Estudo e modelagem de capacitores variáveis complementares multiníveis por vibração em dois eixos para coleta de energia mecânica vibracional

Abstract

In this work, we present a study of a new electromechanical structure for complementary variable capacitors for application in vibrational energy harvesting. The purpose of the structure is to enable its fabrication in MEMS and that the structure can perform unconventional movements, different from the most common structures in the literature. The prototype is made with 3D printing using conductive ABS, so it is possible to observe the electromechanical behavior and the concept of a MEMS assembly for the structure. The circuits used are the Bennet Bender, 2-Stage Unipolar, and 3-Stage Unipolar, with their power sampled directly by a power sampler circuit. The device has been shown to be able to move on more than one axis freely and to move in a non-behavioral manner, being able to achieve power greater than 45 µW for this type of movement, with approximate frequency of 6 Hz. In other cases more behaved went from 80 µW and with frequency of 11 Hz.