Investigating the Performance of a Variable Stiffness Magnetic Spring for Resonant Ocean Power Generation
This material is based upon work partially supported by the Department of Energy’s Office of Energy Efficiency and Re newable Energy (EERE) under the Water Power Technolo gies Office award number DE-EE0001837.
2019 IEEE Energy Conversion Congress and Exposition (ECCE)
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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M. E. Hossain and J. Z. Bird, "Investigating the Performance of a Variable Stiffness Magnetic Spring for Resonant Ocean Power Generation," 2019 IEEE Energy Conversion Congress and Exposition (ECCE), Baltimore, MD, USA, 2019, pp. 5002-5008, doi: 10.1109/ECCE.2019.8912306.