PROPERTY SQUIRREL CAGE MOTOR SLIP RING MOTOR Rotor Construction Bars are used in rotor. Squirrel cage motor is very simple, rugged and long lasting. No slip rings and brushes Winding wire is to be used. Wound rotor required attention. Slip ring and brushes are needed also need frequent maintenance.

Starting Can be started by D.O.L., star-delta, auto transformer starters Rotor resistance starter is required. Starting torque Low Very high Starting Current High Low Speed variation Not easy, but could be varied in large steps by pole changing or through smaller incremental steps through thyristors or by frequency variation. Easy to vary speed. Speed change is possible by inserting rotor resistance using thyristors or by using frequency variation injecting emf in the rotor circuit cascading. Maintenance Almost ZERO maintenance Requires frequent maintenance Cost Low High.

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Squirrel Cage Induction Motor vs Slip Ring Induction Motor Comparison of Squirrel cage induction motor with slip ring induction motor (Wound Rotor Induction Motor) is listed in the below table: Squirrel Cage Induction Motor Slip ring (wound rotor) Induction Motor In Squirrel cage induction motors the rotor is simplest and most rugged in construction In slip ring induction motors the rotor is wound type. In the motor the slip rings, brushes are provided. Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor with heavy bars or copper or aluminium or alloys are used for conductors.

Cylindrical laminated core rotor is wound for as the number of poles of the stator. Rotor conductors or rotor bars are short circuited with end rings. At starting the 3 phase windings are connected to a star connected rheostat and during running condition, the windings is short circuited at the slip rings. Rotor bars are permanently short circuited and hence it is not possible to connect external resistance in the circuit in series with the rotor conductors. It is possible to insert additional resistance in the rotor circuit. Therefore it is possible to increase the torque ( the additional series resistance is used for starting purposes) Cheaper cost Cost is slightly higher. No moving contacts in the rotor.

Wound-rotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit; as the motor accelerates, the resistance can be decreased. Squirrel Cage Motors have a heavy winding made up of solid bars, usually aluminum or copper, joined by rings at the ends of the rotor. Fb challenge accepted.