An induction motor or 3 phase induction motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding

An induction motor which connects with a 3-phase supply called 3-phase induction motor. Example fans,blowers, cranes,traction .It is a ac motor. The main drawback of DC motors is the presence of commutator and brushes, which require frequent maintenance and we can't use DC motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require less maintenance and can use in dirty and explosive environment. Slip s is the imp factor in this type of motor.