Airflow Energy Harvester Based on Diamagnetic Levitation Structure With Double Stabilizing Magnets

In this article, an airflow energy harvester based on a push–pull diamagnetic levitation structure with double stabilizing magnets is proposed to explore its energy harvesting efficiency and environmental adaptability. The static and dynamic mechanical characteristics of the floating magnet are studied. Then, three structure parameters resulting in the change of energy conversion factor (ECF) are analyzed using COMSOL software. A platform was constructed to carry out experiments, and the results are as follows. First, when both the air flow rates from left nozzle (
${Q}_{\text {NL}}$
) and the air flow rate from right nozzle (
${Q}_{\text {NR}}$
) are 3000 sccm, the average peak voltage (APV) is 1.924 V, the average power (AP) is 97.93 mW and the energy conversion ratio (ECR) is 41.12%. Second, when
${Q}_{\text {NL}}$
is 3000 sccm and
${Q}_{\text {NR}}$
is 2000 sccm, the APV is 1.245 V, the AP is 41.01 mW, and the ECR is 26.57%. Third, when
${Q}_{\text {NL}}$
is 3000 sccm and
${Q}_{\text {NR}}$
is 0 sccm, the APV is 0.666 V, the AP is 11.68 mW, and the ECR is 9.82%. The experimental results show that it is feasible and performs well in a real-life situation, which is a major step toward the application as an energy harvester.