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Article

Impact of Current Density and Cooling on the Weight Balance of Electrical Propulsion Drives for Aviation

1
Cluster of Excellence SE²A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38108 Braunschweig, Germany
2
Institut für Elektrische Maschinen, Antriebe und Bahnen, Technische Universität Braunschweig, 38106 Braunschweig, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(22), 6149; https://doi.org/10.3390/en13226149
Received: 27 October 2020 / Revised: 18 November 2020 / Accepted: 19 November 2020 / Published: 23 November 2020
(This article belongs to the Special Issue Electrical Machine Design 2020)
Through applying an exemplary design study, the dependencies between current density, temperatures, and weight in an electrical drive system for a small range aircraft with conventional electrical fan or propeller drives are evaluated. This study applies a combined numerical (Finite Element Method FEM) and analytical approach to the machine design, calculation of temperatures, and cooling system design (cooler, pumps, piping). A design scenario was defined using start and climb flight in a warm tropical surrounding as the worst load case. The design has to move between two fixed temperature limits: The maximum allowable temperature in the machine insulation and the ambient temperature. The implemented method facilitates a comparatively fast-medium depth design of the drive system. The derived results show, in fact, a minimum of weight at a certain current density, which is one of the key interests for the designers of the electrical machine. The main influences on this minimum are the temperature drops in the machine, the heat transfer to the cooling fluid, the heat transfer to the cooler wall, and the remaining heat rejection to the ambient. Method and results are transferable to other types of airplanes with different ratings. View Full-Text
Keywords: electrical aviation drives; lightweight machine design; high current density design; direct slot cooling; minimum weight; polysiloxan cooling fluids; surface cooler electrical aviation drives; lightweight machine design; high current density design; direct slot cooling; minimum weight; polysiloxan cooling fluids; surface cooler
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MDPI and ACS Style

Hoffmann, J.; Canders, W.-R.; Henke, M. Impact of Current Density and Cooling on the Weight Balance of Electrical Propulsion Drives for Aviation. Energies 2020, 13, 6149. https://doi.org/10.3390/en13226149

AMA Style

Hoffmann J, Canders W-R, Henke M. Impact of Current Density and Cooling on the Weight Balance of Electrical Propulsion Drives for Aviation. Energies. 2020; 13(22):6149. https://doi.org/10.3390/en13226149

Chicago/Turabian Style

Hoffmann, Jan, Wolf-Rüdiger Canders, and Markus Henke. 2020. "Impact of Current Density and Cooling on the Weight Balance of Electrical Propulsion Drives for Aviation" Energies 13, no. 22: 6149. https://doi.org/10.3390/en13226149

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