Investigating the Performance of a Variable Stiffness Magnetic Spring for Resonant Ocean Power Generation

Hossain, Md Emrad; Bird, Jonathan Z.

doi:10.1109/ecce.2019.8912306

Investigating the Performance of a Variable Stiffness Magnetic Spring for Resonant Ocean Power Generation

Conference · Sun Sep 01 00:00:00 EDT 2019 · 2019 IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ecce.2019.8912306· OSTI ID:2371240

Hossain, Md Emrad ^[1]; ^[2]

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

This paper presents a new type of variable stiffness magnetic spring which can have a highly linear translational force characteristic. The variable stiffness is achieved through the rotation of a central magnet. Both positive and negative spring constants can be created. Using an analytic-based field analysis modelling technique the operating principle and linearity characteristics of the adjustable magnetic spring are studied. The use of a magnetic spring with an adjustable negative spring constant could enable an ocean generator to continuously operate in a resonant state thereby greatly increasing its power generation capability. The presented variable stiffness spring could also be useful in other energy harvesting and robotic actuator applications.

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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:: 2371240

Journal Information:: 2019 IEEE Energy Conversion Congress and Exposition (ECCE), Journal Name: 2019 IEEE Energy Conversion Congress and Exposition (ECCE)

Country of Publication:: United States

Language:: English

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