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An Adjustable Stiffness Torsional Magnetic Spring with a Linear Stroke Length

Dawei Che, Jonathan Z. Bird, Alex Hagmuller, Md Emrad Hossain
2021 2021 IEEE Energy Conversion Congress and Exposition (ECCE)  

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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 o angular stroke range with a peak torque of ± 39.1 N•m. The stiffness is adjusted by using a stepper
more » ... otor 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 o .
doi:10.1109/ecce47101.2021.9595267 fatcat:xpvqgm2rtrfn3fbtqk4n24wule
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Dawei Che, Jonathan Z. Bird, Alex Hagmuller, Md Emrad Hossain. "An Adjustable Stiffness Torsional Magnetic Spring with a Linear Stroke Length." 2021 IEEE Energy Conversion Congress and Exposition (ECCE) (2021)