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:異步電動機定子調(diào)壓調(diào)速,電磁轉(zhuǎn)差離合器調(diào)速和繞線式異步電動機轉(zhuǎn)子回路串電阻調(diào)速,串級調(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機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)僅適用于些屬短時與重復短時作深調(diào)速運行的負載。為了能得到好的調(diào)速度與能穩(wěn)定運行,般采用帶轉(zhuǎn)速負反饋的控制方式。所使用的電動機可以是繞線式異電動機或是有高轉(zhuǎn)差率的鼠籠式異步電動機。
電磁轉(zhuǎn)差離臺器調(diào)速系統(tǒng),是由鼠籠式異步電動機、電磁轉(zhuǎn)差離合器以及控制裝置組合而成。鼠籠式電動機作為原動機以恒速帶動電磁離合器的電樞轉(zhuǎn)動,通過對電磁離合器勵磁電流的控制實現(xiàn)對其磁的速度調(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)其實也有相關的實現(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接口來間接實現(xiàn)用E1來傳輸IP(如圖1),這樣增加了網(wǎng)絡路由的跳數(shù)(HOP),每臺路由器還需個合法的IP地址,讓網(wǎng)絡變得非常復雜,大大增加運營商,降低了網(wǎng)絡建設進度因此有必要在數(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、實現(xiàn)組網(wǎng)簡單、網(wǎng)絡建設維護方便及建設費用低等優(yōu)點因此我們所需的只是個以太網(wǎng)到E1的 接口轉(zhuǎn)換器,E1通過PDH或SDH傳輸平臺可以很容易地跨越地區(qū),兼容不同技術(shù)和標準,實現(xiàn)LAN和WAN之間的互聯(lián)或幾個LAN之間的遠距離互聯(lián),如此就可取代部分VPN路由器和邊緣路由器,減少網(wǎng)絡的路由跳數(shù)(HOP),大減少網(wǎng)絡時延,讓相距很遠的幾個LAN連成同個LAN,用戶可通過網(wǎng)上鄰居來訪問遠端用戶,相當簡單方便(如圖2)
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