20AD5P0A3AYNANC0 20AD5P0A3AYNANC0
優(yōu)勢(shì)品牌：Allen-Bradley Siemens ABB
庫(kù)存現(xiàn)貨 *優(yōu)惠
陜西欣鴻然自動(dòng)化設(shè)備有限公司
:寧超
：
:1293858601
:1293858601
傳真:
地址：西安市灞橋區(qū)浐河?xùn)|路水岸東方1單元14棟602室。
基本組成
變頻器通常分為4部分：整流單元、高容量電容、逆變器和控制器。
整流單元：將工作頻率固定的交流電轉(zhuǎn)換為直流電。
高容量電容：存儲(chǔ)轉(zhuǎn)換后的電能。
逆變器：由大功率開(kāi)關(guān)晶體管陣列組成電子開(kāi)關(guān)，將直流電轉(zhuǎn)化成不同頻率、寬度、幅度的方波。
控制器：按設(shè)定的程序工作，控制輸出方波的幅度與脈寬，使疊加為近似正弦波的交流電，驅(qū)動(dòng)交流電動(dòng)機(jī)。
（1）運(yùn)算電路：將外部的速度、轉(zhuǎn)矩等指令同檢測(cè)電路的電流、電壓信號(hào)進(jìn)行比較運(yùn)算，決定逆變器的輸出電壓、頻率。
（2）電壓、電流檢測(cè)電路：與主回路電位隔離檢測(cè)電壓、電流等。
（3）驅(qū)動(dòng)電路：驅(qū)動(dòng)主電路器件的電路。它與控制電路隔離使主電路器件導(dǎo)通、關(guān)斷。
（4）速度檢測(cè)電路:以裝在異步電動(dòng)機(jī)軸機(jī)上的速度檢測(cè)器(tg、plg等)的信號(hào)為速度信號(hào)，送入運(yùn)算回路，根據(jù)指令和運(yùn)算可使電動(dòng)機(jī)按指令速度運(yùn)轉(zhuǎn)。
（5）保護(hù)電路：檢測(cè)主電路的電壓、電流等，當(dāng)發(fā)生過(guò)載或過(guò)電壓等異常時(shí)，為了防止逆變器和異步電動(dòng)機(jī)損壞
直流電動(dòng)拖動(dòng)和交流電動(dòng)機(jī)拖動(dòng)先后生于19世紀(jì)，距今已有100多年的歷史，并已成為動(dòng)力機(jī)械的主要驅(qū)動(dòng)裝置。由于當(dāng)時(shí)的技術(shù)問(wèn)題，在很長(zhǎng)的一個(gè)時(shí)間內(nèi)，需要進(jìn)行調(diào)速控制的拖動(dòng)系統(tǒng)中則基本上采用的是直流電動(dòng)機(jī)。
直流電動(dòng)機(jī)存在以下缺點(diǎn)是由于結(jié)構(gòu)上的原因：
1、由于直流電動(dòng)機(jī)存在換向火花，難以應(yīng)用于存在易燃易爆氣體的惡劣環(huán)境;
2、需要定期更換電刷和換向器，維護(hù)保養(yǎng)困難，壽命較短;
3、結(jié)構(gòu)復(fù)雜，難以制造大容量、高轉(zhuǎn)速和高電壓的直流電動(dòng)機(jī)。
（1）信號(hào)線與動(dòng)力線要垂直交叉或分槽布線。
（2）不要采用不同金屬的導(dǎo)線相互連接。
（3）屏蔽管（層）應(yīng)可靠接地，并保證整個(gè)長(zhǎng)度上連續(xù)可靠接地。
（4）信號(hào)電路中要使用雙絞線屏蔽電纜。
（5）屏蔽層接地點(diǎn)盡量遠(yuǎn)離變頻器，并與變頻器接地點(diǎn)分開(kāi)。
（6）磁環(huán)可以在變頻器輸入電源線和輸出線上使用，具體方法為：輸入線一起朝同一方向繞4圈，而輸出線朝同一方向繞3圈即可。繞線時(shí)需注意，盡量將磁環(huán)靠近變頻器。
（7）一般對(duì)被干擾設(shè)備儀器，均可采取屏蔽及其它抗干擾措施。
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The gentleman is not close to the evil.Emperor lost ground, name;Out the surname, name.
A minister of the: don't fight.Three to fight and don't listen to, it escaped.
Son also things: three suggestion and don't listen to, the tears and then.You have a disease, drink medicine, I taste the first.Have a disease, drink medicine, first taste of the children.
D not iii, take the medicine.
儗 shall in its Aaron.
Asked the years of emperor of yue: "smell: beginning suit clothes several feet."Years of king asked: long, can from the temple the state of yue yi;Young, yue not from the temple the state of things.Asked the son of a doctor, long, yue to royal yi;Young, yue to royal also.Can ask James the son of my life: long, a cult film yi;Young, yue does not a cult film is.Ask the child of the common people: long, yue can pay negative yi;Young, yue also failed to negative pay.
Number of rich, ask the monarch to, out of the world.Ask the doctor of the rich, have to kill the feed force, phenomena of clothes is not false.Ask the rich, to car number.Ask the common people of the rich, number of livestock.
Son of heaven to worship, sacrifice, the mountains and rivers, the five si, old times.Governors si, offering mountains and rivers, offering five si, old times.The doctor offering five si, old times.And offering its first.
