## Asynchronous MachinesBasic Concepts Field distribution of space distributed three-phase winding, Concept of rotating field, Production and concept of asynchronous and synchronous torques.Polyphase Induction Machines Constructional features, Operation, Equivalent circuit, Phasor diagram , Leakage reactance and it s importance on machine performance, Effect of rotor circuit resistance, Starting torque, Cage motors, Double cage and deep bar motor.Generator action, Methods of excitation, Space harmonics and their effect on motor performance, Starting methods, Speed control : (i) Control of speed of rotating field, (ii) Control of slip speed. Estimation of equivalent circuit parameters.Effect of voltage injection in rotor circuit of slip ring induction motor, Action of commutator, Scherbius and Kramer schemes of speed and P.F. control of induction motors. Stepper Motors and Linear Induction Machines Stepper Motors : Construction, Principle of operation and applications.Linear Induction Machines : Construction, Principle of operation and applications. Single Phase Motors Single phase induction motor, Double revolving field theory, Equivalent circuit, Characteristics. Phase splitting, Shaded pole motor, Single phase series and repulsion motor : Working and characteristics. |

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### Contents

Chapter2 Polyphase Induction Machines 21 to 2 132 | 2-1 |

Chapter3 Starting and Speed Control of Induction Motor 3 1 to 3 | 2-133 |

Chapter5 Single Phase Motors 5 1 to 5 | 5-1 |

### Common terms and phrases

air gap armature Asynchronous Machines autotransformer brushes called capacitor centrifugal switch coil constant Control of Induction core loss d.c. motor delta connected direction electrical equivalent circuit excited external resistance field winding full load slip full load torque hence impedance input Key Point m.m.f. wave magnetic axis maximum torque mechanical losses number of poles phase induction motor phasor diagram Pout power factor ratio reactance referred to stator repulsion motor resistance per phase rotating magnetic field rotor circuit rotor copper loss rotor current rotor induced e.m.f. rotor machine rotor resistance running condition short circuited shown single phase induction sinusoidal slip ring slots Solution split phase Squirrel cage rotor star connected starting current starting torque stator and rotor Stator losses Stator resistance stator winding stepper motor synchronous speed TF.l three phase induction three phase winding torque produced torque-slip characteristics voltage