Analysis of electromagnetic torque of a fifteen-phase induction machine in ten-phase operation mode

Multiphase induction machines can be de-rated operated by removing the set of faulty phases after one phase open circuited. The electromagnetic torque thus can be controlled by regulating the converter output voltage and frequency of the remaining phases. To ensure that the output torque can meet the load requirement, it is necessary to calculate the electromagnetic torque in this special condition. This paper presents the electromagnetic torque calculation for a fifteen-phase induction motor with ten-phase operation using distributed magnetic circuit analysis combined equivalent circuit method. Moreover, the good agreement between calculated result and simulation by finite element method (FEM) shows the validity of the presented analysis.