A Review of Axial Flux Permanent Magnet Machine Technology

Axial flux permanent magnet machines (AFPM) are popular for applications that benefit from high torque density and an axially compact form factor, such as in-wheel traction drives. Although the radial flux permanent magnet machine (RFPM) and the AFPM work based on the same underlying principle, the...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2023-07, Vol.59 (4), p.1-14
Main Authors: Nishanth, FNU, Van Verdeghem, Joachim, Severson, Eric L.
Format: Article
Language:English
Subjects:
analysis
axial flux machine fabrication
axial flux machine sizing
Axial flux machines
bearingless machines
combined radial-axial flux machines
commercial axial flux machines
Design optimization
electric machine thermal management
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
fabrication
flux weakening
Form factors
Loading
Magnetic flux
magnetically geared machines
Mathematical models
optimization
Permanent magnets
PM machines
Rotors
shear stress
speed-power capability
Stator windings
thermal management
Three-dimensional displays
Torque
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Description
Summary:Axial flux permanent magnet machines (AFPM) are popular for applications that benefit from high torque density and an axially compact form factor, such as in-wheel traction drives. Although the radial flux permanent magnet machine (RFPM) and the AFPM work based on the same underlying principle, the differences in their geometry introduce complexities in analysis of the AFPM. In this paper, the different AFPM design variants, their sizing approaches, computationally efficient design optimization techniques, and manufacturing techniques reported in literature are reviewed. In addition to classical AFPM machines, emerging variants and research opportunities with potential to push the boundaries of electric machine technology are reviewed. These include bearingless AFPMs, magnetically geared AFPMs, and combined radial-axial flux machines.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2023.3258933