Reduction of unbalanced magnetic pull in doubly-fed induction machine

Aamir, Obaid

Reduction of unbalanced magnetic pull in doubly-fed induction machine

Aamir, Obaid

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Publication Type:: Thesis
Issue Date:: 2016

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Field	Value	Language
dc.contributor.author	Aamir, Obaid
dc.date.accessioned	2016-03-28T23:40:06Z
dc.date.available	2016-03-28T23:40:06Z
dc.date.issued	2016
dc.identifier.uri	http://hdl.handle.net/10453/43401
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_AU
dc.description.abstract	This thesis reports on an investigation into the unbalanced magnetic pull (UMP) in a wound rotor induction machine due to static rotor eccentricity. Wound rotor induction machines are commonly used in wind turbines as doubly-fed induction generators (DFIGs). It is important to maintain them in good working order and operational. There can be substantial bearing wear in these machines due to their almost continuous operation, and it is important to maintain low bearing wear of these machines in order to maintain good operation. These machines can have high maintenance costs since they are located in remote locations and in the nacelle of the wind turbine. When the rotor becomes eccentric (non-centred) bearing wear is increased and the maintenance requirement increases. It has been illustrated that the UMP is higher per unit in a wound rotor induction machine compared to the cage induction machine equivalent. In this study, a new measurement rig is developed in order to measure UMP. The methods for calculating UMP and splitting UMP and torque forces are addressed in this thesis. Furthermore, a new method for minimizing UMP is also introduced by using damper windings. Different tests and calculations are presented in this thesis. The understanding of the radial forces involved in producing UMP in a wound rotor induction machine is addressed. There is little literature on UMP in a wound rotor induction machine.	en_AU
dc.format	Thesis (MEng)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/43401/2/02whole.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.title	Reduction of unbalanced magnetic pull in doubly-fed induction machine	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

This thesis reports on an investigation into the unbalanced magnetic pull (UMP) in a wound rotor induction machine due to static rotor eccentricity. Wound rotor induction machines are commonly used in wind turbines as doubly-fed induction generators (DFIGs). It is important to maintain them in good working order and operational. There can be substantial bearing wear in these machines due to their almost continuous operation, and it is important to maintain low bearing wear of these machines in order to maintain good operation. These machines can have high maintenance costs since they are located in remote locations and in the nacelle of the wind turbine. When the rotor becomes eccentric (non-centred) bearing wear is increased and the maintenance requirement increases. It has been illustrated that the UMP is higher per unit in a wound rotor induction machine compared to the cage induction machine equivalent. In this study, a new measurement rig is developed in order to measure UMP. The methods for calculating UMP and splitting UMP and torque forces are addressed in this thesis. Furthermore, a new method for minimizing UMP is also introduced by using damper windings. Different tests and calculations are presented in this thesis. The understanding of the radial forces involved in producing UMP in a wound rotor induction machine is addressed. There is little literature on UMP in a wound rotor induction machine.

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