squirrel-cage rotor winding

machine part

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Last updated

July 14, 2026

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The term "squirrel-cage rotor winding" refers to a specific type of rotor construction used in induction motors. This design features conductors embedded in slots around the rotor's surface, which are then connected at each end by a conducting ring, resembling a squirrel cage.1

This construction is favored for its ruggedness and cost-effectiveness compared to other rotor winding types. The conductors are typically made of aluminum or copper bars, often cast as a single unit with the end rings and a fan for cooling in smaller motors. For larger machines, these components are welded or brazed together. The shape of the rotor slots can be modified to achieve different torque-speed characteristics for the motor.1

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electric motor
Construction of induction motors
…rotor winding is of the squirrel-cage type where solid conductors in the slots are shorted together at each end of the rotor iron by conducting end rings. In such machines there is no need to insulate the conductors from the iron. For motors up to about 300 kilowatts, the squirrel…
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…rotor winding is of the squirrel-cage type where solid conductors in the slots are shorted together at each end of the rotor iron by conducting end rings. In such machines there is no need to insulate the conductors from the iron. For motors up to about 300 kilowatts, the squirrel…
Read More