关键词: 压电, 俘能器, 错位激励, 旋转磁铁

Abstract: To avoid the mutual impacts between the exciting magnet and that on the end of piezo-cantilever, a piezoelectric harvester excited by malposed rotary magnets was presented. Simulation and analysis of the magnetic coupling characteristics of the malposed magnets were carried out. The influences of rotary-speed/exciting-distance/proof-mass on energy generation performance were tested. The results show that the piezoelectric harvester excited by malposition magnets is feasible. There are multiple optimal rotary speeds for the generated voltage to achieve peak. Radial exciting distance exerts no influence on the optimal speeds, but great influence on the peak voltage. There are different positive/negative exciting distances for output voltages to achieve peak. The proof mass and the number of exciting magnets have great influences on the performance of the energy harvester. With the increasing of proof mass, the optimal rotary speeds of each order decrease, and the relative peak voltage increases. The orders of optimal speeds, the values of the optimal speeds, and the relative peak voltage decrease with the increasing of the number of exciting magnets.

Key words: piezoelectric, harvester, malposed excitation, rotary magnet