TLD132F
TLD132F
FR-A044-1.5K-UN
TLD132F
主磁極 主磁極的作用是建立主磁場。絕大多數(shù)直流電機(jī)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(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(jī)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(jī)座 ——機(jī)座有兩個作用,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,要流過較大的電流,因此和主磁極的串勵繞組一樣,導(dǎo)線有較大的截面。
福州卓凱電子科技有限公司
地址:福州市閩侯西江濱大道77號正榮潤園一號樓1205室
大量現(xiàn)貨abb,施耐德等國外多家品牌,產(chǎn)品涉及變頻器,儀器儀表,變送器,可編程控制器plc和人機(jī)界面。
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