Constructional details-Three-phase armature winding:-integral- and fractional-; MMF distribution; distribution factor; EMF generation; chording; EMF induced and elimination of harmonics; pitch factor; Rotating magnetic field; Concept of time and space harmonics; Concept of forward and reverse rotating magnetic field; Effect of slotting-elimination of slot harmonics-skewing; Cogging and crawling; Principle of operation of induction machines; Equivalent circuit; phasor diagram; power intake, air-gap power and torque; Maximum torque and the slip at maximum torque; Ratio of V/f and maximum torque; Complete torque slip characteristics; Free running or no-load test; Separation of friction and windage loss; Locked rotor test- skin effect; Circle diagram; Use of circle diagram; Starting of three-phase induction motor; Speed control and braking; Cascade connection; injection of EMF in rotor circuit; Kramer’s and Scherbius cascade; Induction generator Self- and grid- excited; Georges’s phenomenon; Deep bar and double cage rotor; Single-phase induction motor-equivalent circuit and starting.