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Design and fabrication of rotary magnetostrictvie energy harvester for knee-joint wearable applications

Baiping Yan (School of Automation, Guangdong University of Technology, Guangzhou, China and Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA)
Dazhuo Huang (School of Automation, Guangdong University of Technology, Guangzhou, China)
Junjie Hong (School of Automation, Guangdong University of Technology, Guangzhou, China)
Chengming Zhang (Harbin Institute of Industry, Harbin, China)

Circuit World

ISSN: 0305-6120

Article publication date: 17 February 2022

Issue publication date: 6 February 2023

127

Abstract

Purpose

This paper aims to present the design and fabrication of a rotary magnetostrictive energy generator, using to harvest the rotation energy of human knee joint.

Design/methodology/approach

A rotary magnetostrictive energy generator is presented in this paper. The harvester consists of six movable flat Terfenol-D rods, surround by the picked-up coils respective, and alternate permanent magnet (PM) array fixed in the upper cover of the stator. The harvester rotates like as a stepper motor, which has rotary electromagnetic power generating effect and impacted magnetostrictive power generating effect in its rotation. Modeling and simulation are used to validate the concept. A prototype of harvester is fabricated and subjected to the experimental characterization.

Findings

The size of proposed structure is control as 77 cm3, and its mass is about 0.21 kg. Huge induced voltage generated in the short-time impact situation, and that induced voltage in the harvester can up to 18.6 V at 0.32 s stepper rotation. Also, the presented harvester has good harvesting effects at low frequency human walking situation, which is suitable to be used for future researches of wearable knee joint applications.

Originality/value

A new concept of magnetostrictive harvester is presneted, which will be benefit for the application of human knee joint wearable. Also, this concept will give us more idea for collection of human movement energy.

Keywords

Acknowledgements

This work was supported by the Natural Science Foundation of Guangdong Province (Grant No. 2018A030313010) and Science and Technology Project of Guangzhou (Grant No.202102021135).

Data availabilityThe data that support the findings of this study are available from the corresponding author upon reasonable request.

Citation

Yan, B., Huang, D., Hong, J. and Zhang, C. (2023), "Design and fabrication of rotary magnetostrictvie energy harvester for knee-joint wearable applications", Circuit World, Vol. 49 No. 1, pp. 67-79. https://doi.org/10.1108/CW-01-2021-0002

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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