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通常交流電動機制動時的機械特性曲線。設A點為正常工作點。電動機同步旋轉磁場轉速為：
為電機同步轉速，為電源頻率，為電動機磁極對數。
在通常電動機的制動進程中，電動機先減速，電動機同步旋轉磁場轉速低于轉子轉速，工作點在同一轉速下由曲線①的A點跳至曲線②的B點，即從榜首象限過渡到第二象限稱之為同一轉速下特性的跳轉，則電機得到反方向的制動轉矩T進入發電制動情況，拖動系統沿圖1中曲線②活絡降速，當低于某一轉速后，向定子繞組輸入直流，構成固定磁場，發作制動轉矩。在這一進程中，電機將通過再生發電制動和能耗制動而畢竟間斷。
從理論上分析，假設可以控制電動機同步磁場的轉速緩慢降低，使電動機在同一轉速下特性跳轉時，特性曲線維持在榜首象限，如圖1中虛線組③所示緩慢降速，不跳轉至第二象限則拖動系統在降速進程中可以有用的避免發作再生制動進程。如圖1所示，當電機轉速在小于臨界轉速nh的情況下接入直流進行制動，并相應控制接入直流的大小和時間，理論上分析電機只閱歷有限的能耗制動期間，不會過熱。而變頻器出色的內、外特性可以保證上述各項條件的滿足。
但是，選用該方法有一些必要的條件條件，首要，系統不能一再進行啟／停，否則會構成變頻器直流電路缺點。其次，提升機、電梯等下放重物的工況不適合選用。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作再生制動進程，致使電機過熱。

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