動(dòng)車組牽引系統(tǒng)維護(hù)與檢修鐵道動(dòng)力林桂清45課件

動(dòng)車組牽引系統(tǒng)維護(hù)與檢修主講教師：鐵道動(dòng)力系李笑2018年9月主講教師：鐵道動(dòng)力學(xué)院林桂清2項(xiàng)目五動(dòng)車組牽引電機(jī)維護(hù)與檢修任務(wù)5.2動(dòng)車組牽引電機(jī)工作原理AXBYCZ定子鐵心：由內(nèi)圓周有槽的硅鋼片疊成。A----XB----YC----Z三相繞組機(jī)座：鑄鋼或鑄鐵轉(zhuǎn)子鐵心：由外圓周有槽的硅鋼片疊成。轉(zhuǎn)子繞組:鼠籠式繞線式旋轉(zhuǎn)磁場(chǎng)的產(chǎn)生o規(guī)定：i:“+”首端流入，尾端流出。i:“-”尾端流入，首端流出。AYCBZX(?)電流出(

)電流入改變旋轉(zhuǎn)磁場(chǎng)的轉(zhuǎn)向AXYCBZAXYCBZ旋轉(zhuǎn)方向：取決于三相電流的相序。改變電機(jī)的旋轉(zhuǎn)方向：換接其中兩相。旋轉(zhuǎn)磁場(chǎng)的旋轉(zhuǎn)方向旋轉(zhuǎn)磁場(chǎng)的極對(duì)數(shù)P

當(dāng)三相定子繞組按圖示排列時(shí)，產(chǎn)生一對(duì)磁極的旋轉(zhuǎn)磁場(chǎng)，即：o

tAXBYCZAXYCBZP=1旋轉(zhuǎn)磁場(chǎng)的極對(duì)數(shù)P

若定子每相繞組由兩個(gè)線圈串聯(lián)

，繞組的始端之間互差60°，將形成兩對(duì)磁極的旋轉(zhuǎn)磁場(chǎng)。C'Y'ABCXYZA'X'B'Z'AXBYC極對(duì)數(shù)旋轉(zhuǎn)磁場(chǎng)的磁極對(duì)數(shù)與三相繞組的排列有關(guān)C'Y'ABCXYZA'X'B'Z'0旋轉(zhuǎn)磁場(chǎng)的轉(zhuǎn)速工頻：p=1時(shí)0

toAXYCBZAXYCBZAXYCBZp=2時(shí)0

旋轉(zhuǎn)磁場(chǎng)的轉(zhuǎn)速取決于磁場(chǎng)的極對(duì)數(shù)旋轉(zhuǎn)磁場(chǎng)轉(zhuǎn)速n0與極對(duì)數(shù)p的關(guān)系極對(duì)數(shù)每個(gè)電流周期磁場(chǎng)轉(zhuǎn)過的空間角度同步轉(zhuǎn)速旋轉(zhuǎn)磁場(chǎng)轉(zhuǎn)速n0與頻率f1和極對(duì)數(shù)p有關(guān)?？梢?電動(dòng)機(jī)的轉(zhuǎn)動(dòng)原理AXYCBZ定子三相繞組通入三相交流電方向:順時(shí)針

切割轉(zhuǎn)子導(dǎo)體右手定則感應(yīng)電動(dòng)勢(shì)E20旋轉(zhuǎn)磁場(chǎng)感應(yīng)電流I2旋轉(zhuǎn)磁場(chǎng)左手定則電磁力FF電磁轉(zhuǎn)矩TnF機(jī)械負(fù)載旋轉(zhuǎn)起來對(duì)稱三相繞組通入對(duì)稱三相電流旋轉(zhuǎn)磁場(chǎng)（磁場(chǎng)能量）磁感線切割轉(zhuǎn)子繞組轉(zhuǎn)子繞組中產(chǎn)生e和i轉(zhuǎn)子繞組在磁場(chǎng)中受到電磁力的作用轉(zhuǎn)子旋轉(zhuǎn)