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Title: Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox

Abstract

This paper presents here the design investigation and experimental testing of a flux-focusing magnetic gearbox with a fully laminated rotor structure. The unique feature of this flux-focusing magnetic gearbox design is that the three rotors are each made of a single lamination stack, and the central modulation structure is retained in place without the use of a resin filler such as epoxy. Ferromagnetic bridges are used to connect individual pole pieces together. It is shown that the use of the ferromagnetic bridges reduces the calculated torque density from 156 Nm/L to 139 Nm/L (a reduction of 11%). The experimentally measured torque density is, however, only 97 Nm/L. The reason for this discrepancy is associated with the demagnetization of the magnets.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2]
+ Show Author Affiliations
  1. Univ. of North Carolina, Charlotte, NC (United States). Dept. of Electrical and Computer Engineering
  2. Univ. of North Carolina, Charlotte, NC (United States). Dept. of Engineering Technology
  3. Portland State Univ., Portland, OR (United States). Lab. for Electromagnetic Energy Conversion and Control. Dept. of Electrical and Computer Engineering
Publication Date:
Research Org.:
Univ. of North Carolina, Charlotte, NC (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
OSTI Identifier:
1505684
Grant/Contract Number:  
EE0006801
Resource Type:
Accepted Manuscript
Journal Name:
Progress in Electromagnetics Research C
Additional Journal Information:
Journal Volume: 87; Journal ID: ISSN 1937-8718
Publisher:
EMW Publishing
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Li, Kang, Uppalapati, Krishna Kiran, Wright, Jason, Kadel, Joshua, Bird, Jonathan, and Willimas, Wesley. Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox. United States: N. p., 2018. Web. doi:10.2528/PIERC18062509.
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Li, Kang, Uppalapati, Krishna Kiran, Wright, Jason, Kadel, Joshua, Bird, Jonathan, & Willimas, Wesley. Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox. United States. https://doi.org/10.2528/PIERC18062509
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Li, Kang, Uppalapati, Krishna Kiran, Wright, Jason, Kadel, Joshua, Bird, Jonathan, and Willimas, Wesley. Mon . "Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox". United States. https://doi.org/10.2528/PIERC18062509. https://www.osti.gov/servlets/purl/1505684.
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@article{osti_1505684,
title = {Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox},
author = {Li, Kang and Uppalapati, Krishna Kiran and Wright, Jason and Kadel, Joshua and Bird, Jonathan and Willimas, Wesley},
abstractNote = {This paper presents here the design investigation and experimental testing of a flux-focusing magnetic gearbox with a fully laminated rotor structure. The unique feature of this flux-focusing magnetic gearbox design is that the three rotors are each made of a single lamination stack, and the central modulation structure is retained in place without the use of a resin filler such as epoxy. Ferromagnetic bridges are used to connect individual pole pieces together. It is shown that the use of the ferromagnetic bridges reduces the calculated torque density from 156 Nm/L to 139 Nm/L (a reduction of 11%). The experimentally measured torque density is, however, only 97 Nm/L. The reason for this discrepancy is associated with the demagnetization of the magnets.},
doi = {10.2528/PIERC18062509},
journal = {Progress in Electromagnetics Research C},
number = ,
volume = 87,
place = {United States},
year = {Mon Sep 17 00:00:00 EDT 2018},
month = {Mon Sep 17 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.2528/PIERC18062509
Copyright Statement
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Figures / Tables:

Figure 1 Figure 1: A 4.25 : 1 coaxial flux-focusing magnetic gearbox using flux focusing PMs. $p$1 = 4 pole-pairs, $n$2 = 17 steel poles and $p$3 = 13 pole-pairs on the outer rotor.
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Works referenced in this record:

Experimental Evaluation of Low-Speed Flux-Focusing Magnetic Gearboxes
journal, November 2014

  • Uppalapati, Krishna K.; Bomela, Walter B.; Bird, Jonathan Z.
  • IEEE Transactions on Industry Applications, Vol. 50, Issue 6
  • DOI: 10.1109/TIA.2014.2312551

A Magnetic Gearbox With an Active Region Torque Density of 239 N·m/L
journal, March 2018

  • Uppalapati, Kiran K.; Calvin, Matthew D.; Wright, Jason D.
  • IEEE Transactions on Industry Applications, Vol. 54, Issue 2
  • DOI: 10.1109/TIA.2017.2779418

Optimum Design for Improving Modulating-Effect of Coaxial Magnetic gear Using Response Surface Methodology and Genetic Algorithm
journal, January 2011

  • Jian, Linni; Xu, Guoqing; Song, Jianjian
  • Progress In Electromagnetics Research, Vol. 116
  • DOI: 10.2528/PIER11032316

Analytical Calculation of Magnetic Field Distribution in Coaxial Magnetic Gears
journal, January 2009

  • Jian, Linni; Chau, Kwok-Tong
  • Progress In Electromagnetics Research, Vol. 92
  • DOI: 10.2528/PIER09032301

Evaluation of Movement Facilitating Techniques for Finite Element Analysis of Magnetically Geared Electrical Machines
journal, February 2015

A Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Machine for Wind Power Generation
journal, January 2009

  • Jian, Linni; Chau, K. T.; Jiang, J. Z.
  • IEEE Transactions on Industry Applications, Vol. 45, Issue 3
  • DOI: 10.1109/TIA.2009.2018974

Design, analysis and realisation of a high-performance magnetic gear
journal, January 2004

  • Atallah, K.; Calverley, S. D.; Howe, D.
  • IEE Proceedings - Electric Power Applications, Vol. 151, Issue 2
  • DOI: 10.1049/ip-epa:20040224

An Iterative Magnetomechanical Deflection Model for a Magnetic Gear
journal, February 2014

Experimental Evaluation of a Motor-Integrated Permanent-Magnet Gear
journal, March 2013

  • Rasmussen, Peter Omand; Frandsen, Tommy V.; Jensen, Kasper K.
  • IEEE Transactions on Industry Applications, Vol. 49, Issue 2
  • DOI: 10.1109/TIA.2013.2242423

Comparison of Magnetic-Geared Permanent-Magnet Machines
journal, January 2013

  • Li, Xianglin; Chau, Kwok-Tong; Cheng, Ming
  • Progress In Electromagnetics Research, Vol. 133
  • DOI: 10.2528/PIER12080808

Development of a High-Performance Magnetic Gear
journal, May 2005

  • Rasmussen, P. O.; Andersen, T. O.; Jorgensen, F. T.
  • IEEE Transactions on Industry Applications, Vol. 41, Issue 3
  • DOI: 10.1109/TIA.2005.847319

Proposal of new-shaped pole pieces for a magnetic-geared generator
journal, December 2016

  • Nobuhara, Shugo; Hirata, Katsuhiro; Niguchi, Noboru
  • International Journal of Applied Electromagnetics and Mechanics, Vol. 52, Issue 1-2
  • DOI: 10.3233/JAE-162072
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    Figures / Tables found in this record:

    Figure 1 (p. 2)figure
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    Table 1 (p. 4)table
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    Table 3 (p. 10)table
    Figure 20 (p. 11)figure
    Table 4 (p. 11)table
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