电磁驱动快速刀具伺服机构的电磁场和驱动力

Magneticfield and driving force characteristics for a fast electromagnetic tool servo

为了实现非轴对称光学元件的高效、高精度车削,研究了基于变磁阻正应力电磁驱动原理的快速刀具伺服机构(fast tool servo,FTS)。通过解析计算和数值模拟,得出如下结论:该类型FTS的驱动力在工作范围内能保持良好的线性化特征;其最大加速度潜力可达4500m/s2;气隙宽度X0是关键结构参数,对于微行程(<100μm)电磁驱动机构,X0应在工作行程的2～5倍范围内选取。

A normal-stress electromagnetic fast tool servo was developed to improve the productivity and precision of non-axisymmetric turning. The tool is based on the bias flux for driving-force linearization. Both flux current analysis and finite element analysis solutions were used to investigate the magneticfield and driving force characteristics to identity the key factors controlling the cutting characteristics. The results show that driving force linearization is applicable throughout the entire stroke and that the air-gap length is a key factor for the structure and it is approximately 2- 5 times of the stroke; and the fast tool servo of this type has a potential acceleration of 4 500 m/s^2,