Experimental Study of Magnetic Force Direction Variation on the Efficiency Effects of the Piezoelectric-Based Energy Harvesting Mechanism

The development of wireless and microelectronics technology has led to wearable devices where power can be supplied by batteries as well as energy harvesting devices. Despite the advancements made by low-power microdevice technology, the power requirements to apply them are still difficult to find. For this reason, developing new energy harvesting techniques is necessary to maintain self-powered systems. Energy harvesters are also needed as an economically practical alternative to battery charging and reducing greenhouse gas emissions and preserving the environment. One of them is by using piezoelectric-based energy harvester techniques by utilizing rotation. The purpose of this study is to examine the influence of magnetic force direction on the voltage and efficiency produced by piezoelectric-based energy harvester mechanisms using magnetic lighters. In this study, there are two variations of magnetic circuits, the first is that the magnetic circuit is regulated to repel each other (Type A), and the second is the magnetic circuit is regulated by mutual attraction and repulsion (Type B). Data collection is carried out on an energy harvesting mechanism whose piezoelectricity amounts to 4 pieces with a variation of 1000 rpm. The efficiency produced by the Type A magnetic circuit is 0.278% with a resistance of 9780 ohms. The resulting efficiency of the Type B magnetic circuit is 0.460% with a resistance of 9760 rpm. The application of piezoelectric-based energy harvesting mechanisms is more effective when using Type B magnetic circuits.