These are the small poles fixed to the yoke and spaced in between the main poles. They are wound with comparatively few heavy gauge copper wire turns and are connected in series with the armature so that they carry full armature current.Their polarity, in case of generator,is same that of main pole ahead in the direction of rotation.But in case of motor the pole polarity is opposite to direction. Inter poles reduce the commutation and also reduce the cross magnetization in their location due to that reason universally interpoles are used in dc machines.
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