To improve the stability and output performance of the energy conversion unit based on airflow energy harvester using double-pull diamagnetic levitation

a new energy conversion unit using a centrosymmetric four-notch levitation rotor and the optimal layout scheme of coils is proposed.Through theoretical and simulation analysis

it is found that compared with the three-notch levitation rotor

the four-notch levitation rotor has better rotational stability.The energy harvester with the new energy conversion unit that adopts the four-notch levitation rotor and optimal layout scheme of the coils not only has higher output voltage and output power

but also further improves energy harvesting efficiency.The output performance of the energy harvester using the new energy conversion unit is studied using a built experimental test platform.Experimental results show that when the gas volume flow rate is 3000mL/min

the peak output voltage of the energy harvester using the new energy conversion unit is 2.812V

the average output power is 149.20mW

and the maximum rotational speed of the levitation rotor is 21119r/min

which are 152.25%

165.32%

and 104.76% of those of the energy harvester using the three-notch levitation rotor and the original layout scheme of the coils

respectively.