Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Experimentally established build factors for electromagnetic performance in a bonded NO20 stator stack

Fyhr, Pontus LU ; Skoog, Stefan ; Colombo, Leonardo LU and Reinap, Avo LU orcid (2025) 27th Soft Magnetic Material conference
Abstract
The electromagnetic performance of the soft magnetic core in manufactured electric machines is known to deviate significantly from datasheet values for the material used in the core. We quantify the discrepancy in permeability and losses between datasheet and physical units by calculating build factors for a typical hairpin IPM traction machine design. The derived build factors for losses are typically 1.5 at high frequency below 1 T, while approaching unity at flux densities approaching 2 T for all tested frequencies. At low frequency and low flux density, the loss build factor is peaking at 4. Permeability build factor starts at 0.6 at low flux density, dips to 0.35 at 1 T, and reaches unity at 1.5 T. All data used for this research is... (More)
The electromagnetic performance of the soft magnetic core in manufactured electric machines is known to deviate significantly from datasheet values for the material used in the core. We quantify the discrepancy in permeability and losses between datasheet and physical units by calculating build factors for a typical hairpin IPM traction machine design. The derived build factors for losses are typically 1.5 at high frequency below 1 T, while approaching unity at flux densities approaching 2 T for all tested frequencies. At low frequency and low flux density, the loss build factor is peaking at 4. Permeability build factor starts at 0.6 at low flux density, dips to 0.35 at 1 T, and reaches unity at 1.5 T. All data used for this research is made available in the public domain. (Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to conference
publication status
published
subject
conference name
27th Soft Magnetic Material conference
conference location
Torino, Italy
conference dates
2025-09-08 - 2025-09-11
language
English
LU publication?
yes
id
8fbef4a3-05b7-4d09-b8e2-e1bdae7a1827
date added to LUP
2026-01-30 09:55:15
date last changed
2026-01-30 14:25:34
@misc{8fbef4a3-05b7-4d09-b8e2-e1bdae7a1827,
  abstract     = {{The electromagnetic performance of the soft magnetic core in manufactured electric machines is known to deviate significantly from datasheet values for the material used in the core. We quantify the discrepancy in permeability and losses between datasheet and physical units by calculating build factors for a typical hairpin IPM traction machine design. The derived build factors for losses are typically 1.5 at high frequency below 1 T, while approaching unity at flux densities approaching 2 T for all tested frequencies. At low frequency and low flux density, the loss build factor is peaking at 4. Permeability build factor starts at 0.6 at low flux density, dips to 0.35 at 1 T, and reaches unity at 1.5 T. All data used for this research is made available in the public domain.}},
  author       = {{Fyhr, Pontus and Skoog, Stefan and Colombo, Leonardo and Reinap, Avo}},
  language     = {{eng}},
  title        = {{Experimentally established build factors for electromagnetic performance in a bonded NO20 stator stack}},
  url          = {{https://lup.lub.lu.se/search/files/240956966/SMM_poster-2.pdf}},
  year         = {{2025}},
}