Additive manufacturing and performance of E-Type transformer core

Hans Tiismus*, Ants Kallaste, Anouar Belahcen, Anton Rassõlkin, Toomas Vaimann, Payam Shams Ghahfarokhi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Additive manufacturing of ferromagnetic materials for electrical machine applications is maturing. In this work, a full E-type transformer core is printed, characterized, and compared in terms of performance with a conventional Goss textured core. For facilitating a modular winding and eddy current loss reduction, the 3D printed core is assembled from four novel interlocking components, which structurally imitate the E-type core laminations. Both cores are compared at approximately their respective optimal working conditions, at identical magnetizing currents. Due to the superior magnetic properties of the Goss sheet conventional transformer core, 10% reduced efficiency (from 80.5% to 70.1%) and 34% lower power density (from 59 VA/kg to 39 VA/kg) of the printed transformer are identified at operating temperature. The first prototype transformer core demonstrates the state of the art and initial optimization step for further development of additively manufactured soft ferromagnetic components. Further optimization of both the 3D printed material and core design are proposed for obtaining higher electrical performance for AC applications.

Original languageEnglish
Article number3278
Number of pages14
Issue number11
Publication statusPublished - 3 Jun 2021
MoE publication typeA1 Journal article-refereed


  • Additive manufacturing
  • Iron losses
  • Magnetic properties
  • Selective laser melting
  • Soft magnetic materials
  • Transformer


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