Which of the following motor are manufactured without a comm

Which of the following motor are manufactured without a commutator? Select all that apply

Stepper motor

Permanent magnet DC motor

Brushless DC motor

AC induction motors

Solution

Commutator is used to alter dc voltage or current into ac voltage or current. Commutator is is used in dc motors.

The following that will use commutator which is in the list is only Permanent magnet DC motor. Input to this motor is DC input current where permanent magnet is field.

The following motor in the that donot use commutator are

stepper motor,.

Brushless DC motor.

AC induction motor.

The above three motors donot require commutator

stepper motor uses voltage to form electromagnet to the rotor at particular angle, which donot need to alter the voltage signal given to it.

Brushless DC motor works with the help of power electronic switches which alters the voltage as required by propoer switching of switches .

AC motor as the name indicates the input given is alternating voltage.