直流測速發(fā)電機(jī)誤差及減小誤差方法
實(shí)際上直流測速發(fā)電機(jī)的輸出特性 并不是嚴(yán)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(yīng)的影響
當(dāng)直流測速發(fā)電機(jī)帶負(fù)載時(shí),負(fù)載電流流經(jīng)電樞,產(chǎn)生電樞反應(yīng)的去磁作用,使電機(jī)氣隙磁通減小。因此,在相同轉(zhuǎn)速下,負(fù)載時(shí)電樞繞組的感應(yīng)電動(dòng)勢比在空載時(shí)電樞繞組的感應(yīng)電動(dòng)勢小。負(fù)載電阻越小或轉(zhuǎn)速越高,電樞電流就越大,電樞反應(yīng)的去磁作用越強(qiáng),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(yīng)對輸出特性的影響,應(yīng)盡量使電機(jī)的氣隙磁通保持不變。通常采取以下一些措施:
(1)對電磁式直流測速發(fā)電機(jī),在定子磁極上安裝補(bǔ)償繞組。有時(shí)為了調(diào)節(jié)補(bǔ)償?shù)某潭?,還接有分流電阻。
?。?)在設(shè)計(jì)電機(jī)時(shí),選擇較小的線負(fù)荷和較大的空氣隙。
?。?)在使用時(shí),轉(zhuǎn)速不應(yīng)超過線性工作轉(zhuǎn)速,所接負(fù)載電阻不應(yīng)小于負(fù)載電阻。
新聞:西寧V-CUT機(jī)專用步進(jìn)電機(jī)SL57S283AD24廠家
3、什么叫不匹配,這與碰撞理論一致,當(dāng)一個(gè)物體與另一個(gè)慣量相比無窮大的物體發(fā)生碰撞時(shí),則會(huì)發(fā)生這個(gè)物體的動(dòng)量狀態(tài)翻轉(zhuǎn),而慣量無窮大的物體運(yùn)動(dòng)狀態(tài)不變,我們稱此種現(xiàn)象為慣量不匹配;
4、所以電機(jī)的轉(zhuǎn)動(dòng)慣量與負(fù)載的轉(zhuǎn)動(dòng)慣量相等時(shí)(傳動(dòng)比=1),為慣量匹配;
5、如果傳動(dòng)比=10,那么電機(jī)的轉(zhuǎn)動(dòng)慣量等于負(fù)載折算到電機(jī)軸的慣量(負(fù)載慣量/100),為慣量匹配;
新聞:西寧V-CUT機(jī)專用步進(jìn)電機(jī)SL57S283AD24廠家
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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?yàn)椋夯瘜W(xué)成分當(dāng)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(dá)到一定數(shù)值時(shí)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(shí)采用15~18℃固溶處理可以把鐵素體完全溶入奧氏體就不會(huì)有磁性了。冷加工硬化。當(dāng)奧氏體不銹鋼在冷加工時(shí)產(chǎn)生形變馬氏體,形變馬氏體使得不銹鋼強(qiáng)度增加,而形變馬氏體是有磁性的。
新聞:西寧V-CUT機(jī)專用步進(jìn)電機(jī)SL57S283AD24廠家
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SKF進(jìn)口軸承潤滑的方法,分為脂潤滑和油潤滑。為了使SKF進(jìn)口軸承很好地發(fā)揮機(jī)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(jìn)口軸承周圍結(jié)構(gòu)的特長。液壓泵用SKF進(jìn)口軸承柱塞泵重要的部件是軸承,降低SKF進(jìn)口軸承中的負(fù)壓是防止水進(jìn)入的基本要求,角接觸軸承的載荷計(jì)算,機(jī)車軸承的給油保養(yǎng)十分重要,電動(dòng)機(jī)SKF進(jìn)口軸承為什么會(huì)過熱的原因。
新聞:西寧V-CUT機(jī)專用步進(jìn)電機(jī)SL57S283AD24廠家
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