Axial Permanent Magnetic Bearing Design For a Low-Loss Energy Storage Device Mounted on Hybrid Bearing System

하이브리드 베어링 지지 저손실 에너지 저장 시스템의 축방향 영구자석 베어링 설계기술 연구

The axial bearing using two ring type permanent magnets to support the weight of a flywheel is proposed to reduce the bearing loss in a flywheel energy storage , system. Two permanent magnet makes stable force in axial direction but unstable force in lateral direction. The lateral unstable stiffness is identified quantitatively using flux analysis, and then through the rotor dynamic analysis on a rigid flywheel system the unstable effects on the system by the stiffness is investigated.