A-B 1746-OV8

 

A-B 1746-OV8

 

恒功率負(fù)載的機(jī)械特性較復(fù)雜，系統(tǒng)設(shè)計(jì)時(shí)應(yīng)注意不能使異步電動(dòng)機(jī)超過(guò)其同步轉(zhuǎn)速運(yùn)行，否則易造成破壞性機(jī)械故障。通常變頻器的容量一般取1.1～1.5倍異步電動(dòng)機(jī)的容量。

1.3 恒轉(zhuǎn)矩負(fù)載

在恒轉(zhuǎn)矩負(fù)載中，負(fù)載轉(zhuǎn)矩TL與轉(zhuǎn)速n無(wú)關(guān)，任何轉(zhuǎn)速下負(fù)載轉(zhuǎn)矩TL總保持恒定或基本恒定，負(fù)載功率則隨著負(fù)載速度的增高而線形增加。例如吊車、傳送帶、注塑機(jī)、攪拌機(jī)、提升機(jī)等摩擦類負(fù)載都屬于恒轉(zhuǎn)矩負(fù)載。這類負(fù)載采用變頻器控制的目的是實(shí)現(xiàn)設(shè)備自動(dòng)化、提高勞動(dòng)生產(chǎn)率、提高產(chǎn)品質(zhì)量。

變頻器拖動(dòng)恒轉(zhuǎn)矩負(fù)載時(shí)，低速時(shí)的輸出轉(zhuǎn)矩要足夠大，并且要有足夠的過(guò)載能力，一般為150%額定電流。如果需要在低速下長(zhǎng)時(shí)穩(wěn)速運(yùn)行，應(yīng)該考慮異步電動(dòng)機(jī)的散熱能力，避免電動(dòng)機(jī)溫升過(guò)高。

系統(tǒng)設(shè)計(jì)時(shí)應(yīng)注意適當(dāng)增大異步電動(dòng)機(jī)的容量或增大變頻器的容量。變頻器的容量一般取1.1～1.5倍異步電動(dòng)機(jī)的容量。

2、根據(jù)負(fù)載特性選取適當(dāng)控制方式的變頻器

除變頻器制造工藝外，變頻器采用何種控制方式也是非常重要的。變頻器的控制方式主要分為開環(huán)控制和閉環(huán)控制兩種。其中開環(huán)控制方式，結(jié)構(gòu)簡(jiǎn)單，性能可靠，但調(diào)速精度和動(dòng)態(tài)反應(yīng)性能較低；而閉環(huán)控制方式可以根據(jù)流量、溫度、位置、速度、壓力等參數(shù)的變化進(jìn)行實(shí)時(shí)控制，動(dòng)態(tài)反應(yīng)快，但某些時(shí)候?qū)崿F(xiàn)起來(lái)比較困難，且成本較高。用戶應(yīng)根據(jù)自身需求進(jìn)行選擇相應(yīng)的控制方式，從而獲得需要的調(diào)速特性。

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