Comprehensive Analysis of Dual-Rotor Yokeless Axial-Flux Motor with Surface-Mounted and Halbach Permanent Magnet Array for Urban Air Mobility

Do-Kwan Hong (), Jang-Hyun Park and Yeon-Ho Jeong
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Do-Kwan Hong: Electric Machine and Drive System Research Center, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea
Jang-Hyun Park: Electric Machine and Drive System Research Center, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea
Yeon-Ho Jeong: Electric Machine and Drive System Research Center, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea

Energies, 2023, vol. 17, issue 1, 1-15

Abstract: A dual-rotor yokeless and segmented armature (YASA)-type axial-flux permanent magnet (AFPM) motor with a surface-mounted permanent magnet (SPM) array type was developed for urban air mobility (UAM) aircraft in this work. The proposed AFPM motor had rated and peak output powers of 75.5 and 104 kW, respectively, with rated and peak rotational speeds of 1800 rpm. To achieve a high torque, a cobalt–iron alloy core material was used for the stator core. The prototype AFPM motor, developed by KSEP in the Republic of Korea, was successfully manufactured and verified through experimentation. Additionally, the thermal stability of the winding and permanent magnets (PMs) was confirmed with a water-cooling system. A structure analysis of the proposed AFPM motor was conducted due to the detachment of an uneven air-gap length in the prototype AFPM motor. An output performance comparison based on core materials for the stator and rotor was carried out to explore the material cost reduction. Subsequently, the design for performance improvement by applying a Halbach permanent magnet (HPM) array type was investigated for further research.

Keywords: axial-flux permanent magnet motor; cobalt–iron alloy core; Halbach permanent magnet array; urban air mobility (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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