Thermal modeling of an asymmetrical totally enclosed permanent magnet integrated starter generator

Khlissa, Radhouane; Vivier, Stéphane; Friedrich, Guy; Benkara, Khadija El Kadri; Assaad, Bassel

doi:10.1016/j.matcom.2015.06.015

Cited by 9 publications

(3 citation statements)

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“…Measurements of the torque, the rotation speed, the current and the voltage are experimentally performed. ISG losses are analytically calculated and they are in a good agreement with experimental data [11]. Several thermal tests are performed for different operating conditions: rotation speeds in the range 0 to 4000rpm and DC current densities J in the range 0 to 5 A/mm 2 .…”

Section: B Description Of the Experimental Proceduressupporting

confidence: 60%

“…Fig.14 and Fig.15 show a comparison between measured and estimated temperatures for two operating points. [11] In the study range of speeds (Ω ≤ 4000 rpm), the uncertainty on the estimation of the convective heat transfer in the air gap does not impact considerably the prediction of temperatures in rotor and stator. However, numerical CFD simulations provide a better understanding of the mechanism of heat transfer in a rotor-stator system.…”

Section: Resultsmentioning

confidence: 99%

“…Because of the complexity of the heat transfer mechanism for these rotation speeds, considering the whole system seems mandatory to understand correctly the way heat flux pass through the air gap. The thermal network model of the ISG [11] is deployed using experimental losses. Fig.…”

Section: Resultsmentioning

confidence: 99%

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Numerical approach for thermal analysis of heat transfer into a very narrow air gap of a totally enclosed permanent magnet integrated starter generator

Nachouane

Abdelli

Friedrich

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper proposes a detailed numerical model of a very narrow air gap of a permanent magnet synchronous machine without an imposed axial flow. The flow structure analysis and the convective heat transfer are carefully investigated using an axisymmetric model of two concentric cylinders where the inner cylinder is rotating and the outer cylinder is stationary. For the different cases, only isothermal boundary conditions have been considered. The impact of the air gap mean temperature and of the rotation speed are thoroughly studied and all numerical findings are compared with analytical dimensionless correlations. CFD simulations show the existence of two critical Taylor numbers corresponding to the onset of further instabilities into the air gap which matches with theoretical and experimental previous results found in the literature. The Nusselt number distribution given by CFD shows a disparity with the dimensionless correlations which underestimate the effective convective heat transfer in very narrow air gaps. The numerical simulations allow the definition of a piecewise expression able to fit well the overall Nusselt number distribution over a relatively large range of Taylor numbers up to 3×10 4 . The present work shows the contribution of CFD numerical methods on the estimation of convection thermal resistances in very narrow air gaps.

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Section: B Description Of the Experimental Proceduressupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%