A Multi-Stack Variable Stiffness Magnetic Torsion Spring for a Wave Energy Converter
- Portland State University,Department of Electrical and Computer Engineering,Portland,OR,USA,97201; Portland State University
- Portland State University,Department of Electrical and Computer Engineering,Portland,OR,USA,97201
- Aquaharmonics Inc.,West Linn,OR,USA,97068
This paper presents the design of a multi-stack high torque adjustable stiffness torsional magnetic spring for use in a wave energy converter. The torsional magnetic spring has a ±45 degrees linear stroke length with peak torque of 823 N⋅m. A 3-D magnetostatic finite element analysis parameter sizing sweeping analysis was performed and the peak energy density for the selected torsion spring was computed to be 12.6 J/kg. The required torque was increased by using a unique seven-stage multi-stacking design. The stiffness of magnetic torsion spring is adjusted through the axial translation of the inner rotor. The presented design is shown to be capable of providing both positive and negative stiffness with equal characteristics and has a very high degree of linearity. The experimental prototype assembly and test-setup used to verify the torsional spring performance is presented.
- Research Organization:
- Portland State University
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Contributing Organization:
- Portland State University
- DOE Contract Number:
- EE0008631
- OSTI ID:
- 2371236
- Report Number(s):
- DOE-PORTLAND-08631
- Journal Information:
- 2022 IEEE Energy Conversion Congress and Exposition (ECCE), Journal Name: 2022 IEEE Energy Conversion Congress and Exposition (ECCE)
- Country of Publication:
- United States
- Language:
- English
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