本論文旨在研究微型永磁同步電動機驅動系統性能的改善，主要探討狀態估測器設計及其轉軸角/速度估測器的研製。文中，首先針對編碼器解析度不足的問題，藉由狀態估測器的設計，以改善低速控制性能。其次，提出一個新型的轉軸角/速度估測器，藉由偵測電流零點訊號，可估測出轉軸角度及速度。該轉軸角/速度估測器主要係由零點電流偵測及角度補償器組合而成。此外，當電動機操作在低轉速下，電流偵測不易，經由調整定子電流大小，可有效改善轉軸角/速度估測器的低速性能。
文中所研製之系統以數位訊號處理器TMS320F28335為控制核心，分別執行狀態估測器及轉軸角/速度估測的運算，實測結果與理論相符合，說明本文提出之微型永磁同步電動機閉迴控速系統的正確性及可行性。

This thesis investigates performance improvement of micro-permanent magnet synchronous motor drive systems. Two estimators, which include a state estimator and a rotor position/speed estimator, are proposed. First, the state estimator has been designed to improve the low speed performance of a micro permanent magnet synchronous motor drive system due to its low resolution encoder. Next, a novel position/speed estimator has been designed, which can obtain the position/speed by detecting the zero-current crossing signals. The position/speed estimator combines a zero-current signal processor and a phase angle compensator. In addition, by adjusting the stator current, the low speed performance of the position/speed estimator can be effectively improved.
A digital signal processor, TMS320F28335, is used as a control unit to execute the state estimating algorithm and the rotor position/speed estimating algorithm. Experimental results validate the theoretical analysis and show the correctness and feasibility of this thesis.

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