In which type of motor is a commutator used?

A commutator is a mechanical switch used in specific types of electric motors to ensure that the direction of current and the magnetic field are aligned properly for effective rotation. It is primarily found in DC motors, where it serves the purpose of reversing the current direction in the rotor winding each half cycle, ensuring continuous rotation in one direction.

In DC motors, as the rotor turns, the commutator segments alternate the current direction in the coils, maintaining the torque and enabling smooth operation. This feature is essential since DC motors rely on a consistent magnetic field generated by permanent magnets or electromagnets.

While universal motors can operate on both AC and DC power and do possess a commutator, they are not solely classified as DC motors. AC motors, on the other hand, typically do not use commutators. Instead, they rely on alternating current to create the magnetic field, allowing for different operational mechanisms, like induction or synchronous methods.

Thus, the correct identification of a motor type that uses a commutator is accurately found in DC motors.