Abstract
This paper proposes a novel permanent magnet (PM) motor for high torque performance, in which hybrid PM material and asymmetric rotor design are applied. The hybrid PM material is adopted to reduce the consumption of rare-earth PM because ferrite PM is assisted to enhance the torque production. Meanwhile, the rotor structure is designed to be asymmetric by shifting the surface-insert PM (SPM), which is used to improve the torque performance, including average torque and torque ripple. Moreover, the reasons for improvement of the torque performance are explained by evaluation and analysis of the performances of the proposed motor. Compared with SPM motor and V-type motor, the merit of high utilization ratio of rare-earth PM is also confirmed, showing that the proposed motor can offer higher torque density and lower torque ripple simultaneously with less consumption of rare-earth PM.
Highlights
The interior permanent magnet (IPM) motor is extensively applied in electric vehicles due to excellent merits, such as high torque power density, high efficiency, and wide speed range.[1]
With the increasing cost and unpredictable supplement of rare-earth PM, a series of rare-earth PM less or even free motor are researched as candidates, like switched reluctance motor (SRM), synchronous reluctance motor (SynRM) and PM-assisted synchronous reluctance motor (PMASynRM).[2,3,4]
This paper proposes a new PM motor with hybrid PM excitation and asymmetric rotor structure, offering high torque density and low torque ripple
Summary
The interior permanent magnet (IPM) motor is extensively applied in electric vehicles due to excellent merits, such as high torque power density, high efficiency, and wide speed range.[1]. This paper proposes a new PM motor with hybrid PM excitation and asymmetric rotor structure, offering high torque density and low torque ripple.
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