Bearing Force Characteristic Analysis of Lorentz-Force-Type Active Magnetic Bearing Using Distributed Winding(Mechanical Systems)

Abstract

Magnetic bearings have advantages such as no friction loss, no abrasion, lubrication free operation and so on. However it is not used widely due to its high cost and big size. In order to solve these problems, active magnetic bearing with a distributed winding was proposed. But sinusoidal variation of bearing force in angle variation of rotor is confirmed and its impacts on bearing loss. In this paper, causality of the bearing force characteristic variation is analyzed from two viewpoints of magnetic flux density and winding-accuracy changes. And aim at decreasing the sinusoidally-bearing force characteristic variation.