Magneto-mechanically coupled electromagnetic harvesters for broadband energy harvesting

Abstract

A low frequency magneto-mechanically coupled energy harvesting system is proposed to increase the power magnitude and bandwidth simultaneously. The system consists of two pendulums that are magnetically and mechanically coupled. The analytical formulation for the coupled system is developed based on the extended Lagrangian formulation. The experimental and simulated results are reported. The results exhibiting the benefits of magneto-mechanical coupling are reported. The experiments show an increment of 30.69% in the power magnitude and 100% enhancement in the bandwidth when compared to independent harvesters even at a low amplitude of excitation. Moreover, Chaos is observed at low frequency and at a low amplitude, which tends to provide larger bandwidths with more power.

On the energy localization in weakly coupled oscillators for electromagnetic vibration energy harvesting

“…In this paper, a linear multimodal electromagnetic VEH with weakly-magnetic coupling is proposed in order to scavenge efficiently the ambient vibration energy by functionalizing the energy localization phenomenon. The elastic spring structure, used in the designed VEH device, permits to reduce significantly the mechanical damping factor ξ m = 0.11 % compared to existing VEH devices [15,29,34,35] . The paper shows that the energy localization phenomenon allows enhancing the harvested performance of the perturbed system by approximately 10 % compared to the non-perturbed system with a mass mistuning coefficient α ≈ 0.956.…”

“…Therefore, the most important issues concerning the vibration energy harvesters are the improvement of the harvested power density and their frequency bandwidth in which they are effectively operating. Several techniques are discussed to enhance energy harvesting performances, namely the nonlinear and multimodal methods which are widely exposed in order to increase the effective frequency bandwidth and to provide more reliable results [9][10][11][12][13][14][15][16]. Particularly, Many 2 degree of freedom (dof) vibration harvesters were proposed in the literature with the aim of improving the operating bandwidth.…”

Influences of surface charges and gap width between p-type and n-type semiconductors on charge pumping

“…Although mechanical-to-electric power conversion has been realized with several fundamental working principles, there still exists a very big challenge to miniaturize electric generators for smart applications [2][3][4][5][6]. Till today, many micro/nano generators have been studied to pursue an extraordinary capability of mechanical-electric power conversion [7][8][9][10][11].…”

Analysis and Optimization of a Piezoelectric Energy Harvester

“…Different transduction mechanisms (piezoelectric [1][2][3][4], electromagnetic [4][5][6], electrostatic [7,8]) have been studied for converting vibrations into electricity, but piezoelectric energy harvesting has received the most attention due to the high power density and ease of application [1]. Hybrid harvesters using combinations of piezoelectricity with either of the other two methods have also been studied [9,10].…”