Analysis on approximate computation of gap reluctance in radial active magnetic bearings

Abstract

Based on a same model of the radial magnetic bearing,the integral computation is compared with linear ap- proximate computation and the finite element method.The results indicate that integral computational method is feasible, especially when the gap is very small relatively,the relative error of gap reluctance produced in integral method is obvi- ously smaller than that produced in the linear approximate cal- culation.In addition,the precision of linear approximate calcu- lation is discussed from two aspects of absolute error and rela- tive error,and the formula with three-order algebra precision is put forward.Not only precision of equivalent magnetic circuit can be improved by integral computation of gap reluctance,but also a differential method can be provided for analyzing mag- netic suspension system.