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Master Thesis: Thermal properties of coolant oil for applications within electrification

RISE is the Swedish Research Institute and innovation partner. In international collaboration with industry, academia and the public sector, we ensure the competitiveness of the business community and contribute to a sustainable society. Our 2,700 employees support and promote all manner of innovative processes. RISE is an independent, state-owned research institute that offers unique expertise and about 100 testbeds and demonstration facilities, instrumental in future-proofing technologies, products and services. www.ri.se


Scania has decided to lead the development of sustainable transport systems where electrification of the transport system is an indispensable part. It is also an area where technology is developing very fast. A central part in the electrification development is the electrical machine (EM), which acts both as an electric motor and an electric generator. In hybrid solutions the EM is often embedded in the gearbox with joint oil system. In the gearbox the oil’s main purposes is lubrication. In contrast, the critical oil properties in the EM are cooling capacity, electrical insulation, and chemical compatibility of the system, where the former will be in focus within this Master’s thesis work. The aim is to develop a method in order to verify lubricants’ coolant properties in EMs, which in turn can be used to improve the function of the electrified propulsion system.


This study will investigate the cooling capacity of the oil including thermal conductivity, wettability, surface adhesion, and heat transfer. The aim is to differentiate between different oils designed for EMs. The expected benefit would be better fuel economy, longer up-time and increased effective engine power. The objective is to develop a test method where a contact angle instrument is combined with an IR-camera. The study will screen different oils and different substrates using this method and correlate test results with component (EM) testing.

Test methods to be used are contact angle device with camera and IR sensor, Wilhelmy balance to evaluate run off and calorimeter for determining oil heat capacity. The test fluids will be different gearbox and transformer oils currently used but also prototype oils. The test substrates will be polyester & copper.

Profile of applicant

We are looking for one student with chemical, physics or materials engineering background with experience from laboratory work to carry out their MSc thesis at RISE and KTH in Stockholm in cooperation with Scania CV AB in Södertälje, starting early 2019.


If you have any questions, please contact Mikael Järn at RISE +46 10 516 60 68 or Per Claesson at KTH (percl(a)kth.se). Apply by sending your CV and Personal letter no later than January 10, 2019.

Master Thesis, RISE, Stockholm, KTH, Scania, chemical, physics, materials.





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