Research On Pendulum Tunable Vibration Energy Harvesting Device

With the rapid development of MEMS technology,the size and power consumption of electronic devices are significantly reduced.Sensors,as the most common electronic devices in mechatronic systems,are often dispersed in a large amount in the environment to be monitored.When the power of the sensor comes from the battery,continuous power supply for a long time,and battery replacement under severe conditions are currently the main problems.In order to ensure the reliable operation of the electromechanical system,it is necessary to solve the problem of long-term,stable and continuous power supply of the wireless sensor network.Since wireless sensors are mostly composed of electrical components with low energy consumption,small micro-electric energy harvesting technology can meet the demand of electricity and is a feasible solution to solve the problem.Compared with other energy sources,vibration energy is more universal and stable,so vibration energy has broad development potential as an object of energy collectionIn this paper,a new tunable vibration energy harvesting device structure is designed.The pendulum vibration principle is used to make the natural frequency of the energy collecting device tunable,and the natural frequency is approximately linear with the adjusting parameter,which solves the difficulty of tuning the existing vibration energy collecting device.The problem,but also has the advantage of linear adjustment.In this paper,ANSYS Maxwell software is used to perform electromagnetic finite element analysis on tunable vibration energy harvesting device.The effect of structural parameter variation on the magnetic induction intensity of the coil is analyzed by static simulation.The influence of structural parameter variation on the induced electromotive force excited in the coil is analyzed by dynamic simulation.The vibration energy collection performance and collection of the device are improved and improved by optimizing the structural parameters.effectiveness.The tunable vibration energy harvesting device and the corresponding electrical energy storage circuit were designed and processed,and the device performance was experimentally tested.Experiments show that the natural frequency of the device can be linearly adjusted from 7 Hz to 13.5 Hz.When the number of turns of the coil is 300 and the winding width is 40 mm,the device can output a maximum induced electromotive force of 1.37V and an output maximum power of 521mW.After connecting to the energy storage circuit,it can output 3.4V DC voltage,and the stored energy can illuminate a LED.