Experimental Investigation of Heat Transfer Processes in Spray Cooled Electric Motors (B05*)

• Subject Area: Fluid Mechanics
• Term: since 2026
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 492661287

The aim of this project is to gain a better understanding of spray-cooled electric motors through detailed experimental investigations of a generic electric motor where the cooling oil is introduced into the end spaces through holes in a hollow shaft. The optical access allows the use of advanced laser optical measurement techniques to measure oil film thickness, oil temperature, oil film dynamics, rotor surface temperature and flow dynamics. The influence of fluid dynamic processes on the heat transfer at the end windings and in the air gap and their effect on the torque losses will be investigated. The experimental data will support the development of a comprehensive model of spray-cooled electric motors.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 361: Computational Electric Machine Laboratory: Thermal Modelling, Transient Analysis, Geometry Handling and Robust Design
• Applicant Institution: Technische Universität Darmstadt
• Project Head: Professor Dr. Andreas Dreizler