Micro electromagnetic vibration energy harvester based on free/impact motion for low frequency–large amplitude operation

2015 ◽  
Vol 224 ◽  
pp. 87-98 ◽  
Author(s):  
Ahmed Haroun ◽  
Ichiro Yamada ◽  
Shin’ichi Warisawa
Keyword(s):  
Large Amplitude ◽  
Energy Harvester ◽  
Low Frequency ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Electromagnetic Vibration ◽  
Impact Motion

Micro Electromagnetic Vibration Energy Harvester Based on Combined Free/Impact Motion for Low Frequency-Large Amplitude Operation

2017 ◽  
Author(s):  
Ahmed Haroun ◽  
Ichiro Yamada ◽  
Shinichi Warisawa
Keyword(s):  
Large Amplitude ◽  
Energy Harvester ◽  
Low Frequency ◽  
Vibration Energy ◽  
Vibration Source ◽  
Total Size ◽  
Vibration Energy Harvester ◽  
Significant Power ◽  
Electromagnetic Vibration ◽  
Impact Motion

This paper presents design, simulation, and experimentation of a novel Micro-electromagnetic vibration energy harvester based on free/impact motion. Power harvesting is simply achieved from relative oscillation between a permanent magnet allowed to move freely inside a tube-carrying electrical coil with two end stoppers and directly connected to the vibration source. The proposed harvester with free/impact motion shows a non-resonant behaviour in which the output power continuously increase with the input frequency and/or amplitude. In addition, the allowable free motion permits significant power scavenging at low frequencies. Hence, the proposed harvester is well suited for the applications involved variable large amplitude–low frequency vibrations such as human-powered devices. A nonlinear mathematical model of the proposed harvester including electromagnetic and impact characteristics is derived and used further for a case study model prediction. A unique way of oscillation is observed, in which four modes of magnet/tube relative motion appear over the range of exciting amplitudes and frequencies. Two experiments are conducted on different fabricated prototypes. The first shows the effect of different magnet shapes on the harvesting performance, and the second is carried out to investigate the performance of two different size prototypes with variable large amplitude-low frequency vibrations. A harvester with cylindrical total size of D9×L12 mm can generate RMS power of 71.8μW at (2.5 Hz and 5.2 m/s2), and 113.3μW at (3.33 Hz, and 12.38 m/s2). Another of D7×L12 mm size can generate RMS power of 28.4 μW at (2.5 Hz and 5.2 m/s2), and 82.9 μW at (3.33 Hz, and 12.38 m/s2). Comparison with some previously fabricated low frequency energy harvesters is made which shows the advantageous of the new harvester in size minimization as well as the significant power raise with the input amplitude.

A Novel Broadband Vibration Energy Harvester

2014 ◽  
Vol 644-650 ◽  
pp. 3560-3563
Author(s):  
Yu Liu ◽  
Xiao Yan He ◽  
Shen Liu ◽  
Ying Wu ◽  
Yi Ou
Keyword(s):  
Resonance Frequency ◽  
Energy Harvester ◽  
Engineering Application ◽  
Low Frequency ◽  
Structure Design ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Collector Efficiency ◽  
Energy Acquisition ◽  
Mode Energy

A single resonance frequency is the main factor of limiting vibration energy collector efficiency. In this paper, the multi degree of freedom oscillation adjusting bandwidth scheme is reported, designing a kind of new broadband vibration energy harvester, which has multi-mode energy acquisition, multi freedom vibration and broadband characteristics. Firstly, Broadband energy collector structure design. Secondly, Combining with the main vibration form, using the ANSYS carried out a detailed analysis of its working model. Finally, designing the prototype and doing some experimental verification, the results show that the designed energy collector with low frequency and wideband energy acquisition performance, the frequency domain of energy collection is 57.6 to 69.45HZ ,which break through the bottleneck of traditional single resonance frequency of energy acquisition, has a high value of theory and engineering application.

An electromagnetic vibration energy harvester using a magnet-array-based vibration-to-rotation conversion mechanism

2022 ◽  
Vol 253 ◽  
pp. 115146
Author(s):  
Yifeng Wang ◽  
Peigen Wang ◽  
Shoutai Li ◽  
Mingyuan Gao ◽  
Huajiang Ouyang ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester ◽  
Electromagnetic Vibration
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