A slip ring motor also called a wound-rotor induction motor, is a kind of electromagnetic induction motor. It is a type of induction motor, and this is a type of motor in which its external circuit is connected using multiple rings.
Rotor windings are connected through slip rings with external resistance.
These high resistance rings act as an external circuit for the rotor. Resistance controls the Torque and speed of the motor. Wound rotor motors can be started with a low starting current by adding high resistance to the rotor circuit; as the motor accelerates, the resistance may decrease.
A slip ring motor is a kind of magnetic induction motor in which the winding rotor shafts are energized by an alternating magnetic field and wound around some gear wheel. The gear wheel helps the winding rotors rotate quickly, and at the same time, it helps increase the friction between the rotors and the gear wheel
This increase in friction gives the power to rotate the shaft in a circular motion. The increased power can be harnessed, and the energy can be converted into electrical energy for use. The best part of a wound slip ring motor is that it can be made to vary the rotary torque depending upon the requirement of the application.
Working Principle of Silp ring Motor
The principle of operation of the slip ring motor of this electric motor is similar to the operation of a common electric motor. Except for some additional functions performed in this motor, which adds to the benefits. When three-phase power is applied to the stator of a three-phase motor.
It is manufactured by an RMF that rotates in an air gap in the stator. This RMF cuts the rotor windings, e whenever a magnetic field is applied to a current-carrying conductor, an EMF is generated. When this RMF cuts off the current-carrying rotor windings, the EMF will be induced by the principle of electromagnetic induction.
This induced EMF will create the force indicated by Lorentz. This generated EMF will develop the torque that must rotate the rotor. The generated torque is not unidirectional for rotation. Since the motor is inductive, the phase difference is also high.
This motor works according to the principle of Faraday’s law of electromagnetic induction. When an AC source energizes the stator winding, the stator winding generates magnetic flux. Based on Faraday’s law of electromagnetic induction, the rotor winding is induced and generates a magnetic flux currently. This induced EMF creates a torque that allows the rotor to rotate.