the armature current is brought thru the interpole winding near the brushes this shifts the electrical null to reduce arcing with heavy loads there were arrangements with small motors to shift the brush holder rings but the interpole has no moving parts and works under all loading conditions
For a D.C motor it is the field windings which must always be in series with the armature windings.
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"Hotel" is the full form of the word. It is derived from the French hôtel, from Old French hostel.
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There is no "full form".
no full form.
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The full form of something is the words that make up an acronym. For example, the full form of MBA is the Major League Baseball Association.