Slip Ring Induction Rotor

A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure.

Slip ring induction rotor.

An induction motor is an electrical device that converts electrical energy into mechanical energy. It is most widely used for industrial applications due to its self starting attribute. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. The rotor is wound for the same number of poles as that of the stator.

This article is devoted to slip ring induction motors. Adjusting the resistance allows control of the speed torque characteristic of the motor. 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. A wound rotor motor uses three slip rings typically made of copper or a copper alloy mounted to.

Slip ring induction motor is one of the types of 3 phase induction motor and is a wound rotor motor type. It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding. Learn more about the construction and operation of a slip ring induction motor. The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor.

It can improve mechanical performance simplify system operation and eliminate damage prone wires dangling from movable joints. 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. Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit. 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.

So a proper unidirectional torque is produced which can develop high starting torque. The function of a three phase slip ring induction motor is shown in the figure below. 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. Induction motors have been ruling the industrial world for many decades.

Due to the decrease in the inductive reactance the phase difference between the current and emf induced will be reduced. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements.