Six-phase induction machine drive model for fault-tolerant operation

Abstract

This paper presents the simulation and experimental results of a 42V fault-tolerant six-phase induction machine (6PIM) with opened stator phases. The 6PIM has symmetrical 60 degrees displacement winding allowing fault-tolerant modes for an electric power steering (EPS) application. A Voltage Source Inverter (VSI) in closed-loop using a vector control feeds its. The 6PIM model is derived from the stator winding distribution on a conductor-by-conductor basis and the geometrical dimensions of the different slots. A case study by simulation and experimental tests on a six-phase squirrel-cage induction machine rating 90W, 14V, 50Hz, 2 poles is described and analyzed to validate the system performance in faulted modes. This paper presents also the torque ripple estimation in degraded mode using the dqO components.