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Simple Method to Calculate the Force between Thin Walled Solenoids
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.
2016 (English)In: Progress In Electromagnetics Research M, ISSN 1937-8726, Vol. 51, p. 93-100Article in journal (Refereed) Published
Abstract [en]

We developed a simple method to calculate the axial force between concentric thin walled solenoids. To achieve this, the force between them was mapped as a function of their geometrical relations based on separation-to-diameter ratios. This resulted in an equation and a set of data. We used them together to calculate axial forces between two coaxial thin walled solenoids. With this method, direct evaluation of elliptical integrals was circumvented, and the forces were obtained with a simple expression. The results were validated against solutions obtained with an existing semi-analytical method and force measurements between high coercivity permanent magnets.

Place, publisher, year, edition, pages
EMW Publishing , 2016. Vol. 51, p. 93-100
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-328077DOI: 10.2528/PIERM16062307ISI: 000410508000009OAI: oai:DiVA.org:uu-328077DiVA, id: diva2:1133819
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy StorageStandUpAvailable from: 2017-08-16 Created: 2017-08-16 Last updated: 2017-12-15
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)
Opponent
Supervisors
Available from: 2017-09-13 Created: 2017-08-16 Last updated: 2017-10-17

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Lundin, Urban

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