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變頻器對電動機的四種控制方式

2020-08-17

U/f恒定控制U/f控制是在改變電動機電源頻率的同時改變電動機電源的電壓,使電動機磁通保持一定,在較寬的調速范圍內,電動機的效率,功率因數不下降。因為是控制電壓(Voltage)與頻率(Frequency)之比,稱為U/f控制。恒定U/f控制存在的主要問題是低速性能較差,轉速極低時,電磁轉矩無法克服較大的靜摩擦力,不能恰當的調整電動機的轉矩補償和適應負載轉矩的變化; 其次是無法準確的控制電動機的實際轉速。由于恒U/f變頻器伟德体育是轉速開環控制,由異步電動機的機械特性圖可知,設定值為定子頻率也就是理想空載轉速,而電動機的實際轉速由轉差率所決定,所以U/f恒定控制方式存在的穩定誤差不能控制,故無法準確控制電動機的實際轉速。


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