Piezoelectric energy harvester scavenging AC magnetic field energy from electric power lines

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• 作者：Wei HeAuthor Vitae ; Ping Li ; ^{liping@cqu.edu.cn} ; ^{pingli@ucla.edu}Author Vitae ; Yumei WenAuthor Vitae ; Jitao ZhangAuthor Vitae ; Aichao YangAuthor Vitae ; Caijiang LuAuthor Vitae ; Jin YangAuthor Vitae ; Jing WenAuthor Vitae ; Jing QiuAuthor Vitae ; Yong ZhuAuthor Vitae ; Miao YuAuthor Vitae
• 关键词：Piezoelectric energy harvester ; AC magnetic field energy ; Electric power line ; Ampere's law ; Magnetic circuit ; Linstedt&ndash ; Poincaré ; method
• 刊名：Sensors and Actuators A: Physical
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：193
• 期：Complete
• 页码：59-68
• 全文大小：1116 K

文摘

This paper presents a piezoelectric energy harvester for scavenging AC magnetic field energy from an electric power line based on the Ampere's law. The harvester employs a piezoelectric cantilever beam with a magnetic circuit attached to the free end of the beam. The magnetic circuit uses three NdFeB magnets connected by two magnetic yokes in series, which produces an enhanced magnetic flux density on the power line. Consequently, more AC magnetic field energy from the current-carrying power line can be converted into electrical energy using the piezoelectric cantilever beam. In the theoretical analysis, the integral of the magnetic flux density produced by the magnetic circuit along the power line is expressed by a power series of the transverse displacement of the magnetic circuit, and a nonlinear modal equation of motion is derived. The equation is solved by the Linstedt-Poincar¨¦ method. The expressions of the steady-state output voltage and power are obtained based on the assumed model. The experimental results are in good agreement with the analytical results. Under the resonant frequency of 50 Hz, the harvester can generate a power of 1.58 mW with a matching load resistance of 216 k¦¸ at an AC current of 6 A.