ABB PLC控制器fi820
又称主极。在一般大中型直流电机中，主磁极是一种电磁铁。只有个别类型的小型直流电机的主磁极才用磁铁，这种电机叫永磁直流电机。主磁极的作用是能够在电枢表面外的气隙空间里产生形状分布的气隙磁密。
图2是主磁极的装配图。主磁极的铁心用1~1.5mm厚的低碳钢板冲片叠压紧固而成。把事先绕制好的励磁绕组套在主极铁心外面，整个主磁极再用螺钉固定在机座的内表面上。各主磁极上的励磁绕组联接使通过励磁电流时，相邻磁极的极性呈极和极交替的排列，为了让气隙磁密沿电枢圆周方向的气隙空间里分布得更加合理一些，铁心下部（称为极靴）比套绕组的部分（称为极身）宽。这样也可使励磁绕组牢固地套在铁心上。
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