机床

The effect of the non-liner gap on the dynamic characteristic of the feed drive system is important.

间隙非线性是数控机床进给系统精度的重要影响因素。

America's machine-tool industry was on the ropes .

美国的机床工业是岌岌可危了。

America's machine-tool industry was on the ropes.

美国的机床工业也即将消失。

Foreign-made cars and textiles were sweeping into the domestic market America's machine-tool industry was on the ropes.

外国制造的汽车和纺织品正在大举进入国内市场。美国的机床工业也即将灭亡。

The machine tool market as one that is highly valued to the user.

该机床一经面市，即获到用户的高度评价。

Key words: numerical control machine tool; numerical control machining; opposite clearance; vector operation; precompensation

关键 词：数字控制机床；数控加工；反向间隙；向量运算；预补偿

Use:In coordination with the leveling instrument,optical flatness measuring instrument and electronic leveling instrument to test the flatness of plate,leveling ruler,machine tool working platform ,guides and precision workpiece.

用途：用途：配合水平仪、光学平直仪、电子水平仪用来检测平板、平尺、机床工作台、导轨和精密工件的平面度。

In coordination with the leveling instrument, optical flatness measuring instrument and electronic leveling instrument to test the flatness of plate, leveling ruler, machine tool working platform, guides and precision workpiece.

配合水平仪、光学平直仪、电子水平仪用来检测平板、平尺、机床工作台、导轨和精密工件的平面度。

ABSTRACT The researches of this thesis are carried out around the development of high performance machine tool spindle permanent magnet synchronous motor and its drive system. Five parts are included: First of all, concerning the operating characteristics of the machine tool spindle drive system, the optimum current control strategies of spindle PMSM are determined; The design rules of spindle PMSM's key parameters are summarized, based on the study on the influences of the design parameters on the performances of the PMSM operating at different current control strategies; The practical methods to improve the flux-weakening ability of the PMSM are presented; Based on the analysis and comparison of the operating performances of PMSM with different rotor structures, a novel PMSM rotor structure, which is of excellent mechanical performance, suitable for fluxweakening operation and can improve the torque output capacity in the same time, is presented.

本文围绕高性能机床主轴永磁同步电动机及其传动系统的设计研究展开，所做工作主要包括五部分：首先，确定了主轴永磁同步电动机定子电流的最优控制策略；通过对不同控制策略下主要设计参数对主轴永磁同步电动机性能影响的计算研究，总结了参数设计规律；提出了永磁同步电动机弱磁扩速的实用措施；在分析比较不同转子磁路结构电机的性能，尤其是弱磁扩速能力的基础上，提出了一种机械性能优越，易于弱磁扩速，同时能保证电机恒转矩运行时的转矩输出能力的新型转子磁路结构。

A method of the order selection of polynomial model for geometric errors modeling for NC machine tool was presented.

提出了一种针对数控机床几何误差多项式模型的阶数选择方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。