A common feature of DC motors is?

A common feature of DC motors is?

• A. Commutator
• B. Rotor bearing
• C. Stator core
• D. Brush holder

Answer: (A)

Brushed DC motors rely on a commutator to switch current in the rotor windings as it spins. The commutator is a split metal ring mounted on the rotor, with copper segments insulated from one another, and carbon brushes maintaining contact with it. As the rotor turns, the arrangement of these segments reverses the connection of each winding to the power supply, so the direction of current through each winding flips at the right moment. This reversal keeps the torque in the same rotational direction, allowing continuous rotation from a DC source. Other parts like rotor bearings, the stator core, or the brush holder are common in many motor designs, but they don’t define how a DC motor operates the way the commutator does.

Brushed DC motors rely on a commutator to switch current in the rotor windings as it spins. The commutator is a split metal ring mounted on the rotor, with copper segments insulated from one another, and carbon brushes maintaining contact with it. As the rotor turns, the arrangement of these segments reverses the connection of each winding to the power supply, so the direction of current through each winding flips at the right moment. This reversal keeps the torque in the same rotational direction, allowing continuous rotation from a DC source. Other parts like rotor bearings, the stator core, or the brush holder are common in many motor designs, but they don’t define how a DC motor operates the way the commutator does.