Manufacturing of tooth coil winding PM machines with in-slot oil cooling

Acquaviva, Alessandro,1987Chalmers tekniska högskola,Chalmers University of Technology (author)

This paper presents a description of the manufacturing challenges and solutions of two 50 kW radial flux inner-rotor tooth coil winding PM machines with in-slot cooling for vehicle application. The two machines are designed for different DC link voltages, 600 V and 48 V, and to achieve high efficiency and high power density. To enable this, liquid cooling is necessary. In the solution presented, the oil coolant is pushed through the stator yoke and in the slots with the intent of removing the heat close to the loss generation. The cooling channels in the slots are built during the stator potting process using a high thermally conductive potting material. The machines presented in this paper are designed for high speed operation and capable to withstand RMS current densities of 25 A/mm2 in continuous operation and 35 A/mm2 for 30 s peaks, at 6 1/min oil flow and a inlet temperature of 20oC. It is shown that stator is designed to be compatible with automated manufacturing for high volume production with a set of suggested improvements.

Skoog, Stefan,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoogs (author)
Thiringer, Torbjörn,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)thorbear (author)
Chalmers tekniska högskola (creator_code:org_t)

In:Proceedings - 2020 International Conference on Electrical Machines, ICEM 2020, s. 2314-23209781728199450

By the author/editor: Acquaviva, Aless ...; Skoog, Stefan, 1 ...; Thiringer, Torbj ...

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