本文擬研製ㄧ以數位信號處理器為基礎之三相感應電動機滑動模式轉速控制系統。首先將三相感應電動機之數學模式，經由座標軸轉換關係推導出以同步旋轉座標為參考座標之數學模式，再根據間接式轉子磁場導向控制法達到解耦合。由電壓空間向量脈波寬度調變輸出可變頻率及可變電壓之三相交流電源驅動三相感應電動機。為了克服感應電動機機械參數變化及負載干擾對控制響應的影響，轉速控制採用滑動模式控制器取代傳統比例-積分控制器，以提高轉速控制系統之響應及負載變動之適應性。
本文採用數位信號處理器為整體系統之控制核心，實際應用於 600 W 之三相感應電動機轉速控制系統。由實驗結果顯示，本論文所推導之滑動模式控制法則，具有良好轉速控制響應且能有效克服負載干擾之強健性。

The objective of this thesis is to develop a DSP-based sliding-mode controller for induction motor speed control system. The mathematical model of induction motor in synchronously rotating reference frame is derived from the three-phase circuit via the coordinate transformation. According to indirect field-oriented vector control method, the thesis achieves decoupling of the motor torque and rotor flux amplitude. The variable voltage and frequency of three-phase power source based on voltage space vector pulse-width modulation drives induction motor. Due to the fact that the variations of mechanical parameter and load disturbances affect the control responses, sliding mode controller instead of conventional PI-controller enhancing the response of speed control system and adaptation of load disturbance is proposed.
Finially, an experimental system is actually implemented in three-phase induction motor of 600 W using digital signal processor as the core of the speed control system. Experimental results confirm that the sliding mode control rule yield not only better response in speed but also superior robustness in external load disturbances.

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