軌道交通電工基本技能與實(shí)訓(xùn)課件 任務(wù)10.2三相異步電動(dòng)機(jī)雙向啟動(dòng)能耗制動(dòng)控制

任務(wù)10.2：三相異步電動(dòng)機(jī)雙向啟動(dòng)能耗制動(dòng)控制按圖連接三相異步電機(jī)正轉(zhuǎn)、反轉(zhuǎn)、停車時(shí)能耗制動(dòng)的控制電路，要求：1.

將能耗制動(dòng)的時(shí)間整定為5S；2.假定電動(dòng)機(jī)的額定功率為3KW，求整定熱繼電器的動(dòng)作電流。SB1SB2SB3SB3SB1一、電路結(jié)構(gòu)分析（1）+1、我們先看控制電路因此，我們得出結(jié)論：控制電路由原來學(xué)過的正反轉(zhuǎn)控制電路和將要學(xué)習(xí)能耗制動(dòng)控制電路組成。一、電路結(jié)構(gòu)分析（2）+2、我們?cè)倏粗麟娐芬虼?，我們同樣得出結(jié)論：主電路也由原來學(xué)過的正反轉(zhuǎn)控制電路和將要學(xué)習(xí)的能耗制動(dòng)控制電路組成。一、電路結(jié)構(gòu)分析（3）

3、復(fù)合按鈕（停止按鈕SB1）的結(jié)構(gòu)補(bǔ)充：按鈕聯(lián)鎖的正反轉(zhuǎn)控制線路M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖按下正轉(zhuǎn)按鈕SB2SB2常閉點(diǎn)斷開補(bǔ)充：按鈕聯(lián)鎖的正反轉(zhuǎn)控制線路M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖補(bǔ)充：按鈕聯(lián)鎖的正反轉(zhuǎn)控制線路M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖KM1線圈得電M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖KM1主觸點(diǎn)閉合KM1常開輔助觸點(diǎn)閉合自鎖電機(jī)正轉(zhuǎn)M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖松開正轉(zhuǎn)按鈕SB2電機(jī)依然正傳試想：若此時(shí)按下反轉(zhuǎn)按鈕SB3主電路會(huì)短路嗎？為什么？試想：若此時(shí)按下反轉(zhuǎn)按鈕SB3能夠直接實(shí)現(xiàn)反轉(zhuǎn)嗎？M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖按下反轉(zhuǎn)按鈕SB3M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖KM2線圈得電KM1自鎖觸點(diǎn)打開KM1主觸點(diǎn)打開M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖KM2線圈得電M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2按鈕聯(lián)鎖正反轉(zhuǎn)制線路圖電機(jī)反轉(zhuǎn)KM2主觸點(diǎn)閉合KM2常開輔助觸點(diǎn)閉合自鎖引申：雙重聯(lián)鎖的正反轉(zhuǎn)控制線路

即在電路中即利用到了接觸器的互鎖，又利用到了按鈕的聯(lián)鎖，實(shí)現(xiàn)了雙重保護(hù)，使電路更加安全。電路結(jié)構(gòu)電路原理電路實(shí)訓(xùn)電路結(jié)構(gòu)

電源電路：L1、L2、L3、QS主電路：FU1、KM1、KM2主觸頭、FR、電機(jī)控制電路：FU2、FR常閉觸頭、SB3正轉(zhuǎn)控制電路：SB1常開、KM1自鎖觸頭、KM2聯(lián)鎖觸頭、SB2聯(lián)鎖按鈕、KM1線圈反轉(zhuǎn)控制電路：SB2常開、KM2自鎖觸頭、KM1聯(lián)鎖觸頭、SB1聯(lián)鎖按鈕、KM2線圈引申：雙重聯(lián)鎖的正反轉(zhuǎn)控制線路正轉(zhuǎn)控制反轉(zhuǎn)控制引申：雙重聯(lián)鎖的正反轉(zhuǎn)控制線路電路工作原理M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖引申：雙重聯(lián)鎖的正反轉(zhuǎn)控制線路M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖按下正轉(zhuǎn)按鈕SB2引申：雙重聯(lián)鎖的正反轉(zhuǎn)控制線路M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖KM1線圈得電M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖KM1主觸點(diǎn)閉合KM1常開輔助觸點(diǎn)閉合自鎖電機(jī)正轉(zhuǎn)KM1常閉輔助觸點(diǎn)打開互鎖M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖松開正轉(zhuǎn)按鈕SB2電機(jī)依然正傳M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM2KM1雙重聯(lián)鎖正反轉(zhuǎn)制線路圖按下反轉(zhuǎn)按鈕SB3M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM1KM2雙重聯(lián)鎖正反轉(zhuǎn)制線路圖KM1線圈失電M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM1KM2雙重聯(lián)鎖正反轉(zhuǎn)制線路圖KM1自鎖觸點(diǎn)打開KM1主觸點(diǎn)打開KM1互鎖觸電閉合M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM1KM2雙重聯(lián)鎖正反轉(zhuǎn)制線路圖KM2線圈得電M3~KM1KM2KM1KM1FRSB1SB2L2L1L3QFFU1FU2SB3KM2KM2KM1KM2雙重聯(lián)鎖正反轉(zhuǎn)制線路圖電機(jī)反轉(zhuǎn)KM2主觸點(diǎn)閉合KM2常開輔助觸點(diǎn)閉合自鎖KM2常閉輔助觸電打開互鎖SB1↓KM1線圈得電KM1主觸頭閉合KM1自鎖觸頭閉合電動(dòng)機(jī)得電啟動(dòng)正轉(zhuǎn)連續(xù)運(yùn)行KM1對(duì)KM2聯(lián)鎖SB1常閉觸頭先分?jǐn)?，?duì)KM2聯(lián)鎖SB1常開觸頭后閉合正轉(zhuǎn)控