Improvement of Output Power in Piezoelectric Energy Harvester under Magnetic Influence

In this paper, a method is proposed to improve the performance of the piezoelectric energy harvester by introducing the two magnets in the overall structure. One of the magnets is attached to the proof mass and the other one is used to create a magnetic field in the vicinity of the proof mass. The generated magnetic field develop a repulsive force between the magnet which improves the performance of the harvester in terms of the output voltage and output power. The proposed structure generates a peak voltage of 21.2 V at the resonant frequency of 95.5 Hz at an excitation acceleration of 1g. The peak output power of the proposed structure is 3.16 μW which is 7.11 % more than the simple rectangular structure of the same dimension.