Extension of the DTC Technique to Multiphase Induction Motor Drives using any Odd Number of Phases

The interest of Direct Torque Control (DTC) methods in conventional three-phase induction motor drives has been stated by the scientific community and the industry in the very recent decades. Multiphase electric drives have also been recently proposed for applications where the highest overall system reliability and power distribution per phase are required, being transportation systems one of these applications. The DTC technique has been extended to the multiphase drive case at a higher computational cost than in the three-phase case, particularly the symmetrical five-phase and asymmetrical six phase induction machines. This paper extends for the first time the use of DTC in n-phase induction machines, being 'n' any odd number higher than three. The strategy for this extension to any n-phase induction machine is presented, and simulation results are provided to illustrate the interest of the proposed technique.