IEEE Transactions on Magnetics
This paper presents the electromagnetic and mechanical design and analyses of a 7.67:1 gear ratio magnetic gear for a wave energy converter demonstrator. A 2-D and 3-D magnetostatic finite element analysis (FEA) was conducted to maximize the mass torque density. To increase torque without increasing the diameter a unique dual-stack rotor topology was used along with a twelve-segment per pole-pair inner rotor Halbach array and a four-segment per pole-pair outer rotor Halbach topology. The eddy current loss within the magnetic gear was mitigated by using laminated magnets and a low-loss electrical steel. The experimentally tested magnetic gear had a peak torque of 1796.8 N∙m which corresponds to an active region volumetric and mass torque density of 221.1 N∙m/L and 105.74 N∙m/kg, respectively. The efficiency at rated speed and maximum torque was measured to be 95%. A new in-plane eddy current loss mechanism was identified as being a primary reason for the measured electrical losses being higher than initially calculated.
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Baninajar, Hossein; Modaresahmadi, Sina; Wong, Ho Yin; Bird, Jonathan Z.; Williams, Wesley B.; DeChant, Bertrand; and Southwick, Parker, "A Dual-Stack Coaxial Magnetic Gear for a Wave Energy Conversion Generator" (2022). Electrical and Computer Engineering Faculty Publications and Presentations. 698.