AFPM Machines Equipped With Multilayer Magnets

This article investigates the manufacturability and applicability of unified multilayer magnets, comprising two different magnetic materials with distinct characteristics, for use in electrical machines. In particular, the self-produced multilayer magnets are made of compressed NdFeB bonded powders...

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Bibliographic Details
Published in:IEEE transactions on energy conversion Vol. 40; no. 2; pp. 712 - 723
Main Authors: Darmani, Mostafa Ahmadi, Poskovic, Emir, Franchini, Fausto, Ferraris, Luca, Cavagnino, Andrea, Gerada, Chris
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
axial flux machines
bonded magnets
Casting
Composite materials
Configuration management
cost-efficient
FEM simulations
flux weakening
high efficiency
Hybrid composites
hybrid magnets
Magnetic flux
Magnetic materials
Magnetic multilayers
Magnetic separation
Magnets
Manufacturability
Monolayers
Multilayer permanent magnets
Multilayers
Nonhomogeneous media
Permanent magnets
Rotors
Stator windings
synchronous PM machines
Torque
variable flux machines
ISSN:0885-8969, 1558-0059
Online Access:Get full text
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Summary:This article investigates the manufacturability and applicability of unified multilayer magnets, comprising two different magnetic materials with distinct characteristics, for use in electrical machines. In particular, the self-produced multilayer magnets are made of compressed NdFeB bonded powders for the ' strong ' magnet layer and hybrid composite materials for the ' weak ' magnet layer. Various combinations of material for the self-produced permanent magnets are experimentally investigated. Also, the suitability of resultant multilayer bonded magnets to electrical machines is articulated on the basis of finite element simulations. To assess their performance, three axial-flux surface-mounted permanent magnet machines are constructed: one conventional machine with single-layer bonded magnets as the reference, and two machines equipped with multilayer magnets with series and parallel configurations. The performance of the machines are evaluated in terms of the back-EMF, output torque, torque ripple, losses, efficiency, and cost. The findings indicate an appreciable enhancement in flux-weakening operation for the machine equipped with multilayer magnets, but at the expense of lower flux linkage values and nominal torque. Further analyses of the multilayer magnet's trade-offs and potential applications in electrical machines are presented.
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ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2024.3420133