A Linear Generator Powered from Bridge Vibrations for Wireless Sensors

A linear generator harvests which bridge vibration energy is used as the power source for a 3.3 V supply for the wireless sensor. Because of its ironless structure, the generator must be designed using the finite element method (FEM). The prime mover's mass and spring stiffness are analyzed with the vibration energy of the bridge. The linear generator's model is built in FEM package. The dynamic voltage with time produced by the generator is obtained with a transient electromagnetic field analysis. Finally, the experimental results of the linear generator are shown at different frequencies and displacements.