深圳長欣自動化設(shè)備有限公司

51309276-150

51309276-150

51309276-150變頻調(diào)速
    　　 從式（1—1）中可以看出，當(dāng)異步電動機(jī)的磁對數(shù)Pn定，轉(zhuǎn)差率s—定時，改變定子繞組的供電頻率f1可以達(dá)到調(diào)速目的，電動機(jī)轉(zhuǎn)速n基本上與電源的頻率f1成正比，因此，平滑地調(diào)節(jié)供電電源的頻率，就能平滑，無級地調(diào)節(jié)異步電動機(jī)的轉(zhuǎn)速。變頻調(diào)速調(diào)速范圍大，低速特性較硬，基頻f=50Hz以下，屬于恒轉(zhuǎn)矩調(diào)速方式，在基頻以上，屬于恒功率調(diào)速方式，與直流電動機(jī)的降壓和弱磁調(diào)速十分相似。且采用變頻起動更能顯著改善交流電動機(jī)的起動性能，大幅度降低電機(jī)的起動電流，增加起動轉(zhuǎn)矩。所以變頻調(diào)速是交流電動機(jī)的理想調(diào)速方案。

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