本文探討以混合式方法實現轉軸角度的估測，進一步達成無轉軸偵測元件內藏式永磁同步電動機的閉迴路速度控制。為了達到寬廣的控速範圍，文中使用兩種不同的轉軸角度估測方法，在靜止及低速時，測量零電壓向量產生的電流斜率，並利用電流斜率推導轉軸角度，使得電動機在靜止狀態下能夠順利啟動。在中、高轉速時，則使用延伸型反電動勢法估測轉軸角度，本文所提的方法，可以使驅動系統在0 r/min至3000 r/min間進行速度控制，並且具有良好的響應。
為了改善驅動系統的動態響應，本文提出預測型速度控制器，達成快速的暫態響應、良好的加載能力及優越的追蹤響應。此外，為了避免輸入電流產生飽和，文中亦探討將電流命令的限制條件融入性能指標，改善控制器因限制條件導致系統響應不佳的問題。
本文使用TMS320F28379D數位訊號處理器，並使用三角積分調變的類比/數位轉換器，進行轉軸角/速度的估測及控制法則。實驗結果與理論分析相當吻合，說明本文所提方法的正確性及可行性。

This thesis proposes a hybrid approach to estimate the rotor position for a sensorless IPMSM close-loop speed control system. To achieve a wide adjustable speed range, two different sensorless methods are used. At the standstill and low speed, the current-slope measuring method of the zero voltage vector is used to estimate the rotor position. As a result, the IPMSM starts from standstill smoothly. At the middle and high speed, the extend back-EMF method is used to estimate the rotor position. The proposed method can operate the IPMSM drive system at different speeds from 0 r/min to 3000 r/min with good responses.
To improve the dynamic responses of the proposed drive system, a predictive speed-loop controller is proposed to achieve fast transient responses, good load disturbance responses, and good tracking responses. In addition, to avoid the saturation of the input current, this paper also discusses the limitation of current input into the performance index to improve the poor response due to the controller’s constraints.
A digital signal processor, TMS320F28379D with delta-sigma A/D converters are used as a control center to execute the rotor position/speed estimation algorithm and the control algorithm. Experimental results can validate the theoretical analysis to show the correctness and feasibility of this proposed method in the thesis.

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