A double squirrel-cage induction motor has two parallel winding in Rotor.
A double squirrel-cage induction motor, also known as a dual-cage or two-cage motor, has two sets of rotor windings that are connected in parallel.
Each winding set consists of rotor bars and end rings, just like a regular squirrel-cage motor, but the two sets have different numbers of rotor bars and different bar shapes.
The inner winding set, or the "starting" cage, typically has a higher resistance and a lower reactance than the outer winding set, or the "running" cage.
The starting cage is designed to provide high starting torque and to help the motor accelerate quickly from rest, while the running cage is designed to provide high running efficiency and to operate at a lower slip.