Ferroelectric dipole electrets for output power enhancement in electrostatic vibration energy harvesters

2013 ◽  
Vol 103 (16) ◽  
pp. 162901 ◽  
Author(s):  
Haruhiko Asanuma ◽  
Hiroyuki Oguchi ◽  
Motoaki Hara ◽  
Ryo Yoshida ◽  
Hiroki Kuwano
Keyword(s):  
Output Power ◽  
Vibration Energy ◽  
Energy Harvesters ◽  
Power Enhancement

scholarly journals Output Power of Piezoelectric MEMS Vibration Energy Harvesters Under Random Oscillation

2019 ◽  
Vol 1407 ◽  
pp. 012082
Author(s):  
S Murakami ◽  
T Yoshimura ◽  
M Aramaki ◽  
Y Kanaoka ◽  
K Tsuda ◽  
...  
Keyword(s):  
Output Power ◽  
Vibration Energy ◽  
Random Oscillation ◽  
Energy Harvesters ◽  
Piezoelectric Mems

Temperature effects on output power of piezoelectric vibration energy harvesters

2011 ◽  
Vol 42 (8) ◽  
pp. 988-991 ◽  
Author(s):  
Seon-Bae Kim ◽  
Jung-Hyun Park ◽  
Hosang Ahn ◽  
Dan Liu ◽  
Dong-Joo Kim
Keyword(s):  
Output Power ◽  
Temperature Effects ◽  
Vibration Energy ◽  
Energy Harvesters ◽  
Piezoelectric Vibration

scholarly journals Topology Selection and Parametric Design of Electromagnetic Vibration Energy Harvesters by Combining FEA-in-the-Loop and Analytical Approaches

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 627 ◽  
Author(s):  
Seong-yeol Yoo ◽  
Young-Woo Park ◽  
Myounggyu Noh
Keyword(s):  
Output Power ◽  
Permanent Magnets ◽  
Energy Harvester ◽  
Maximum Output Power ◽  
Electromagnetic Energy ◽  
Vibration Energy ◽  
Maximum Output ◽  
Primary Concern ◽  
Energy Harvesters ◽  
Analytical Approaches

Electromagnetic energy harvesters have been used to capture low-frequency vibration energy of large machines such as diesel generators. The structure of an electromagnetic energy harvester is either planar or tubular. Past research efforts focus on optimally designing each structure separately. An objective comparison between the two structures is necessary in order to decide which structure is advantageous. When comparing the structures, the design variations such as magnetization patterns and the use of yokes must also be considered. In this study, extensive comparisons are made covering all possible topologies of an electromagnetic energy harvester. A bench mark harvester is defined and the parameters that produce maximum output power are identified for each topology. It is found that the tubular harvesters generally produce larger output power than the planar counterparts. The largest output power is generated by the tubular harvester with a Halbach magnetization pattern (94.7 mW). The second best is the tubular harvester with axial magnetization pattern (79.1 mW) when moving yokes are inserted between permanent magnets for flux concentration. When cost is of primary concern, the tubular harvester with axial pattern may become a best option.

scholarly journals Electrostatic MEMS Vibration Energy Harvesters inside of Tire Treads

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 890 ◽  
Author(s):  
Yasuyuki Naito ◽  
Keisuke Uenishi
Keyword(s):  
Output Power ◽  
High Efficiency ◽  
Vibration Energy ◽  
Sinusoidal Vibration ◽  
Vibration Energy Harvester ◽  
Energy Harvesters ◽  
Electrostatic Mems ◽  
Output Electrode ◽  
Harvest Impact ◽  
Impact Vibration

An electret electrostatic MEMS vibration energy harvester for tire sensors mounted inside of the tire tread is reported. The device was designed so as to linearly change an electrostatic capacitance between the corrugated electret and output electrode according to the displacement of the proof mass. The electromechanical linearity was effective at reducing the power loss. The output power reached 495 μW under sinusoidal vibration despite the footprint size being as small as 1 cm2. Under impact vibration inside of the tire tread, the output power reached 60 μW at a traveling speed of 60 km/h. It was revealed that a higher mechanical resonance frequency of the harvester adjusted within the frequency band of a low-power spectral density of impact vibration acceleration was effective for high efficiency harvest impact vibration energy.

scholarly journals Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters

2013 ◽  
Vol 80 (6) ◽  
Author(s):  
Sebastien Boisseau ◽  
Ghislain Despesse ◽  
Bouhadjar Ahmed Seddik
Keyword(s):  
Output Power ◽  
Mechanical Energy ◽  
Resonance Phenomenon ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Energy Harvesters ◽  
Nonlinear Springs ◽  
Working Frequency ◽  
Nonlinear Devices ◽  
Mass Spring

Vibration energy harvesting is an emerging technology aimed at turning mechanical energy from vibrations into electricity to power the microsystems of the future. Most current vibration energy harvesters (VEH) are based on a mass-spring structure: this introduces a resonance phenomenon that enables an increase of VEH output power (compared to nonresonant systems); however, the working frequency bandwidth is limited. Therefore, these devices are not able to harvest energy when ambient vibrations’ frequencies shift. To solve this problem and to increase the frequency band where power can be harvested, one solution consists in using nonlinear springs. This paper introduces H-shaped nonlinear springs, their model, and their benefits to improve VEH output powers. Simulations on real vibration sources show that the output power can be higher in nonlinear devices (up to +48%) compared to linear systems.

scholarly journals Design Optimization and Comparison of Cylindrical Electromagnetic Vibration Energy Harvesters

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7985
Author(s):  
Tra Nguyen Phan ◽  
Jesus Javier Aranda ◽  
Bengt Oelmann ◽  
Sebastian Bader
Keyword(s):  
Power Density ◽  
Output Power ◽  
Electromagnetic Coupling ◽  
Maximum Output Power ◽  
Optimization Procedure ◽  
Vibration Energy ◽  
Maximum Output ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Halbach Array

Investigating the coil–magnet structure plays a significant role in the design process of the electromagnetic energy harvester due to the effect on the harvester’s performance. In this paper, the performance of four different electromagnetic vibration energy harvesters with cylindrical shapes constrained in the same volume were under investigation. The utilized structures are (i) two opposite polarized magnets spaced by a mild steel; (ii) a Halbach array with three magnets and one coil; (iii) a Halbach array with five magnets and one coil; and (iv) a Halbach array with five magnets and three coils. We utilized a completely automatic optimization procedure with the help of an optimization algorithm implemented in Python, supported by simulations in ANSYS Maxwell and MATLAB Simulink to obtain the maximum output power for each configuration. The simulation results show that the Halbach array with three magnets and one coil is the best for configurations with the Halbach array. Additionally, among all configurations, the harvester with two opposing magnets provides the highest output power and volume power density, while the Halbach array with three magnets and one coil provides the highest mass power density. The paper also demonstrates limitations of using the electromagnetic coupling coefficient as a metric for harvester optimization, if the ultimate goal is maximization of output power.

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