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Evolution and comparison of three typical permanent magnet machines for all-electric aircraft propulsion

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Abstract

In this paper, three typical permanent magnet machines for All-Electric aircraft propulsion are designed, optimized and compared. Firstly, the necessary performances are determined based on the requirements of high power/torque density and an aircraft with a maximum takeoff weight of 1500 kg. The initial structures of interior permanent magnet (IPM) synchronous machine, vernier permanent magnet (VPM) machine and flux-switching permanent magnet (FSPM) machine are designed with identical stator outer radius and rotor shaft length. Then, parametric sensitivity analysis and multi-objective particle swarm are combined as an optimization methodology to optimize these machines. Based on the finite element analysis, the electromagnetic performances such as no-load airgap flux density harmonic spectrum, cogging torque, average output torque, losses, efficiency and power factor, etc., are generally compared and analyzed. Subsequently, the discussions are carried out, where the strength and weakness of these three machines are concluded and the future prospects are suggested. Finally, it is concluded that if effective measures are implemented to reduce the permanent magnet eddy current loss and improve the power factor, the VPM machine would be the most suitable choice among these machines for All-Electric aircraft propulsion.

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Abbreviations

3D:

Three dimensions

FEA:

Finite element analysis

FFT:

Fast fourier transform

FSPM:

Flux-switching permanent magnet

IPM:

Interior permanent magnet

MOPSO:

Multi-objective particle swarm optimization

PM:

Permanent magnet

VPM:

Vernier permanent magnet

α PM :

Angle of PM [deg]

α v :

Angle of V-shaped PM [deg]

f 1, f 2, f 3 :

Magnetic field path 1, 2, 3 of FSPM machine

f v 1, f v 2 :

Magnetic field path 1, 2 of VPM machine

g :

Airgap length [mm]

h os :

Height of flux barrier [mm]

h PM :

Height of PM [mm]

h rh :

Height of rotor hollow [mm]

h rt :

Height of rotor tooth [mm]

h s :

Height of stator slot [mm]

h y :

Height of stator yoke [mm]

l b :

Length of flux bridge [mm]

l r :

Length of rotor stack [mm]

M PM :

PM mass [kg]

R ri :

Inner rotor radius [mm]

R ro :

Outer rotor radius [mm]

R so :

Outer stator radius [mm]

V PM :

PM volume [cm3]

w Fe :

Width of ferromagnetic rib [deg]

w msc :

Width of modular stator gap [mm]

w os :

Width of flux barrier [deg]

w PM :

Width of PM [mm]

w q :

Width of magnetic bridge [deg]

w r :

Width of rotor yoke [deg]

w rh :

Width of rotor hollow [deg]

w rt :

Width of rotor tooth [deg]

w s :

Width of stator slot [deg]

w T :

Width of stator tooth [deg]

w v :

Interval width of PM [deg]

k α v, k lb :

Coefficient of Variation of αv, lb

k hos, k hPM, k hr, k hst :

Coefficient of variation of hos, hPM, hr, hst

k wFe, k wmsc, k wos :

Coefficient of variation of wFe, wmsc, wos

k wPM, k wq, k wr :

Coefficient of variation of wPM, wq, wr

k wrt, k ws, k wT :

Coefficient of variation of wrt, ws, wT

THD :

Total harmonic distortion

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Funding

Science and Technology Innovation Program of Hunan Province, 2023JJ40156, Laboratory of Science and Technology on Integrated Logistics Support of National University Defense Technology, WDZC20235250308.

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Dingbang Long and Honghui Wen wrote the main manuscript text and Yulong Shao prepared figures 5-6. All authors reviewed the manuscript.

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Correspondence to Honghui Wen.

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Long, D., Wen, H., Shao, Y. et al. Evolution and comparison of three typical permanent magnet machines for all-electric aircraft propulsion. Electr Eng 106, 2219–2231 (2024). https://doi.org/10.1007/s00202-023-02023-x

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