Advanced Electrical Machines

Module code: EG7034

Topics covered

  • Introduction Definition of machine and drive. Revision of mechanical principles. Mechanical loads and their characteristics.
  • The basics of electromagnetic torque production for singly and doubly excited systems.
  • Application of matrix methods to electrical networks, Voltage equation, Impedance matrix, Linear transformations in electric circuit analysis.
  • Choice of transformation - Invariance of power, symmetrical components. Application to single phase transformer.
  • The primitive machine. Frames of reference and sign conventions. Voltage equation. Impedance matrix, transformer and rotational emfs. Impedance matrix decomposition.
  • Linear transformations, 3-phase to 2-phase, 2-phase to stationary axes, Brush shift.
  • The form of the transient impedance matrix, Fundamental torque equations.
  • Summary. Overview of Machine Analysis.
  • Application to DC and other commutator machines, separately excited, compound and series connections.
  • Inter-connected DC machines. Motor and generator, metadyne transformer.
  • Analysis of two pole synchronous machine with salient poles. Reduction to primitive machine, impedance and torque equations. Excitation and reluctance torque.
  • Poly-phase induction machines. Reduction to primitive machine, impedance and torque equations. Reading Assignment 2.
  • State-space model and simulation of induction motor performance. Start-up dynamics, load application, terminal short circuit.
  • Incorporation of saturation, slip dependence of rotor parameters, eddy current loss, phase sequence reversal and incorporation of mechanical system models.
  • Brushless DC motors, operation, construction, design and analysis. Back-emf and torque characteristics. Radial and axial flux machines. Brushless permanent magnet generators.
  • Switched Reluctance Motors, operation, design, construction, analysis. Stator and rotor pole numbers and relationship to number of phase windings. Power electronic control.

Learning

  • 22 hours of lectures
  • 128 hours of guided independent study

Assessment

  •  Exam, three hours (100%)