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