Question

What is the role of the split ring in an electric motor?

Answer 1

Hint: The split ring, also known as a commutator in an electric motor, is made up of a simple ring or cylindrical shell that is split axially with the parts insulated from each other. Magnetism, electrostatics, and piezoelectricity are the three physical principles that drive electric motors

Complete step by step answer:
The split ring is used to reverse the coil's current direction. The coil's current must be reversed in order for it to continue rotating in the same direction. As a result, the direction of the couple rotating the coil remains the same after every half rotation, and the coil continues to rotate in the same direction.
An electric motor is a machine that converts electricity into mechanical energy. The interaction between the motor's magnetic field and electric current in a wire winding generates force in the form of torque applied to the motor's shaft in most electric motors.
The coil in an electric motor experiences torque to align its magnetic moment in the direction of the magnetic field because the direction of the magnetic field remains constant. The direction of the magnetic moment must change after the coil aligns its magnetic moment in the direction of the magnetic field. This can be accomplished by providing an AC supply, in which current changes direction periodically, or by using split rings as a commutator, in which the direction of current changes in the coil while the direction of current through the supply remains constant, as in the case of a DC supply.

Note: Variable-speed DC motors can be controlled by varying the DC voltage applied to the terminals or by using pulse-width modulation (PWM). Magnetic fields form in both the rotor and the stator of magnetic motors. The product of these two fields produces a force and, as a result, a torque on the motor shaft. With the rotation of the rotor, one or both of these fields must change. This is accomplished by turning the poles on and off at the appropriate times, or by varying the pole's strength.