An Adjustable Stiffness Torsional Magnetic Spring with a Linear Stroke Length

Che, Dawei; Bird, Jonathan Z.; Hagmuller, Alex; Hossain, Md Emrad

doi:10.1109/ecce47101.2021.9595267

An Adjustable Stiffness Torsional Magnetic Spring with a Linear Stroke Length

Conference · Sun Oct 10 00:00:00 EDT 2021 · 2021 IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ecce47101.2021.9595267· OSTI ID:2371238

Che, Dawei ^[1]; ^[2]; Hagmuller, Alex; Hossain, Md Emrad

Portland State University
Portland State Univ., OR (United States)

This paper presents the analysis, mechanical design, and proof-of-principle experimental testing of a new type of adjustable stiffness torsional magnetic spring for an ocean generator application. Unlike prior published designs the rotary magnetic spring is shown to have a highly linear adjustable stroke length. The presented torsional spring is experimentally shown to be able to create a ± 45° angular stroke range with a peak torque of ± 39.1 N·m. The stiffness is adjusted by using a stepper motor to axially adjust the axial magnet offset. The stepper motor contains a brake so that power is not expended when maintaining a desired spring stiffness. It is shown that by using a series spring arrangement the stroke length can be extended to ± 90°.

Research Organization:: Portland State University

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Contributing Organization:: Portland State University

DOE Contract Number:: EE0008631

OSTI ID:: 2371238

Journal Information:: 2021 IEEE Energy Conversion Congress and Exposition (ECCE), Journal Name: 2021 IEEE Energy Conversion Congress and Exposition (ECCE)

Country of Publication:: United States

Language:: English

References (8)

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