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交流同步電動(dòng)機(jī)

電動(dòng)機(jī)在起動(dòng)瞬間,轉(zhuǎn)子是靜止的,反電勢尚未建立

發(fā)布日期:2022-04-18 點(diǎn)擊率:49

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動(dòng)機(jī)起動(dòng)電流倍率選定是整定計(jì)算的另一個(gè)因素。電動(dòng)機(jī)在起動(dòng)瞬間,轉(zhuǎn)子是靜止的,反電勢尚未建立,形如堵轉(zhuǎn),相當(dāng)于電動(dòng)機(jī)短路。轉(zhuǎn)子轉(zhuǎn)動(dòng)以后,電動(dòng)機(jī)的反電勢隨轉(zhuǎn)子的加速而上升,起動(dòng)電流逐漸接近額定值。

 

1、電機(jī)啟動(dòng)瞬間,電機(jī)的反電勢隨著電源電壓平衡同時(shí)建立;

2、也就是說,電機(jī)啟動(dòng)瞬間,旋轉(zhuǎn)磁場即刻建立,但由于轉(zhuǎn)子轉(zhuǎn)速是零,轉(zhuǎn)子感應(yīng)電勢最大,感應(yīng)電流最大,相當(dāng)于變壓器短路運(yùn)行狀態(tài);

3、轉(zhuǎn)子轉(zhuǎn)動(dòng)以后,電動(dòng)機(jī)的轉(zhuǎn)子的加速而上升,轉(zhuǎn)子感應(yīng)電勢、感應(yīng)電流下降,起動(dòng)電流逐漸接近額定值!

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