Hand-held piezoelectric energy harvesting structure: Design, dynamic analysis, and experimental validation

This research proposes a hand-held piezoelectric energy-harvesting structure for portable human-motion energy harvesting. The proposed structure is composed of a square support frame with two hand shanks, a rotation disk with four identical rectangular permanent magnets, and a 33-Mode piezoelectric patch with a rectangular permanent magnet attached. Piezoelectric materials with good d₃₃ piezoelectric properties and high rigidity can be applied to the proposed structure. The dynamic changes of the proposed structure in the electric and magnetic fields during rotation are simulated and analyzed in detail. Treadmill experiments were also conducted to validate the simulation results. The results showed that the maximum peak-to-peak alternating piezoelectric voltage yields 3.5 V at 8 km/h and 0 degrees. Within 6.7 min, the 100 μF capacitor can be charged to 1.2 V, and the corresponding average power is equal to 0.18 μW at 6 km/h and 0 degrees.