# Investigation of a Novel Piezoelectric Harvester for Capturing Rotational Motion

## TL;DR

This paper introduces a new piezoelectric device that efficiently captures energy from rotational motion across multiple frequency bands.

## Contribution

The novelty lies in the adjustable rigid parallel connection design that enhances energy harvesting performance and bandwidth.

## Key findings

- The harvester achieves a maximum average power of 110.49 mW at 240 r/min.
- The rigid parallel connection increases energy harvesting bandwidth and output performance.

## Abstract

Piezoelectric energy harvesting technology has received great research interest in recent years. To harvest energy from rotational motion, this work proposes a cantilevered piezoelectric energy harvester based on an adjustable rigid parallel connection. The baffle was designed as a carrier for the rigid connection of the piezoelectric beams A, B and C. The theoretical model of the device was established, and equations for voltage and power were derived. The calculated intrinsic frequencies of the piezoelectric beams are consistent with the experimental results. The baffle size, the distance from the baffle to the free end, and the number of rotor bumps were used as variables in the experiments. The experimental results show that the proposed piezoelectric energy harvester can harvest energy across multiple frequency bands. The maximum average power of the proposed piezoelectric energy harvester is 110.49 mW at a load resistance of 10 kΩ and a rotational speed of 240 r/min. The maximum average power of the harvester is 36.44 mW at a load resistance of 10 kΩ and a rotational speed of 60 r/min. The rigid parallel connection not only broadens the energy harvesting bandwidth but also enhances the output performance of the harvester.