Which statement describes the difference between squirrel-cage rotor and wound-rotor rotor?

Which statement describes the difference between squirrel-cage rotor and wound-rotor rotor?

• A. Pole-phase Groups.
• B. How the Conductors Are Connected.
• C. How the Current Is Induced.
• D. All of the Above.

Answer: (B)

The key difference is how the rotor conductors are connected. In a squirrel-cage rotor, the conductors are embedded in the rotor and connected end-to-end by shorting rings, forming a closed, self-contained circuit with no external connections. In a wound rotor, the rotor windings are separate and connected to external circuitry via slip rings and brushes, allowing external resistance (or connections) to be inserted. This distinction is what controls how the rotor current paths are formed and how the rotor’s electrical characteristics can be altered, such as starting torque and speed control. The other factors aren’t the fundamental difference here: the stator’s pole-phase arrangement (pole-phase groups) isn’t what differentiates the rotor types, and the basic principle of inducing rotor current comes from the stator’s rotating magnetic field in both cases. Hence, how the conductors are connected best captures the distinction.

The key difference is how the rotor conductors are connected. In a squirrel-cage rotor, the conductors are embedded in the rotor and connected end-to-end by shorting rings, forming a closed, self-contained circuit with no external connections. In a wound rotor, the rotor windings are separate and connected to external circuitry via slip rings and brushes, allowing external resistance (or connections) to be inserted. This distinction is what controls how the rotor current paths are formed and how the rotor’s electrical characteristics can be altered, such as starting torque and speed control.

The other factors aren’t the fundamental difference here: the stator’s pole-phase arrangement (pole-phase groups) isn’t what differentiates the rotor types, and the basic principle of inducing rotor current comes from the stator’s rotating magnetic field in both cases. Hence, how the conductors are connected best captures the distinction.