A-B 1746-IB32

 

A-B 1746-IB32

 

恒功率負載的機械特性較復雜，系統(tǒng)設計時應注意不能使異步電動機超過其同步轉速運行，否則易造成破壞性機械故障。通常變頻器的容量一般取1.1～1.5倍異步電動機的容量。

1.3 恒轉矩負載

在恒轉矩負載中，負載轉矩TL與轉速n無關，任何轉速下負載轉矩TL總保持恒定或基本恒定，負載功率則隨著負載速度的增高而線形增加。例如吊車、傳送帶、注塑機、攪拌機、提升機等摩擦類負載都屬于恒轉矩負載。這類負載采用變頻器控制的目的是實現(xiàn)設備自動化、提高勞動生產率、提高產品質量。

變頻器拖動恒轉矩負載時，低速時的輸出轉矩要足夠大，并且要有足夠的過載能力，一般為150%額定電流。如果需要在低速下長時穩(wěn)速運行，應該考慮異步電動機的散熱能力，避免電動機溫升過高。

系統(tǒng)設計時應注意適當增大異步電動機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倍異步電動機的容量。

2、根據(jù)負載特性選取適當控制方式的變頻器

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，結構簡單，性能可靠，但調速精度和動態(tài)反應性能較低；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)的變化進行實時控制，動態(tài)反應快，但某些時候實現(xiàn)起來比較困難，且成本較高。用戶應根據(jù)自身需求進行選擇相應的控制方式，從而獲得需要的調速特性。

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