78 / 2021-06-04 16:45:36

压电复合材料的磁电能量转换建模与实现

The magnetoelectric coupling based on the piezoelectric poly (vinylidene fluoride) (PVDF) has enticed high attention from the scientific ferroics community because of their strong potentials for improved energy harvesters in wireless communication and embedded technologies sensors. Thus, Energy Harvesting, especially the collection and utilization of the energy generated from the system has become a merit of ME materials when they are polarized and magnetized properly in a peculiar environment. In this paper, the magnetoelectric effect of Silver/PVDF/Silver composite with the piezoelectric properties was investigated. In addition, the finite element method (FEM) was used to study the eddy current flow within the silver electrodes, the strain induced by Lorentz force, and the magneto-electric energy conversion of cantilever beam structure model of the sample. Thus, the effects of the DC magnetic field and AC magnetic field on the output voltage of PVDF thin film were studied from the simulation and experimental techniques. It is found that the relationship between the DC magnetic field and the PVDF film output voltage is linear. With the increase of the DC magnetic field, the output voltage will also increase, which realizes the detection of the DC magnetic field. At the resonant frequency of 1kHz, the magnetoelectric voltage coefficient is obtained as 161.35 mV cm^-1 Oe^-1. Consequently, the higher the frequency of the AC magnetic field, the greater the induced current generated by the silver layer on the surface of the sample and the higher the output voltage of the Silver/PVDF/Silver structure provided a theoretical basis for the design of the magneto-electric energy collector.