Electrical Machines – I (3140913) Syllabus :
Syllabus
1 Magnetic fields and magnetic circuits
Review of magnetic circuits - MMF, flux, reluctance, inductance; Visualization of
magnetic fields produced by a bar magnet and a current carrying coil - through air and
through a combination of iron and air. Review of Ampere’s law and Biot Savart law.
2 Principles of Electromechanical Energy Conversion
B-H curve of magnetic materials; flux-linkage vs current characteristic of magnetic
circuits; linear and nonlinear magnetic circuits; energy stored in the magnetic circuit; force
as a partial derivative of stored energy with respect to position of a moving element; torque
as a partial derivative of stored energy with respect to angular position of a rotating
element.
3 DC Machines
Review of construction and working of a DC machine, visualization of magnetic field
produced by the field winding excitation with armature winding open, air gap flux density
distribution, flux per pole, induced EMF in an armature coil. Armature winding and
commutation – Elementary armature coil and commutator, lap and wave windings,
construction of commutator, Commutation, Derivation of back EMF equation, armature
MMF wave, derivation of torque equation, armature reaction, air gap flux density
distribution with armature reaction.
Armature circuit equation for motoring and generation, Types of field excitations –
separately excited, shunt and series. Open circuit characteristic of separately excited DC
generator, voltage build-up in a shunt generator, critical field resistance and critical speed.V-I characteristics and torque-speed characteristics of separately excited, shunt and series
motors. Speed control methods. Losses and Efficiency in DC machines. Swinburn’s test,
Hopkinson’s test, Field test, Retardation test, Separation of losses of a DC shunt machine
4 Transformers
Review of construction and working principle of single-phase and three-phase
transformers, equivalent circuit, phasor diagram, voltage regulation, losses and efficiency.
Testing - open circuit and short circuit tests, polarity test, back-to-back test, separation of
hysteresis and eddy current losses
Three-phase transformer - construction, types of connection and their comparative
features, Vector groups, Parallel operation of single-phase and three-phase transformers,
Autotransformers - construction, principle, applications and comparison with two winding
transformer, Magnetizing current, effect of nonlinear B-H curve of magnetic core material,
harmonics in magnetization current, Phase conversion - Scott connection, three-phase to
six-phase conversion, Tap-changing transformers - No-load and on-load tap-changing of
transformers, Three-winding transformers. Cooling of transformers.
| Syllabus | Download |
|---|---|
| Electrical Machine 1 | Click Here |
Electrical Machines – I - IMP Question :
| Units | Download |
|---|---|
| Electrical Machines – I IMP Question | Click Here |
Electrical Machines – I Old Papers :
| Year(Winter/Summer) | Question Paper |
|---|---|
| Winter 2020 | Click Here |
| Winter 2021 | Click Here |
| Summer 2020 | Click Here |
| Summer 2021 | Click Here |
Electrical Machines – I Books :
| Books | Download |
|---|---|
| Electrical Machines-I By JBIET | Click Here |
| Electrical Machines-I By MRCET | Click Here |
| Electrical Machines-I By U.A.Bakshi,V.U.Bakshi | Click Here |
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