Abstract
Piezoelectric energy harvesting is a promising way to develop self-sufficient systems. Structural design and parameter optimization are key issues to improve the performance in applications. This paper presents a magnetic coupled piezoelectric energy harvester to increase the output and bandwidth. A lumped parameter model considering the static position is established and various modes are simulated. This paper focuses on the “Low frequency repulsion mode”, which is more practical. The experiment platform is built with the Macro Fiber Composite (MFC) material, and the results are consistent with the analytical simulation. The optimization process of some key parameters, such as magnets spacing and flux density, is carried out. The results show that there is a corresponding optimal spacing for each flux density, which is positive correlated. With the optimized parameter design, the system achieves peak electrical power of 3.28 mW under the harmonic excitation of 4 m/s2. Compared with the conventional single cantilever harvester, the operated bandwidth is increased by 66.7% and the peak output power is increased by 35.0% in experiment.
Highlights
In recent years, energy harvesting technology (EHT) has received extensive attention and promoted the development of self-sufficient systems
The results show that the performance of the the nonlinear magnetic coupled piezoelectric energy harvester is significantly better than linear
A high performance magnetic coupled piezoelectric energy harvester is studied in this paper
Summary
Energy harvesting technology (EHT) has received extensive attention and promoted the development of self-sufficient systems. EHT can convert various energy sources in the environment into electrical energy, providing energy for wireless low power consumption devices [1]. This “no maintenance” mode will greatly decrease maintenance costs and battery disposal problems. As a common physical phenomenon, vibration is widely found in production and living environments such as home appliances, vehicles, natural environments [5], and buildings [6]. It exists in life phenomena such as heartbeat [7] and limb activities [8]. The piezoelectric method based on cantilever structure has gained great attention due to its high energy conversion efficiency and simple processing design [14,15]
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