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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]
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Database: Engineering Source
Description
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]
ISSN:1738494X
DOI:10.1007/s12206-025-2105-1