Analysis Model for Magnetic Energy Harvesters

Moon, Jinyeong; Leeb, Steven B.

doi:10.1109/tpel.2014.2357448

Cited by 57 publications

(43 citation statements)

References 29 publications

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“…The magnetic permeability of the saturated magnetic core is close to zero; this can cause power performance degradation due to such factors as insufficient induced voltage and power density. There have been several attempts to enhance the power density of magnetic energy harvesters, [9][10][11][12][13][14][15][16][17][18] but most of these attempts have not taken into account the effect of permeability variation, which is dependent on the geometrical parameters of the magnetic core and the magnetic field intensity. Assuming that permeability has a constant value at all locations of the magnetic core, regardless of the distance from the center of the power line, aspects of power performance like induced voltage of the magnetic core will be highly inaccurate.…”

Section: Introductionmentioning

confidence: 99%

Optimization design of toroidal core for magnetic energy harvesting near power line by considering saturation effect

et al. 2018

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Recently, magnetic energy harvesting technologies have been studied actively for self-sustainable operation of applications around power line. However, magnetic energy harvesting around power lines has the problem of magnetic saturation, which can cause power performance degradation of the harvester. In this paper, optimal design of a toroidal core for magnetic energy harvesters has been proposed with consideration of magnetic saturation near power lines. Using Permeability-H curve and Ampere’s circuital law, the optimum dimensional parameters needed to generate induced voltage were analyzed via calculation and simulation. To reflect a real environment, we consider the nonlinear characteristic of the magnetic core material and supply current through a 3-phase distribution panel used in the industry. The effectiveness of the proposed design methodology is verified by experiments in a power distribution panel and takes 60.9 V from power line current of 60 A at 60 Hz.

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Section: Introductionmentioning

confidence: 99%

Optimization design of toroidal core for magnetic energy harvesting near power line by considering saturation effect

et al. 2018

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“…The detailed analysis on magnetic saturation and its importance in the scope of electromagnetic energy harvesting can be referenced at [5] and [6]. The importance of magnetic saturation in energy harvesting can be briefly explained in two ways: first, if the magnetic core is not saturated, the load voltage can be always increased until the core saturates, directly increasing the energy extraction (since it is a currentdriven transformer, the harvested current does not change until saturation); second, if the magnetic core is not saturated, the number of turns on the secondary side can be lowered until the core saturates, directly increasing the harvested current (hence energy extraction).…”

Section: A Energy Harvestermentioning

confidence: 99%

“…This paper presents a nonintrusive and self-powered embedded system and an associated performance analysis method for condition monitoring of electromechanical machinery. This embedded system is designed for installation inside the terminal block of a typical motor or generator and harvests power from the magnetic field emanating from a currentcarrying wire of the electromechanical load under monitoring [5], [6]. The energy harvester powers the sensor package, consisted of low-power microcontrollers and sensors, e.g.…”

Section: Introductionmentioning

confidence: 99%

A nonintrusive magnetically self-powered vibration sensor for automated condition monitoring of electromechanical machines

Moon

Lindahl

Donnal

et al. 2016

2016 Ieee Autotestcon

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Abstract-This paper presents a nonintrusive and electromagnetically self-powered embedded system with vibration sensor for condition monitoring of electromechanical machinery. This system can be installed inside the terminal block of a motor or generator and supports wireless communication for transferring data to a mobile device or computer for subsequent performance analysis. As an initial application, the sensor package is configured for automated condition monitoring of resiliently mounted machines. Upon detecting a spin-down event, e.g. a motor turnoff, the system collects and transmits vibration and residual backemf data as the rotor decreases in rotational speed. This data is then processed to generate an empirical vibrational transfer function (eVTF) rich in condition information for detecting and differentiating machinery and vibrational mount pathologies. The utility of this system is demonstrated via lab-based tests of a resiliently mounted 1.1 kW three-phase induction motor, with results showcasing the usefulness of the embedded system for condition monitoring.

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“…To validate and verify the design of energy harvester circuits using any of these methods, it is convenient to have an analytical model of the highly nonlinear magnetic core. This paper therefore begins with the development of a "circuitfriendly" core model based on the analytical model presented in [1]. The model will be shown to have excellent prediction on power harvest, and will be used to design and evaluate demonstrations of the harvesting techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis in [1] involves two load types: resistive loads and constant voltage loads. The resistive load model is simple and illustrative of core behaviors, but not appropriate for a magnetic energy harvester, especially when the load is a DC-DC converter or a supercapacitor powering a sensor suite.…”

Section: Introductionmentioning

confidence: 99%

Power Electronic Circuits for Magnetic Energy Harvesters

Moon

Leeb

2016

IEEE Trans. Power Electron.

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Compared to many other energy harvesting schemes, harvesting energy from magnetic fields offers potential advantages for energy extraction and sensing. A magnetic energy harvester provides great flexibility for sensors and monitoring applications for condition-based monitoring of electromagnetic actuators, including vibration and thermal monitoring. A core must be managed or operated with carefully timed saturation to ensure maximum power extraction, a complex problem given the nonlinear saturation characteristics of a magnetic core [1]. This paper presents a simulator-friendly "circuit model" for a magnetic core, and uses this model to design and demonstrate several power electronic circuit solutions for harvesting energy. The circuit model has an excellent accuracy to represent the core regardless of the level of saturation. The design techniques to enhance power harvest are proposed, and verified through simulation and experiments, substantially boosting the amount of power harvest.

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Analysis Model for Magnetic Energy Harvesters

Cited by 57 publications

References 29 publications

Optimization design of toroidal core for magnetic energy harvesting near power line by considering saturation effect

Optimization design of toroidal core for magnetic energy harvesting near power line by considering saturation effect

A nonintrusive magnetically self-powered vibration sensor for automated condition monitoring of electromechanical machines

Power Electronic Circuits for Magnetic Energy Harvesters

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