A Comparison of Two Planar Electromagnetic Vibrational Energy Harvesters Designs

Electromagnetic vibrational energy harvesters (EM-VEHs) are generally used to convert ambient vibrations into electricity energise low-power sensor nodes forming the Internet of Things (IoT). Usually such VEHs comprise coils and magnets orientated in vertical direction (z-direction) but these devices tend be quite bulky it is hard integrate them printed circuit board technology. Configuring a planar arrangement can lead more compact device better integration. Two EM-VEHs with different coil-magnet arrangements presented this paper. Both (referred as Design 1 2) employed same stack five Halbach arrangement, magnetic springs housing. In oscillated below four coils, while 2 were wrapped around housing through them. Harmonic excitation was experimentally compare two prototypes found that could generate significant higher output power than Desing (percentage increase ranging from 8292% at a_rms = 0.2g 559% 0.6g).