Air-Gap Convection in Rotating Electrical Machines

This paper reviews the convective heat transfer within the air gap of both cylindrical and disk geometry rotating electrical machines, including worked examples relevant to fractional horsepower electrical machines. Thermal analysis of electrical machines is important because torque density is limit...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2012-03, Vol.59 (3), p.1367-1375
Main Authors: Howey, D. A., Childs, P. R. N., Holmes, A. S.
Format: Article
Language:English
Subjects:
Air gaps
Convection
Convective heat transfer
Correlation
Density
Disks
electrical machine
Equations
Fluid flow
Geometry
Heat transfer
Mathematical model
Mathematical models
Rotating electrical machines
Rotors
Studies
Thermal analysis
Turbulent flow
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Summary:This paper reviews the convective heat transfer within the air gap of both cylindrical and disk geometry rotating electrical machines, including worked examples relevant to fractional horsepower electrical machines. Thermal analysis of electrical machines is important because torque density is limited by maximum temperature. Knowledge of surface convective heat transfer coefficients is necessary for accurate thermal modeling, for example, using lumped parameter models. There exists a wide body of relevant literature, but much of it has traditionally been in other application areas, dominated by mechanical engineers, such as gas turbine design. Particular attention is therefore given to the explanation of the relevant nondimensional parameters and to the presentation of measured convective heat transfer correlations for a wide variety of situations from laminar to turbulent flow at small and large gap sizes for both radial-flux and axial-flux electrical machines.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2010.2100337