中文摘要：

为了研究气隙偏心对陶瓷电主轴转子系统的影响，首先分析只考虑静偏心时电主轴气隙磁导的变化规律，推导了静偏心下作用于转子的单边磁拉力表达式，并通过电磁场有限元分析了170SD30的无内圈式陶瓷电主轴单边磁拉力特性。建立了电主轴转轴三维有限元模型，分析对比陶瓷转轴及金属转轴在单边磁拉力作用下的变形情况。分析表明，电主轴气隙偏心对电磁转矩影响较小。且当极对数P〉1时产生的单边磁拉力不随时间变化。将陶瓷材料应用于电主轴转轴中，气隙偏心对电主轴整体性能的影响将减弱。

英文摘要：

In order to study the effect of air-gap eccentricity on the rotor system of the ceramic spindle, the varia- tion of air-gap permeance of motorized spindle under the static eccentric was analyzed first, and the expression of the unilateral magnetic pull on the rotor was derived. The characteristics of the unilateral magnetic pull acting on the 170SD30 rotor without inner ceramic motorized spindle were investigated by the electromagnetic-field finite element method. The deformations of ceramic shaft and metal shaft under the unilateral magnetic pull were analyzed and compared based on the finite element three-dimensional model. The results show that the air-gap eccentricity has less impact on the electromagnetic torque, and the unilateral magnetic pull does not change over time when the pole P is greater than 1. Therefore, the effect of the air-gap eccentricity on the performance of the motorized spindle will weaken because of the using ceramic material in motorized spindle.