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Design and performance testing of a large direct-drive generator for low speed and high torque applications.

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Title: Design and performance testing of a large direct-drive generator for low speed and high torque applications.
Authors: Oh, Jin-An1 (AUTHOR), Sarbajit, Paul1 (AUTHOR), Kim, Dong-Jun1 (AUTHOR), Bang, Deok-je1 (AUTHOR) djbang@keri.re.kr, Lee, Ki-Wook2 (AUTHOR), Yoon, Bae-Kwang3 (AUTHOR), Jang, Gang-Won4 (AUTHOR), Kang, Jong-Hoon5 (AUTHOR), Chang, Junghwan6 (AUTHOR)
Source: Journal of Mechanical Science & Technology. Apr2025, Vol. 39 Issue 4, p1641-1651. 11p.
Subjects: Tidal power, Finite element method, Permanent magnets, Wind power, Test systems, Permanent magnet generators
Abstract: This paper aims to design and experimentally validate a large direct-drive permanent magnet generator for low speed and high torque applications such as tidal and wind power generation systems. Direct-drive generator systems are often favored over geared systems due to their superior reliability and availability. Consequently, the focus of this paper is on the direct-drive generator concept. The electromagnetic configuration is based on a radial flux surface-mounted permanent magnet machine, utilizing segmented iron cores and windings in the stator. Large direct-drive generators typically operate at low speeds with high torque ratings, which limits the effectiveness of conventional motor-generator test beds for testing such high-torque systems. To address this limitation, the paper discusses a performance verification method using an internal back-to-back test, thereby eliminating the need for a large motorgenerator test bed. The paper begins with a rough design of the generator's electromagnetic parts, followed by a detailed electromagnetic and mechanical design using finite element analysis. Next, the internal back-to-back test is presented as a means of design validation and performance assessment of a direct-drive generator for low speed and high torque applications. The generator output closely matched the results of the analysis and the test. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Mechanical Science & Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Design and performance testing of a large direct-drive generator for low speed and high torque applications.
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  Data: <searchLink fieldCode="AR" term="%22Oh%2C+Jin-An%22">Oh, Jin-An</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sarbajit%2C+Paul%22">Sarbajit, Paul</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Dong-Jun%22">Kim, Dong-Jun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bang%2C+Deok-je%22">Bang, Deok-je</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> djbang@keri.re.kr</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Ki-Wook%22">Lee, Ki-Wook</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yoon%2C+Bae-Kwang%22">Yoon, Bae-Kwang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jang%2C+Gang-Won%22">Jang, Gang-Won</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kang%2C+Jong-Hoon%22">Kang, Jong-Hoon</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chang%2C+Junghwan%22">Chang, Junghwan</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Mechanical+Science+%26+Technology%22">Journal of Mechanical Science & Technology</searchLink>. Apr2025, Vol. 39 Issue 4, p1641-1651. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Tidal+power%22">Tidal power</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Permanent+magnets%22">Permanent magnets</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+power%22">Wind power</searchLink><br /><searchLink fieldCode="DE" term="%22Test+systems%22">Test systems</searchLink><br /><searchLink fieldCode="DE" term="%22Permanent+magnet+generators%22">Permanent magnet generators</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper aims to design and experimentally validate a large direct-drive permanent magnet generator for low speed and high torque applications such as tidal and wind power generation systems. Direct-drive generator systems are often favored over geared systems due to their superior reliability and availability. Consequently, the focus of this paper is on the direct-drive generator concept. The electromagnetic configuration is based on a radial flux surface-mounted permanent magnet machine, utilizing segmented iron cores and windings in the stator. Large direct-drive generators typically operate at low speeds with high torque ratings, which limits the effectiveness of conventional motor-generator test beds for testing such high-torque systems. To address this limitation, the paper discusses a performance verification method using an internal back-to-back test, thereby eliminating the need for a large motorgenerator test bed. The paper begins with a rough design of the generator's electromagnetic parts, followed by a detailed electromagnetic and mechanical design using finite element analysis. Next, the internal back-to-back test is presented as a means of design validation and performance assessment of a direct-drive generator for low speed and high torque applications. The generator output closely matched the results of the analysis and the test. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Mechanical Science & Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s12206-025-2105-1
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        Text: English
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        PageCount: 11
        StartPage: 1641
    Subjects:
      – SubjectFull: Tidal power
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Permanent magnets
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      – SubjectFull: Wind power
        Type: general
      – SubjectFull: Test systems
        Type: general
      – SubjectFull: Permanent magnet generators
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            – D: 01
              M: 04
              Text: Apr2025
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              Y: 2025
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