Study the influence of magnetic force on nonlinear energy harvesting performance

Abstract

The effect of magnetic force on nonlinear energy harvesting performance is discussed theoretically and experimentally in this paper. A kind of nonlinear magnetic coupled piezoelectric energy harvester (NMPEH) is designed. The bidirectional screw is used to adjust the relative location of the tip magnets and external magnets to get different nonlinear magnetic forces. It is well known that the nonlinear magnetic force will influence the broadband energy harvesting performance. In order to describe the nonlinear dynamic behavior of the NMPEH, harmonic balance method is employed and its excitation test are performed at different accelerations over the range of 5-30Hz. It is also found that the analytical solutions match well with experimental output voltage. The nonlinear energy collector under the influence of symmetric magnetic force studied in this paper can not only reduce the resonance frequency of the system, but also increase the vibration amplitude of the cantilever beam, thus increasing the power obtained from the vibration environment.

PiezoMEMS Nonlinear Low Acceleration Energy Harvester with an Embedded Permanent Magnet

“…The results demonstrate that the attractive force configuration had decreased bandwidth of 2.1 Hz compared to 6.62 Hz for the repulsive force configuration, but the power density increased from 0.23 to 1.36 µW•mm −3 . The increased power was consistent with previous findings [33]. Power can be further increased by decreasing the magnetic spacing between magnets.…”

“…In the case of the in-plane configuration, the magnetic field or repulsion force was largest when the cantilever beam was at its original position and decreased when displacement was large. An attractive S-N magnetic force will have the opposite effect and increase the cantilever amplitude [33]. For example, an increase in displacement of an out-of-plane configuration will increase the magnetic force, which will further increase displacement and stress or strain, thus increasing the power generated.…”

A Review of Piezoelectric Vibration Energy Harvesting with Magnetic Coupling Based on Different Structural Characteristics

“…For this kind of monostable type piezoelectric energy harvester, the magnets are perpendicular to the piezoelectric beam [ 115 , 116 , 117 , 118 , 119 , 120 , 121 ]. Stanton et al modeled and experimentally validated a nonlinear energy harvester capable of bidirectional hysteresis [ 122 ] ( Figure 3 a).…”