Novel screen printed and flexible low frequency magneto-electric energy harvester

Using the piezoelectric effect to harvest energy from surrounding vibrations is a promising alternative solution for powering small electronic devices such as wireless sensors and portable devices. A conventional piezoelectric energy harvester (PEH) can only efficiently collect energy within a small range around the resonance frequency. To realize broadband vibration energy harvesting, the idea of multiple-degrees-of-freedom (DOF) PEH to realize multiple resonant frequencies within a certain range has been recently proposed and some preliminary research has validated its feasibility. Therefore, this paper proposed a multi-DOF wideband PEH based on the frequency interval shortening mechanism to realize five resonance frequencies close enough to each other. The PEH consists of five tip masses, two U-shaped cantilever beams and a straight beam, and tuning of the resonance frequencies is realized by specific parameter design. The electrical characteristics of the PEH are analyzed by simulation and experiment, validating that the PEH can effectively expand the operating bandwidth and collect vibration energy in the low frequency. Experimental results show that the PEH has five low-frequency resonant frequencies, which are 13, 15, 18, 21 and 24 Hz; under the action of 0.5 g acceleration, the maximum output power is 52.2, 49.4, 61.3, 39.2 and 32.1 μW, respectively. In view of the difference between the simulation and the experimental results, this paper conducted an error analysis and revealed that the material parameters and parasitic capacitance are important factors that affect the simulation results. Based on the analysis, the simulation is improved for better agreement with experiments.

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Investigations on Piezo Active Layer of Low Frequency Cantilever Structured Vibration Energy Harvester for Cordless Cranial Drill

2021 7th International Conference on Advanced Computing and Communication Systems (ICACCS) ◽

10.1109/icaccs51430.2021.9441896 ◽

2021 ◽

Author(s):

Y Kartheek Krishna Chaitanya ◽

Venkata Sai Akhil Nidadavolu ◽

Lekshmi S Ajay ◽

Karthika Chandran ◽

K Partha Narayanaswamy ◽

...

Keyword(s):

Active Layer ◽

Energy Harvester ◽

Low Frequency ◽

Vibration Energy ◽

Vibration Energy Harvester

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Study of the Properties of a Hybrid Piezoelectric and Electromagnetic Energy Harvester for a Civil Engineering Low-Frequency Sloshing Environment

Energies ◽

10.3390/en14020391 ◽

2021 ◽

Vol 14 (2) ◽

pp. 391

Author(s):

Nan Wu ◽

Yuncheng He ◽

Jiyang Fu ◽

Peng Liao

Keyword(s):

Output Power ◽

Energy Harvester ◽

Civil Engineering ◽

Maximum Output Power ◽

Low Frequency ◽

Electromagnetic Energy ◽

Maximum Output ◽

Piezoelectric Film ◽

Hybrid Energy ◽

Level Height

In this paper a novel hybrid piezoelectric and electromagnetic energy harvester for civil engineering low-frequency sloshing environment is reported. The architecture, fabrication and characterization of the harvester are discussed. The hybrid energy harvester is composed of a permanent magnet, copper coil, and PVDF(polyvinylidene difluoride) piezoelectric film, and the upper U-tube device containing a cylindrical fluid barrier is connected to the foundation support plate by a hinge and spring. The two primary means of energy collection were through the vortex street, which alternately impacted the PVDF piezoelectric film through fluid shedding, and the electromotive force (EMF) induced by changes in the magnetic field position in the conducting coil. Experimentally, the maximum output power of the piezoelectric transformer of the hybrid energy harvester was 2.47 μW (circuit load 270 kΩ; liquid level height 80 mm); and the maximum output power of the electromagnetic generator was 2.72 μW (circuit load 470 kΩ; liquid level height 60 mm). The low-frequency sloshing energy collected by this energy harvester can drive microsensors for civil engineering monitoring.

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Multi-Stable Magnetic Spring-Based Energy Harvester Subject to Harmonic Excitation: Comparative Study and Experimental Evaluation

Volume 4B: Dynamics, Vibration, and Control ◽

10.1115/imece2018-86157 ◽

2018 ◽

Author(s):

Hieu Nguyen ◽

Hamzeh Bardaweel

Keyword(s):

Energy Harvesting ◽

Kinetic Energy ◽

Comparative Study ◽

Experimental Evaluation ◽

Chaotic Motion ◽

Energy Harvester ◽

Electric Energy ◽

Harmonic Excitation ◽

Jump Frequency ◽

Piezoelectric Elements

The work presented here investigates a unique design platform for multi-stable energy harvesting using only interaction between magnets. A solid cylindrical magnet is levitated between two stationary magnets. Peripheral magnets are positioned around the casing of the energy harvester to create multiple stable positions. Upon external vibration, kinetic energy is converted into electric energy that is extracted using a coil wrapped around the casing of the harvester. A prototype of the multi-stable energy harvester is fabricated. Monostable and bistable configurations are demonstrated and fully characterized in static and dynamic modes. Compared to traditional multi-stable designs the harvester introduced in this work is compact, occupies less volume, and does not require complex circuitry normally needed for multi-stable harvesters involving piezoelectric elements. At 2.5g [m/s2], results from experiment show that the bistable harvester does not outperform the monostable harvester. At this level of acceleration, the bistable harvester exhibits intrawell motion away from jump frequency. Chaotic motion is observed in the bistable harvester when excited close to jump frequency. Interwell motion that yields high displacement amplitudes and velocities is absent at this acceleration.

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An efficient low-frequency acoustic energy harvester

Sensors and Actuators A Physical ◽

10.1016/j.sna.2017.07.051 ◽

2017 ◽

Vol 264 ◽

pp. 84-89 ◽

Cited By ~ 25

Author(s):

Ming Yuan ◽

Ziping Cao ◽

Jun Luo ◽

Jinya Zhang ◽

Cheng Chang

Keyword(s):

Energy Harvester ◽

Low Frequency ◽

Acoustic Energy

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Liquid encapsulated electrostatic energy harvester for low-frequency vibrations

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x12459590 ◽

2012 ◽

Vol 24 (1) ◽

pp. 61-69 ◽

Cited By ~ 17

Author(s):

Ling Bu ◽

Xiaoming Wu ◽

Xiaohong Wang ◽

Litian Liu

Keyword(s):

Polyvinylidene Fluoride ◽

Output Voltage ◽

Energy Harvester ◽

Low Frequency ◽

Electrostatic Energy ◽

Maximum Output ◽

Flowing Liquid ◽

Horizontal Vibration ◽

Low Viscosity ◽

High Relative Permittivity

This article presents the modeling, fabrication, and testing of liquid encapsulated energy harvester using polyvinylidene fluoride electrets. Unlike harvesters reported in previous literature, this liquid encapsulated energy harvester uses flowing liquid rather than conventional resonating structures to induce variable capacitance and is more suitable for low-frequency applications. Prototypes injected with three types of liquid ( N-methyl-2-pyrrolidone, N, N-dimethylformamide, and glycerin) are tested in horizontal vibration and rotary motion mode, respectively. The results show that N, N-dimethylformamide–injected prototypes display the most desirable performance in horizontal vibration testing at 1–10 Hz due to high relative permittivity and low viscosity, with maximum output voltage of 2.32 V and power of 0.18 µW at 10 Hz. Glycerin-injected prototypes perform best at 0.1–1 Hz rotation due to effective movement and highest permittivity, with maximum output voltage of 11.46 V and power of 2.19 µW at 1 Hz.

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Design Optimization of Low Power and Low Frequency Vibration Based MEMS Energy Harvester

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.475-476.1624 ◽

2013 ◽

Vol 475-476 ◽

pp. 1624-1628

Author(s):

Hasnizah Aris ◽

David Fitrio ◽

Jack Singh

Keyword(s):

Low Power ◽

Energy Harvester ◽

Piezoelectric Materials ◽

Geometry Optimization ◽

Low Frequency ◽

Substrate Thickness ◽

Power Harvesting ◽

Low Frequency Vibration ◽

Length Width ◽

Development And Utilization

The development and utilization of different structural materials, optimization of the cantilever geometry and power harvesting circuit are the most commonly methods used to increase the power density of MEMS energy harvester. This paper discusses the cantilever geometry optimization process of low power and low frequency of bimorph MEMS energy harvester. Three piezoelectric materials, ZnO, AlN and PZT are deposited on top and bottom of the cantilever Si substrate. This study focuses on the optimization of the cantilevers length, width, substrate thickness and PZe thickness in order to achieve lower than 600 Hz of resonant frequency. The harvested power for this work is in the range of 0.02 ~ 194.49 nW.

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