EE8401 – NOTES & QP
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EE8401 – SYLLABUS
UNIT I SYNCHRONOUS GENERATOR
Constructional details — Types of rotors –winding factors- emf equation — Synchronous reactance — Armature reaction — Phasor diagrams of non salient pole synchronous generator connected to infinite bus–Synchronizing and parallel operation — Synchronizing torque -Change of excitation and mechanical input- Voltage regulation — EMF, MMF, ZPF and A.S.A methods — steady state power- angle characteristics– Two reaction theory –slip test -short circuit transients — Capability Curves
UNIT II SYNCHRONOUS MOTOR
Principle of operation — Torque equation — Operation on infinite bus bars — V and Inverted V curves — Power input and power developed equations — Starting methods — Current loci for constant power input, constant excitation and constant power developed-Hunting — natural frequency of oscillations — damper windings- synchronous condenser.
UNIT III THREE PHASE INDUCTION MOTOR
Constructional details — Types of rotors — Principle of operation — Slip –cogging and crawling- Equivalent circuit — Torque-Slip characteristics — Condition for maximum torque — Losses and efficiency — Load test — No load and blocked rotor tests — Circle diagram — Separation of losses — Double cage induction motors –Induction generators — Synchronous induction motor.
UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION
Need for starting — Types of starters — DOL, Rotor resistance, Autotransformer and Stardelta starters — Speed control — Voltage control, Frequency control and pole changing — Cascaded connection-V/f control — Slip power recovery scheme-Braking of three phase induction motor: Plugging, dynamic braking and regenerative braking.
UNIT V SINGLE PHASE INDUCTION MOTORS AND SPECIAL MACHINES
Constructional details of single phase induction motor — Double field revolving theory and operation — Equivalent circuit — No load and blocked rotor test — Performance analysis — Starting methods of single-phase induction motors — Capacitor-start capacitor run Induction motor- Shaded pole induction motor — Linear induction motor — Repulsion motor — Hysteresis motor — AC series motor- Servo motors- Stepper motors — introduction to magnetic levitation systems.