Energy harvesting: MEMS µW power source
- Piezoelectric energy harvester with integrated micromagnets
- Integration of high density materials increases performance
- Contactless excitation by magnetic forces
- Broadband excitation far outside resonance
PowderMEMS makes it possible to use significantly denser materials as flywheel mass compared to the conventionally used silicon mass. This results in particularly high power densities under mechanical excitation compared to conventional systems.
In addition, the integration of micromagnets makes it possible to induce high forces without contact, and thus higher deflections of the bending beam. Thus, rotational or translational movements can be used for contactless energy harvesting by means of externally mounted magnets. If the initial deflection is sufficiently strong, the bending beam oscillates. This circumstance makes it possible to achieve high energy yields over a broad band of frequencies, i.e. frequencies well below the resonance frequency, which is extremely difficult to achieve with conventional systems. Outputs of more than 85 µW at about 45 Hz and more than 150 µW when operating in resonance have been achieved.
- Energy self-sufficient sensor technology in hard-to-reach places e.g. gearboxes,
starter generators, crankshafts, drill heads