Triboelectric-Electromagnetic Hybrid Energy Nanogenerator with Variable-Frequency Effect Inspired by Magnetic Gears for Efficient Use of Low-Speed Flow Energy

In the macrocontext of a low-carbon and energy-efficient economy, the rise of new energy vehicles is expected to replace traditional fuel vehicles. However, with the increasing number of new energy vehicles, the source of electricity for charging facilities faces new challenges. This study proposes a triboelectric-electromagnetic energy hybrid nanogenerator (VF-TEMG) with a variable-frequency effect inspired by an axial magnetic gear. The unit consists of one triboelectric nanogenerator (TENG) unit and two electromagnetic generator (EMG) units. The TENG unit employs a ternary dielectric structure to achieve kilovoltage output and reduce torque. Moreover, charging efficiency is enhanced using a mixture of high voltage from the TENG and EMG high current. Using the magnetic field modulation principle, the magnetic poles, which are produced by the low-speed rotor permanent magnets, are modulated by a pole-modulating piece into a magnetic pole harmonic equal to the number of pairs of high-speed rotor permanent magnets. Consequently, when the low-speed rotor starts to rotate, it drives the high-speed rotor to rotate at high speed, thereby achieving variable-frequency motion. This work establishes the theoretical and experimental basis for harvesting and effectively utilizing green energy based on frequency conversion. This study proposes a triboelectric-electromagnetic energy hybrid nanogenerator with a variable-frequency effect inspired by an axial magnetic gear. The charging rate increases by combining the high voltage of the TENG unit with the high current of the electromagnetic generator unit. In addition, the range of energy harvested by the triboelectric nanogenerator based on frequency conversion strategies is broadened.image (c) 2024 WILEY-VCH GmbH