Manufacturing of tooth coil winding PM machines with in-slot oil cooling
Paper in proceeding, 2020

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.

tooth coil winding

pm machine

electrical vehicle

Author

Alessandro Acquaviva

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Stefan Skoog

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

2020 International Conference on Electrical Machines (ICEM)

2314-2320 9270747

2020 International Conference on Electrical Machines (ICEM)
Virutal, Göteborg, Sweden,

Areas of Advance

Transport

Energy

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/ICEM49940.2020.9270747

ISBN

9781728199450

More information

Latest update

6/2/2021 8