Abstract
Direct oil cooling of electrical machines is promising especially in the area of hybrid and electric traction drive trains, since it enables a high cooling efficiency and a large power density. Besides, a combined use of oils both as cooling fluid for the electrical machine and as lubricant for the transmission system helps to reduce the required installation space and subsequently increase the power density. For a proper application of oils in the electrical machine, the safety issues, especially the material compatibility of oils with the electrical machine, still need to be studied carefully. In the present work, the material compatibility between different types of cooling oils and machine components is studied. Results show that the traditional automatic transmission fluid has a poor material compatibility with the enamelled wire overall, and oil additives play a crucial role.
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