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從理論上分析，如果能夠控制電動機同步磁場的轉速緩慢下降，使電動機在同一轉速下特性跳轉時，特性曲線維持在第一象限，理論上分析電機只經歷有限的能耗制動階段，不會過熱。而變頻器良好的內、外特性可以保證上述各項條件的滿足。
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但是，采用該方法有一些必要的前提條件，首先，系統不能頻繁進行啟／停，否則會造成變頻器直流電路故障。其次，提升機、電梯等下放重物的工況不適宜采用。再次，系統降速時間不能過短，即降速不能過快，否則工作點將進入第二象限發生再生制動過程，引起電機過熱。 A5E00470986 Panel PC Spare Part Siemens
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