UM  > Faculty of Science and Technology  > DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
A new linear magnetic gear with adjustable gear ratios and its application for direct-drive wave energy extraction
Li, Wenlong1; Chau, K. T.1; Lee, Christopher H. T.1,2; Ching, T. W.3; Chen, Mu1; Jiang, J. Z.1
2017-05
Source PublicationRENEWABLE ENERGY
ISSN0960-1481
Volume105Pages:199-208
Abstract

In this paper, a new linear magnetic gear with multiple gear ratios is proposed. Unlike the conventional linear magnetic gears, the proposed one purposely utilizes the aluminum-nickel-cobalt (AINiCo) permanent magnets (PMs) as the excitation source. Due to the relatively low coetcivity, AINiCo PMs can be magnetized or demagnetized by applying an appropriate DC current pulse into the magnetizing winding. Thus, the pole-pair numbers of PMs on two movers can be varied accordingly so that different gear ratios can be achieved. Firstly, the mathematical modeling of the hysteresis loop of AINiCo PMs is established. Then, the proposed linear magnetic gear with adjustable gear ratios is presented. Instead of the traditional surface-mounted PM configuration, the proposed machine installs the PMs using the surface-inset and consequent-pole configuration. Hence, the adverse influence during the magnetizing or demagnetizing process can be minimized. Since the magnetizing windings are placed in the movers, no position control is required for the magnetizing or demagnetizing process. By applying finite element analysis, the electromagnetic performances of the proposed linear magnetic gear with adjustable gear ratios are evaluated. Finally, the proposed linear magnetic gear is applied for direct-drive wave energy extraction. Owing to the capability of adjustable gear ratios, the wave energy converter can be operated in resonance with the waves at different sea states so that the maximized power can be captured. (C) 2016 Elsevier Ltd. All rights reserved.

KeywordPermanent Magnet Linear Magnetic Gear Variable Gear Ratio Direct-drive Wave Energy
DOI10.1016/j.renene.2016.12.026
URLView the original
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics ; Energy & Fuels
WOS SubjectGreen & Sustainable Science & Technology ; Energy & Fuels
WOS IDWOS:000393726200020
PublisherPERGAMON-ELSEVIER SCIENCE LTD
The Source to ArticleWOS
Fulltext Access
Citation statistics
Cited Times [WOS]:3   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China
2.Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, USA
3.Faculty of Science and Technology, University of Macau, Macao, China
Recommended Citation
GB/T 7714
Li, Wenlong,Chau, K. T.,Lee, Christopher H. T.,et al. A new linear magnetic gear with adjustable gear ratios and its application for direct-drive wave energy extraction[J]. RENEWABLE ENERGY,2017,105:199-208.
APA Li, Wenlong,Chau, K. T.,Lee, Christopher H. T.,Ching, T. W.,Chen, Mu,&Jiang, J. Z..(2017).A new linear magnetic gear with adjustable gear ratios and its application for direct-drive wave energy extraction.RENEWABLE ENERGY,105,199-208.
MLA Li, Wenlong,et al."A new linear magnetic gear with adjustable gear ratios and its application for direct-drive wave energy extraction".RENEWABLE ENERGY 105(2017):199-208.
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