DTC based position control induction motor a comparison between different strategies

This work is developed within the improvement of the performance of DTC based position control of an induction machine. The paper is devoted to the presentation of a comparison study between three DTC strategies applied in position control of an induction motor: (i) the Takahashi basic strategy using a two-level inverter and considering six sectors, (ii) a strategy based on the Takahashi one using a two-level inverter where twelve sectors have been considered instead of six and (iii) a strategy dedicated to high voltage applications using a three-level inverter and considering twelve sectors. Simulation results have clearly shown that the three DTC strategies offer a high dynamic of the motor position control. However, the first DTC strategy is penalized at low speeds by high torque ripple and by the demagnetization problem. This latter has been completely discarded by the use of the three-level inverter and the associated DTC strategy. On the other hand, the second and the third DTC strategies are relatively more complicated to implement.