Abstract
In this paper, a frequency-adjustable tuning fork electromagnetic energy harvester is introduced. The electromagnetic vibration energy harvester can adjust its natural frequency according to a change in the environmental excitation frequency without any change to the structure. In the frequency-adjustable range, it can make the energy harvester resonant with the environment excitation, and the output frequency stays the same. The frequency-adjustable tuning fork electromagnetic energy harvester significantly increases the range of frequencies used. The operating frequency of the centre can be easily switched from 9.2 to 20 Hz, enabling the application of multiple excitation frequencies. In addition, the output power and power density are significantly increased compared to a piezoelectric tuning fork energy harvester of the same size. The peak power is 23.59 mW at 9.2 Hz, the power increases by 14.85 mW, and the power density increases by 169.88%. The experimental results show that the electromagnetic tuning fork frequency-adjustable conversion energy harvester can make the LED lamp work.
Highlights
In recent years, the use of environmental vibration power generation has become favoured, and it is a very promising power supply method [1–5]
The tuning fork electromagnetic energy harvester is mainly composed of a tuning fork structure, adjust screw, coil, magnet and fixed support
If k a is much smaller than k, the tuning fork structure first performs low-frequency forced vibration according to in-phase vibration mode to capture and accumulate environmental energy, and performs high-frequency free attenuation vibration through shock excitation of the antiphase vibration mode of the tuning fork, and converts the captured energy into power generation by using the relative motion of the magnet and coil
Summary
The use of environmental vibration power generation has become favoured, and it is a very promising power supply method [1–5]. Wu et al [30] proposed a tuning-fork-type piezoelectric energy harvester, which realized the function of the self-frequency conversion of a single structure and simplified the structure. A frequency conversion electromagnetic energy harvester with an adjustable tuning fork is proposed. Adjusting the frequency makes the energy harvester tolerant of different environmental vibration frequencies, and the power generation frequency of the energy harvester can still generate power at a fixed high frequency, which ensures the stability of the output frequency of the energy harvester and reduces the influence on electrical equipment. Due to electromagnetic and piezoelectric power generation, the relative internal resistance is much smaller, reducing the impact on the output power. The tuning fork frequency-conversion electromagnetic energy harvester has the advantage of low internal resistance and high power. The results are consistent with each other, and the influence law of load resistance on structural vibration is clarified
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