1746-IM16

1746-IM16發(fā)電廠和電力網(wǎng)生產(chǎn)、輸送與分配的交流電都是三相交流電。這是因?yàn)槿嘟涣麟?具有許多優(yōu)點(diǎn)。在發(fā)電設(shè)備方面，三相交流發(fā)電機(jī)比同樣尺寸的單相交流發(fā)電機(jī)輸出功率大； 在輸電方面，三相供電制也較單相供電制節(jié)省材料；從用電的使用來(lái)看，生產(chǎn)中廣泛使用的三 相交流電動(dòng)機(jī)與直流電動(dòng)機(jī)及其他類型的交流電動(dòng)機(jī)相比，有性能優(yōu)良、結(jié)構(gòu)簡(jiǎn)單、價(jià)格低廉等優(yōu)點(diǎn)。 

【公　司】： 廈門泰尼電氣有限公司
【主　營(yíng)】： AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià)　格】： 電議
【發(fā)布人】： 張亮
【電  話】： 18030028083
【所在地】： 福建 - 廈門
【座　機(jī)】： 0592-6809819
【來(lái)　源】： 供應(yīng)信息 > 電工、電氣 > PLC
【Q　  Q】： 2314094943

概括地說(shuō),三相交流電是3個(gè)單相交流電的組合，這3個(gè)單相交流電的最大值相等，頻率相同,只是在相位上相差120°。 
圖1-13(a)所示的是三相交流發(fā)電機(jī)的示意圖。發(fā)電機(jī)的定子繞組分為3組，每組為一相，各相繞組在空間位置上彼此相差120°，對(duì)稱地嵌放在定子鐵芯內(nèi)側(cè)的線槽內(nèi)。顯然，它們 的始端（A、B、C和它們的末端(X、Y、Z)在空間位置上彼此相差120°。轉(zhuǎn)子上裝置著N，S兩個(gè)磁極，當(dāng)轉(zhuǎn)子以角速度以順時(shí)針?lè)较蛐D(zhuǎn)時(shí)，由于三相的繞組在鐵芯中放置的位置彼此相120°，所以一旦磁極轉(zhuǎn)到正對(duì)A-X繞組時(shí)，A相電動(dòng)勢(shì)達(dá)到最大值E，而B相繞組需要等轉(zhuǎn)子磁極轉(zhuǎn)1/3周（即120°)后,其中的電動(dòng)勢(shì)才達(dá)到最大值，也就是A相電動(dòng)勢(shì)超前B相電動(dòng)勢(shì)120°。同理，B相電動(dòng)勢(shì)超前C相電動(dòng)勢(shì)120°，C相電動(dòng)勢(shì)又超前于A相電動(dòng)勢(shì)120°。 很顯然，三相電動(dòng)勢(shì)的頻率相同，最大值相等,但初相角不同。假設(shè)A相電動(dòng)勢(shì)的初相角為0°，則B相為-120°，C相為120°。用三角函數(shù)式表示為： 

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