syllabus for an Electrical Machines II

syllabus for an Electrical Machines II course:

Unit I: Synchronous Generators

  • Constructional Details: Types of rotors, winding factors
  • EMF Equation: Synchronous reactance, armature reaction
  • Phasor Diagrams: 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 ASA methods
  • Power-Angle Characteristics: Steady-state power, two-reaction theory, slip test, short circuit transients, capability curves

Unit II: Synchronous Motors

  • 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 Motors

  • Constructional Details: Types of rotors, principle of operation
  • Slip: Cogging and crawling, equivalent circuit
  • Torque-Slip Characteristics: Condition for maximum torque, losses and efficiency
  • Testing: Load test, no-load and blocked rotor tests, circle diagram, separation of losses
  • Special Types: Double cage induction motors, induction generators, synchronous induction motor

Unit IV: Starting and Speed Control of Three-Phase Induction Motors

  • Starting Methods: DOL, rotor resistance, autotransformer, and star-delta starters
  • Speed Control: Voltage control, frequency control, pole changing, cascaded connection, V/f control, slip power recovery scheme
  • Braking: Plugging, dynamic braking, regenerative braking

Unit V: Single-Phase Induction Motors and Special Machines

  • Constructional Details: Double field revolving theory, operation
  • Equivalent Circuit: No-load and blocked rotor test, performance analysis
  • Starting Methods: Capacitor-start, capacitor-run induction motor, shaded pole induction motor
  • Special Machines: Linear induction motor, repulsion motor, hysteresis motor, AC series motor, servo motors, stepper motors, introduction to magnetic levitation systems

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