本文以研製無速度感測器之三相感應電動機驅動電路為主要目標，利用數位訊號處理器作為控制核心。控制架構採用間接式轉子磁場導向控制並配合滑模觀測器作為回授轉速觀測，以實現轉速與電流之閉迴路控制。因此在本文中將著重無感測器系統設計，以換流器輸出的電流回授計算出磁通，再經由磁通計算出轉子旋轉速度。並透過滑差轉速的計算與補償後，得出觀測的電動機同步轉速與同步旋轉角度，完成無感測器之閉迴路速度控制。文中所提出的方法，經由模擬軟體建立完整的三相感應電動機模型並確定其可行性後，再以硬體電路進行實際測試，來驗證控制法之可行性，藉以確立無速度感測器之三相感應電動機驅動電路於實際應用之價值。

In this thesis, developing a sensorless three-phase induction motor drive circuit is main purpose. The digital signal processor (DSP) is chosen as the control core. Indirect Rotor Field Oriented Control (IRFOC) and Sliding Mode Observer (SMO) is adopted as the control architecture, and the feedback speed is observed by SMO to achieve closed-loop control of speed and current. Therefore, this thesis will focus on the design of a sensorless system. The design method is that the flux is calculated by the feedback current of the inverter, and then the rotor speed is calculated through the flux and compensated by the slip speed. Finally, The closed-loop sensorless control is completed when the observed synchronous speed and synchronous rotation angle of motor is gotten. The method proposed in the thesis, it is established a three-phase induction motor model through simulation software and determines its feasibility. Then, the hardware circuits is investigated and verified experimentally to verify the feasibility of this method, thereby establishing the value of sensorless three phase induction motor drive in practical application.

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