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Unit - 1 Magnetic Fields And Magnetic Circuits

Unit 1

Magnetic fields and magnetic circuits

1.1 Review of magnetic circuits MMF Flux Reluctance Inductance

1.2 Review of Ampere Law and BiotSavart Law

1.3 Visualization of magnetic fields produced by a bar magnet and a current carrying coil through air and through a combination of iron and air

1.4 Influence of highly permeable materials on the magnetic flux lines.

Unit - 2 Electromagnetic Force And Torque

Unit 2

Electromagnetic force and torque

2.1 BH curve of magnetic materials fluxlinkage vs current characteristic of magnetic circuits

2.2 energy stored in the magnetic circuit

2.3 force as a partial derivative of stored energy with respect to position of a moving element

2.4 torque as a partial derivative of stored energy with respect to angular position of a rotating element

2.5 Examples galvanometer coil relay contact lifting magnet rotating element with eccentricity or saliency

Unit - 3 DC Machines

Unit – 4

DC MACHINES

4.1 Basic construction of a DC machine magnetic structure stator yoke stator poles polefaces or shoes air gap and armature core

4.2 visualization of magnetic field produced by the field winding excitation with armature winding open

4.3 air gap flux density distribution flux per pole induced EMF in an armature coil

4.4 Armature winding and commutation

4.5 Lap and wave winding

4.6 Construction of commutatorLinear commutation

4.7 Derivation of back emf

4.8 Derivation of Torque equation

4.9 Armature reaction

4.10 Air gap flux density distribution with armature reaction

Unit - 4 DC Machine - Motoring And Generation

Unit 5

DC machine motoring and generation

5.1 Armature circuit equation for motoring and generation

5.2 Types of field excitation Separately excited shunt and series.

5.3 open circuit characteristics of separately excited DC generator

5.4 back EMF with armature reaction voltage buildup in a shunt generator

5.5 Critical field resistance and critical speed

5.6 V I characteristics and torquespeed characteristics of separately excited shunt and series motors

5.7 Speed control through armature voltage

5.8 Losses

5.9 Load testing and back to back testing of DC machine

Unit - 5 Transformers

Transformers

Unit 3

Transformers

3.1 Principle

3.2 Construction and operation of singlephase transformer

Unit 3

Transformers

3.1 Principle

3.2 Construction and operation of singlephase transformer

3.3 Equivalent circuit and phasor diagram voltage regulation

3.4 losses and efficiency

3.5 testingOC and SC Test

3.6 Separation of hysteresis and eddy current loss

3.7 Three phase transformer

3.8 Types of connection and comparative features

3.9 Parallel operation of single phase and three phase transformer

3.10 Autotransformerconstruction principle application

3.11 comparison with two winding transformer

3.12 Magnetizing current effect of nonlinear BH curve of magnetic core material

3.13 harmonics in magnetization current

3.14 Phase conversion Scott connection threephase to sixphase conversion

3.15 Tapchanging transformers Noload and onload tapchanging of transformers

3.16 Threewinding transformers

3.17 cooling of transformers

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