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On the base of understanding the requirements of the customers and the advanced skills at home and abroad, our company has developed and designed these production lines with the speed 60～220m /min; the paper width 1600～2200mm and four fluting UV type A,B,C,E for all the customers to choose from.

本公司在吸收国内外先进技术、广泛了解用户需求的基础上、开发了设计速度从60～220m /min 、1600～2200m /min 、 UV 形的 A，C，B，E 四种楞型的三、五、七层瓦楞纸板生产线供客户按需选择。

First, the paper reviews the development and research of AC transfer speed system, introduces the different control strategy of transfer speed system for asynchronous motor, and discusses the basic principle of vector control system for asynchronous motor in detail,including the mathematics model and coordinate transformation of asynchronous motor, the fundamental equation of vector control, the estimation method of rotor flux, the system structure of vector control etc. Then, the paper lays stress on the fundamental principle, control algorithm and realization method in TMS320LF2407 of space vector pulse width modulation technology.

本文首先简述了交流调速系统的发展和研究重点，介绍了异步电机调速系统的不同控制策略，详细论述了异步电机矢量控制系统的基本原理：异步电机的数学模型和坐标变换、矢量控制的基本方程式、转子磁链的观测方法、矢量控制的系统结构等，并重点分析了空间矢量脉宽调制技术的基本原理、控制算法以及在TMS320LF2407中的实现方法。

That is the speed identification and the rotor flux estimation scheme of the sensorless vector control, and realization ways of the carrier pulse width modulation, and the dead time compensation scheme.

即无速度传感器矢量控制的速度辨识和磁通观测、载波型PWM方法实现、死区时间补偿方案。

Based on CMOS technology and using Composer and Spectre tools of Cadence EDA, a type of single-chip controller is designed for the fly-back switching power supply of AC/DC. It works at 70KHz with current mode pulse width modulation; and the max duty is 75 percent.

本论文基于高压CMOS工艺，用Cadence EDA中的Composer包及Spectre仿真工具，设计了一种反激式AC/DC开关电源控制芯片。

In the voltage doubling rectifying circuit, the high voltage has been realized by the positive and negative way, and the voltage between the cathode and anode could reach 1700 V. In the fly-back switching high-voltage power supply, considering the requirements of each unit of the driving circuits on the power supply, the three-group voltage outputs including low-voltage outputs have been realized: 1600V/20mA,12V/500mA, 5V/50mA, in which UC3842 has been used to achieve pulse width modulation.

在倍压整流电路设计中，采用正、负电压方式实现高压，有效降低了阴阳极间所需的高压，最终两极间可产生1700V电压；在反激式开关电源电路设计中，利用UC3842芯片实现PWM调制，考虑到驱动电路各单元对电源的需求，设计了包括低压电源在内的三组电源输出：1600V/20mA，12V/500mA，5V/50mA。

The flyboat was exceptionally long compared with its width, had a flat bottom, and was lightly built.

这种快艇船身长度大大超出其宽度，底平，体轻。

However, the pulse width becomes broad considering TOD or FOD.

而当考虑到三阶色散、四阶色散时，初始啁啾导致脉冲宽度大于无初始啁啾脉冲的宽度。

The foliated rock belt is over one hundred meters in width and the intensity of foliation in the center is stronger than that in the margin.

这个片理化岩带有100多来宽，带中央岩石的片理化程度较之于带边缘岩石要强。

Taking for the f 6 of ground fissures in Xi'an city, this *** imitated disaster prevention of the three-level buildings which were crossing the ground fissures and the width of the influencing zone of ground fissure hazards. Based on the finite element analysis, it calculated the safety distance of hanging wall and footwall.

以西安市f 6地裂缝为例，对跨地裂缝的三级建筑物防灾、地裂缝灾难影响带宽度进行了数值模拟；提出了上下盘建筑物的安全间隔。

Forelegs are straight and strong with great length between elbow and pastern; elbows well held in; forefeet large in both length and width; toes well arched; feet covered with long thick hair; fine in texture; pasterns long and straight; pads of feet unusually large and well down on the ground.

前肢直立而强壮，肘和系部之间的长度适中，肘适当内敛；前爪非常长而宽；脚趾成拱形；脚上覆盖着浓密的毛；结构适宜；系部长而直；脚垫出奇的大并且自然落地。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。