An effective voltage switching state algorithm for direct torque controlled five-phase induction motor drive to reduce torque ripple

In this paper, an improved DTC scheme for five phase inverter fed induction motor is presented. The work present here aims to the development of conventional DTC to reduce the torque ripple. For this, a multi-band torque hysteresis controller is implemented as a modification in a conventional DTC mathematical model of 5 phase induction machine based on reference frame theory is also discussed in detail. Modification in hysteresis controller gives the optimum utilization of thirty two voltage vectors in five phase inverter which results in reduction in torque ripple at various speed operations. Simulation results are developed in MATLAB/Simulink software.