Multi-Mechanism Non-Linear Vibration Harvester Combining Inductive and Magnetostrictive Mechanisms

Abstract

In this study, we focus on developing a multi-mechanism energy harvester (MMEH) which combines magnetostrictive and inductive mechanisms with overall shape and size similar to AA battery. The multi-mechanism harvester was theoretically modeled, fabricated and experimentally characterized. The theoretical model combining analytical and FEM modeling techniques provides the system dynamics and output power for specific generator and magnetostrictive geometry at various source conditions. The prototype consisted of a cylindrical tube containing a magnetic levitation cavity where a center magnet oscillated through a copper coil. Magnetostrictive rods were mounted on the bottom and top cap of the cylindrical tube. In response to external vibrations, electrical energy was harvested from the relative motion between magnet and coil through Faraday's effect and from the magnetostrictive material through the Villari effect. The experimental results were compared to theoretical predictions for both mechanisms which showed reasonable agreement. The difference between model predictions and experiments are discussed in detail. The inductive mechanism generated 5. 3 mW, 2.57 mW, 0.27 mW at 0.9 G, 0.7 G and 0.4 G respectively.

Harvesting Energy from the Counterbalancing (Weaving) Movement in Bicycle Riding

“…The diagonal length of 22.4 mm in the vertical cross-section of the moving magnet ensures proper positioning inside the cylinder with inner diameter of 20.2 mm. Marin et al [ 15 , 16 ] have shown that the stiffness terms in such an system can be estimated by fitting the computational data with a 5th order non-linear curve and the damping constant is on the order of 0.0994. There were four solenoid windings on the outer surface of the cylindrical body for electromagnetic energy conversion.…”

“…Building upon the computational simulations available in literature on such nonlinear energy harvesters [ 15 , 16 ], we performed experiments to fine tune the parameters of the harvester for higher output by varying the dimensional and electrical variables as shown in Figure 3(b) and Figure 4 . A rapid prototyping machine, FDM Vantage (Stratasys, Eden Prairie, MN, USA) was used for fabrication of the structural components.…”

A Hybrid Microenergy Storage System for Power Supply of Forest Wireless Sensor Nodes

“…Different mechanisms are designed based on the characteristics of the energy being collected. The electromagnetic and piezoelectric energy of the same vibration source is collected using a mechanically combined EH device structure, as described in [17]. There is a severe impedance mismatch between the different mechanisms, requiring different power converters to handle them separately.…”

Wideband, low-frequency springless vibration energy harvesters: part II

“…A significant subset of research on low-frequency and wideband electromagnetic harvesting has been devoted to harvesters where motion is aligned with the gravitational field. The most prominent example is 'levitation-type' energy harvesters [4][5][6][7][8][9][10][11][12][13][14]15]. Those harvesters are made of a magnetic assembly, one or more magnets, serving as an inertial mass that oscillate up and down between two stationary end magnets, or one magnet and a closed cap, with opposite polarities to the magnetic assembly.…”