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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