ELIN Motors GmbH

Squirrel-Cage Rotor (Cage Rotor)

Squirrel-Cage Rotor (Cage Rotor)

The squirrel-cage rotor, also referred to as cage rotor, is the simplest form of an asynchronous machine. The rotor body consists of a stack of laminated iron sheets in which slots are punched into the circumference. In these slots, copper bars are inserted which on both ends are short-circuited with a copper ring. However, not only copper is used as a conductor material in a cage rotor. For very small machines, the entire cage is cast via centrifugal casting out of aluminium. Machines with unique starting requirements also demand materials with adapted conductivity such as bronze.