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

This paper presents the simulation and experimental results of a 42 V 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 90 W, 14 V, 50 Hz, 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 dq0 components.