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該電路采用時(shí)間繼電器來(lái)控制轉(zhuǎn)子電阻的分?jǐn)嗲谐?br/>合上QS,按下SB1,結(jié)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(dòng)機(jī)M開(kāi)始起動(dòng)(R1、R2串入)運(yùn)轉(zhuǎn);KM1(1-5)觸頭閉合→KT1線圈通電→KT1(1-7)觸點(diǎn)延時(shí)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(diǎn)延時(shí)閉合。
3)KM3線圈通電→KM3主觸頭閉合→m被短接(切除)→起動(dòng)過(guò)程結(jié)束。
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