变频器

Based for the purpose, this paper develops a simple way named analogue circuit to realize SPWM control. This new way is proved in the design of three- phase small power converter and get good effect.

基于此目的，本文提出用简单的模拟电路实现逆变器正弦脉宽调制的方案，并用此方法实现了小功率三相变频电压源的设计，得到较好的效果。

Key words:double housing planer; knife feed mechanism; PLC; converter

要害词：龙门刨床；刀架进刀机构；可编程序控制器；变频调速器

Semi-closed loop servo control, the use of variable frequency stepless speed spindle, spindle plus encoder can be car thread, and realize cutting Constant Linear Velocity.

采用半闭环伺服控制，主轴采用变频无级调速，主轴加编码器，可以车螺纹，并实现恒线速度切削。

Only oneA/D converter is needed to complete complex quadrature translation and digital downconversion, get in-phase component and quadrature component in digital field, and also,after intra-pulse compression is done, the signal-to-noise ratio is raised, and inter-pulsecompression is done in digital field, and finally, high range resolution profile is got.Two-step stretch processing method for MMW high-resolution RADAR is presented.

计算并优化了毫米波雷达中频信号带通采样的最佳采样频率，应用现有的集成电路技术实现对中频信号的直接采样、用一个A／D转换器在数字域完成复数正交变换，在数字域完成下变频、获得同相信号和正交相信号、完成对子脉冲的脉内压缩、完成对脉内压缩信号的第二次脉间压缩，从而获得高分辨一维距离像。

The company has been devoting to product development and renewing. Aiming at metallurgical industry, iron and steel company's coking system and petrol-chemical oil refining system, the company developed new environmental protection equipments by itself, i.e. frequency variable multi-chain driven tar separator and revolving drum sulfur shaping machine. These two products have gained certificates of patent issued by National Patent Bureau and been widely applied in oil refining system and coking system.In 2008 we have manufactured trolley system and facilities for ZHONG GANG Group .

我公司致力于产品开发、更新的研究，并针对冶金行业、钢厂焦化系统、石化炼油系统自主研究开发出新一代环保产品，变频多链式传动焦油分离器、转鼓式硫磺成型机，这两项均获得国家专利局颁发的专利证书，并广泛应用于炼油及焦化系统。2008至2009年我公司还为中钢集团四川碳素股份有限公司制作了台车式焙烧炉工程中全部的台车系统及相关设备。

It features more flexibility, high automation, constant tension and speed, low-tension dyeing etc. The AC converting servo system, PLC and large sc9 reen man-machine interface are adopted to make the machine operate automatically and simply.

自动化程度高，自动恒张力、恒线速运行，可适应低张力染色，高精度的交流变频伺服调速系统，可编程控器控制全机自动化操作，大屏幕人机面监控，操作简便，运行稳定可靠。

Our 3-wing and 4-wing revolving door use Germany LENZE Motors, maintenance-free,AC-drives; Chain transmission;Japanese MITSUBISHI PLC controller; Switzerland Bircher safety sensors.

我厂生产的三翼四翼旋转门采用德国伦茨马达，免维护，交流变频；链条传动；日本三菱PLC控制器；瑞士比茨感应器。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。