NDLI: Measurement of stator heat transfer in air-cooled axial flux permanent magnet machines

Content Provider	IEEE Xplore Digital Library
Author	Howey, D.A. Holmes, A.S. Pullen, K.R.
Copyright Year	2009
Description	Author affiliation: School of Engineering and Mathematical Sciences, Tait Building, City University, Northampton Square, London, EC1V 0HB, UK (Pullen, K.R.) \|\| Department of Electrical Electronic Engineering, Imperial College, Exhibition Road, London, SW7 2AZ, UK (Howey, D.A.; Holmes, A.S.)
Abstract	Relatively little fundamental research has been undertaken on heat transfer in disc type electrical machines, a common example being the axial flux permanent magnet (AFPM) machine. Power density is usually thermally limited and therefore understanding of stator convective heat transfer is crucial in the design of AFPM machines and electrical machines in general. This paper presents direct measurements of radially resolved stator convective heat transfer in a rotor-stator system, using a thin-film electrical heater array to measure heat transfer. The heater array combines surface temperature sensing with heat flux measurement. It is found for the three gap sizes considered here that average Nusselt number (non-dimensional convective heat transfer coefficient) increases from Nu ≈ 100 at low disc speeds/rotational Reynolds numbers (Reθmin = 3.7e4) up to Nu ≈ 300–400 at higher speeds (Reθmax = 5.6e5).
Starting Page	1197
Ending Page	1202
File Size	544877
Page Count	6
File Format	PDF
ISBN	9781424446483
ISSN	1553572X
e-ISBN	9781424446506
DOI	10.1109/IECON.2009.5414662
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-03
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stators Heat transfer Permanent magnet machines Temperature Resistance heating Electric variables measurement Permanent magnets Cogeneration Geometry Heat engines
Content Type	Text
Resource Type	Article

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