Slip Ring Induction Motor Rotor

Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit.

Slip ring induction motor rotor.

The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor. A wound rotor motor also known as slip ring rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance. An induction motor is an electrical device that converts electrical energy into mechanical energy. Induction motors have been ruling the industrial world for many decades.

The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor but the construction of its rotor is very much different stator winding can be either star or delta connected depending upon the design. In the induction motors used in lift and hoists you will see a type of rotor called a slip ring rotor whereas in most of the other applications you will see a simpler squirrel cage type of rotor. Rotor as the name suggests it is a rotating part of an electrical machine in which current is induced by transformer action from rotating magnetic field. Squirrel cage rotor wound type rotor or slip ring type rotor squirrel cage rotor in this type.

In a version of the ac induction motor referred to as a wound rotor motor slip rings are used not for transferring power but for inserting resistance into the rotor windings a wound rotor motor uses three slip rings typically made of copper or a copper alloy mounted to but insulated from the motor shaft. Induction motor rotor is of two types. What is slip ring induction motor. This rings attached with high resistance acts as an external circuit for the rotor.

The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. It is a type of motor where its external circuit is connected using some rings. As the motor accelerates. Some changes in the stator may be encountered when a slip ring motor is used in a cascaded system as the supply for the slave motor is controlled by the supply from the rotor of the other slip ring motor with external resistance mounted on its rotor.

It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding. The main difference in a slip ring induction motor is on the rotor construction and usage. This external circuit helps in developing a high starting torque compared to a squirrel cage type. Adjusting the resistance allows control of the speed torque characteristic of the motor.