Slip Ring Induction Motor Rotor Connection

Slip ring induction motor is one of the types of 3 phase induction motor and is a wound rotor motor type. Instead of bars in this motor three windings are used. 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.

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Because of various advantages like low initial current high starting torque and improved power factor it is used in applications that require high torque cranes and elevators.

Slip ring induction motor rotor connection.

This construction of the rotor is aimed at reducing the phase difference. Adjusting the resistance allows control of the speed torque characteristic of the motor. It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding. The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor.

The three terminals of star connected rotor windings are brought out and are connected to the external resistors through the slip ring. The working principles and stator construction of the slip ring induction motor are exactly the same as that of the squirrel cage motor. The major difference between squirrel cage rotor and wound type rotor is the presence of a slip ring in wound type rotor hence it is also called a slip ring rotor. The rotor is wound for the same number of poles as that of the stator.

However the rotor construction of the slip ring motor is quite interesting.

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