Electromagnetic Vibration Energy Harvester Using Springless Proof Mass and Ferrofluid as a Lubricant

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Chae, S.H.^1 ; Ju, S.^1 ; Choi, Y.^1 ; Jun, S.^1 ; Park, S.M.^1 ; Lee, S.^1 ; Lee, H.W.^2 ; Ji, C.-H.^1

Department of Electronics Engineering, Ewha Womans University, Seoul, Korea, Republic of^1

Department of Neurology, Ewha Womans University School of Medicine, Seoul, Korea, Republic of^2

关键词: Copper windings;    Electromagnetic vibrations;    External vibrations;    Induced motions;    Maximum output power;    Proof of concept;    Rectangular permanent magnets;    Vibration exciters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012013/pdf
DOI  :  10.1088/1742-6596/476/1/012013

来源: IOP

【 摘 要 】

This paper presents an electromagnetic energy harvester using an array of rectangular permanent magnets as springless proof mass and ferrofluid as a lubricating material. Lateral motion of the multi-pole magnet array generates voltage across an array of copper windings formed under the aluminum channel in response to low frequency external vibrations such as human-body-induced motion. A proof-of-concept device has been fabricated and output voltage has been measured at various input frequencies and accelerations provided by a vibration exciter. Device with ferrofluid lubrication generated maximum open-circuit voltage of 0.47V at 3g vibration at 12Hz, which is 8% higher than that of the device without lubricant. Maximum output power of 71.26μW has been obtained at 40.8Ω with the device with ferrofluid lubrication.