Principle design and power generation research of magnetically coupled piezoelectric energy harvester

This study systematically investigates the mechanism of magnetic coupling energy collection and designs an efficient energy collector. The experimental results demonstrate that the strategic installation of permanent magnets can effectively optimize the stress state of piezoelectric plates, significantly enhancing power generation efficiency. Under identical conditions, the peak voltage of the newly developed magnetically coupled energy collector reaches 168.3 V, surpassing the 67.19 V peak voltage reported in the reference. Optimizing the operational speed from 550 to 180 rpm improves the energy collector’s compatibility with low-frequency external excitation. The study also compares and analyzes the power generation performance of various piezoelectric plates, revealing that the maximum power outputs of series and parallel circuits are 22.4 and 3.98 mW, respectively. This research introduces novel concepts and methodologies for optimizing the design of energy collector structures.