XV Yong mei1, LI Ting2, LI Yin yin2, MA Ji en2, FANG You tong2

(1.Hangzhou Special Equipment Inspection and Research Institute, Hangzhou 310003, China;

2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the requirement of high speed and heavy duty bearings, and the advantages of the magnetic fluid bearing in terms of self lubricating sealing, high reliability, high speed, low friction lubrication, the performance of the magnetic fluid bearing was evaluated. Firstly, the theoretic analysis of viscosity of the magnetic fluid were carried out. An external magnetic field was applied and the viscosity pressure and viscosity temperature characteristics were obtained by using Matlab. The magnetic field distribution was designed and obtained using the finite element analysis. The results indicate that under the influence of external magnetic field, the viscosity of the magnetic fluid bearing lubricant changes, meanwhile, compared to the conventional bearing, the bearing capacity of the magnetic fluid bearing is improved, and therefore, it can work in conditions of high temperature and high speed.

Key words: magnetic fluid; bearing; lubricant; viscosity