Design and performance of an additively manufactured high-Si transformer core

Plotkowski, A.; Carver, K.; List, F.; Pries, J.; Li, Z.; Rossy, A. Marques; Leonard, D.

doi:10.1016/j.matdes.2020.108894

Title: Design and performance of an additively manufactured high-Si transformer core

Journal Article · Tue Sep 01 00:00:00 EDT 2020 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2020.108894· OSTI ID:1633923

; Carver, K.; List, F.; Pries, J.; Li, Z.; Rossy, A. Marques; Leonard, D.

Additive manufacturing (AM) of functional alloys has become a promising area of research for the development of novel devices with complex geometric features that cannot be manufactured using conventional methods. In this work, we investigate the additive manufacturing of Fe₋3Si and Fe₋6Si benchtop scale transformer cores. A novel design inspired by a Hilbert curve was developed to exploit the geometric complexity of AM, and cores of each alloy were successfully printed, heat treated, machined, pickled, and assembled. The microstructure and magnetic performance of the cores were characterized and compared to additively manufactured components with simpler square cross-sections as well as to conventionally laminated non-oriented electrical steel sheet. The AM cores showed performance roughly comparable or better than the conventional non-oriented sheet, but higher power losses than Goss oriented steel. The increased Si content of the Fe₋6Si alloy resulted in a significant reduction in core losses. The transformer cores had higher losses than the similarly manufactured simple cross-sections, which was attributed to defects in fabrication and assembly that resulted in air gaps between the transformer legs. The performance was also rationalized relative to nanoscale carbide and oxide inclusions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Electricity (OE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1633923

Alternate ID(s):: OSTI ID: 1649242

Journal Information:: Materials & Design, Journal Name: Materials & Design Vol. 194 Journal Issue: C; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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