Fault-Tolerant Multi-Three-Phase PMSM Machine for Offroad Vehicle Hybridization

Multi phase machines are gaining popularity especially In the field of vehicle electrification, primarily thanks to their fault-tolerant capability with respect to the classical three-phase machine. The present work reports the study of a multi-three-phase machine to be employed in the hybridization of a 5-ton bucket-excavator, in particular to allow the internal combustion engine downsizing. The design of the machine was chosen to satisfy the constraints for the integration into the existing powertrain and to meet the reference trench digging test cycle. Detailed simulation of losses, including the effect of PWM modulation, was performed to obtain the efficiency map. The losses values were also used as an input for the thermal analysis to assess the machine capability of operating in a harsh environment such as the under-the-hood intended application. Then the study focused on the fault operation capability by obtaining the airgap radial force under different fault scenarios.