51403988-150

51403988-150

51403988-150變轉(zhuǎn)差率調(diào)速
    　　改變轉(zhuǎn)差率調(diào)速的方法很多，常用的方案有：異步電動(dòng)機(jī)定子調(diào)壓調(diào)速，電磁轉(zhuǎn)差離合器調(diào)速和繞線式異步電動(dòng)機(jī)轉(zhuǎn)子回路串電阻調(diào)速，串級(jí)調(diào)速等。
    　　定子調(diào)壓調(diào)速系統(tǒng)就是在恒定交流電源與交流電動(dòng)機(jī)之間接入晶閘管作為交流電壓控制器，這種調(diào)壓調(diào)速系統(tǒng)僅適用于些屬短時(shí)與重復(fù)短時(shí)作深調(diào)速運(yùn)行的負(fù)載。為了能得到好的調(diào)速度與能穩(wěn)定運(yùn)行，般采用帶轉(zhuǎn)速負(fù)反饋的控制方式。所使用的電動(dòng)機(jī)可以是繞線式異電動(dòng)機(jī)或是有高轉(zhuǎn)差率的鼠籠式異步電動(dòng)機(jī)。
    　　電磁轉(zhuǎn)差離臺(tái)器調(diào)速系統(tǒng)，是由鼠籠式異步電動(dòng)機(jī)、電磁轉(zhuǎn)差離合器以及控制裝置組合而成。鼠籠式電動(dòng)機(jī)作為原動(dòng)機(jī)以恒速帶動(dòng)電磁離合器的電樞轉(zhuǎn)動(dòng)，通過對(duì)電磁離合器勵(lì)磁電流的控制實(shí)現(xiàn)對(duì)其磁的速度調(diào)節(jié)。這種系統(tǒng)般也采用轉(zhuǎn)速閉環(huán)控制。
 現(xiàn)成的傳輸技術(shù)其實(shí)也有相關(guān)的實(shí)現(xiàn)方法:傳統(tǒng)的數(shù)據(jù)網(wǎng)通過協(xié)議轉(zhuǎn)換器(E1到V35)和路由器到E1接口來間接實(shí)現(xiàn)用E1來傳輸IP(如圖1),這樣增加了網(wǎng)絡(luò)路由的跳數(shù)(HOP),每臺(tái)路由器還需個(gè)合法的IP地址,讓網(wǎng)絡(luò)變得非常復(fù)雜,大大增加運(yùn)營(yíng)商,降低了網(wǎng)絡(luò)建設(shè)進(jìn)度因此有必要在數(shù)據(jù)鏈路層直接完成以太網(wǎng)到E1的轉(zhuǎn)換,以此來充分利用現(xiàn)有的E1資源、實(shí)現(xiàn)組網(wǎng)簡(jiǎn)單、網(wǎng)絡(luò)建設(shè)維護(hù)方便及建設(shè)費(fèi)用低等優(yōu)點(diǎn)因此我們所需的只是個(gè)以太網(wǎng)到E1的 接口轉(zhuǎn)換器,E1通過PDH或SDH傳輸平臺(tái)可以很容易地跨越地區(qū),兼容不同技術(shù)和標(biāo)準(zhǔn),實(shí)現(xiàn)LAN和WAN之間的互聯(lián)或幾個(gè)LAN之間的遠(yuǎn)距離互聯(lián),如此就可取代部分VPN路由器和邊緣路由器,減少網(wǎng)絡(luò)的路由跳數(shù)(HOP),大減少網(wǎng)絡(luò)時(shí)延,讓相距很遠(yuǎn)的幾個(gè)LAN連成同個(gè)LAN,用戶可通過網(wǎng)上鄰居來訪問遠(yuǎn)端用戶,相當(dāng)簡(jiǎn)單方便(如圖2)

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