Comparison of Spoke-Type Motor with Classical and Advanced Ferrite Magnets

Over the past decades, the performance of ferrite magnets has been significantly improved, which causes an increasing interest in using ferrite magnets for high power density motor applications. This paper compares two different ferrite magnet grades in a spoke-type permanent-magnet synchronous machine (PMSM) concerning machine performance, which includes output torque, irreversible demagnetization resistance, and efficiency using the finite element method (FEM). The results of this analysis show that the machine with advanced ferrite magnets provides larger output torque and higher demagnetization resistance at low temperature, which make the usage of the machine with ferrite magnets in the traction application, such as electric vehicle (EV), more attractive.