（2）換向器 換向器的作用是與電刷配合，將直流電動機輸入的直流電流轉換成電樞繞組內的交變電流，或是將直流發電機電樞繞組中的交變電動勢轉換成輸出的直流電壓。
換向器是一個由許多燕尾狀的梯形銅片間隔云母片絕緣排列而成的圓柱體，每片換向片的一端有高出的部分，上面銑有線槽，供電樞繞組引出端焊接用。所有換向片均放置在與它配合的具有燕尾狀槽的金屬套簡內，然后用v形鋼環和螺紋壓圈將換向片和套筒緊固成一整體，換向片組與套筒、v形鋼環之間均要用云母片絕緣。
（3）轉軸 在轉軸上安裝電樞和換向器。
3．氣隙
靜止的磁極和旋轉的電樞之間的間隙稱為氣隙。在小容量電機中，氣隙為0.5～3mm。氣隙數值雖小，但磁阻很大，為電機磁路的主要組成部分。氣隙大小對電機運行性能有很大影響。
新聞:紅星區直線步進電機57HD76001-01批發
3.直流電機具有良好的啟動特性和調速特性。因此,在調速性能要求較高的大型設備,比如軋鋼機上都采用直流電動機拖動。但它存在著直流換向問題,結構復雜,維護檢修不方便,而且消耗有色金屬多。
一、直流電機的優點
1.直流電機具有良好的啟動特性和調速特性
2.直流電機的轉矩比較大
3.維修比較便宜。
4.直流電機的直流相對于交流比較節能環保。
二、直流電機的缺點
1.直流電機制造比較貴
2.有碳刷
新聞:紅星區直線步進電機57HD76001-01批發
為了實現上述目的所采取的設計方案是：將壓敏電阻和陶瓷氣體放電管的單相并聯式抗雷擊浪涌電路應用到儀表的電源上。主要分為防雷電路部分和開關電源電路部分，電路簡單，采用復合式對稱電路，共模、差摸全保護，可以不分L、N端連接。使壓敏電阻RV1位于貼片整流模塊前端分別與電源L、N并聯，主要來鉗位L、N線間電壓，壓敏電阻RV、RV2與陶瓷氣體放電管FD1串聯后接地，RV與FD1串聯主要是泄放L線上感應雷擊浪涌電流，RV2與FD1串聯主要是泄放由信號口串人24V參考電位上的能量，RV、RV2短路失效后，FD1可將其與電源電路分離，不會導致失火現象。
新聞:紅星區直線步進電機57HD76001-01批發
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不能在鉗口上敲擊工件，而應該在固定鉗身的平臺上，否則會損壞鉗口。絲杠、螺母和其他滑動表面要求經常保持清潔，并加油潤滑。熱點關注：熱點專題論如何讓每個人成為家裝高手？一把工具就夠了。熱點專題電動工具品牌之牧田：只為人士而生熱點資訊配角怎么了，你缺了它試試？五金配件選購要點五金百科木工常用切割工具鼻祖盤點手鋸的使用與注意事項精彩評測小巧便攜輕松鋸切。老A戶外1英寸快速折疊木工鋸精彩評測家裝維修不求人，贛春多功能自緊萬用扳手，多大的螺絲size均適用。
新聞:紅星區直線步進電機57HD76001-01批發
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