Research areas A and C
Cluster of Excellence livMatS @ FIT – Freiburg Center for Interactive Materials and Bioinspired Technologies
Electret-based fluttering for wind energy harvesting with internal structure
Extracting a few microwatts to a few milliwatts power from ambient wind can drive self-sustained small-scale systems, such as off-grid sensor/actuator networks or lab-on-a-chip electronics.
Electret materials are the electrostatic counterparts of magnets. A charged electret has a permanent charge distribution at its surface or electric dipoles on the inside. When placed in the space between two sides of a capacitive structure, it can electrostatically charge the capacitor. This setup can be used to harvest energy, i.e. by connecting a resistive load to the capacitor: if the geometry of the capacitor alternates due to an external stimuli such as lift/drag force applied by wind stream, an alternating current flows in the electrical circuit through the load.
In this project within Research Areas A and C, the aim is to produce the desired power output at low and near-calm wind conditions. In this regard, I implement aerodynamic schemes to increase the harvester’s vibrational frequency.
Prof. Dr. Peter Woias