Output Power Optimization for Electromagnetic Vibration Energy Harvesters

2010 ◽  
Author(s):  
M. S. M. Soliman ◽  
E. M. Abdel-Rahman ◽  
E. F. El-Saadany ◽  
R. R. Mansour
Keyword(s):  
Output Power ◽  
Power Flow ◽  
Analytical Form ◽  
Maximum Efficiency ◽  
Vibration Energy ◽  
Electrical Load ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Micropower Generators ◽  
Electrical Damping

In this work, we present a procedure to optimize the output power of electromagnetic vibration energy harvesters, or micropower generators (MPGs). The procedure is based on optimizing both the electrical damping coefficient and the coil configuration, wire gauge and number of turns, to maximize the power flow from the input mechanical source to the electrical load for different load values. Also, we present a closed analytical form for the maximum efficiency of the electromagnetic MPGs.

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.

Resin-bonded NdFeB micromagnets for integration into electromagnetic vibration energy harvesters

2013 ◽  
Vol 14 (4) ◽  
pp. 283-287 ◽  
Author(s):  
Pei-hong Wang ◽  
Kai Tao ◽  
Zhuo-qing Yang ◽  
Gui-fu Ding
Keyword(s):  
Vibration Energy ◽  
Energy Harvesters ◽  
Electromagnetic Vibration

scholarly journals Dynamic Modeling and Structural Optimization of a Bistable Electromagnetic Vibration Energy Harvester

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2410 ◽  
Author(s):  
Bei Zhang ◽  
Qichang Zhang ◽  
Wei Wang ◽  
Jianxin Han ◽  
Xiaoli Tang ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Magnetic Spring ◽  
Element Simulation ◽  
Nonlinear Galerkin Method ◽  
Simulation And Experiment ◽  
The Mathematical Model

A novel bistable electromagnetic vibration energy harvester (BEMH) is constructed and optimized in this study, based on a nonlinear system consisting mainly of a flexible membrane and a magnetic spring. A large-amplitude transverse vibration equation of the system is established with the general nonlinear geometry and magnetic force. Firstly, the mathematical model, considering the higher-order nonlinearities given by nonlinear Galerkin method, is applied to a membrane with a co-axial magnet mass and magnetic spring. Secondly, the steady vibration response of the membrane subjected to a harmonic base motion is obtained, and then the output power considering electromagnetic effect is analytically derived. On this basis, a parametric study in a broad frequency domain has been achieved for the BEMH with different radius ratios and membrane thicknesses. It is demonstrated that model predictions are both in close agreement with results from the finite element simulation and experiment data. Finally, the proposed efficient solution method is used to obtain an optimizing strategy for the design of multi-stable energy harvesters with the similar flexible structure.

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

Design and Comparison of Micro Electromagnetic Vibration Energy Harvesters

2015 ◽  
Vol 645-646 ◽  
pp. 1223-1232
Author(s):  
Yi Ming Lei ◽  
Zhi Yu Wen ◽  
Li Chen
Keyword(s):  
Energy Harvester ◽  
Load Resistance ◽  
Vibration Energy ◽  
Test Results ◽  
Peak Voltage ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Mems Technology ◽  
Electromagnetic Energy Harvesting ◽  
Linear Spring

This paper presents two electromagnetic vibration energy harvesters based on micro-electro-mechanical (MEMS) technology. Two prototypes with different vibration structures were designed and fabricated. The energy harvester includes a permanent magnet attached on vibration structure (resonator) made by Si and a fixed wire-wound coil, with the total volume of 0.9 cm3. Two energy harvesters with different resonator are tested and compared. Experiments show that: in the same acceleration and a load resistance, the resonant frequency of prototype B is approximately 95% of prototype A; The peak-peak voltage and the maximum power of prototype B is 1.6 times and 2.7 times of prototype A respectively. The test results was analyzed simply and it indicated that the electromagnetic energy harvesting with the spring B has better performance; also proved that the potential ability of the non-linear spring could extend the frequency bandwidth and improve output voltage.

Effects of nonconstant coupling through nonlinear magnetics in electromagnetic vibration energy harvesters

2012 ◽  
Vol 23 (13) ◽  
pp. 1533-1541 ◽  
Author(s):  
Clemens Cepnik ◽  
Eric M Yeatman ◽  
Ulrike Wallrabe
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Magnetic Fields ◽  
Vibration Amplitude ◽  
Homogeneous Magnetic Field ◽  
Vibration Energy ◽  
System Parameters ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
The Impact

This article discusses how a nonhomogeneous magnetic field with a nonconstant flux gradient affects the behavior of electromagnetic vibration energy harvesters. Based on simulations, the authors show that this nonlinearity enables to increase the output power and bandwidth but not to effectively limit the oscillator vibration amplitude. The impact, however, depends on various system parameters, especially the mechanical damping. Comparing the results to an energy-harvesting prototype, one can conclude that, in practice, the linear model based on a homogeneous magnetic field provides a good estimate. The authors finally give suggestions about magnetic fields that are beneficial for energy harvesting.

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