Design of a Direct-Liquid-Cooled Motor and Operation Strategy for the Cooling System

Ralf Johannes Keuter (), Florian Niebuhr, Marius Nozinski, Eike Krüger, Stephan Kabelac and Bernd Ponick
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Ralf Johannes Keuter: Cluster of Excellence SE2A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38106 Brauschweig, Germany
Florian Niebuhr: Institute for Drive Systems and Power Electronics, Leibniz Universität Hannover, 30823 Garbsen, Germany
Marius Nozinski: Cluster of Excellence SE2A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38106 Brauschweig, Germany
Eike Krüger: Cluster of Excellence SE2A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38106 Brauschweig, Germany
Stephan Kabelac: Cluster of Excellence SE2A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38106 Brauschweig, Germany
Bernd Ponick: Cluster of Excellence SE2A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, 38106 Brauschweig, Germany

Energies, 2023, vol. 16, issue 14, 1-14

Abstract: To make an all-electric aircraft possible, both high power densities and efficiencies are needed. However, particularly high demands are also placed on the thermal management system. Often, the electric motor and cooling system are considered without co-optimization. Particularly in the case of electric motors with conductors directly cooled by a liquid, there is great potential for optimization, since the temperature-dependent Joule losses determine the largest part of the losses. This publication shows the main influencing parameters for the electric motor and cooling system: coolant speed and winding temperature. In addition, the influence of the cooling system control during a flight mission is demonstrated and its potential in mass reduction is quantified. It could be shown that with a low utilized electric motor the maximum winding temperature of 130 ° C is beneficial, the cooling system should work in almost all operation points in its sized operation and the mass of the heat exchanger and pump is negligible compared to the mass of the electric motor and energy storage.

Keywords: all-electric aircraft; aircraft propulsion; coolant velocity; electric propulsion system; electric aircraft; permanent magnet synchronous motor; winding temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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