Other university all, Electrical Engineering , Electrical Machines – II Syllabus

Electrical Machines – II

Module 1: Fundamentals of AC machine windings 
Physical arrangement of windings in stator and cylindrical rotor; slots for windings; single-turn coil –
active portion and overhang; full- pitch coils, concentrated winding, distributed winding, winding axis,
3D visualization of the above winding types, Air-gap MMF distribution with fixed current through
winding- concentrated and distributed, Sinusoidally distributed winding, winding distribution factor
Module 2: Pulsating and revolving magnetic fields 
Constant magnetic field, pulsating magnetic field - alternating current in windings with spatial
displacement, Magnetic field produced by a single winding - fixed current and alternating current
Pulsating fields produced by spatially displaced windings, Windings spatially shifted by 90 degrees,

Additionofpulsatingmagneticfields,Threewindingsspatiallyshiftedby120degrees(carryingthree-
phase balanced currents), revolving magnetic field.

Module 3: Induction Machines 
Construction, Types (squirrel cage and slip-ring), Torque Slip Characteristics, Starting and Maximum

Torque. Equivalent circuit. Phasor Diagram, Losses and Efficiency. Blocked rotor test, No- Load test,
Determination of Parameters and power flow diagram. Effect of parameter variation on torque
speed characteristics (variation of rotor and stator resistances, stator voltage, frequency). Methods
of starting, braking and speed control for induction motors. Generator operation. Self-excitation.
Doubly-Fed Induction Machines.
Module 4: Single-phase induction motors 
Constructional features, double revolving field theory, equivalent circuit, determination of
parameters.
Split-phase starting methods and applications. Methods of starting using auxiliary winding,
development of equivalent circuit. No-Load and Blocked Rotor tests.
Module 5: Special Machines 
Basics of Hysteresis motor, Switched Reluctance motor, Stepper motor, Brushless DC motor
Constructional features, cylindrical rotor synchronous machine - generated EMF, equivalent circuit
and phasor diagram, armature reaction, synchronous impedance, voltage regulation. Operating
characteristics of synchronous machines, V-curves. Salient pole machine – two reaction theory,
analysis of phasor diagram, power angle characteristics. Parallel operation of alternators -
synchronization and load division.