A nonlinear piezoelectric energy harvester with magnetic oscillator

This letter proposes a magnetic coupled piezoelectric energy harvester (PEH), in which the magnetic interaction is introduced by a magnetic oscillator. For comparison purpose, lumped parameter models are established for the conventional linear PEH, the nonlinear PEH with a fixed magnet, and the proposed PEH with a magnetic oscillator. Both experiment and simulation show the benefits from the dynamics of the magnetic oscillator. In the experiment, nearly 100 increase in the operating bandwidth and 41 increase in the magnitude of the power output are achieved at an excitation level of 2 m/s ².