Multiphase Synchronous Generators for DC Aircraft Power Systems

  • Steven Jordan

Student thesis: Phd


More-electric aircraft have been the focus of considerable development in recent years. Increased utilisation of electrical systems on-board the latest generation of aircraft has seen an increase in fuel efficiency, through improved electrical derivation from the gas turbine engine and weight savings from the replacement of mechanical and hydraulic transmission systems. The advancement of power electronic and DC breaker devices has led to the reconsideration of DC power distribution systems for standalone networks. Aircraft can benefit from this through the reduced transmission losses, improved controllability and intelligent networking.Through the use of a multiphase synchronous generator, connected to a diode rectifier, a standalone DC network capable of providing power with redundancy can be produced. The aim of this research project is to investigate the effects that phase number, connection topology and winding pitch have on the behaviour of an AC generator connected to a passive diode rectifier. This thesis develops the methodology for determining the number of phases and the topology of the generator. Static and dynamic modelling is conducted through the use of computer finite element modelling and circuit simulation. The dynamic circuit simulation model is configured using parameters obtained from experimental data. The experimental test-rig, which is constructed to be reconfigurable in phase number, connection topology and winding pitch, is used to validate the simulation and provide detailed results on the steady-state operation of the generator-rectifier system. Open-circuit faults are introduced to assess the fault tolerance of the system and the effects of the inherent phase redundancy on the generator performance.
Date of Award31 Dec 2013
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorJudith Apsley (Supervisor)


  • Synchronous Generators
  • Multiphase

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