Abstract
The power supply method of low-power sensors has partly restricted the exploration and utilization of marine resources. Low-density wave energy can be harvested and used to power low-power wireless sensor devices and promote the coordinated development of the marine environment. This paper designs a linear oscillating electromagnetic energy harvester with hollow spheres as buoys. Spherical buoys can provide resilience for the oscillating permanent magnet, which is sensitive to the wave vibration form. Under wave excitation with wide-amplitude and stochastic low-frequency distribution, the oscillating permanent magnet with intrinsic frequency of 1.1 Hz is forced to move reciprocally in the rolling slot. Multiple groups of induction coils used in series make the output voltage of the harvester more balanced and smooth, improving the conversion rate of wave energy. According to the experimental results, the harvester can generate a maximum output power of 18.4 mW and an average output power of 4.44 mW under the excitation of water waves with a maximum acceleration of 1.21 m/s2. The output power is sufficient for low-power wireless sensor devices.
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