Zlatko Kolondzovski's doctoral dissertation on electromechanics
06.08.2010 / 12:00 - 15:00
Methods for the thermal and mechanical analyses of high-speed PM electrical machines are presented and implemented. The first method implemented for the thermal analysis is a combined 2D-3D numerical method. The thermal and turbulent properties of the flow, such as the temperature rise in the flow and the coefficients of thermal convection, are estimated using a 2D multiphysics method that couples CFD with heat-transfer equations.
The detailed distribution of the temperature rise in the whole solid domain of the machine is determined using a 3D numerical heat-transfer method. The temperature rises in the machine are also estimated with the traditional thermal-network method, which uses a totally different approach to the heat-transfer analysis.
The methods used for the mechanical analysis of the machine include finite-element rotordynamics modelling of the rotor for estimation of the critical speeds and the shapes of the bending modes and also analytical estimation of the stress in the retaining sleeve. The implemented methods are used for the comparative thermal and mechanical analyses of three different high-speed PM rotor constructions and also for the determination of the maximum power limits for high-speed PM electrical machines for air-compressor applications.
Doctoral candidate: M.Sc. Zlatko Kolondzovski
Title: Thermal and mechanical analyses of high-speed permanent-magnet electrical machinesDate
Opponent: Professor Aldo Boglietti, Politecnico di Torino, Dipartimento di Ingegneria Elettrica, 10129 Turin, Italy.
Supervisor: Professor Antero Arkkio, Aalto University School of Science and Technology, Finland.
More information:
http://lib.tkk.fi/Diss
Zlatko Kolondzovski
zlatko.kolondzovski@tkk.fi
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