A vibration‐based electromagnetic and piezoelectric hybrid energy harvester,International Journal of Energy Research |
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A vibration‐based electromagnetic and piezoelectric hybrid energy harvester,International Journal of Energy Research
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This work presents the fabrication and testing of a vibration‐based single energy hybrid harvester (VSEHH). Electromagnetic and piezoelectric transduction mechanisms are utilized for energy extraction in the developed harvester. Electromagnetic portion of the device composed of a permanent magnet, planar coil and wound coil, however, for piezoelectric portion polyvinylidene difluoride (PVDF) membrane is used. In the harvester the PVDF membrane having the magnet is kept loose in order to exploit the spring softening nonlinearity. At lower base excitation levels (less than 0.5g) the response of the VSEHH is linear, however, from 0.5 to 2.5g the harvester exhibits spring softening nonlinearity and at acceleration levels greater than 2.5g, the spring hardening nonlinearity is invoked. Because of nonlinear behavior of the harvester, the shift of resonant frequency, the sudden jump‐up and jump‐down phenomena result in the enhancement of the harvester's frequency bandwidth. Under sinusoidal excitation and at 123 Hz frequency and 4g acceleration, the electromagnetic portion of the harvester produced 40.6 mV load voltage and 212.7 μW with planar coil and 73.5 mV load voltage and 319.1 μW power with wound coil. Moreover, under the same vibrations condition a load voltage of 2930 mV and power of 57.6 μW is generated by the piezoelectric portion of the harvester. Collectively, the harvester is capable of producing a power of 589.4 μW and a power density of 334.13 μW/cm3. Furthermore, when subjected to broadband random vibrations, two central frequency peaks are produced, one is due to spring softening and the other corresponds to the spring hardening of the membrane.
中文翻译：
这项工作介绍了基于振动的单能量混合收割机（VSEHH）的制造和测试。电磁和压电换能机制用于发达的收割机中的能量提取。装置的电磁部分由永磁体，平面线圈和绕制线圈组成，但对于压电部分，则使用聚偏二氟乙烯（PVDF）膜。在收割机中，具有磁铁的PVDF膜保持松弛，以便利用弹簧软化非线性。在较低的基本激励水平（小于0.5 g）下，VSEHH的响应是线性的，但是，从0.5到2.5 g，收割机表现出弹簧软化非线性，并且在加速度水平大于2.5 g时，则调用弹簧硬化非线性。由于收割机的非线性行为，谐振频率的偏移，突然的跳升和跳下现象导致收割机频率带宽的增强。在正弦激励下，在123 Hz频率和4 g加速度下，收割机的电磁部分使用平面线圈产生40.6 mV的负载电压和212.7μW，使用绕线线圈产生73.5 mV的负载电压和319.1μW功率。此外，在相同的振动条件下，收割机的压电部分会产生2930 mV的负载电压和57.6μW的功率。总体而言，该收割机能够产生589.4μW的功率和334.13μW/ cm 3的功率密度。此外，当受到宽带随机振动时，会产生两个中心频率峰值，一个是由于弹簧软化，另一个是对应于膜的弹簧硬化。 |
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