Heat-transfer improvements in an axial-flux permanent-magnet synchronous machine
Pyrhönen, Juha; Lindh, Pia; Polikarpova, Maria; Kurvinen, Emil; Naumanen, Ville (2014)
Post-print / final draft
Pyrhönen, Juha
Lindh, Pia
Polikarpova, Maria
Kurvinen, Emil
Naumanen, Ville
2014
Pergamon Press
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201504092383
https://urn.fi/URN:NBN:fi-fe201504092383
Tiivistelmä
Axial-flux machines tend to have cooling difficulties since it is difficult to arrange continuous heat path between the stator stack and the frame. One important reason for this is that no shrink fitting of the stator is possible in an axial-flux machine. Using of liquid-cooled end shields does not alone solve this issue. Cooling of the rotor and the end windings may also be difficult at least in case of two-stator-single-rotor construction where air circulation in the rotor and in the end-winding areas may be difficult to arrange. If the rotor has significant losses air circulation via the rotor and behind the stator yokes should be arranged which, again, weakens the stator cooling. In this paper we study a novel way of using copper bars as extra heat transfer paths between the stator teeth and liquid cooling pools in the end shields. After this the end windings still suffer of low thermal conductivity and means for improving this by high-heat-conductance material was also studied. The design principle of each cooling system is presented in details. Thermal models based on Computational Fluid Dynamics (CFD) are used to analyse the temperature distribution in the machine. Measurement results are provided from different versions of the machine. The results show that significant improvements in the cooling can be gained by these steps.
Lähdeviite
Juha Pyrhönen, Pia Lindh, Maria Polikarpova, Emil Kurvinen, Ville Naumanen (2015) Heat-transfer improvements in an axial-flux permanent-magnet synchronous machine. Applied Thermal Engineering, Volume 76, 5 February, Pages 245-251 DOI:10.1016/j.applthermaleng.2014.11.003
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