ABB產品fi820f
容量在1kw以上的直流電機，在相鄰兩主磁極之間要裝上換向極。換向極又稱附加極或間極，其作用為了改善直流電機的換向，至於如何改善換向的，將在後面介紹。
換向極的形狀比主磁極簡單，也是由鐵心和繞組構成。鐵心一般用整塊鋼或鋼板加工而成。換向極繞組與電樞繞組串聯。
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