Direct torque control induction motor drives with self-commissioning basedon Taguchi methodology

This paper presents the analysis and design of direct torque control (DTC) induction motor drives with self-commissioning. Neither motor parameters no r controller parameters are known in prior. The self-commissioning process consists of the calculation of motor parameters, including stator resistor, inertia and friction coefficient, as well as the design of controller. The effects of several factors, including test conditions for deriving moto r mechanical parameters and natural frequency for controller design, on the performance of speed response are investigated using Taguchi's method [1], [2] which is widely used in quality engineering to significantly reduce th e number of experiments. Therefore, the presented drive system can not only provide self-commissioning but also dramatically improve the performance o f speed response, which is evaluated using the performance index of root-me an-squared error (RMSE) of speed. Experimental results derived from a PC-ba sed experimental system are presented to fully support the theoretical deve lopment and analysis.