Design of Electromagnetic Vibration Power Generation Based on Spring Amplitude Amplification

Abstract

For new energy vibration power generation, this paper proposed an electromagnetic vibration energy harvesting device that uses a spring to increase the amplitude. In order to improve the energy harvesting efficiency, this paper used the motor electromagnetic model and the mass-spring-damping vibration model to model and analyze the output voltage of energy harvesting device. For the sample working condition of vibration frequency of 15 Hz and amplitude of 1 mm, the optimal design of the spring amplitude amplification mechanism was carried out. According to the optimization results, Solid-Works software was used to model the spring amplitude amplification mechanism. In addition, the model was imported into ANSYS software for finite element analysis to evaluate the rationality and feasibility of the design scheme of the amplitude amplification mechanism. Finally, a prototype was made and a vibration power generation experimental platform was built to verify the prototype. The experimental results show that the design scheme in this paper amplifies the amplitude of the mover by 7.98 times, the no-load voltage reaches 22.8 V, and the maximum output power is 0.44 W, which better realizes the vibration energy collection. In order to make the device can be applied to a wider range of fields, the effectiveness of the designed device and the proposed method was further verified by using three different frequency working pairs.

Keywords

• vibration energy harvesting
• spring
• optimization
• finite element
• vibration power generation