Abstract
A novel inverter and a corresponding high-powered electric machine (“motor”) were developed for a hybrid vehicle. The inverter is a compact oil cooled silicon MOSFET design rated at 25 kW that drives a frameless 6-phase 8 pole, interior permanent magnet (IPM) motor with oil (Automatic Transmission Fluid, ATF) cooling and novel windings. Both Oil- and water-cooled inverter variants were explored. Both the inverter and the motor were designed, built and tested to A-sample level. A major aim of the design was to make it possible to cool the motor, inverter and gearbox from the same oil supply. The focus of the work presented in this paper is reducing the thermal resistance of the inverter through the use of impingement jet cooling. Cooling of the electrically live tab of MOSFETs is well known to reduce thermal impedance, hence improving performance; this was achieved in the oil-cooled design by exploiting the oil’s electrical insulating property.
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Acknowledgements
This work was conducted as part of the ECOCHAMPS project, that received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement no. 653468, which addressed the topic GV-04-2014 ‘Hybrid Light and Heavy-Duty Vehicles’ of the Green Vehicles work programme.
In addition, there are others who provided significant contribution to the development of this inverter, namely Kevin Heffer, Jan Majer, Jiri Naprstek, Radovan Svoboda and Petros Alexakis. Special thanks go to Charlie Elliott, Alan Yarker and Mark Berry at Smart Power Solutions LLP for their invaluable support throughout.
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Alger, L., Haybittle, J., Wearing, A.D., Rouaud, C., Drury, W.D. (2020). A 25 kW 48 V Mild Hybrid Motor and Inverter. In: CTI SYMPOSIUM 2018. Proceedings. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-58866-6_1
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DOI: https://doi.org/10.1007/978-3-662-58866-6_1
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