2-D lumped-parameter thermal modelling of axial flux permanent magnet generators

Haw, Lim Chin; Bumby, J.R.; Dominy, Robert; Ingram, Grant; Mahkamov, Khamid; Brown, Neil L.; Mebarki, Abdeslam; Shanel, M.

doi:10.1109/icelmach.2008.4799880

Cited by 34 publications

(22 citation statements)

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“…However, the air flow within a radial flux geometry is completely different to the air flow within a disc type machine, and the convective heat transfer correlations which are relevant to the former case cannot be applied to the latter. Recent work on the thermal aspects of disc type machines [3]- [5] has tended to focus on one-dimensional lumped parameter (LP) networks to represent both the solid domain and the fluid domain. These are fast to solve and widely used in electrical machine design.…”

Section: Introductionmentioning

confidence: 99%

Measurement and CFD Prediction of Heat Transfer in Air-Cooled Disc-Type Electrical Machines

Howey

Holmes

Pullen

2011

IEEE Trans. on Ind. Applicat.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-Accurate thermal analysis of axial flux permanent magnet (AFPM) machines is crucial in predicting maximum power output. Stator convective heat transfer is one of the most important and least investigated heat transfer mechanisms and is the focus of this paper. Experimental measurements were undertaken using a thin-film electrical heating method, providing radially resolved steady state heat transfer data from an experimental rotor-stator system designed as a geometric mockup of a through-flow ventilated AFPM machine. The measurements are compared with computational fluid dynamics (CFD) simulations using both 2D axisymmetric and 3D models. These were found to give a conservative estimate of heat transfer, with inaccuracies near the edge and in the transitional flow regime. Predicted stator heat transfer was found to be relatively insensitive to the choice of turbulence model used in the CFD simulations. Permanent repository link

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Section: Introductionmentioning

confidence: 99%

Measurement and CFD Prediction of Heat Transfer in Air-Cooled Disc-Type Electrical Machines

Howey

Holmes

Pullen

2011

IEEE Trans. on Ind. Applicat.

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“…The variation in the temperature of the air flow affects the thermal state of the solid components of these generators. Lim et al [15] proposed a new technique for constructing a 2D equivalent thermal circuit for AFPM generators which takes into account the temperature change in the air flow. In this approach the variation in the air flow temperature is taken into account by introducing additional thermal circuits to model the heat transfer between solid components and the air flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD investigation of a lumped parameter thermal model of a single-sided, slotted axial flux generator

Haw

Airoldi

Bumby

et al. 2010

International Journal of Thermal Sciences

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“…In a similar vein, Lim et al [7] developed a two-dimensional lumped parameter thermal model of an AFPM machine using thermal equivalent circuit networks for both the fluid flow and the stator, including thermal capacitance. Whilst lumped parameter thermal models have the advantage of being fast to solve, the approach is questionable for the modelling of the fluid domain because a gross assumption must be made about the fluid mechanics (i.e.…”

Section: Literature Reviewmentioning

confidence: 99%

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

Howey

Holmes

Pullen

2009

2009 35th Annual Conference of IEEE Industrial Electronics

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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 N u ≈ 100 at low disc speeds/rotational Reynolds numbers (Re θmin = 3.7e4) up to N u ≈ 300 − 400 at higher speeds (Re θmax = 5.6e5).

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2-D lumped-parameter thermal modelling of axial flux permanent magnet generators

Cited by 34 publications

References 1 publication

Measurement and CFD Prediction of Heat Transfer in Air-Cooled Disc-Type Electrical Machines

Measurement and CFD Prediction of Heat Transfer in Air-Cooled Disc-Type Electrical Machines

Experimental and CFD investigation of a lumped parameter thermal model of a single-sided, slotted axial flux generator

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

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