Calculation of AC loss in a High-Speed Coreless Axial-flux Machine under No Load and Load Conditions using a Hybrid Method

The winding eddy current loss can cause a dangerous temperature rise in an electric machine, especially in a coreless topology. The coreless axial-flux machine is an unconventional machine configuration with many advantages, but its application is limited due to the winding eddy current loss. Howeve...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2024-03, Vol.60 (3), p.1-1
Main Authors: Nguyen, Tung, Lee, Ji-heon, Kang, Jea-beom, Lee, Ji-young
Format: Article
Language:English
Subjects:
ac loss
analytical method
Analytical models
axial-flux machines
Computing time
Conductors
coreless machines
Current loss
Eddy current testing
Eddy currents
Finite element method
Temperature measurement
Thermal analysis
Three-dimensional displays
Topology
Winding
Windings
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Summary:The winding eddy current loss can cause a dangerous temperature rise in an electric machine, especially in a coreless topology. The coreless axial-flux machine is an unconventional machine configuration with many advantages, but its application is limited due to the winding eddy current loss. However, this problem has not yet been studied extensively in previous literature due to the relatively new topology. Furthermore, it is very difficult to analyze this loss accurately, because it would usually require modeling each of the machine's conductors, extending the designing and computation time significantly. This article is one of the few that utilize a hybrid method to calculate winding ac loss with both analytical method and simplified 3D finite element analysis of a coreless axial-flux machine, under both no load and load conditions. This method can reduce the computation time while giving relatively good accuracy, making the coreless axial-flux topology becomes more feasible. Losses at multiple sizes of conductors were calculated using this method and thermal analysis was performed with 3D FEA to determine which conductor size will not cause the thermal problem. The analysis results of losses and temperature are then validated with test results.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2023.3325999