在工業應用上，感應馬達在轉矩控制的應用場合有許多，如天車、電梯等；在低轉速控制時，因為馬達的輸出轉矩不足，所以實際應用時都要藉助於減速機構，以達到低轉速高扭力的控制，然而減速機構增加了控制機構的成本及複雜性，在於控制的精確度上效能降低；因此本論文針對感應馬達低轉速高扭力的控制，考慮使用感應馬達直接轉矩控制法，此種控制法具有架構簡單、實現容易等優點；但傳統的直接轉矩控制，其所使用的切換向量策略，無法達到低轉速高轉矩的控制性能，所以進一步針對傳統的直接轉矩控制的缺點，提出以直接轉矩控制架構為基礎之低轉速控制策略以及零轉速策略，應用定子電阻自動量測與磁通補償演算法，逐步進行研究，並將設計DSP程式配合驅動器硬體來驗證，將使感應馬達驅動系統適用於低轉速直接驅動之場所，藉以改善傳統感應馬達驅動器低轉速扭力不足之缺點。 This project intends to improve the performance of the induction motor drive system such that induction motor can be used in low-speed high-torque application. Due to the lack of high-generated torque of general induction motor drives in low speed region, some gear mechanisms are used to obtain a high torque/low speed characteristic in induction motor drive system. Therefore this project tries to improve the existing direct torque control methods of induction motors so that the gear mechanisms can be removed from the induction motor drive systems. To improve the existing direct torque control methods, this project will propose a new switching strategy for the moved vector-based direct torque control witch one-line stator resistance estimation and flux compensation algorithm and a zero speed control algorithm . The possibility of this project will be firstly verified by MATLAB software simulations. Then a DSP-based hardware experimental system will be built to test the performance of the proposed control method.
