Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application

Alessandro Acquaviva, Stefan Skoog, Emma Grunditz and Torbjörn Thiringer
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Alessandro Acquaviva: Department of Electrical Engineering, Chalmers University of Technology, Hörsalsvägen 9-11, 41296 Gothenburg, Sweden
Stefan Skoog: Department of Electrical Engineering, Chalmers University of Technology, Hörsalsvägen 9-11, 41296 Gothenburg, Sweden
Emma Grunditz: Department of Electrical Engineering, Chalmers University of Technology, Hörsalsvägen 9-11, 41296 Gothenburg, Sweden
Torbjörn Thiringer: Department of Electrical Engineering, Chalmers University of Technology, Hörsalsvägen 9-11, 41296 Gothenburg, Sweden

Energies, 2020, vol. 13, issue 13, 1-20

Abstract: Tooth coil winding machines offer a low cost manufacturing process, high efficiency and high power density, making these attractive for traction applications. Using direct oil cooling in combination with tooth coil windings is an effective way of reaching higher power densities compared to an external cooling jacket. In this paper, the validation of the electromagnetic design for an automotive 600 V, 50 kW tooth coil winding traction machine is presented. The design process is a combination of an analytical sizing process and FEA optimization. It is shown that removing iron in the stator yoke for cooling channels does not affect electromagnetic performance significantly. In a previous publication, the machine is shown to be thermally capable of 25 A/mm 2 (105 Nm) continuously, and 35 A/mm 2 (140 Nm) during a 10 s peak with 6 l/min oil cooling. In this paper, inductance, torque and back EMF are measured and compared with FEA results showing very good agreement with the numerical design. Furthermore, the efficiency of the machine is validated by direct loss measurements, using a custom built calorimetric set-up in six operating points with an agreement within 0.9 units of percent between FEA and measured results.

Keywords: permanent magnet machines; electromagnetic design; model verification; performance evaluation; calorimetric measurement; oil cooling; efficiency validation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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