Impact of a bearingless machine on a shaft's rotodynamics: control of a single winding bearingless machine

Schneider, Nicolas (2020) Impact of a bearingless machine on a shaft's rotodynamics: control of a single winding bearingless machine. PhD thesis, University of Nottingham.

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Abstract

The aerospace industry is investigating more electrical aircraft since the early 90's. This electrification process in the aerospace industry look at replacing more and more hydraulic and mechanical actuator into electric and electromagnetic ones. The surge in electrical components in the aircraft leads to an increase in electric power consumption. For this reason there is a growing interest into the design of generator for aero-engines. Generator for turbofan are usually attached via a gear box to the high pressure shaft of the turbine. But in the last 20 years, several studies have tried to use electrical generators directly in-line with the turbine's shaft. This raised some challenges in terms of electrical machine performance, heat management as well as finding the good typologies to use for such a task.

In order to reduce even further the use of mechanical components in the aero-engine one could use an in-line electrical machine as an actuator for the starting of the turbine. However In this study will look in a different way to use an electrical generator. In addition to generate electrical power it will be able to work as actuator to reducing the impact of the vibration on the shaft. For this task the machine will be using one single winding to perform both functions.

A model of the bearingless machine will be set as well as the expressions giving the forces and the torque generated by the bearingless machine. A control system will be set up for that machine based and the model previously found. Furthermore the possibility to reduce the vibration of the shaft using the force generated by the bearingless machine will be investigated.

Looking not only at the reduction of the vibration but also the possibility of avoiding critical speeds of the shaft. Different strategies to fulfill that objectives will be proposed. Those strategies will be tested on a common test bench build in collaboration with 3 other PhD students.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Gerada, Chris
Qinfen, Lu
Keywords: Rotors, Dynamics; Winding machines; Actuators
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ170 Mechanics applied to machinery. Dynamics
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Faculties/Schools: UK Campuses > Faculty of Engineering
Item ID: 59569
Depositing User: Schneider, Nicolas
Date Deposited: 31 Jul 2020 04:40
Last Modified: 31 Jul 2020 04:40
URI: http://eprints.nottingham.ac.uk/id/eprint/59569

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