Affiliations: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
Correspondence:
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Corresponding author: Renwen Chen, State Key Laboratory of Mechanics & Control of Mechanical Structures, Nanjing University of Aeronautics & Astronautics, 29 Yudao Street, Nanjing 210016, Jiangsu, China. E-mail:[email protected]
Abstract: A spherical electromagnetic energy harvester is designed
to harvest omni-directional kinetic energy. A novel spherical Halbach array
is proposed, which increases the magnetic field gradient in the coil
compared with the traditional permanent magnet array, to increase the output
performance. The parameter optimization of the spherical structure is
carried out in accordance with the analytical results of the corresponding
physical model. Finite element analysis and experimental performance test
are carried out on the prototype. Experimental results demonstrate that the
novel transducer can harvest kinetic energy in any direction, and then
transfer to electric power. When the excitation direction is horizontal with
frequency of 7.5 Hz, the load resistance is 3.2 Ω, the electric power
reaches its maximum value. The maximum load power of a single coil is
0.18 mW. It can meet the needs of some microelectronic devices and has the
potential to take the place of chemistry batteries and supply power to
wildlife monitoring and positioning systems.
Keywords: Kinetic energy harvesting, omni-directional, electromagnetic, spherical Halbach array
