What is the difference between the construction of a squirrel cage rotor and a slip ring rotor in a 3ph motor?

The copper conductors in a squirrel-caged motors are just short-circuited in its ends while in a slip ring motor, the conductors are connected in series to a star point. The resistance in the latter are higher than that of the former motor. The windings are connected in series with an external resistance through carbon brushes to increase its resistance during start-up. The slip ring motors usually have higher starting torque and lower starting current than squirrel-caged motors.What is the difference between the construction of a squirrel cage rotor and a slip ring rotor in a 3ph motor?
The squirrel cage motor, as the description says, is like a squirrel cage. Thick aluminum bars formed into a cage.





The slip ring motor (correct term wound rotor motor) has poles formed of laminated iron that are wound with enamel coated wires. The wires are connected to the slip rings so that the connection can be made with brushes and resistances be added to the circuit for starting and/or speed control.