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.

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