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Characteristics and Optimization of Unequal Thickness Segmented Magnetic Pole Axial Flux Permanent Magnet Hub Motor
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Characteristics and Optimization of Unequal Thickness Segmented Magnetic Pole Axial Flux Permanent Magnet Hub Motor
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Journal Article
Characteristics and Optimization of Unequal Thickness Segmented Magnetic Pole Axial Flux Permanent Magnet Hub Motor
2025
Overview
Axial flux permanent magnet motors (AFPM) are optimal for hub drives in electric vehicles due to their compact size and high power and torque density. However, the surface-mounted pole structure of the AFPM is susceptible to significant eddy current losses, which can result in irreversible demagnetization of the poles. Furthermore, hub motors for electric vehicles require superior electromagnetic performance. In order to comprehensively consider the eddy current losses and the electromagnetic performance of the motors, this paper proposes a novel topology of an unequal thickness segmented magnetic pole axial flux permanent magnet hub motor (UTSMP-AFPM). Firstly, a mathematical model of eddy current loss in the permanent magnet of an axial flux permanent magnet motor is derived theoretically. The mechanism of pole segmentation to reduce eddy current loss in the permanent magnet is analyzed, and an analytical formula for the electromagnetic characteristics of the motor is established. The performance of the motor is further optimized. Subsequently, finite element simulations are conducted to assess the permanent magnet eddy current loss, rotor temperature rise and electromagnetic performance of the proposed motor in comparison to that of the traditional YASA motor. Finally, a prototype is constructed and the proposed structure is validated through experimentation.
Publisher
Springer Nature Singapore,Springer Nature B.V,대한전기학회
Subject
