描述
振動(dòng)振速(烈度)不超標(biāo),振動(dòng)加速度超標(biāo),只能更換軸承。
二極大功率電機(jī)的轉(zhuǎn)子由于剛性差,長(zhǎng)時(shí)間不用轉(zhuǎn)子會(huì)變形,再轉(zhuǎn)時(shí)可能會(huì)振動(dòng),這是電機(jī)保管不善的原因,正常情況下,二極電機(jī)儲(chǔ)存期間。每隔15天要對(duì)電機(jī)盤(pán)車,每次盤(pán)車至少轉(zhuǎn)動(dòng)8圈以上。
滑動(dòng)軸承的電機(jī)振動(dòng)和軸瓦的裝配質(zhì)量有關(guān),應(yīng)檢查軸瓦是否有高點(diǎn),軸瓦的進(jìn)油是否夠、軸瓦緊力、軸瓦間隙、磁力中心線是否合適。
一般情況下,電機(jī)振動(dòng)的原因,可以從三個(gè)方向的振動(dòng)值大小做簡(jiǎn)單的判斷,水平振動(dòng)大,轉(zhuǎn)子不平衡;垂直振動(dòng)大,安裝基礎(chǔ)不平不好;軸向振動(dòng)大,軸承裝配質(zhì)量差。這只是簡(jiǎn)單判斷,要根據(jù)現(xiàn)場(chǎng)情況,結(jié)合以上所述的因素綜合考慮,查找振動(dòng)的真實(shí)原因。
Y系列箱式電機(jī)的振動(dòng)應(yīng)特別注意軸向振動(dòng),如軸向振動(dòng)大于徑向振動(dòng),對(duì)電機(jī)軸承的危害極大,會(huì)引起抱軸事故。要注意觀察軸承溫度,如定位軸承比非定位軸承升溫速度快,應(yīng)立即停機(jī)。這是因?yàn)闄C(jī)座的軸向剛度不夠引起的軸向振動(dòng),應(yīng)加固機(jī)座。
轉(zhuǎn)子經(jīng)動(dòng)平衡后,轉(zhuǎn)子的殘余不平衡量已經(jīng)固化在轉(zhuǎn)子上,不會(huì)改變,電機(jī)本身的振動(dòng)也不會(huì)隨著地點(diǎn)、工況的變化而變化,在用戶現(xiàn)場(chǎng)是能處理好振動(dòng)問(wèn)題的。一般情況下,檢修電機(jī)不需要對(duì)電機(jī)再做動(dòng)平衡校驗(yàn),除了極特別的情況,如柔性基礎(chǔ)、轉(zhuǎn)子變形等,須做現(xiàn)場(chǎng)動(dòng)平衡或返廠處理。
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