High‐Performance Millimeter Scale Electromagnetic Generator

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Abstract Electromagnetic generator (EMG) is a promising alternative solution to traditional chemical batteries due its distinct advantages such as high reliability, power density, long lifetime, and wide applicability extreme environments. Recently, the EMG has been developed with magnetic levitation structure flux concentrator (MFC) methods increase electrical output performance by introducing repulsive force concentrating field. However, device scales down in dimension, undesirable interaction between magnets insufficient area severely limits of MFC. Here, high‐performance millimeter scale electromagnetic (mmEMG) devised MFC films on both ends coils inducing highly concentrated flux. The effect investigated depending various structural parameters simulation, confirmed experimentally. Also, influence properties characterization different soft materials studied. With this process, mmEMG optimized showing 4 mWcm −3 despite light weight tiny size, 5.6‐fold improvement terms output. Finally, powering commercial electronics are successfully demonstrated constructed self‐powered feedback‐based gripper control system integrating via machine learning.

Language: Английский

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Nonlinear oscillators coupled by magnetic fields generated by electric coils connected in series and their applications in vibrations suppression and energy harvesting

International Journal of Non-Linear Mechanics, Journal Year: 2025, Volume and Issue: unknown, P. 105135 - 105135

Published: April 1, 2025

Language: Английский

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Output characteristic of thin-film flexible piezoelectric generator with pure bending deformation via pneumatic energy excitation

Sensors and Actuators A Physical, Journal Year: 2024, Volume and Issue: 368, P. 115110 - 115110

Published: Feb. 6, 2024

Language: Английский

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A piezo-electromagnetic hybrid multi-directional vibration energy harvester in freight trains

Sustainable materials and technologies, Journal Year: 2024, Volume and Issue: 41, P. e00989 - e00989

Published: June 6, 2024

Language: Английский

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Improved energy harvesting by enhanced nonlinearities: New phenomena and experimental demonstration

Mechanical Systems and Signal Processing, Journal Year: 2024, Volume and Issue: 220, P. 111707 - 111707

Published: July 6, 2024

Language: Английский

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A complete physical 3D model from first principles of vibrational-powered electromagnetic generators

Applied Energy, Journal Year: 2023, Volume and Issue: 357, P. 122387 - 122387

Published: Dec. 12, 2023

The dynamic behavior of a vibrational electromagnetic generator using magnetic levitation architecture was theoretically and experimentally studied in great detail, when operating under wide range three-dimensional excitations. We developed complete rigorous physical model from first principles based on the theory electrodynamics continua, centered laws balance mass, linear momentum, angular energy entropy. Local gravitational body forces, couples powers were considered, surface tractions divided into constraint friction components, as well those due to external mechanical sources. momentum circuit equations resulted up 13 non-linear differential describing dynamics levitating-magnet container, relating input forces torques with output displacement, voltage. yielded consistent equivalence between time rate change internal kinetic potential energies power, associated circuit, Ohmic losses losses, power being supplied system by environment. Both proven tend increase equally resonant conditions. levitating shown be sensitive axial translational centrifugal inertial each one effectively resulting uni-stable or bi-stable system. dynamical response multiple initial conditions dependent steady-states, hysteretic frequency chaotic characteristics. Relevant guidelines optimize conversion efficiency harvesters are provided. This validated experimental tests, including general 3D motions combining translations rotations: cross-correlations exceeding 90% achieved. Such Newtonian Langrangian modelling approaches hold easily adapted other generators, degrees-of-freedom various environments, such that significant advances technologies can supported.

Language: Английский

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A novel M-shaped 2-DOF piezoelectric energy harvester with built-in outer-inner magnetic tri-stable oscillators for energy converting enhancement and applications

Mechanical Systems and Signal Processing, Journal Year: 2023, Volume and Issue: 208, P. 111055 - 111055

Published: Dec. 24, 2023

Language: Английский

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Two-dimensional elliptically shaped electromagnetic vibration energy harvester

Sensors and Actuators A Physical, Journal Year: 2022, Volume and Issue: 350, P. 114091 - 114091

Published: Dec. 15, 2022

An elliptically shaped electromagnetic vibration energy harvester is presented for two- and one-dimensional motions with the easy tuning of resonance frequency. The consists a free-to-move ring-shaped permanent magnet radial magnetization, set cube magnets distributed in fixed holder, two coil windings located above below harvester. When device exposed to vibrations, ring moves until magnetic restoring force from pushes it back while inducing an on coils. performance characterized using XY-shaker, whose frequency swept 1 Hz 10 motion amplitudes 2 mm 4 both axes simultaneously. Unlike 1-D harvesters, resulting output power shows resonant frequencies at 4.5 7 Hz, which can generate around 1.5 mW. also displays nonlinear hardening resonator behaviour. Finally, 1D experimental results show that prototype depends its angular position respect direction source, reaching maximum 45∘.

Language: Английский

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High power electromagnetic vibration harvesting using a magnetic dumbbell structure

Journal of Sound and Vibration, Journal Year: 2022, Volume and Issue: 546, P. 117446 - 117446

Published: Nov. 17, 2022

This paper considers an electromagnetic energy harvester consisting of a tube with two fixed magnets and coils containing floating free-to-move dumbbell structure magnets. The shape has number benefits, including increased changing magnetic flux, controllable resonance frequency reduced friction. We experimentally characterize the power produced by between 4 Hz 20 in steps 0.5 for excitation amplitude 3 mm. is swept both ascending descending order. maximum 1.04 mW which occurs at 8.5 sweep where acceleration 0.87 g. density 50 μW/cm3 per unit mass 32 μW/g. shows softening resonator response hysteresis sweeps. Furthermore, peaks as function drive frequency, being almost equal magnitude. Finally, Fourier analysis have different harmonics, first peak characterized higher-order harmonics whereas second frequency.

Language: Английский

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Nonlinear Energy Harvesting by Piezoelectric Bionic ‘M’ Shape Generating Beam Featured in Reducing Stress Concentration

Micromachines, Journal Year: 2023, Volume and Issue: 14(5), P. 1007 - 1007

Published: May 6, 2023

Inspired by the flapping wings of seagulls during flight, a new low-cost, magnet-free, bistable piezoelectric energy harvester is proposed to obtain from low-frequency vibration and convert it into electrical reduce fatigue damage caused stress concentration. In order optimize power generation efficiency this harvesting, finite element analysis experimental tests were carried out. The results are in good agreement, superior performance improving concentration compared previous parabolic (bow-shaped) one using technology was quantitatively analyzed simulation, with maximum reduction 32.34%. showed that under optimal operating conditions, open-circuit voltage 11.5 V, output 73 μW. These indicate promising strategy, which provides reference for collecting vibrational environments.

Language: Английский

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