A Comparison of Methods to Measure the Coupling Coefficient of Electromagnetic Vibration Energy Harvesters

Mösch, Mario; Fischerauer, Gerhard

doi:10.3390/mi10120826

Cited by 17 publications

(12 citation statements)

References 24 publications

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“…Other nonlinear forms of the EC coefficient have been considered as sum of the EC coefficient of each coil turn [34,35]. Several measurement methods for the estimation of the EC coefficient are presented in [36]. The average deviations between different methods and simulations were about 5%.…”

Section: Electromechanical Couplingmentioning

confidence: 99%

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Effect of Nonlinear Electromechanical Coupling in Magnetic Levitation Energy Harvester

Kęcik

Kowalczuk

2021

Energies

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This paper investigates the possibility of converting vibrations to electricity. A numerical and an experimental study of a magnetic levitation harvester are proposed. The system can be highly efficient when the electrical parameters are correctly tuned. Mechanical and electrical interaction of the harvester is described by an electromechanical coupling. Fixed value, linear and nonlinear electromechanical coupling models are presented and compared. It has been shown that the nonlinear electromechanical coupling model is more suitable for higher oscillations of the magnet. The obtained results show that nonlinear resonance and recovered energy can be controlled by the simple configuration of the magnet coil position. The recovered energy from the top branch is significantly higher, but this solution is much harder to obtain.

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Section: Electromechanical Couplingmentioning

confidence: 99%

“…where u(t) is the induced voltage and φ is magnetic flux. In the case of relative motion between the coil and the magnet in the z direction, Equation (3) for a coil with N turns can be modified to [36]…”

Section: Constant Ec Modelmentioning

confidence: 99%

Effect of Nonlinear Electromechanical Coupling in Magnetic Levitation Energy Harvester

Kęcik

Kowalczuk

2021

Energies

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“…Then, the output power of an EMVEH device can be expressed as given by (6). It is clear from these equations that harvested power is mainly governed by the load resistance, the magnetic flux linkage, the coil resistance, and the relative motion of the coil and the magnet [20], [26]- [29].…”

Section: B Electromagnetic Subsystemmentioning

confidence: 99%

Investigation on Electromagnetic Vibration Energy Harvesting in Water Distribution Control Valves

et al. 2021

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Control stations of a water distribution system monitor several variables such as the pressure, the flow, and the quality of water. For these monitoring tasks, wireless sensor networks with ultra-low power consumption powered by vibration-based energy harvesters as an alternative to the usage of batteries or wired connections might be a suitable option in these facilities. This article investigates the potential applicability of an electromagnetic vibration energy harvester prototype in different control valves of a water distribution system in the province of Barcelona by means of experimental measurements and numerical simulations. The low-amplitude vibration with random excitation is measured with piezoelectric accelerometers in three control valves under normal operating conditions to process each signal and determine the dominant frequency in the complete spectrum, which is found to be in the order of magnitude of kHz, and the dominant frequency in the range of 10 to 100 Hz, where commercial harvesters normally operate. Numerical simulations of the harvester prototype are conducted in all cases with the same materials, geometries, and coil parameters, generating a maximum RMS load voltage and output power when the harvester's natural frequency matches the dominant frequencies of each vibration signal. The maximum output power estimated in these simulations is 1573.04 nW with a corresponding RMS load voltage of 53.6 mV and optimal load resistance of 1830 Ω.

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“…The energy harvester converts the vibration energy into electrical energy via electromagnetic coupling and, as mentioned, is based on the bending beam design. The authors have already published a smaller but similar model without a coupling magnet at the free end [ 36 ]. The beam is made of copper and is 0.7-mm thick and 10-mm wide.…”

Section: System Setupmentioning

confidence: 99%

“…The step width of the frequency sweep was set to 50 mHz. The same test bench was previously used in [ 36 ].…”

Section: System Setupmentioning

confidence: 99%

A Self-Adaptive and Self-Sufficient Energy Harvesting System

Mösch

Fischerauer

Hoffmann

2020

Sensors

Self Cite

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Self-adaptive vibration energy harvesters convert the kinetic energy from vibration sources into electrical energy and continuously adapt their resonance frequency to the vibration frequency. Only when the two frequencies match can the system harvest energy efficiently. The harvesting of vibration sources with a time-variant frequency therefore requires self-adaptive vibration harvesting systems without human intervention. This work presents a self-adaptive energy harvesting system that works completely self-sufficiently. Using magnetic forces, the axial load on a bending beam is changed and thus the resonance frequency is set. The system achieves a relative tuning range of 23% at a center frequency of 36.4 Hz. Within this range, the resonance frequency of the harvester can be set continuously and precisely. With a novel optimized method for frequency measurement and with customized electronics, the system only needs 22 µW to monitor the external vibration frequency and is therefore also suitable for environments with low vibration amplitudes. The system was verified on a vibrational test bench and can easily be tailored to a specific vibration source.

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A Comparison of Methods to Measure the Coupling Coefficient of Electromagnetic Vibration Energy Harvesters

Cited by 17 publications

References 24 publications

Effect of Nonlinear Electromechanical Coupling in Magnetic Levitation Energy Harvester

Effect of Nonlinear Electromechanical Coupling in Magnetic Levitation Energy Harvester

Investigation on Electromagnetic Vibration Energy Harvesting in Water Distribution Control Valves

A Self-Adaptive and Self-Sufficient Energy Harvesting System

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