A rotary electromagnetic microgenerator for energy harvesting from human motions

Niroomand, Mehdi; Foroughi, Hamid

doi:10.1016/j.jart.2016.06.002

Cited by 41 publications

(15 citation statements)

References 21 publications

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“…45 The resemblance of both prototypes with multiple field exciters machines and boosters 14 is the similarity in the series connection, allowing voltage and rotating speed fluctuations with the possibility of charging batteries with a small emf. However, the structure of the energy harvesting systems is novel and especially efficient in the functions for which they were designed for renewable energies.…”

Section: Discussionmentioning

confidence: 99%

“…The prototypes differ from other suggested models in the way the coils interact with several NdFeB magnets. 45 The resemblance of both prototypes with multiple field exciters machines and boosters 14 is the similarity in the series connection, allowing voltage and rotating speed fluctuations with the possibility of charging batteries with a small emf. According to the number of turns of the windings, the prototypes present output voltage proportional to the field flux, as the Rototrol 19 and Regulex 20 generators do, also the structure of the prototypes A and B with the homopolar dynamo to generate electricity by using only one pole.…”

Section: Discussionmentioning

confidence: 99%

“…The combination of AC and DC generators is being also made for wind power generation. 43 Nevertheless, 2 projects similar to the core shape of prototypes A and B are as follows: a system gear to make a DC motor run from vertical motion and store up energy in a supercapacitor 44 and a wheel spinning with several NdFeB magnets, 45 using rotational mechanical force to generate energy. However, generators based on cheaper fuels like naphtha generate 2 kW consuming 2.7 L/h.…”

Section: Other Projects Based On Energy Generationmentioning

confidence: 99%

“…Another project involving different numbers of turns in the 2 sets of armature windings and a doubly fed, 3-phase, doubly salient electromagnetic generator harvests over 119.44 V and 7 A. 43 Nevertheless, 2 projects similar to the core shape of prototypes A and B are as follows: a system gear to make a DC motor run from vertical motion and store up energy in a supercapacitor 44 and a wheel spinning with several NdFeB magnets, 45 using rotational mechanical force to generate energy. How well they function depends on the use they are set up to and the environment in which they work.…”

Section: Other Projects Based On Energy Generationmentioning

confidence: 99%

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A new configuration of 2 electromagnetic power generators for mechanical energy conversion by spinning a ferrite magnet in flat form

2017

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Summary Two electromagnetic power generators were designed and built with the purpose of creating a safe, noncarbon emitting, and long‐lasting source of energy. Prototype A has 20 coils and B has 10 coils. Each one has 2 flywheels, a second‐hand ferrite magnet that spins over the horizontal plane (lateral axis), and neodymium magnets (NdFeB). A literature review is provided covering the origins of the first direct current generators up to the most widely used contemporary alternating current power generators, comparing them with both prototypes. These were compared with each other to determine which performs better by making mathematical projections and checking them experimentally. The prototypes are based on an innovative configuration for mechanical energy conversion, which supplies power every time the system is in motion. The harvested energy has shown results—in terms of output power, power density, and specific power—which depend on several factors, such as the mechanical force induced and the period of time they remain spinning by the flywheels. The different parameters of the systems, which include connections, structure details, spinning plane, experimental results, and materials, are specified. Advantages and disadvantages are also analyzed, including some immediate real‐life applications. The designs have been improved by changing the shape of the coils and magnets as a whole to create enduring power systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Other Projects Based On Energy Generationmentioning

confidence: 99%

Section: Other Projects Based On Energy Generationmentioning

confidence: 99%

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A new configuration of 2 electromagnetic power generators for mechanical energy conversion by spinning a ferrite magnet in flat form

2017

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“…The output from this piston and crank setup is amplified accordingly to provide the input to the machine model. The DC machine model [10] is as shown in Figure 4. -------(4) The back emf generated from the angular velocity 'ω' due to the torque generated from the piston and crank setup connected to the knee.…”

Section: Figure 3:piston and Crank Actionmentioning

confidence: 99%

Simulation of Gait Based Wearable Energy Harvesting using Human Movement

V.*,

Jayaramaiah

2020

IJITEE

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The portability of power for human health monitoring is considered a challenge for years to come and the recent development in wearable devices has encouraged this research area. This paper develops a composite energy harvesting paradigm that combines piezoelectricity and electromechanical energy production to energize the storage batteries powering wearable devices. A composite mathematical model that combines the piezoelectric process along with the electromechanical process comprising the piston action is developed using MatlabTM. The piezoelectric power is considered to be generated from the pressure created by human weight on it while walking and electromechanical power generated from the limb movement of the human being. The energy thus harvested from both these inputs are consolidated and fed to charge the batteries that feed the wearable sensors. The Lithium-Ion battery of 1.2V rated voltage is charged using the power generated from the mathematical models of both the piezoelectric and electromechanical power generation. The energy generated is found to be satisfactorily charging the battery.

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Comparison and Scaling Effects of Rotational Micro‐Generators using Electromagnetic and Piezoelectric Transduction

Yeatman

2018

Energy Tech

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Rotational energy is widely distributed or easily acquirable from other energy sources (fluid flow, machine operation or human motion) in many industrial and domestic scenarios. At small scales, power generation from such rotational ambient sources can enable many autonomous and self‐reliant sensing applications. In this paper, three typical types of micro‐generators (energy harvesters), namely electromagnetic (EMREHs), piezoelectric resonant (PRREHs) and piezoelectric non‐resonant rotational energy harvesters (PNRREHs) are discussed and compared in terms of device dimensions and operation frequencies. Theoretical models are established for each type to calculate maximum achievable output power as a function of device dimension and operating frequency. Using these theoretical models, scaling laws are established for each type to estimate the achievable output. The EMREHs have a strong scaling effect both on device dimension (as L5) and on operating frequency (as ω2), whereas the PNRREHs are less so (L2.5ω0.5). PRREHs have a narrow band‐width as resonant harvesters, and are ideal for cases where the excitation frequency is constant. This study provides a guideline for selection and design of rotational energy harvesters (REH) when the device dimension and operating frequency are defined. The proposed scaling laws offer a convenient method to estimate the harvester performance for different dimensions and operating frequencies.

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A rotary electromagnetic microgenerator for energy harvesting from human motions

Cited by 41 publications

References 21 publications

A new configuration of 2 electromagnetic power generators for mechanical energy conversion by spinning a ferrite magnet in flat form

A new configuration of 2 electromagnetic power generators for mechanical energy conversion by spinning a ferrite magnet in flat form

Simulation of Gait Based Wearable Energy Harvesting using Human Movement

Comparison and Scaling Effects of Rotational Micro‐Generators using Electromagnetic and Piezoelectric Transduction

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