Magnetotropic Hybrid Generator with Self‐Switching Mechanism for Long‐Term Forest Fire Prevention

Abstract

AbstractThe integration of triboelectric nanogenerator (TENG) with electromagnetic generator (EMG) holds promise for the efficient harvesting of broadband wind energy, yet the challenge of coupling these two systems into one high‐durability unit has persisted. Herein, a novel magnetic attraction coupling principle is proposed to enable seamless switching between TENG unit and EMG unit across varying rotation speeds without the need for additional mechanical components, thereby enhancing the energy harvesting efficiency of the magnetotropic hybrid generator (MHG). The rotating magnetic field induces the Si‐Mn steel plates to operate in a contact‐separation mode within a compact space, producing a 270 V open‐circuit voltage output, while the excess magnetic flux is captured by coils to generate an induced current of 5 mA. Most importantly, the overall structure is free from mechanical wear, maintaining consistent performance after 130 000 cycles. The harvested wind energy by MHG is utilized to power human infrared sensors, flame sensors, and Bluetooth hygrometers, providing a long‐term, stable power supply for forest fire early warning systems. This study pioneers a novel and robust mechanism that effectively combines TENG and EMG using magnetotropic property, opening a new avenue for efficiently harvesting wide‐band mechanical energy.