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Refroidissement des moteurs électriques : exploration des solutions à huile de lubrification

Abstract : Electric motor is one of the most important elements of an electric vehicle. Some elements, particularly the windings, can be affected by rising heat. External cooling, as water jacket in the case, appears to be limited because the losses generated in windings must pass through zones where conduction is very poor. Cooling in the core of the machine is preferable, but heat transfer with air is poor. Due to the presence of lubricating oil in the vicinity of the motor and the heat transfer enhancement that such a liquid provides, oil circulation on the windings has been considered.The research was first dedicated to an extensive bibliography on the different solutions of motor cooling. Then heat transfer within the motor was modelled by using the lumped system analysis. Thanks to a sensitivity analysis, the main parameters affecting temperature have been identified before cooling systems were modelled. Finally, tests were performed on a specially designed bench. Oil was introduced at each side of the machine to directly cool the stator coil end-windings. Several oil injection patterns were tested. The influence of the oil flow rate, rotation speed and oil temperature has been investigated.The objective of this PHD study is to analyse all the thermal issues related to the oil cooling systems. This is a comparative study of the performance of the oil cooling solutions. Comparison is also done with conventional water cooling.
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  • HAL Id : tel-02003330, version 1

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Tanguy Davin. Refroidissement des moteurs électriques : exploration des solutions à huile de lubrification. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambresis, 2014. Français. ⟨NNT : 2014VALE0003⟩. ⟨tel-02003330⟩

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