In the squirrel-cage Induction motor, the rotor winding
consists of a series of bars of aluminum accommodated in the
rotor-core slots, all bars being completely short-circuited at
each end by a conducting ring. The starting and running
characteristics of the motor are fixed by the design of the rotor
winding. Because it is the simplest, cheapest and most robust
types of motor, it is suitable for most drive requirements. Its
rotor construction is without any slip-rings, commutator or
brushes requiring no maintenance.