Design and Implementation of an Energy Harvester with a Fluid Core

In the present work, a new type granular core has been studied and implemented to a mechanically excited electromagnetic harvester. The system mainly consists of a linear fluid core and a surrounding winding. The system entirely depends on the vibration of the fluid core indicating a highly fluid dynamical feature, whereas the winding component of the harvester stays at rest. The tests have proven that the generated energy depends on the vibration frequency and mass of the ferromagnetic granules. An rms power and voltage values are found as P=1 mW and U= 40 mV at m= 28.7 g ferromagnetic granules and 30-62 Hz frequencies, respectively.