Multiphysics Modelling and Experimental Validation of a Bi-Axial Magnetoelectric Vibration Energy Harvester

Abstract:

This paper reports on the multiphysics modelling of a bi-axial vibration energy harvesting (VEH) approach, with experimental validation of the model predictions. The authors have developed a harvester able to generate voltage under bi-axial vibrations. The harvesting approach is based on a magnetoelectric (ME) transducer that is positioned between a fixed magnet and oscillating ball bearing, which steers a changing magnetic field through the transducer to generate a voltage. The transducer combines magnetostrictive and piezoelectric properties to convert magnetic potential into electrical energy. Analytical modelling of this phenomenon is difficult due to the highly coupled nature of this interaction, so Comsol multiphysics software is used to make predictions of output using the finite element method (FEM). A peak open-circuit harvester voltage of 39.4 V is predicted for a ball bearing oscillating with 4.5 mm amplitude, agreeing reasonably well with measured harvester voltage of approximately 35 V. The modelling is applied to a two-dimensional representation of the system, which is shown to be sufficient for a basic understanding of the highly coupled nature of interactions, and a basis for optimising the magnetoelectric vibration energy harvesting approach.

• Periodical: Key Engineering Materials (Volume 558)
• Pages: 465-476
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.558.465
• Online since: June 2013
• Authors: Joshua E. McLeod, Scott D. Moss
• Keywords: Bi-Axial, Magnetoelectric, Piezoelectric, Terfenol-D, Vibration Energy Harvesting

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