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C500-MP303
35313721A
C500-MP303
主磁極 主磁極的作用是建立主磁場(chǎng)。絕大多數(shù)直流電機(jī)的主磁極不是用磁鐵而是由勵(lì)磁繞組通以直流電流來(lái)建立磁場(chǎng)。主磁極由主磁極鐵心和套裝在鐵心上的勵(lì)磁繞組構(gòu)成。主磁極鐵心靠近轉(zhuǎn)子一端的擴(kuò)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(chǎng)分布，并使勵(lì)磁繞組容易固定。為了減少轉(zhuǎn)子轉(zhuǎn)動(dòng)時(shí)由于齒槽移動(dòng)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(lì)磁繞組，整個(gè)主磁極用螺桿固定在機(jī)座上。主磁極的個(gè)數(shù)一定是偶數(shù)，勵(lì)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(jī)座 ——機(jī)座有兩個(gè)作用，一是作為主磁極的一部分，二是作為電機(jī)的結(jié)構(gòu)框架。 機(jī)座中作為磁通通路疊部分稱為磁軛。機(jī)座一般用厚鋼板彎成筒形以后焊成，或者用鑄鋼件（小型機(jī)座用鑄鐵件）制成。機(jī)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(gè)小磁極，它的作用是改善直流電機(jī)的換向情況，使電機(jī)運(yùn)行時(shí)不產(chǎn)生有害的火花。換向極結(jié)構(gòu)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(gòu)成，并用螺桿固定在機(jī)座上。換向極的個(gè)數(shù)一般與主磁極的極數(shù)相等，在功率很小的直流電機(jī)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(guò)較大的電流，因此和主磁極的串勵(lì)繞組一樣，導(dǎo)線有較大的截面。
福州卓凱電子科技有限公司
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