ABSTRACT
In this entry, a simplified modeling and analysis of a nine-phase squirrel cage induction machine for sustainable energy applications was implemented. The machine’s self- and mutual inductances were synthesized from the fundamental components of the turns and winding functions. From the analysis carried out, the equivalent circuits for the machine, including those for the seven zero sequence voltage components, were established. It was discovered that a small imbalance in the supply voltage would lead to the excitation of all seven zero sequence voltage components. This was discovered to be a minus in the use of multiphase induction machines for renewable energy applications despite their many numerous advantages. A solution was, however, proposed to counter this challenge. Other types of asymmetric operations of the machine were also investigated. One particular interesting case of asymmetric operation is the simulation of open stator fault (loss of one stator-phase voltage). The simulation results for this asymmetric operation showed that the machine was able to start and also developed the rated torque. This is a big plus for the use of the machine in one thriving area of sustainable energy application, which is hybrid electric vehicle/all electric vehicle technology. This implies that the electric vehicle will continue to function even when one complete leg of the power electronic converter drive is faulty (lost). The simulation results for the machine analysis are presented.
