Electromagnetic generator for harvesting energy from human motion

Saha, Chinmoy; O’Donnell, Terence; Wang, N.; McCloskey, Paul

doi:10.1016/j.sna.2008.03.008

Cited by 524 publications

(274 citation statements)

References 7 publications

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“…Next, a unit vector ̂ (representing the sensitive direction of the harvester) is defined on this plane (10), (11), where ̂ is the unit vector along the y-axis and is the component of the unit vector ̂ in the z-axis.…”

Section: B the Effect Of Rotation In 2-dof Microgeneratorsmentioning

confidence: 99%

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Modeling the Effect of Orientation on Human-Powered Inertial Energy Harvesters

2015

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Abstract-A fundamental challenge in realizing body-worn sensors is in providing an effective and long-lasting power supply. Issues regarding batteries have prompted researchers to investigate powering devices by extracting energy from the inertial movement of the human body. While previous studies have investigated the effect of generator location and wearer activity on harvestable power, they have not considered the orientation of the generator; this is the focus of this paper. Acceleration data collected across a sample population (ten participants) during different activities (walking and running) and generator location (five locations on the body) are presented.These data are processed to analyze the effect of orientation, and we find that it can significantly reduce the harvestable power.Subsequently, we propose and analyze how two degree-offreedom generators can improve tolerance to rotation; results indicate that it can be improved by one order of magnitude.

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Section: B the Effect Of Rotation In 2-dof Microgeneratorsmentioning

confidence: 99%

“…Human-powered inertial microgenerators have been proposed in the literature [11] and, while some are designed to operate off-resonance [12], the majority are resonant systems.…”

mentioning

confidence: 99%

Modeling the Effect of Orientation on Human-Powered Inertial Energy Harvesters

2015

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“…Equation (2) reveals that the amplitude of magnet/mass vibration decays exponentially due to damping. As a result, the output voltage and generated power will also be exponentially decayed signals.…”

Section: System Design and Prototype Fabricationmentioning

confidence: 99%

“…Recently, energy harvesting from human motions has become a thrust for exploration. [2][3][4][5] Basic human activities (e.g., walking, running, shaking limbs, jumping, etc.) produce mechanical vibrations that can be converted to useful electrical energy by various transaction mechanisms such as electromagnetic, 5 piezoelectric, 6 and electrostatic 7 mechanisms.…”

mentioning

confidence: 99%

A non-resonant, frequency up-converted electromagnetic energy harvester from human-body-induced vibration for hand-held smart system applications

Halim

Park

2014

Journal of Applied Physics

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Energy-harvesting device with mechanical frequency-up conversion mechanism for increased power efficiency and wideband operation Applied Physics Letters 96, 111906 (2010) We present a non-resonant, frequency up-converted electromagnetic energy harvester that generates significant power from human-body-induced vibration, e.g., hand-shaking. Upon excitation, a freely movable non-magnetic ball within a cylinder periodically hits two magnets suspended on two helical compression springs located at either ends of the cylinder, allowing those to vibrate with higher frequencies. The device parameters have been designed based on the characteristics of human hand-shaking vibration. A prototype has been developed and tested both by vibration exciter (for non-resonance test) and by manual hand-shaking. The fabricated device generated 110 lW average power with 15.4 lW cm À3 average power density, while the energy harvester was mounted on a smart phone and was hand-shaken, indicating its ability in powering portable hand-held smart devices from low frequency (<5 Hz) vibrations.

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“…Theoretically, any kind of vibration source can be transformed into electric power [8]. There are three basic techniques for this kind of conversion: piezoelectric transducers-energy is induced by the deformation of piezoelectric materials, like PZT ceramics, PVDF films and piezoelectric composite fibers [9]; spring-mass electromagnetic transducers-energy is generated between a moving magnet and a coil based on Faraday's law [10][11][12]; and electrostatic transducers-energy is generated by charged vibrating capacitor electrodes [13,14].…”

Section: Introductionmentioning

confidence: 99%

Development of an Indoor Airflow Energy Harvesting System for Building Environment Monitoring

et al. 2014

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Wireless sensor networks (WSNs) have been widely used for intelligent building management applications. Typically, indoor environment parameters such as illumination, temperature, humidity and air quality are monitored and adjusted by an intelligent building management system. However, owing to the short life-span of the batteries used at the sensor nodes, the maintenance of such systems has been labor-intensive and time-consuming. This paper discusses a battery-less self-powering system that converts the mechanical energy from the airflow in ventilation ducts into electrical energy. The system uses a flutter energy conversion device (FECD) capable of working at low airflow speeds while installed on the ventilation ducts inside of buildings. A power management strategy implemented with a circuit system ensures sufficient power for driving commercial electronic devices. For instance, the power management circuit is capable of charging a 1 F super capacitor to 2 V under ventilation duct airflow speeds of less than 3 m/s.

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Electromagnetic generator for harvesting energy from human motion

Cited by 524 publications

References 7 publications

Modeling the Effect of Orientation on Human-Powered Inertial Energy Harvesters

Modeling the Effect of Orientation on Human-Powered Inertial Energy Harvesters

A non-resonant, frequency up-converted electromagnetic energy harvester from human-body-induced vibration for hand-held smart system applications

Development of an Indoor Airflow Energy Harvesting System for Building Environment Monitoring

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