Flow electrification phenomenon in forced air-cooled rotating electric machines

Metwally, I.A.; A-Rahim, A.A.

doi:10.1109/94.740784

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…graphite sheets [3] and thermomagnetic liquids [4] have been proposed, the vast majority of cooling systems in traction machines use direct or indirect liquid cooling of stator windings using oil [5] or a mixture of water-glycol. Compared to air cooling systems [6,7], a liquid cooling system [8,9] typically is more complex but results in smaller size, less weight and higher heat transfer rate. In a conventional liquid cooled machine, the stator outer bore is enclosed by a cooling jacket which removes the heat from the active parts of the electrical machine and dissipates it to ambient.…”

Section: Introductionmentioning

confidence: 99%

Thermal Modeling of Hollow Conductors for Direct Cooling of Electrical Machines

Chen

Wang

Griffo

et al. 2020

IEEE Trans. Ind. Electron.

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A direct cooling design using hollow conductors with the coolant flowing inside can significantly improve the heat dissipation in an electrical machine. To predict the thermal performances of an electrical machine with such cooling configuration, this paper proposes a computationally efficient thermal model of hollow conductors with direct cooling features. The hollow conductor is modelled using four equivalent solid cuboidal elements with a three dimensional thermal network and internal heat generation. The heat transfer coefficient between the coolant and conductors is determined by an empirical model considering fluid dynamics behaviors. Axial discretization is performed to take into account the non-uniform temperature distribution along the axial direction. Experimental validation is performed with a U-shaped hollow conductor test rig. Compared to computational fluid dynamics analysis, the proposed thermal model is much more computationally efficient, and thus can be incorporated into design optimization process and electro-thermal simulations of the electrical machine over a driving cycle. Index Terms-Thermal model, hollow conductor, direct cooling, electrical machine.

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