Modelling and Optimization of a Magnetic Spring Based Electromagnetic Vibration Energy Harvester

Abstract

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An electromagnetic vibration energy harvester with compact flexure guide for low frequency applications

“…According to the previous research [12], with the increase of the number of stacked permanent magnets, the output power of the energy harvester is increased. Hence, multiple of stacked permanent magnets mounted were used as shown in figure 5.…”

“…The magnetic reluctance of the magnetic flux path is also reduced by the ferromagnetic gaskets as opposed to not having the gasket. In the consequence, the use of opposite polarity magnets and gaskets greatly improves the output characteristics of EVEH [12]. When an external excitation occurs, the stational coil will convert the kinetic energy of the moving permanent magnets into electrical energy.…”

“…Protype 2 stacked one generator on top of the other. Liao et al [12] used an optimized harvester with three internal stacked permanent magnets to produce 12 655 µW cm −3 g −2 normalized power density at 0.22 g acceleration and 9.9 Hz. The magnetic spring is simple in construction.…”

Two-dimensional elliptically shaped electromagnetic vibration energy harvester

“…A typical one-dimensional EMVEH is designed with three co-axial magnets with opposite polarities, such that the middle magnet is floating and free to move relative to a set of coils [8][9][10][11][12][13][14]. The magnet force in this configuration is a spring-like restoring force on the middle magnet [11].…”

Modelling and Investigation of Energy Harvesting System Utilizing Magnetically Levitated Permanent Magnet

“…Models of the magnet movement in the magnetic spring are derived from Newton's second law, where the movement of the magnet depends on the forces acting on it [12,[17][18][19][20][21][22][23][24]. In the modeling of the magnet movement, authors are often focused on magnetic spring equation, not on the movement equation.…”