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The tunnel of the rotor in a single phase induction motor, known as the squirrel-cage rotor, is typically made of aluminum or copper. These materials are chosen for their excellent electrical conductivity, which allows for efficient induction of current by the magnetic field produced by the stator, leading to the creation of a rotating magnetic field that drives the rotor.
: a
Explanation: The rotor consists of a block of slotted laminations. The slots form a series
of tunnels that are filled with aluminium in its molten state