Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 57, Issue 3, Pages 2378-2386Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2021.3059811
Keywords
Oils; Cooling; Heating systems; Thermal resistance; Copper; Coils; Three-dimensional displays; Axial flux; electric vehicle; electrical machines; finite-element analysis; hybrid electric vehicle; oil cooling; permanent magnet; thermal analysis; thermal modelling; traction motors
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This paper proposes a novel direct oil cooling system for Torus-type axial-flux permanent-magnet machines, and demonstrates its effectiveness through lumped thermal equivalent circuit simulations, finite element analyses, and experimental tests. The expected performances of the machine with the proposed cooling system are compared to those achieved using state-of-the-art water cooling.
In high power density applications, such as electric or hybrid electric vehicles, heat extraction is a crucial aspect of electrical machine design due to stringent volume specifications. In these cases, it is extremely difficult, if at all possible, to satisfy the maximum temperature requirement when using conventional cooling systems, such as housing fins, shaft-mounted fans or even water jackets. To this end, a novel direct oil cooling system conceived for Torus-type axial-flux permanent-magnet machines is proposed here. In order to demonstrate its effectiveness, lumped thermal equivalent circuit simulations, finite element analyses and experimental tests are presented. The expected performances of the machine using the proposed direct oil cooling are compared to those obtained using state of the art water cooling.
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