The difference between the squirrel-cage rotor and the wound rotor is in

The difference between the squirrel-cage rotor and the wound rotor is in

• A. Their pole-phase groups.
• B. How the conductors are connected.
• C. How the current is induced in the conductors.
• D. All of the above.

Answer: (B)

The main distinction between these two rotor types lies in how the rotor windings are connected. In a squirrel-cage rotor, the conductors are bars embedded in the rotor iron and are shorted together by end rings, forming a closed, self-contained circuit with no external connections. In a wound rotor, the rotor windings are distributed in the slots and connected to external circuitry through slip rings, allowing current to be supplied or controlled from outside the rotor (often with resistors for speed control). The current in the rotor is induced by the stator’s rotating magnetic field in both designs, but the path the current takes and how it can be controlled differ because of the external connections in the wound rotor versus the closed, internal connections in the squirrel-cage rotor. The number of poles or the grouping of poles is determined by the stator, not by the rotor type, so that aspect isn’t what differentiates the two. Therefore, the key difference is how the conductors are connected.

The main distinction between these two rotor types lies in how the rotor windings are connected. In a squirrel-cage rotor, the conductors are bars embedded in the rotor iron and are shorted together by end rings, forming a closed, self-contained circuit with no external connections. In a wound rotor, the rotor windings are distributed in the slots and connected to external circuitry through slip rings, allowing current to be supplied or controlled from outside the rotor (often with resistors for speed control).

The current in the rotor is induced by the stator’s rotating magnetic field in both designs, but the path the current takes and how it can be controlled differ because of the external connections in the wound rotor versus the closed, internal connections in the squirrel-cage rotor. The number of poles or the grouping of poles is determined by the stator, not by the rotor type, so that aspect isn’t what differentiates the two. Therefore, the key difference is how the conductors are connected.