基于电磁场分析的快速刀具伺服系统的设计(英文)  

Design of Fast Tool Servo System Based on Magnetic Field Analysis

作　　者：房丰洲[1,2] 聂雅慧[1,2] 张效栋[1,2] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072 [2]天津大学微纳制造工程技术中心,天津300072

出　　处：《纳米技术与精密工程》2011年第6期539-544,共6页Nanotechnology and Precision Engineering

基　　金：the National High Technology Research and Development Program ("863" program) of China(No.2009AA044305);the National Natural Science Foundation of China(Nos.90923320 and 90923038);the "111" Project by the State Administration of Foreign Experts Affairs and the Ministry of Education of China(No.B07014)~~

摘　　要：基于快速刀具伺服(FTS)系统的单点金刚石车削是加工光学自由曲面的重要方法之一.传统的直线刀具伺服系统都具有频率响应低的问题,严重限制了可以加工自由表面的复杂程度.文中介绍了麦克斯韦力驱动的快速刀具伺服系统的设计,电机采用永磁体偏置模型实现线性驱动,根据磁路设计原理推导了电机的运动公式,利用有限元分析(FEA)的方法分析了电机模型在高频信号驱动时的受力曲线、涡流损耗的大小和分布情况.根据分析的结果设计了电机的驱动系统,并进行了开环正弦驱动实验和电极频率响应曲线的测试,最终利用PID算法实现了FTS系统的闭环控制.基于麦克斯韦力驱动的FTS系统的最佳驱动频率应小于40 kHz,系统目前行程可以达到15.75μm,最大的频率响应可以达到100 kHz,系统可以跟踪500 Hz正弦波运动.Single-point turning based on fast tool servo （FTS） system is one of the important approaches to machining optical free-form surfaces. The conventional linear tool servos have the problem of low frequency-response, which limits the complexity of the surfaces to be machined. This paper presents the design of an FTS system, which is driven by Maxwell force and modelled by using the permanent magnet biasing methods to realize linear operation. The moving equation of the FTS was deduced according to magnetic circuit design principles. The magnetic distribution, eddy-current loss and the driving force curves at high frequency were simulated and calculated based on the finite element analysis （FEA） method. The FTS system was designed according to the analytical results. The sinusoid driving experiment was conducted and the frequency-response curve of the FTS was tested. The FTS system was closed-loop controlled by using PID algorithm. The proper driving frequency of the FTS should be under 40 kHz. The system had the stroke of 15.75 μm with the maximum frequency of 100 kHz. The closed system had the ability to track 500 Hz sinusoid wave movement.

关 键 词：快速刀具伺服系统 自由曲面 麦克斯韦力 电磁场分析 高频响应 

分 类 号：TG51[金属学及工艺—金属切削加工及机床]