Electrical Machines-II (B.Tech)

Three-phase induction machines, synchronous machines and single-phase motors.

6 MonthsDuration 5Chapters31Topics

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Syllabus · पाठ्यक्रम

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01Unit 1: Three-Phase Induction Motor 7 topics

Construction: squirrel-cage and slip-ring
Rotating magnetic field
Slip and rotor frequency
Equivalent circuit
Torque equation and torque-slip characteristics
Maximum and starting torque
Power stages and efficiency

02Unit 2: Testing, Starting and Speed Control of Induction Motors 7 topics

No-load and blocked-rotor tests
Circle diagram
DOL, star-delta, auto-transformer and rotor-resistance starters
Speed control methods
Cogging and crawling
Double-cage rotor
Induction generator

03Unit 3: Synchronous Generator 6 topics

Construction: salient and cylindrical rotor
Pitch and distribution factors
EMF equation
Armature reaction and synchronous reactance
Voltage regulation: EMF, MMF and ZPF (Potier) methods
Two-reaction theory of salient-pole machines

04Unit 4: Synchronous Machine Operation and Synchronous Motor 6 topics

Synchronisation and parallel operation
Power-angle characteristics
Synchronous motor: starting methods
Effect of excitation, V and inverted-V curves
Synchronous condenser
Hunting and damper windings

05Unit 5: Single-Phase Motors 5 topics

Double revolving field theory
Equivalent circuit of single-phase induction motor
Split-phase, capacitor-start and capacitor-run motors
Shaded-pole motor
Universal (AC series) motor

About

You will be able to

Explain the rotating magnetic field and the equivalent circuit of a three-phase induction motor
Calculate slip, torque, power stages and efficiency of induction motors
Select starting and speed-control methods and use the circle diagram
Find the EMF and voltage regulation of alternators by EMF, MMF and ZPF methods
Explain synchronisation, parallel operation, V-curves and hunting of synchronous machines
Explain the working and types of single-phase induction motors

Who it is for

B.Tech Electrical Engineering students of Semester 5 under AKTU
Students preparing for AKTU sessional tests, the end-semester examination and GATE machines

What you need

Electrical Machines-I (transformers and DC machines)

Questions

Which syllabus is followed?

The current AKTU (Dr. A.P.J. Abdul Kalam Technical University, Lucknow) B.Tech syllabus of Electrical Machines-II (Electrical Engineering, Semester 5). If your university or college follows a different syllabus, the centre teaches from your own university syllabus.

How is the subject examined?

AKTU assesses it through sessional tests, assignments and attendance, and an end-semester university examination; the centre covers every unit with theory, derivations and numericals.

Are previous-year questions practised?

Yes. Unit-wise AKTU previous-year questions, short-answer questions and the test series are solved in class.