Hybrid-Type PM Motor for Electric Vehicle Traction with improved Reluctance Torque

This paper proposes a novel hybrid-type permanent magnet motor (HPMM) that simultaneously applies ferrite-PM (Fe-PM) to reduce the amount of NdFeB (Nd-PM) used in electric vehicle traction motors. Conventional HPMM can be divided into parallel type (P-HPMM) and series (S-HPMM). P-HPMM is advantageous for PM torque improvement because it obtain high flux linkage, but there problem Fe-PM demagnetized due strong magnetic Nd-PM. S-HPMM way fundamentally solve these problems. However, difficult improve linkage compared P-HPMM. Therefore, this paper, rotor topology effectively generate reluctance by improving proposed. The target 2018 NISSAN LEAFTM motor. proposed has same density as motor, while reducing Nd-PM usage 38%.