N2 - The paper is an exploration of the optimal design parameters of a space-constrained electromagnetic vibration-based generator. An electromagnetic energy harvester is composed of a coiled polyoxymethylen circular shell, a cylindrical NdFeB magnet, and a pair of helical springs. The magnet is vertically confined between the helical springs that serve as a vibrator. The electrical power connected to the coil is actuated when the energy harvester is vibrated by an external force causing the vibrator to periodically move through the coil. The primary factors of the electrical power generated from the energy harvester include a magnet, a spring, a coil, an excited frequency, an excited amplitude, and a design space. In order to obtain maximal electrical power during the excitation period, it is necessary to set the system’s natural frequency equal to the external forcing frequency. There are ten design factors of the energy harvester including the magnet diameter (Dm), the magnet height (Hm), the system damping ratio (ζsys), the spring diameter (Ds), the diameter of the spring wire (ds), the spring length (ℓs), the pitch of the spring (ps), the spring’s number of revolutions (Ns), the coil diameter (Dc), the diameter of the coil wire (dc), and the coil’s number of revolutions (Nc). Because of the mutual effects of the above factors, searching for the appropriate design parameters within a constrained space is complicated. Concerning their geometric allocation, the above ten design parameters are reduced to four (Dm, Hm, ζsys, and Nc). In order to search for optimal electrical power, the objective function of the electrical power is maximized by adjusting the four design parameters (Dm, Hm, ζsys, and Nc) via the simulated annealing method. Consequently, the optimal design parameters of Dm, Hm, ζsys, and Nc that produce maximum electrical power for an electromagnetic energy harvester are found.
L1 - http://journals.pan.pl/Content/101333/PDF/aoa-2016-0012.pdf
L2 - http://journals.pan.pl/Content/101333
PY - 2016
IS - No 1
EP - 131
DO - 10.1515/aoa-2016-0012
KW - spring
KW - harvester
KW - generator
KW - permanent magnet
KW - simulated annealing
KW - optimization
KW - buckling
KW - fatigue
A1 - Chiu, Min-Chie
A1 - Chang, Ying-Chun
A1 - Yeh, Long-Jyi
A1 - Chung, Chiu-Hung
PB - Committee on Acoustics PAS, PAS Institute of Fundamental Technological Research, Polish Acoustical Society
VL - vol. 41
DA - 2016
T1 - Numerical Assessment of a One-Mass Spring-Based ElectromagneticEnergy Harvester on a Vibrating Object
SP - 119
UR - http://journals.pan.pl/dlibra/publication/edition/101333
T2 - Archives of Acoustics