1A33 Improved Piezoelectric Energy Harvesting with Magnetically Enhanced Electro-Mechanical Coupling(The 12th International Conference on Motion and Vibration Control)

Abstract

This paper reports a new approach to improving the electro-mechanical coupling by stiffness compensation through negative force based on magnetic effects. Two sheets of permanent magnet are placed in the vicinity of a piezoelectric composite cantilever, and another permanent magnet bar is attached onto the beam with one end located between two sheets to form a monopole-like proof-mass. Analyses and experiments are carried out to demonstrate that a linear magnetic field yielding linear, negative force can be produced as beam vibrates, which results in the reduction of the effective stiffness of the piezoelectric cantilever and therefore the enhancement of its electro-mechanical coupling effect.