A dual magnetic piezoelectric–electromagnetic hybrid energy harvester with enhanced output performance

Widespread mechanical energy in the environment can be converted to electrical energy using energy harvesting devices, providing a new option for powering sensing devices. A new piezoelectric–electromagnetic energy harvesting device is proposed in this paper, which achieves higher output power and broadens the prototype's operating bandwidth to a certain extent through the reasonable arrangement of magnetic poles and bilateral magnetic drive. Through experimental analysis and theoretical modeling, we have analyzed the influence of factors affecting the experimental output, such as magnet diameter, pole arrangement, and motor speed, etc. Load tests were conducted at 135 r/min. When the load is 6 KΩ, the maximum output power is 0.74 mW and stabilized voltage under load conditions is 5.08 V. A series of experiments proves the feasibility of the device, which provides a feasible solution for improving the efficiency of energy harvesting in the future.