在電動(dòng)機(jī)運(yùn)行時(shí)按停止按鈕SB2,它的常閉觸點(diǎn)斷開(kāi),使KM的線圈失電,KM的主觸點(diǎn)斷開(kāi),異步電動(dòng)機(jī)的三相電源被切斷,電動(dòng)機(jī)停止運(yùn)行i同時(shí)控制電路中KM的輔助常開(kāi)觸點(diǎn)斷開(kāi)。當(dāng)停止按鈕SB2被放開(kāi),其常閉觸點(diǎn)閉合后,KM的線圈仍然失電,電動(dòng)機(jī)繼續(xù)保持停止運(yùn)行狀態(tài)。圖1.3給出了有關(guān)信號(hào)的波形圖,圖中用高電平表示1狀態(tài)(線圈通電、按鈕被按下),用低電平表示0狀態(tài)(線圈斷電、按鈕被放開(kāi))。
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