Design of a high performance ferrite magnet-assisted synchronous reluctance motor for an electric vehicle

A high performance 55kW (peak) ferrite-based permanent magnet-assisted synchronous reluctance motor has been designed for an electric vehicle application. The design steps are outlined. Ferrite magnets have been chosen over conventional NdFeB due to cost issues. It is shown by finite element analysis that even under peak load conditions the ferrite magnets are safe from irreversible demagnetization. Key performance indicators for the motor are listed for the entire speed range. It is shown that a design of a high power density machine is possible even in the absence of NdFeB magnet.