Piezoelectric power generator: A comparison of power generation between the resonant frequency and natural frequencies

Abstract

The capture of energy from the environment, mostly vibrations using piezoelectric materials is of great interest, justified by the intensive use of low-power portable devices and wireless sensors, without the need to use an external power supply. This presentation is an analysis of the vibration energy in an embedded metal structure, with mass at the free end. The metallic structure is coupled to a piezoelectric plate-type PZT-4. The dimensions of the piezoelectric plate are 10x10x0.5 mm. The material used is a brass metal structure and its dimensions are 70x10x0.3 mm. A cam-follower is used to excite the electrical generator with mechanical vibration in the range of 0-30 Hz. Results indicate that the system has a capability of low power generating a range of 200 to 300 mW. A circuit conditioner treats and stores the generated signal. Still, operational analysis on resonance frequency of the structure and natural frequencies of the system will be compared, presented and discussed.