Magneto-vibro-acoustic Computational Techniques for Electrical Machines

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School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2020-03-13
Degree programme
120 + app. 66
Aalto University publication series DOCTORAL DISSERTATIONS, 34/2020
This thesis investigates the electromagnetic, magnetomechanical and vibro-acoustic interactions in an electrical machine, and proposes numerical computational tools and experimental techniques for modeling these phenomena in electrical motors. In an electrical motor, the supplied electrical energy goes through different physical domains in the form of magnetic, mechanical, acoustic and thermal energy. In this thesis, computational methods for magnetic forces, magnetostriction, mechanical deformations, vibrations, and finally the acoustic sound produced by electrical motors are successfully implemented. The study starts with the analysis of magnetic forces in ferromagnetic materials and electrical motors by crafting finite element methods for computing these forces and validating them with experiments. From there, the investigations proceed to structural mechanics zone, where the effects of magnetic forces and magnetostriction on the deformations and vibrations of electrical steel sheets and the stator core of electrical motors are studied using numerical methods and experimental justifications. The causes of vibrations in two induction motors were examined with computational and experimental methodologies. The generation of acoustic noise due to mechanical vibrations is modeled using a numerical method that is based on a combination of the finite-element and boundary-element methods. The results and findings in the thesis from numerical and experimental studies provide efficient tools for analyzing and computing various quantities pertaining to the behavior of ferromagnetic materials and electrical motors. These methods can be applied in practical facets such as the design and condition-monitoring stages of electrical motors. This thesis has succeeded in addressing different domains of energy conversions and their effects in electrical machines by developing reliable and proficient computational tools and experimental methods in the realms of magnetics, mechanics and acoustics.
Supervising professor
Belahcen, Anouar, Prof., Aalto University, Department of Electrical Engineering and Automation, Finland
electrical machines, finite element analysis, magnetic forces, magnetostriction, vibrations, acoustics
Other note
  • [Publication 1]: Sabin Sathyan, Anouar Belahcen, Juhani Kataja, Francois Henrotte, Abdelkader Benabou, Yvonnick Le Menach. Computation of Magnetic Forces using Degenerated Air-gap Element. IEEE Transaction on Magnetics, 2017, Volume 53.
    DOI: 10.1109/TMAG.2017.2656239 View at publisher
  • [Publication 2]: Sabin Sathyan, Anouar Belahcen, Ugur Aydin, Juhani Kataja, Vesa Nieminen, Janne Keränen. Computational and Experimental Segregation of Deformations due to Magnetic Forces and Magnetostriction. In The 20th International Conference on Electrical Machines and Systems (ICEMS 2017), Sydney, Australia, August 2017.
    DOI: 10.1109/ICEMS.2017.8056279 View at publisher
  • [Publication 3]: Janne Keränen, Pavel Ponomarev, Sabin Sathyan, Juhani Kataja, Anouar Belahcen. Magneto-structural Simulation of an Induction Motor Start-up using Nodal Magnetic Forces in Elmer. Journal of Structural Mechanics, 2017, Volume 50, pp. 296-299.
    DOI: 10.23998/rm.64993 View at publisher
  • [Publication 4]: Sabin Sathyan, Ugur Aydin, Antti Lehikoinen, Anouar Belahcen, Toomas Vaimann, Juhani Kataja. Influence of Magnetic Forces and Magnetostriction on the Vibration behavior of an Induction Motor. International Journal of Applied Electromagnetics and Mechanics, 2018, Volume 59, pp. 825-834.
    Full text in Acris/Aaltodoc:
    DOI: 10.3233/JAE-171045 View at publisher
  • [Publication 5]: Sabin Sathyan, Antti Lehikoinen, Ugur Aydin, Anouar Belahcen, Fredrik Boxberg. Investigation of the Causes behind the Vibrations of a High-Speed Solid-Rotor Induction Motor. Journal of Sound and Vibration, 2019, Volume 463.
    DOI: 10.1016/j.jsv.2019.114976 View at publisher
  • [Publication 6]: Sabin Sathyan, Ugur Aydin, Anouar Belahcen. Acoustic Noise Computation of Electrical Motors using the Boundary Element Method. Energies, 2019, Volume 13.
    Full text in Acris/Aaltodoc:
    DOI: 10.3390/en13010245 View at publisher
  • [Errata file]: Errata of P1, P4