發布日期:2022-04-18 點擊率:73
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該電路采用時間繼電器來控制轉子電阻的分斷切除。
合上QS,按下SB1,結果如下
1)KM1線圈得電,觸頭(1-3)閉合自鎖;KM1線圈得電→KM1觸頭閉合→電動機M開始起動(R1、R2串入)運轉;KM1(1-5)觸頭閉合→KT1線圈通電→KT1(1-7)觸點延時閉合。
2)KM2線圈得電→KM2主觸頭閉合→R1被短接(切除);KM2(1-9)觸頭閉合→KT2線圈通電→KT2(1—1 1)觸點延時閉合。
3)KM3線圈通電→KM3主觸頭閉合→m被短接(切除)→起動過程結束。
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