This has to do with the windings on the rotor and the use of slip rings.
Slip ring rotor winding.
Bar straps or wires are used for winding.
Also rotor windings are connected through slip rings to external resistance.
Construction the construction of the slip ring motor is more complicated than the squirrel cage.
Instead of bars in this motor three windings are used.
For ease of understanding instead of the current 24 slots winding let s use a 12 slot winding.
A large number of rotor turns will increase the secondary voltages and reduce the current that flows through slip rings.
Rotor the rotor of a squirrel cage motor is a set of bars which are short circuited by end rings.
The disadvantages are high copper losses and the low torque.
A wound rotor motor uses three slip rings typically made of copper or a copper alloy mounted to but insulated from the motor shaft.
Each phase of winding is connected with the slip ring.
As for the slip ring motor the rotor has the same winding as the stator.
Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit.
What is a slip ring induction motor.
The slip ring brushes made of graphite are connected to a resistive device such as a rheostat.
A motor with a wound type rotor is known as a slip ring induction motor.
However the rotor construction of the slip ring motor is quite interesting.
Let s see how the slip ring rotor does it.
This construction of the rotor is aimed at reducing the phase difference.
Name one disadvantage of slip ring induction motor and squirrel cage induction motor.
As the motor accelerates.
A wound rotor motor also known as slip ring rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance.
These slip rings are insulated from the rotor shaft.