Development and modeling of an electromagnetic energy harvester from pressure fluctuations

Ren, Hongliang; Wang, Tao

doi:10.1016/j.mechatronics.2017.11.008

Cited by 19 publications

(11 citation statements)

References 28 publications

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“…In addition, the flux density curves tend to be distorted from sinusoidal waveform with the increase of the radius. (12) where Rl is the load resistance, Rc and Lc are the coil resistance and the coil inductance of the electromagnetic energy harvester, and f is the frequency of alternating current. In general, the resistive effect due to the coil inductance is ignorable in comparison with the coil resistance.…”

Section: Parametric Analysismentioning

confidence: 99%

“…Figures 12 and 13 present the experimental and analytical curves of the output voltage and electrical power, varying with the load resistance respectively. The analytical results are based on Equations (11) and (12) where the resistive effect due to the coil inductance is reasonably neglected. In general, the analytical curves are in good accordance with the experimental curves.…”

Section: Under Loaded Conditionmentioning

confidence: 99%

“…Kinetic energy in fluid flow is a remarkable harvesting source which mainly comes in two forms, including gas flow and liquid flow. They can be easily found in the natural environment, industrial piping, and even the human body [12].…”

Section: Introductionmentioning

confidence: 99%

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Design, Analysis, and Evaluation of a Compact Electromagnetic Energy Harvester from Water Flow for Remote Sensors

Wang

Zhang

2018

Energies

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This paper develops an electromagnetic energy harvester, which can generate small-scale electricity from non-directional water flow in oceans or rivers for remote sensors. The energy harvester integrates a Tesla disk turbine, a miniature axial-flux permanent magnet generator, and a ring cover with symmetrical grooves which are utilized to rectify flow direction. A compact structure is achieved by mounting the permanent magnets of the generator directly on the end surfaces of the turbine rotor. Theoretical analysis is implemented to illustrate the energy conversion process between flow kinetic form and electrical form. Additionally, a mathematical model is developed to investigate the magnetic field distribution produced by the cubical permanent magnets as well as parametric effect. Plastic prototypes with a diameter of 65 mm and a height of 46 mm are fabricated by using a 3D printing technique. The effect of the groove angle is experimentally investigated and compared under a no-load condition. The prototype with the optimal groove angle can operate at flow velocity down to 0.61 m/s and can induce peak-to-peak electromotive force of 2.64-11.92 V at flow velocity of 0.61-1.87 m/s. It can be observed from the results that the analytical and the measured curves are in good accordance. Loaded experiments show that the output electrical power is 23.1 mW at flow velocity of 1.87 m/s when the load resistance is approximately equal to the coil resistance. The advantages and disadvantages of the proposed energy harvester are presented through comparison with existing similar devices.

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Section: Parametric Analysismentioning

confidence: 99%

Section: Under Loaded Conditionmentioning

confidence: 99%

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Design, Analysis, and Evaluation of a Compact Electromagnetic Energy Harvester from Water Flow for Remote Sensors

Wang

Zhang

2018

Energies

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“…However, the study does not investigate a suitable power conditioning solution under these conditions. Ren et al [ 15 ] reported an electromagnetic PFEH in a gas environment with pressure fluctuations of

bar at 20

, showing

and 2.0 mW of AC power at a resistive load. The system was designed for a static pressure of 1 bar.…”

Section: Introductionmentioning

confidence: 99%

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Aranda

Bader

Oelmann

2021

Sensors

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Condition monitoring devices in hydraulic systems that use batteries or require wired infrastructure have drawbacks that affect their installation, maintenance costs, and deployment flexibility. Energy harvesting technologies can serve as an alternative power supply for system loads, eliminating batteries and wiring requirements. Despite the interest in pressure fluctuation energy harvesters, few studies consider end-to-end implementations, especially for cases with low-amplitude pressure fluctuations. This generates a research gap regarding the practical amount of energy available to the load under these conditions, as well as interface circuit requirements and techniques for efficient energy conversion. In this paper, we present a self-powered sensor that integrates an energy harvester and a wireless sensing system. The energy harvester converts pressure fluctuations in hydraulic systems into electrical energy using an acoustic resonator, a piezoelectric stack, and an interface circuit. The prototype wireless sensor consists of an industrial pressure sensor and a low-power Bluetooth System-on-chip that samples and wirelessly transmits pressure data. We present a subsystem analysis and a full system implementation that considers hydraulic systems with pressure fluctuation amplitudes of less than 1 bar and frequencies of less than 300 Hz. The study examines the frequency response of the energy harvester, the performance of the interface circuit, and the advantages of using an active power improvement unit adapted for piezoelectric stacks. We show that the interface circuit used improves the performance of the energy harvester compared to previous similar studies, showing more power generation compared to the standard interface. Experimental measurements show that the self-powered sensor system can start up by harvesting energy from pressure fluctuations with amplitudes starting at 0.2 bar at 200 Hz. It can also sample and transmit sensor data at a rate of 100 Hz at 0.7 bar at 200 Hz. The system is implemented with off-the-shelf circuits.

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“…The abnormal opening of the PRV not only increases the energy loss through discharging the flow rate, but also The associate editor coordinating the review of this manuscript and approving it for publication was Tao Wang. shortens its service life by increasing the friction between the main spool and the seat. Numerous studies have reported the fundamental characteristics of the PRV [7]- [10], and pressure fluctuations [11], [12]. However, abnormal opening of the PRV has received minimal attention.…”

Section: Introductionmentioning

confidence: 99%

Effects of Structure Parameters on Abnormal Opening of Pilot-Operated Relief Valve Under Alternating Pressure

Hao

Liang

et al. 2019

IEEE Access

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Hydraulic vibration excitation has been widely regarded as a promising method of excitation because of its high power density and large output force. However, the alternating pressure in the hydraulic vibration exciter could cause the pilot-operated relief valve (PRV) to open abnormally, which presents a new challenge to the normal operation of the PRV. To determine the abnormal opening characteristics of the PRV under alternating pressure, the effects of structure parameters of the PRV (including diameters of orifices 1 and 2, volume of the pilot valve inlet, volume of the main valve spring chamber, area ratio of the main spool, and main spring pre-compression force and stiffness) on its abnormal opening displacement under alternating pressure were numerically investigated. The calculation results indicate that the abnormal opening of the PRV will be effectively decreased by appropriately increasing the diameter of orifice 1, decreasing the pilot valve inlet and main valve spring chamber volumes, and increasing the area ratio of the main spool and the main spring pre-compression force. The influence of the orifice 2 diameter on the abnormal opening of the PRV is dependent on the diameter range of orifice 1. The reasonable diameters of orifices 1 and 2 are in the range of 0.8-1.2 mm. The influence of the main valve spring chamber volume is more significant than the pilot valve inlet volume. The influence of the main spring stiffness is not significant. INDEX TERMSAlternating pressure, pilot-operated relief valve, abnormal opening, effects of structure parameters, hydraulic vibration excitation.

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Development and modeling of an electromagnetic energy harvester from pressure fluctuations

Cited by 19 publications

References 28 publications

Design, Analysis, and Evaluation of a Compact Electromagnetic Energy Harvester from Water Flow for Remote Sensors

Design, Analysis, and Evaluation of a Compact Electromagnetic Energy Harvester from Water Flow for Remote Sensors

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Effects of Structure Parameters on Abnormal Opening of Pilot-Operated Relief Valve Under Alternating Pressure

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