Tiangong University

Pengfei Liu

Minghui Yao

Li Li Ma

Wei Xia

Ii Ma

The invention provides a piezoelectric electromagnetic combined energy harvester based on parallel mechanism. The harvester includes fixed bracket, three groups of motion branches and movable bracket. The movable bracket includes bottom platform, the bottom platform support frame and the bottom platform connector. The invention realizes multi-direction telescopic motion, and the magnetic flux of the coil is constantly changing, generating induced electromotive force. The vibration of piezoelectric beam causes the polarization of piezoelectric material and produces the output voltage. The invention uses parallel mechanism to introduce twelve piezoelectric beams, twelve permanent magnets and twenty-four coils in a small working space. The limited working space is fully utilized, and the combined working mode of piezoelectric energy collection technology and electromagnetic energy collection technology is adopted to make the overall power generation effect better, improve the power generation, and broaden the effective working bandwidth.

Piezoelectric electromagnetic composite energy harvester based on parallel mechanism

A four-sided-synchronous-swing dual-mode broadband power generation device, comprising a fixing frame, a piezoelectric beam swing mechanism, and electromagnetic induction power generators (). Four groups of straight piezoelectric beams () and L-shaped piezoelectric beams () are installed in a small space, therefore, a limited working space can be fully utilized, the working area can be reduced, and the requirements for development of a microelectromechanical system can be satisfied. Each L-shaped piezoelectric beam () comprises a horizontal beam and a vertical beam, so that vibration in two directions can be implemented, therefore, the dynamic behavior of piezoelectric cantilevers is enriched, and the power generation efficiency of the system is improved. The straight piezoelectric beams () and L-shaped piezoelectric beams () have different lengths, so that energy of different swing frequencies can be effectively harvested, and the effective working frequency bandwidth can be broadened. The adjacent straight piezoelectric beams (), L-shaped piezoelectric beams (), and electromagnetic induction power generators () constitute four groups of dual-mode piezoelectric electromagnetic composite power generation structures, effectively improving power generation. The four-sided-synchronous-swing dual-mode broadband power generation device can harvest energy inputted in the form of rotation from environment and currently can be applied to wind power generation, hydroelectric power generation, bicycle self-power supply, and other fields.

Growing community of inventors

Tianjin, China

Pengfei Liu