Design and Verification of In-slot Oil-Cooled Tooth Coil Winding PM Machine for Traction Application
Journal article, 2021

Tooth coil windings, in particular when using a double layer structure, present opportunities for in-slot liquid cooling. Since the windings are not overlapping, access to the slot from the end section for coolant liquids is enabled. In this paper, a solution for in-slot and instator direct oil cooling for a tooth coil winding machine is presented. The coils are pre-wound on bobbins and inserted on the stator teeth. The novelty of the design consists in the integration of the cooling, using a thermally conductive epoxy resin to create the channels within the slot as well as the positioning of the stator yoke cooling channels. A 50 kW machine for an automotive traction application is designed, manufactured and tested. Conjugate heat transfer simulations are used in the design process in combination with finite element analysis for the loss mapping. The thermal model is verified with measurements at 6 l/min oil flow and 17.5 A/mm2 continuous and 35 A/mm2 30 s peak. The thermal model is then used to establish a continuous operating point of 25 A/mm2 .

Permanent magnet motors

Cooling

Modeling

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

IEEE Transactions on Industrial Electronics

0278-0046 (ISSN)

Vol. 68 5 3719-3727

Multiphysics simulatin of cooling systems and its components in an electrical/hybrid vehicle

Swedish Energy Agency, 2016-03-01 -- 2019-12-31.

Areas of Advance

Transport

Energy

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TIE.2020.2985009

More information

Latest update

3/16/2021