Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 58, Issue 5, Pages 6069-6080Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2022.3180705
Keywords
Rotors; Torque; Generators; Magnetic hysteresis; Magnetic analysis; Bars; Magnetostatics; Finite-element analysis (FEA); Halbach rotor; magnetic gear (MG); ocean generator
Funding
- Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy [DE-EE0008100]
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This article presents the electromagnetic and mechanical design, as well as experimental testing results for a 9.5:1 gear ratio, series connected, coaxial magnetic gear (MG) for use in a marine hydrokinetic generator. The unique slotted Halbach magnet arrangement used in this design enables high torque density, as shown by experimental results.
This article presents the electromagnetic and mechanical design as well as experimental testing results for a 9.5:1 gear ratio, series connected, coaxial magnetic gear (MG) for use in a marine hydrokinetic generator. A two- and three-dimensional magnetostatic finite-element analysis (FEA) sizing analysis was also conducted and a torque density comparison between using a nested or series MG typology is presented. To achieve a high torque density, a four-segment per pole-pair Halbach rotor assembly with a unique slotted Halbach magnet arrangement was used that enables the Halbach rotor magnets to be more easily assembled, even with dimensional tolerance inaccuracies. A deflection and thermal FEA analysis along with experimental validation test results are presented. The experimentally measured torque and torque density for the MG design are 188.4 N center dot m and 236.5 N center dot m/L, respectively.
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