Modified DTC control using fuzzy logic control for dual three phase induction machine with open phases

The aim of this paper is to control a dual three induction motor drives under open phases. The DTC is a variable structure control strategy with simplicity, fast response, and tolerance to motor parameter variation, which provides direct control of stator flux and electromagnetic torque by optimally selecting the inverter states in each sampling period. Conventional DTC of dual three induction motor has the limitations of constant duty ratio for every switching period and high torque and flux ripples. To solve these problems and ameliorate the performances of this control method, a fuzzy logic controller is used instead of the hysteresis torque and flux controller to minimizing the torque and flux ripple. The faulted mode of the six phase induction machine leads to torque oscillations and poor tracking behavior. In this way, this paper presents a new modified fuzzy DTC for dual three phase induction motor under open phase. The performance of the modified fuzzy DTC is evaluated through simulation and it is shown to be superior to the conventional DTC in term of minimization the torque and flux ripple under open phase.