AC Machines
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AC Machines Syllabus — Unit-wise Content
The official GTU curriculum for AC Machines (subject code 2140906) as prescribed for PE · Semester 4 divides the course into 6 units, covering 72 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (2140906)Unit 1 Poly-phase Induction Motor
- Types of motor
- Working principle
- Rotating magnetic field
- Operating parameters at different load
- No-load & blocked rotor test
- Equivalent circuit
- Phasor diagram
- Circle diagram
- Efficiency and slip scale with the help of circle diagram
- Effect of rotor resistance on performance of motor
- Double cage motor and its equivalent circuit
- Introduction to machine dynamics
- Starters of poly-phase induction motor including soft starter
- Methods of speed control of 3- phase motor
- Schematic diagram and advantages of Variable Voltage Variable Frequency drive
- Electrical transients in induction machine
- Magnetic levitation : Principle
- advantages and application of linear induction motor
- Effect of harmonics
- Harmonic torques
- Cogging & Crawling
- Effect of unbalanced voltages on performance of motor
- Performance of motor with variable voltage and frequency
- Testing of induction motor as per IS, Energy efficient motors
Unit 2 Induction Generator,
- Principle of operation and application
- Its load and p. f. control
Unit 3 Single phase A. C. motors
- Double field revolving theory
- Starting & running performance of 1- phase induction Motor
- Equivalent circuit of 1phase induction motor
- Types of single phase motors
- Principle and operation of split phase
- Resistance start
- Capacitor start and capacitor start & run induction motor
- Shaded pole induction motor
- Fractional horse power motors
Unit 4 Synchronous Machines
- Working principle
- Equation of induced emf with and without harmonics in MMF, pitch factor and distribution factor
- MMF of distributed windings
- Torque equation
- Machine efficiency
- Armature reaction and its compensation
- Short circuit ratio
- Effect of change in excitation
- Effect of change in torque and speed
- Voltage regulation
- Determination of voltage regulation by Synchronous impedance method
- MMF method
- ZPF method and AIEE method
- Synchronization : Importance and Methods of synchronization
- Operating characteristic
- Load angle and Power flow equations
- Capability curves
- Two reaction model of Salient pole machines
- Parallel operation
- Load sharing between parallel connected generators
- Effect of unequal voltages & unequal percentage impedance
- Governor characteristics
- Introduction to single phase generators
- Slip test for measurement of direct axis and quadrature axis reactance for salient pole machine
- Sudden short circuit of Synchronous machine
- Hunting of synchronous machines and its prevention
Unit 5 Synchronous Motor
- Methods of starting of synchronous motors
- Different torques in Synchronous motor
- Synchronous condenser
- Synchronous phase modifiers
- V-curves and O-curves of Synchronous motors
- Auto Synchronous Motor: Construction
- principle of operation
- equivalent excitation current for various rotor connections
- circle diagram
Unit 6 Commutator motors
- Construction and working principle of Schrage motor
- Universal motor and Repulsion motor
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