Thermal profile shaping and loss impacts of strain annealing on magnetic ribbon cores
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ARTICLE Thermal profile shaping and loss impacts of strain annealing on magnetic ribbon cores Richard Beddingfielda) and Subhashish Bhattacharya North Carolina State University, Raleigh, North Carolina, USA
Kevin Byerly National Energy Technology Laboratory, Pittsburgh, Pennsylvania, USA; and Contractor to the US Department of Energy, AECOM, Pittsburgh, Pennsylvania, USA
Satoru Simizu Material Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
Alex Leary Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio, USA
Mike McHenryb) Material Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
Paul Ohodnicki National Energy Technology Laboratory and Materials Science and Engineering, Carnegie Melon University, Pittsburgh, Pennsylvania, USA (Received 13 January 2018; accepted 7 May 2018)
The use of the advanced manufacturing technique of strain annealing for nanocomposite magnetic ribbons enables control of relative permeabilities and spatially dependent permeability profiles. Tuned permeability profiles enable enhanced control of the magnetic flux throughout magnetic cores, including the concentration or dispersion of the magnetic flux over specific regions. Due to the correlation between local core losses and temperature rises with the local magnetic flux, these profiles can be tuned at the component level for improved losses and reduced steady-state temperatures. We present analytical models for a number of assumed permeability profiles. This work shows significant reductions in the peak temperature rise with overall core losses impacted to a lesser extent. Controlled strain annealing profiles can also adjust the location of hotspots within a component for optimal cooling schemes. As a result, magnetic designs can have improved performance for a range of potential operating conditions.
I. INTRODUCTION
Passive device designs must meet the stringent requirements brought about by the continued increase in capabilities and adoption rates of wide band gap power semiconductors. Specifically, magnetic component designs need to consider new operating spaces and to take advantage of new soft magnetic materials and material processing. Generally, power converter controls and topologies are moving toward very high efficiencies through soft switching techniques that greatly reduce the losses associated with the switching devices. This in turn means that a dominant loss component of a power a)
Address all correspondence to this author. e-mail: [email protected] b) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs. org/editor-manuscripts/. DOI: 10.1557/jmr.2018.157 J. Mater. Res., 2018
converter will be the passive devices and specifically the magnetic components.1–3 Furthermore, magnetic components will continue to play a critical role in power converters due to their energy storage and isolation capabilities. T
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