Difference Between Squirrel Cage And Wound Rotor Induction Motor Pdf

A wound rotor induction motor has a stator like the squirrel cage induction motor, but a rotor with insulated windings brought out via slip rings and brushes. However, no power is applied to the slip rings. Their sole purpose is to allow resistance to be placed in series with the rotor windings while starting.

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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. Carbon brushes, slip rings etc are provided in the rotor circuit. Higher efficiency. Comparatively less efficiency. Low starting torque. It is 1.5 time full load torque.

High starting torque. It can be obtained by adding external resistance in the rotor circuit.

Speed control by rotor resistance is not possible. Speed control by rotor resistance is possible. Starting current is 5 to 7 times the full load. Less starting current. Advantages of Squirrel-Cage Induction Motors The advantages of squirrel-cage motors compared with the slip ring induction motors are given below (i) They are more robust and cheaper (ii) Comparatively they have higher efficiency and power factor (iii) Since the risk of sparking is eliminated by the absence of slip rings and brushes, they are explosion-proof. Advantages of Slip ring Induction Motors The advantages of the wound rotor (Slip ring) Induction motors compared with the squirrel-cage motors are given below (i) They have very high starting torque (ii) They have very low starting current (iii) They have a means of varying speed by use of external rotor resistance. Dark souls prepare to die edition product key generator download for pc.

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