Wideband Piezomagnetoelastic Vibration Energy Harvesting

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Lei, Anders^1 ; Thomsen, Erik V.^1

Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby

DK-2800, Denmark^1

关键词: Attraction force;    Linear operations;    Mechanical force;    Relative bandwidth;    Softening effect;    Vibration energy harvesters;    Vibration energy harvesting;    Wideband operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012121/pdf
DOI  :  10.1088/1742-6596/557/1/012121

来源: IOP

【 摘 要 】

This work presents a small-scale wideband piezomagnetoelastic vibration energy harvester (VEH) aimed for operation at frequencies of a few hundred Hz. The VEH consists of a tape-casted PZT cantilever with thin sheets of iron foil attached on each side of the free tip. The wideband operation is achieved by placing the cantilever in a magnetic field induced by either one or two magnets located oppositely of the cantilever. The attraction force created by the magnetic field and iron foils introduces a mechanical force in opposite direction of the cantilevers restoring force causing a spring softening effect. In linear operation (without magnets) the harvester generates a RMS power of 141 μW/g2at 588 Hz with a relative bandwidth of 3.8% over a 100 kΩ load resistor. When operated with one magnet ideally positioned opposite the cantilever, a RMS power of 265 μW/g2is generated at 270 Hz with a relative bandwidth of 25%.