點擊圖片查看大圖S8600B1025 S8600B3005 S8600B3013
S8600B1025 S8600B3005 S8600B3013
A20B-1002-0580/02B
S8600B1025 S8600B3005 S8600B3013
主磁極 主磁極的作用是建立主磁場。絕大多數(shù)直流電機的主磁極不是用磁鐵而是由勵磁繞組通以直流電流來建立磁場。主磁極由主磁極鐵心和套裝在鐵心上的勵磁繞組構成。主磁極鐵心靠近轉(zhuǎn)子一端的擴大的部分稱為極靴，它的作用是使氣隙磁阻減小，改善主磁極磁場分布，并使勵磁繞組容易固定。為了減少轉(zhuǎn)子轉(zhuǎn)動時由于齒槽移動引起的鐵耗，主磁極鐵心采用1～1.5mm的低碳鋼板沖壓一定形狀疊裝固定而成。主磁極上裝有勵磁繞組，整個主磁極用螺桿固定在機座上。主磁極的個數(shù)一定是偶數(shù)，勵磁繞組的連接必須使得相鄰主磁極的極性按 N，S 極交替出現(xiàn)。
機座 ——機座有兩個作用，一是作為主磁極的一部分，二是作為電機的結(jié)構框架。 機座中作為磁通通路疊部分稱為磁軛。機座一般用厚鋼板彎成筒形以后焊成，或者用鑄鋼件（小型機座用鑄鐵件）制成。機座的兩端裝有端蓋。
換向極 ——換向極是安裝在兩相鄰主磁極之間的一個小磁極，它的作用是改善直流電機的換向情況，使電機運行時不產(chǎn)生有害的火花。換向極結(jié)構和主磁極類似，是由換向極鐵心和套在鐵心上的換向極繞組構成，并用螺桿固定在機座上。換向極的個數(shù)一般與主磁極的極數(shù)相等，在功率很小的直流電機中，也有不裝換向極的。換向極繞組在使用中是和電樞繞組相串聯(lián)的，要流過較大的電流，因此和主磁極的串勵繞組一樣，導線有較大的截面。
福州卓凱電子科技有限公司
地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室
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