UNIT 1:
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
- steady state power angle characteristics– Two reaction theory
slip test -short circuit transients - Capability Curves
slip test -short circuit transients - Capability Curves
UNIT 2:
Principle of operation – Torque Equation
Principle of operation – Torque Equation
operation on infinite busbars
Power input and power developed equations
Hunting – natural frequency of oscillations
Current loci for constant power input, constant excitation and constant power developed
UNIT 3:
Constructional details – Types of rotors
Principle of operation – Slip –cogging and crawling
Torque-Slip characteristics - Condition for maximum torque
Load test - No load and blocked rotor tests
Circle diagram – Separation of losses
Double cage induction motors –Induction generators
Synchronous induction motor
UNIT 4:
Need for starting – Types of starters – DOL
Rotor resistance, Autotransformer
Speed control – Voltage control, Frequency control
Pole changing – Cascaded connection
Slip power recovery scheme
Braking of three phase induction motor: Plugging
Dynamic braking and regenerative braking
UNIT 5:
Constructional details of single phase induction motor
Double field revolving theory and operation
Starting methods of single-phase induction motors – Capacitor-start capacitor run Induction motor- Shaded pole induction motor
Hysteresis motor - AC series motor
No load and blocked rotor test – Performance analysis
Linear induction motor – Repulsion motor
Servo motors- Stepper motors
introduction to magnetic levitation systems
