直流測速發(fā)電機誤差及減小誤差方法
實際上直流測速發(fā)電機的輸出特性 并不是嚴格的線性特性,而與線性特性之間存在有誤差。下面討論產(chǎn)生誤差的原因及減小誤差的方法。
1.電樞反應的影響
當直流測速發(fā)電機帶負載時,負載電流流經(jīng)電樞,產(chǎn)生電樞反應的去磁作用,使電機氣隙磁通減小。因此,在相同轉(zhuǎn)速下,負載時電樞繞組的感應電動勢比在空載時電樞繞組的感應電動勢小。負載電阻越小或轉(zhuǎn)速越高,電樞電流就越大,電樞反應的去磁作用越強,氣隙磁通減小的越多,輸出電壓下降越顯著。
為了減小電樞反應對輸出特性的影響,應盡量使電機的氣隙磁通保持不變。通常采取以下一些措施:
?。?)對電磁式直流測速發(fā)電機,在定子磁極上安裝補償繞組。有時為了調(diào)節(jié)補償?shù)某潭?,還接有分流電阻。
?。?)在設計電機時,選擇較小的線負荷和較大的空氣隙。
?。?)在使用時,轉(zhuǎn)速不應超過線性工作轉(zhuǎn)速,所接負載電阻不應小于負載電阻。
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3、什么叫不匹配,這與碰撞理論一致,當一個物體與另一個慣量相比無窮大的物體發(fā)生碰撞時,則會發(fā)生這個物體的動量狀態(tài)翻轉(zhuǎn),而慣量無窮大的物體運動狀態(tài)不變,我們稱此種現(xiàn)象為慣量不匹配;
4、所以電機的轉(zhuǎn)動慣量與負載的轉(zhuǎn)動慣量相等時(傳動比=1),為慣量匹配;
5、如果傳動比=10,那么電機的轉(zhuǎn)動慣量等于負載折算到電機軸的慣量(負載慣量/100),為慣量匹配;
新聞:西寧V-CUT機專用步進電機SL57S283AD24廠家
![新聞:西寧V-CUT機專用步進電機SL57S283AD24廠家](http://img.jdzj.com/UserDocument/mallpic/eastour001/Picture/200715100317180.png)
一般情況下,使用沒有磁性的34不銹鋼廢料澆注出來的鑄件產(chǎn)品卻帶有微磁性。什么原因?qū)е碌哪??因為:化學成分當量成分控制沒有到位。一般的生產(chǎn)廠家為了降低成本把Ni控制下限,8.-8.2%之間,Cr/Ni達到一定數(shù)值時鋼的組織中出現(xiàn)一定量的鐵素體,鐵素體是有磁性的;此時采用15~18℃固溶處理可以把鐵素體完全溶入奧氏體就不會有磁性了。冷加工硬化。當奧氏體不銹鋼在冷加工時產(chǎn)生形變馬氏體,形變馬氏體使得不銹鋼強度增加,而形變馬氏體是有磁性的。
新聞:西寧V-CUT機專用步進電機SL57S283AD24廠家
![新聞:西寧V-CUT機專用步進電機SL57S283AD24廠家](http://img.jdzj.com/UserDocument/mallpic/eastour001/Picture/200715100259196.png)
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SKF進口軸承潤滑的方法,分為脂潤滑和油潤滑。為了使SKF進口軸承很好地發(fā)揮機能,首先,要選擇適合使用條件、使用目的的潤滑方法。若只考慮潤滑,油潤滑的潤滑性占優(yōu)勢。但是脂潤滑有可以簡化SKF進口軸承周圍結構的特長。液壓泵用SKF進口軸承柱塞泵重要的部件是軸承,降低SKF進口軸承中的負壓是防止水進入的基本要求,角接觸軸承的載荷計算,機車軸承的給油保養(yǎng)十分重要,電動機SKF進口軸承為什么會過熱的原因。
新聞:西寧V-CUT機專用步進電機SL57S283AD24廠家
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