產(chǎn)品詳情
變頻不是到處可以省電，有不少用變頻并不一定能省電。
作為電子電路，變頻器本身也要耗電（約額定功率的3-5%）。一臺(tái)1.5匹的空調(diào)自身耗電算下來也有20-30W,相當(dāng)于一盞長(zhǎng)明燈.率補(bǔ)償，能速度控制的誤差；通過反饋估算磁鏈幅值，低速時(shí)定子電阻的影響；將輸出電壓、電流閉環(huán)，以動(dòng)態(tài)的精度和度。但控制電路環(huán)節(jié)較多，且沒有引入轉(zhuǎn)矩的調(diào)節(jié)，所以性能沒有根本。
矢量控制(VC)：
矢量控制變頻調(diào)速的做法是將異步電動(dòng)機(jī)在三相坐標(biāo)系下的定子電流Ia、Ib、Ic、通過三相－二相變換，等效成兩相靜止坐標(biāo)系下的交流電流Ia1Ib1，再通過按轉(zhuǎn)子磁場(chǎng)定向變換，等效成同步坐標(biāo)系下的直流電流Im1、It1(Im1相當(dāng)于直流電動(dòng)機(jī)的勵(lì)磁電流；It1相當(dāng)于與轉(zhuǎn)矩成正比的電樞電流)，然后模仿直流電動(dòng)機(jī)的控制，求得直流電動(dòng)機(jī)的控制量，經(jīng)過相應(yīng)的坐標(biāo)反變換，實(shí)現(xiàn)對(duì)異步電動(dòng)機(jī)的控制。其實(shí)質(zhì)是將交流電動(dòng)機(jī)等效為直流電動(dòng)機(jī)，分別對(duì)速度，磁場(chǎng)兩個(gè)分量進(jìn)行控制。通過控制轉(zhuǎn)子磁鏈，然后分解定子電流而轉(zhuǎn)矩和磁場(chǎng)兩個(gè)分量，經(jīng)坐標(biāo)變換，實(shí)現(xiàn)正交或解耦控制。矢量控制的提出具有劃時(shí)代的意義。然而在實(shí)際應(yīng)用中，由于轉(zhuǎn)子磁鏈難以準(zhǔn)確觀測(cè)，特性受電動(dòng)機(jī)參數(shù)的影響較大，且在等效直流電動(dòng)機(jī)控制中所用矢量變換較復(fù)雜，使得實(shí)際的控制效果難以達(dá)到分析的結(jié)果。
【公 司】： 福建鴻飛達(dá)自動(dòng)化科技有限公司【主 營(yíng)】： AB(羅克韋爾)PLC全系列、ABB機(jī)器人備件、施耐德140/TSX、西門子6SN/6FC、伺服全套等
【價(jià) 格】： 電議
【發(fā)布人】： 程先生
【電 話】： 15306977024 13625073704
【所在地】： 福建 - 福州
【坐 機(jī)】： 0591-83532940
【Q Q】： 2851617309
【傳 真】： 0591-88263940
【郵 箱】： 2851617309@qq.com
福建省福州市高新區(qū)新保路正榮財(cái)富中心SOHO B幢8樓
產(chǎn)品價(jià)格以電話或者QQ詢價(jià)為準(zhǔn)，發(fā)布價(jià)格不做參考，圖片也一樣
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