Defence of dissertation in the field of Electromechanics, M.Sc. (Tech.) Sabin Sathyan

Why do Electrical Machines make noise? "An interesting journey of energy through electrical, magnetic, mechanical and acoustic forms”

The audible noise emitted by electrical motors has a complex nature of origin. Different electromagnetic, magnetomechanical and vibro-acoustic phenomena such as magnetic forces, magnetostriction, vibrations and sound-pressure variations are associated with the production of noise. A clear and detailed understanding of these phenomena through analytical and numerical modeling is an imperative factor in electrical machine technologies. The accurate computation and measurement of these parameters are important not only for the noise analysis, but also in other areas such as machine design, condition monitoring and fault diagnostics.

This thesis has succeeded in developing steadfast and regimented computational tools and experimental methods for magnetic forces, vibrations and noise in electrical motors in an intuitive fashion, and mainly using open-source software platforms. This dissertation successfully presents the curious ride of energy in electrical machines and proposes competent computational and experimental systems for calculating the associated parameters in different physical domains. The outcomes of this thesis in terms of experimental techniques and numerical calculation tools can be employed in different areas of electrical machine technologies such as electrical motors in electric vehicles, industrial systems, household and commercial appliances and power systems.

Opponent: Professor Chris Gerada, University of Nottingham, United Kingdom

Custos: Professor Anouar Belahcen, Aalto University School of Electrical Engineering, Department of Electrical Engineering and Automation.

Dissertation web page

Contact information: Sabin Sathyan, Aalto University School of Electrical Engineering, Department of Electrical Engineering and Automation, [email protected], +358 406628668

The dissertation is publicly displayed 10 days before the defence at the noticeboard of the School of Electrical Engineering in Maarintie 8, Espoo