model can overcome the effect of motor parameters drifting. Second, analytic expressions of the corresponding slip angular frequency and the maximum torque are also derived. Based on the previous results, a generalized flux oriented maximum torque control strategy is then presented to further increase the dynamic response speed. Third, a soft and safe starting control strategy 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 generalized flux oriented maximum torque control strategy by using a digital signal processor, namely TMS320F2812. Both simulation and experimental results verify the validity of the proposed control strategy.

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