Computations on heat transfer in axial flux permanent magnet machines

Airoldi, G.; Ingram, Grant; Mahkamov, Khamid; Bumby, J.R.; Dominy, Robert; Brown, Neil L.; Mebarki, Abdeslam; Shanel, M.

doi:10.1109/icelmach.2008.4799857

Cited by 24 publications

(26 citation statements)

References 3 publications

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“…However, the radial velocity profiles showed a very different flow pattern to R1. It was found that the main route for radial outflow of fluid was in the slot between protrusions and only a small amount of fluid flows out near the rotor underneath the protrusions; this agrees well with the simulation results of Airoldi et al [7]. The streamlines, figure 8, show that fluid is entrained into the channel between magnets/ protrusions and flung outwards, like a crude radial fan.…”

Section: B Rotor With Protrusions (R2)supporting

confidence: 80%

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Prediction and measurement of heat transfer in air-cooled disc-type electrical machines

Howey¹,

Holmes²,

Pullen³

2010

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

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Index Terms-Axial flux permanent magnet machine, disc type machine, stator heat transfer, thermal analysis, CFD 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 and the SST model was used for most of the simulations.

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Section: B Rotor With Protrusions (R2)supporting

confidence: 80%

“…Few studies have applied CFD to AFPM machines. Airoldi et al [6], [7] undertook CFD modelling of the fluid flow in an AFPM machine, finding good correspondence between CFD and experiment for mass flow rates and temperatures, although a limited experimental data set is presented.…”

Section: Introductionmentioning

confidence: 99%

Prediction and measurement of heat transfer in air-cooled disc-type electrical machines

Howey¹,

Holmes²,

Pullen³

2010

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

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“…Few studies have applied CFD to AFPM machines. Airoldi et al [7], [8] undertook CFD modelling of the fluid flow in an AFPM machine, finding good correspondence between CFD and experiment for mass flow rates and temperatures, although a limited experimental data set is presented.…”

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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“…Airoldi et al [8] undertook CFD modelling of the fluid flow in an AFPM machine, with some experimental validation, using a geometric mock-up of an AFPM machine including a rotor with protrusions to simulate the effect of the permanent magnets on the airflow. The stator was a heated aluminium block.…”

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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Computations on heat transfer in axial flux permanent magnet machines

Cited by 24 publications

References 3 publications

Prediction and measurement of heat transfer in air-cooled disc-type electrical machines

Prediction and measurement of heat transfer in air-cooled disc-type electrical machines

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

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

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