Squirrel Cage vs wound rotor or Slip Ring Induction Motor
The difference between slip ring wound and squirrel cage induction motors lies primarily in their construction and the way they function.

Construction:
Squirrel Cage Induction Motor: This type of motor has a rotor made of a cylindrical core with conductive bars (aluminum or copper) placed parallel to the motor's shaft. The bars are shorted at both ends by end rings, resembling a squirrel cage, hence the name.
Slip Ring (Wound Rotor) Induction Motor: In contrast, the slip ring motor has a rotor with insulated winding coils. The ends of these coils are connected to external terminals through slip rings and brushes, allowing external resistance to be added to the rotor circuit.

Starting and Speed Control:
Squirrel Cage Motor: These motors are simple and robust, commonly used in applications where constant speed is required. They start directly when connected to the power supply and have limited speed control options.
Slip Ring Motor: These motors offer better control over starting and speed. The external resistance connected to the slip rings can be varied to control the starting torque and speed of the motor, making them suitable for applications requiring variable speeds.

Applications:
Squirrel Cage Motor: They are widely used in applications such as fans, pumps, compressors, and conveyor systems, where constant speed operation is sufficient.
Slip Ring Motor: These motors are used in applications that require high starting torque or variable speed control, such as cranes, elevators, crushers, and mills.
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