The Study Of Hybrid Piezoelectric And Electromagnetic Harvester

With the rapid development of microelectronics manufacturing technology, wireless sensor networks and the emergence of various new low-power devices. Vibrational energy converted into electrical energy for low-power devices has became a research focus. Currently, the vibration energy harvester mainly based on piezoelectric, electromagnetic and electrostatic. However, the electrostatic energy harvester requires an external power supply which greatly limits its application. In addition, piezoelectric energy harvester and electromagnetic energy harvester can not output large voltage and current at the same time. In order to overcome the drawbacks, researchers proposed the hybrid piezoelectric and electromagnetic energy harvester. In this paper, a new nonlinear hybrid piezoelectric and electromagnetic energy harvester will be presented after a depth study of the piezoelectric and electromagnetic energy harvester. It can effectively increase the working bandwidth and adjust the working frequency. The main work of the paper includes the following aspects:A new electromechanical coupling mathematical model for hybrid piezoelectric and electromagnetic energy harvester will be present, and the expressions of voltage,vibration amplitude and output power will be given. The effect of electrical parameters to the hybrid piezoelectric and electromagnetic energy harvester can be analyzed by the electromechanical coupling mathematical model.The output characteristics of the hybrid piezoelectric and electromagnetic energy harvester will be simulated by ANSYS and ANSOFT MAXWELL. The influence of the parameters of piezoelectric and electromagnetic unit to the output power of hybrid piezoelectric and electromagnetic energy harvester and the coupling effect between piezoelectric unit and electromagnetic unit will also be presented. The structure of hybrid piezoelectric and electromagnetic energy harvester will be optimized according to the results of simulation.Produce a hybrid piezoelectric and electromagnetic energy harvester and it will be compared with piezoelectric energy harvester and electromagnetic energy harvester. The experimental results show that the hybrid piezoelectric and electromagnetic energy harvester has a broaden 3db bandwidth, higher output power and wider applications.In view of the problems that hybrid piezoelectric and electromagnetic energy harvester’s working bandwidth is narrow and working frequency is fixed, we design a new nonlinear hybrid piezoelectric and electromagnetic energy harvester and compared with linear hybrid piezoelectric and electromagnetic energy harvester through experiment. The experimental results show that nonlinear hybrid piezoelectric and electromagnetic energy harvester improved the hybrid piezoelectric and electromagnetic energy harvester’s working bandwidth, the direction and magnitude of magnetic force have a significant impact to its performance.