CX8093

采用雙數(shù)槽轉(zhuǎn)子時(shí)，不會(huì)發(fā)生上述情況，但轉(zhuǎn)子旋轉(zhuǎn)時(shí)槽位變化，在氣隙中造成脈振磁場(chǎng)，也可能引起振動(dòng)。

按照上面分析，所產(chǎn)生的電磁噪聲頻率

式中：Z ——轉(zhuǎn)子槽數(shù)

在電磁噪聲中，除上述原因所產(chǎn)生的噪聲外，還由于電流中的高次諧波分量，在定轉(zhuǎn)子氣產(chǎn)生諧波磁場(chǎng)，也會(huì)產(chǎn)生不均勻的力矩，造成振動(dòng)而產(chǎn)生噪聲。

噪聲鑒別方法

1. 斷電法

利用電磁噪聲隨磁場(chǎng)強(qiáng)弱、負(fù)載電流大小以及轉(zhuǎn)換高低而變的特征，對(duì)空載運(yùn)行的電動(dòng)機(jī)靜聽一段時(shí)間后突然切斷電源，隨著電源的切斷部分噪聲會(huì)立即消失，此為電磁噪聲。停電后電機(jī)借慣性繼續(xù)運(yùn)轉(zhuǎn)產(chǎn)生的噪聲則為機(jī)械噪聲。反復(fù)數(shù)次以期得到確定。

2. 改變電壓法

將電源電壓急速下降至限度（轉(zhuǎn)速無較大變化）時(shí)，如果電磁噪聲是電機(jī)噪聲的主要部分，則會(huì)隨電壓變化很大，而其他噪聲基本不變。

3. 電流測(cè)試法

若定子繞組不對(duì)稱或內(nèi)部斷相、匝間短路，則三相電流不平衡;若轉(zhuǎn)子斷籠或繞線式電機(jī)轉(zhuǎn)子三相不對(duì)稱，則定子電流有波動(dòng)，以此來鑒別出電磁噪聲。

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