Electromagnetic analysis and experimental testing of a flux focusing wind turbine magnetic gearbox

Journal Article · Mon Apr 15 00:00:00 EDT 2019 · IEEE Transactions on Energy Conversion

DOI:https://doi.org/10.1109/TEC.2019.2911966· OSTI ID:1505682

Li, Kang ^[1]; Modaresahmadi, Sina ^[1]; Williams, Wesley ^[1]; Bird, Jonathan ^[2]; Wright, Jason ^[1]; Barnett, David ^[1]

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1. Univ. of North Carolina, Charlotte, NC (United States)
2. Portland State Univ., Portland, OR (United States). Lab. for Electromechanical Energy Conversion and Control

The electromagnetic design of the second stage of a 59:1 multistage magnetic gearbox for a wind turbine demonstrator is presented here. The multistage series connected magnetic gearbox is composed of a 6.45:1 first stage and 9.14:1 second stage magnetic gear. The magnetic gears utilize a flux focusing spoke type rotor typology with a unique segmented fully laminated design. The electromagnetic impact of structural design changes on the second stage gearbox is considered with respect to torque density. Severe 3-D edge effects were encountered that greatly reduced the expect torque density of the stage 2 magnetic gear. Experimental testing of the multistage magnetic gear highlight unexpected problems associated with eddy current loss and torque ripple.

• Research Organization: Univ. of North Carolina, Charlotte, NC (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
• Grant/Contract Number: EE0006801
• OSTI ID: 1505682
• Journal Information: IEEE Transactions on Energy Conversion, Vol. 34, Issue 3; ISSN 0885-8969
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
gears
permanent magnet machines
magnetic flux density
magnetic forces
permanent magnets
torque