Investigation of two-degree-of-freedom cylindrical electromagnetic energy harvesters. (September 2019)

• Record Type: Journal Article
• Authors: Fan, K Q; Zhang, Y W; Liang, G
• Is Part Of: IOP conference series. Volume 531(2019)
• Publication Date: 2019-09
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/531/1/012019
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Harvesting energy from ambient excitations with broad spectrum of frequencies is still an open problem. We present in this paper three 2-degree-of-freedom (2-DOF) electromagnetic energy harvesters (EMEHs) to achieve broadband energy harvesting with adjustable bandwidth. The 2-DOF EMEHs are realized via suspending a 1-DOF cylindrical EMEH in a larger tube. The 2-DOF as well as the 1-DOF EMEHs are modeled, and the theoretical models have been validated by frequency sweeps performed by experiment. The parametric investigation indicates that the 2-DOF EMEHs have higher power output and wider working bandwidth than the 1-DOF EMEH. Among the three proposed 2-DOF EMEHs, employing two sets of coils to develop the movement of the two magnets affixed at the two ends of the 1-DOF EMEH's cylindrical housing is more favored as it can provide the highest power level and adjustable closeness between the first and second power peaks.