Performance of an eleven-phase induction machine under fault conditions

In this paper, an experimental eleven-phase induction machine is simulated when operating at fault conditions using Finite Element (FE) analysis. Two fault cases representing one phase and two phases open are considered. Two optimization techniques are employed to calculate the optimum phase currents under phase(s) loss to maintain the same Magneto-Motive Force (MMF) distribution as with the healthy case. As the Conventional optimization method requires solving complex nonlinear equations, Genetic Algorithm (GA) is proposed to solve this problem. Comparison between the conventional optimization technique and GA is carried out using finite element analysis which simulates the machine flux corresponding to each optimum solution and the output machine torque.