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Electromagnetic losses in synchronous machines during active compensation of unbalanced magnetic pull
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.ORCID iD: 0000-0003-4265-6545
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2018 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 66, no 1, p. 124-131Article in journal (Refereed) Published
Abstract [en]

Unbalanced magnetic pull (UMP) is typically caused by rotor or stator shape defects, electrical short circuits, eccentric rotor/stator bores, as well as unreasonable pole-slot combinations. It leads to vibration and increases noise and energy losses of the machine. By actively controlling the magnetic fields and forces that arise between the rotor and stator by regulating the rotor field current of separated pole groups, it is possible to cancel it. In this paper, we measure and calculate the currents induced in the damper bars for a synchronous machine test rig under 20% static eccentricity with and without active compensation of UMP. This is done to validate our finite-element calculations. Afterward, we perform loss calculations for a 74-MVA synchronous generator with and without stator parallel circuits. We find that, with active compensation of UMP for an eccentric machine, the damper bar currents and stator parallel circuit circulating currents can be eliminated and the electromagnetic efficiency of the machine that has a static eccentricity fault increases.

Place, publisher, year, edition, pages
2018. Vol. 66, no 1, p. 124-131
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-328080DOI: 10.1109/TIE.2018.2827991ISI: 000443894700012OAI: oai:DiVA.org:uu-328080DiVA, id: diva2:1133822
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Title in dissertation reference list: Electromagnetic losses in synchronous machines during active compensation of unbalanced magnetic pull due to static eccentricity

Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2018-11-13Bibliographically approved
In thesis
1. Analysis and control of magnetic forces in synchronous machines
Open this publication in new window or tab >>Analysis and control of magnetic forces in synchronous machines
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In a synchronous machine, radial, tangential, and axial forces are generated. In this thesis, three different technologies to control them are proposed. The first one, involves the utilization of the radial forces that arise between the rotor and the stator. This is achieved by segmenting the rotor field winding into groups of poles and controlling their corresponding magnetization individually. This technology is particularly useful to achieve magnetic balance and to create controllable radial forces. The second technology, involves the control of the rotor field in order to influence the tangential forces that produce torque. This is achieved by inverting the rotor field winding polarity with respect to the stator field. With this technique, breaking and accelerating torques can be created. It is particularly useful to start a synchronous machine. Finally, the application of axial forces with a magnetic thrust bearing is discussed. The main benefits of this technology are higher efficiency and increased reliability.

The work presented in this thesis was carried out within the Division of Electricity in the Department of Engineering Sciences at Uppsala University. It is based on original research supported by analytical calculations, computational simulations and extensive experimental work.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 84
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1542
Keywords
eccentricity, electromagnetics, electromagnetic forces, excitation, magnetic fields, magnetic forces, magnetic thrust bearing, rotor drive, split rotor, starting, synchronous generators, synchronous machines, synchronous motors, unbalanced magnetic pull
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-328086 (URN)978-91-513-0036-8 (ISBN)
Public defence
2017-10-06, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
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Available from: 2017-09-13 Created: 2017-08-16 Last updated: 2017-10-17

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Pérez-Loya, Jesús JoséAbrahamsson, JohanLundin, Urban

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