Cascaded H Bridge Based MLI Fed Six Phase Induction Motor Drive for High Power Applications

Abstract

The present research work embodies high power variable speed drives using a sixphase induction machine. This is due to the potential benefits of a six-phase machine, newlinewhich mainly include high torque density, higher reliability, enhanced modularity, newlineand greater efficiency over its three-phase counterpart. Furthermore, when combined newlinewith a Multilevel Inverter (MLI), a six-phase machine results in a new arrangement of newlinepower segmentation due to its flexible structure. As a result, it increases the power newlinelevels and provides a higher degree of operational freedom. The six-phase machine newlinepossesses two sets of three-phase winding sharing the same magnetic circuit having newlinesymmetrical or unsymmetrical spatial phase separation. When fed through a Voltage newlineSource Inverter (VSI), it reduces per phase current without change in voltage per newlinephase but introduces harmonics into the system. Therefore, a multilevel inverter fed newlinesix-phase induction motor (SPIM) drive is recognized as a viable solution for newlineovercoming such harmonics problems. newline