Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine

Matin Vatani; Ali Mohammadi; Donovin Lewis; John F. Eastham; Dan M. Ionel

doi:10.1109/ICRERA59003.2023.10269322

Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine

Matin Vatani, Ali Mohammadi, Donovin Lewis, John F. Eastham, Dan M. Ionel

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

4 Scopus citations

Abstract

This paper proposes a concept for a coreless axial flux permanent magnet (CAFPM) generator with a double-sided Halbach array rotor for direct-drive offshore wind turbine applications. The application of printed circuit board (PCB) technology is explored as applied to a concentrated winding stator due to its high reliability, repeatability, and fast mass production. A double-sided Halbach array rotor is employed to intensify the airgap flux density and to enable the elimination of the rotor back iron, decreasing the generator's total active mass. The effect of the Halbach array rotor pole number and magnet-to-magnet (M2M) gap on the airgap flux density and power capability is studied through analytical and 2/3-dimensional finite element (FEA) methods. Multiple parametric studies are performed for an example design to investigate the power capability of the proposed CAFPM generator concept. The parametric study results indicate that Halbach array implementation can reduce active mass with the trade-off of including significantly more magnetic material for a conventional machine of a similar size. Advancements in PCB technology or transitioning to alternative windings to improve winding fill factor could provide comparable performance to conventional cored machines with lower overall active mass.

Original language	English
Title of host publication	12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023
Pages	612-617
Number of pages	6
ISBN (Electronic)	9798350337938
DOIs	https://doi.org/10.1109/ICRERA59003.2023.10269322
State	Published - 2023
Event	12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023 - Oshawa, Canada Duration: Aug 29 2023 → Sep 1 2023

Publication series

Name	12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023

Conference

Conference	12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023
Country/Territory	Canada
City	Oshawa
Period	8/29/23 → 9/1/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Funding

This paper is based upon work supported by the National Science Foundation (NSF) under Award No. #1809876. The support for Donovin Lewis through an NSF Fellowship under Grant No. 1839289, and of ANSYS Inc., and University of Kentucky, the L. Stanley Pigman Chair in Power endowment is also gratefully acknowledged. Any findings and conclusions expressed herein are those of the authors and do not necessarily reflect the views of the NSF.

Funders	Funder number
National Science Foundation Arctic Social Science Program	1809876, 1839289
National Science Foundation Arctic Social Science Program
University of Kentucky
ANSYS

Keywords

AFPM machine
Direct-drive generator
FEA
Halbach array
PCB stator
coreless machine
wind turbine

ASJC Scopus subject areas

Energy Engineering and Power Technology
Renewable Energy, Sustainability and the Environment
Electrical and Electronic Engineering
Mechanical Engineering
Control and Optimization

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1109/ICRERA59003.2023.10269322

Cite this

Vatani, M., Mohammadi, A., Lewis, D., Eastham, J. F., & Ionel, D. M. (2023). Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine. In 12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023 (pp. 612-617). (12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023). https://doi.org/10.1109/ICRERA59003.2023.10269322

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title = "Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine",

abstract = "This paper proposes a concept for a coreless axial flux permanent magnet (CAFPM) generator with a double-sided Halbach array rotor for direct-drive offshore wind turbine applications. The application of printed circuit board (PCB) technology is explored as applied to a concentrated winding stator due to its high reliability, repeatability, and fast mass production. A double-sided Halbach array rotor is employed to intensify the airgap flux density and to enable the elimination of the rotor back iron, decreasing the generator's total active mass. The effect of the Halbach array rotor pole number and magnet-to-magnet (M2M) gap on the airgap flux density and power capability is studied through analytical and 2/3-dimensional finite element (FEA) methods. Multiple parametric studies are performed for an example design to investigate the power capability of the proposed CAFPM generator concept. The parametric study results indicate that Halbach array implementation can reduce active mass with the trade-off of including significantly more magnetic material for a conventional machine of a similar size. Advancements in PCB technology or transitioning to alternative windings to improve winding fill factor could provide comparable performance to conventional cored machines with lower overall active mass.",

keywords = "AFPM machine, Direct-drive generator, FEA, Halbach array, PCB stator, coreless machine, wind turbine",

author = "Matin Vatani and Ali Mohammadi and Donovin Lewis and Eastham, {John F.} and Ionel, {Dan M.}",

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year = "2023",

doi = "10.1109/ICRERA59003.2023.10269322",

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Vatani, M, Mohammadi, A, Lewis, D, Eastham, JF & Ionel, DM 2023, Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine. in 12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023. 12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023, pp. 612-617, 12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023, Oshawa, Canada, 8/29/23. https://doi.org/10.1109/ICRERA59003.2023.10269322

Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine. / Vatani, Matin; Mohammadi, Ali; Lewis, Donovin et al.
12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023. 2023. p. 612-617 (12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Vatani, Matin

AU - Mohammadi, Ali

AU - Lewis, Donovin

AU - Eastham, John F.

AU - Ionel, Dan M.

PY - 2023

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N2 - This paper proposes a concept for a coreless axial flux permanent magnet (CAFPM) generator with a double-sided Halbach array rotor for direct-drive offshore wind turbine applications. The application of printed circuit board (PCB) technology is explored as applied to a concentrated winding stator due to its high reliability, repeatability, and fast mass production. A double-sided Halbach array rotor is employed to intensify the airgap flux density and to enable the elimination of the rotor back iron, decreasing the generator's total active mass. The effect of the Halbach array rotor pole number and magnet-to-magnet (M2M) gap on the airgap flux density and power capability is studied through analytical and 2/3-dimensional finite element (FEA) methods. Multiple parametric studies are performed for an example design to investigate the power capability of the proposed CAFPM generator concept. The parametric study results indicate that Halbach array implementation can reduce active mass with the trade-off of including significantly more magnetic material for a conventional machine of a similar size. Advancements in PCB technology or transitioning to alternative windings to improve winding fill factor could provide comparable performance to conventional cored machines with lower overall active mass.

AB - This paper proposes a concept for a coreless axial flux permanent magnet (CAFPM) generator with a double-sided Halbach array rotor for direct-drive offshore wind turbine applications. The application of printed circuit board (PCB) technology is explored as applied to a concentrated winding stator due to its high reliability, repeatability, and fast mass production. A double-sided Halbach array rotor is employed to intensify the airgap flux density and to enable the elimination of the rotor back iron, decreasing the generator's total active mass. The effect of the Halbach array rotor pole number and magnet-to-magnet (M2M) gap on the airgap flux density and power capability is studied through analytical and 2/3-dimensional finite element (FEA) methods. Multiple parametric studies are performed for an example design to investigate the power capability of the proposed CAFPM generator concept. The parametric study results indicate that Halbach array implementation can reduce active mass with the trade-off of including significantly more magnetic material for a conventional machine of a similar size. Advancements in PCB technology or transitioning to alternative windings to improve winding fill factor could provide comparable performance to conventional cored machines with lower overall active mass.

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KW - PCB stator

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KW - wind turbine

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Vatani M, Mohammadi A, Lewis D, Eastham JF, Ionel DM. Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine. In 12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023. 2023. p. 612-617. (12th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2023). doi: 10.1109/ICRERA59003.2023.10269322

Coreless Axial Flux Halbach Array Permanent Magnet Generator Concept for Direct-Drive Wind Turbine

Abstract

Publication series

Conference

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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