Study on Pulsation Suppression Method of Zero Power Magnetic Bearing Using Square PM

Bearings are important components that allow the drive part of a machine to operate smoothly and support the rotating shaft of the motor. However, they are prone to breakdowns due to mechanical loss, ball cracking, and rust, and require regular maintenance, and their lifespans are shortened due to lubricant leaks and excessive friction when submerged in liquid or in high-speed rotation areas. Magnetic bearings, which do not have mechanical contact, are also being considered as an alternative to ball bearings, but they generally require an external power source and control for support, so their applications are limited[1]. In this study, we propose a magnetic bearing that can be passively controlled with zero power by using magnetic repulsion when PMs with the same poles are brought close to each other. We will also consider applying magnetic bearings to implantable artificial hearts, food processing machines, and drones.