描述
電機(jī)混合原因
(1)電機(jī)振動往往是氣隙不勻,引起單邊電磁拉力,而單邊電磁拉力又使氣隙進(jìn)一步增大,這種機(jī)電混合作用表現(xiàn)為電機(jī)振動。
(2)電機(jī)軸向串動,由于轉(zhuǎn)子本身重力或安裝水平以及磁力中心不對,引起的電磁拉力,造成電機(jī)軸向串動,引起電機(jī)振動加大,嚴(yán)重情況下發(fā)生軸磨瓦根,使軸瓦溫度迅速升高。
(3)與電機(jī)相聯(lián)的齒輪、聯(lián)軸器有毛病。這種故障主要表現(xiàn)為齒輪咬合不良,輪齒磨損嚴(yán)重,對輪潤滑不良,聯(lián)軸器歪斜、錯位,齒式聯(lián)軸器齒形、齒距不對、間隙過大或磨損嚴(yán)重,都會造成一定的振動。
(4)電機(jī)本身結(jié)構(gòu)的缺陷和安裝的問題。這種故障主要表現(xiàn)為軸頸橢圓,轉(zhuǎn)軸彎曲,軸與軸瓦間間隙過大或過小,軸承座、基礎(chǔ)板、地基的某部分乃至整個電機(jī)安裝基礎(chǔ)的剛度不夠,電機(jī)與基礎(chǔ)板之間固定不牢,底腳螺栓松動,軸承座與基礎(chǔ)板之間松動等。而軸與軸瓦間間隙過大或過小不僅可以造成振動還可使軸瓦的潤滑和溫度產(chǎn)生異常。
(5)電機(jī)拖動的負(fù)載傳導(dǎo)振動。例如:汽輪發(fā)電機(jī)的汽輪機(jī)振動,電機(jī)拖動的風(fēng)機(jī)、水泵振動,引起電機(jī)振動。
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