定子磁通補償的應用，主要是因馬達於低轉速時，轉子磁通變化緩慢，若定子磁通仍操作於定磁通情況下，將使定子磁通無法達到有效控制，進而使馬達輸出之電磁轉矩降低。故當馬達於低轉速運轉時，提出定子磁通量之補償策略，使得馬達在低速時能有效改善輸出電磁轉矩降低的問題。
另外，對於定子電阻因溫升效應而改變問題，本論文針對直接轉矩控制，提出對傳統直接轉矩之磁通計算的改善方法。由於定子電阻會造成反電勢的降低，使得有效輸出轉矩降低，故提出磁通補償的必要性；而馬達參數的變動，使得定子電流產生高頻雜訊，進而導致定子磁通向量於空間位置之估測產生誤差，而選擇錯誤的電壓控制向量，產生轉矩漣波，故傳統的磁通計算中，利用設計低通濾波器於回授路徑上作為補償，可有效消除馬達於低轉速運轉時，因參數變動所造成磁通計算的高頻誤差。

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