Electrical neutral is adjusted by shifting the _______ location with respect to the _______.

Electrical neutral is adjusted by shifting the _______ location with respect to the _______.

• A. Brush, commutator
• B. Commutator, brush
• C. Brush, rotor
• D. Stator, rotor

Answer: (A)

Electrical neutral is the position along the armature where the induced emf in a conductor is zero. Under load, armature reaction shifts this neutral plane, so to get clean commutation you move the contact point where the brushes touch the commutator. By shifting the brush location relative to the commutator, you realign the neutral plane with the zone where current reversal occurs, which minimizes sparking and ensures the commutator switches current at the correct moment. The rotor and stator positions are fixed in normal operation, so adjusting the brushes relative to the commutator is the way to compensate for shifts in the neutral plane.

Electrical neutral is the position along the armature where the induced emf in a conductor is zero. Under load, armature reaction shifts this neutral plane, so to get clean commutation you move the contact point where the brushes touch the commutator. By shifting the brush location relative to the commutator, you realign the neutral plane with the zone where current reversal occurs, which minimizes sparking and ensures the commutator switches current at the correct moment. The rotor and stator positions are fixed in normal operation, so adjusting the brushes relative to the commutator is the way to compensate for shifts in the neutral plane.