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- W2900135352 abstract "For inductor and transformer circuit components that operate at higher frequencies, the existence of parasitic capacitance due to the winding structure determines the device's self-resonance frequency. It is desirable to have precise design and manufacturing control over the winding structure to properly control this capacitance for reduced manufacturing variability, suggesting lithographic or computer numerical controlled (CNC) fabrication. Lithographic or CNC methods, however, reduce the possible number of winding turns due to the high aspect-ratio of vias, limiting the device inductance. A 3-D printing technology offers the opportunity to increase the aspect-ratio limitation by fabricating only a thin layer at one time. In this paper, the process of 3-D printing transformer structures was explored with multiple variations. A Voxel8 printer was mostly used, with the ability to print plastic as well as conductive silver paste. Commercial and custom MnZn ferrites were used as core materials, as well as printed magnetic polylactic acid (PLA) plastic using a dual-extruder MAKEiT Pro-M printer. Windings were fabricated by either silver paste deposition interleaved with plastic layers or post-fabrication silver ink injection. It was found that interleaved silver paste deposition produced very low resistance windings (high quality factor inductor) when compared with injected silver ink but had a high probability of shorting windings. Injected silver ink windings were found to have higher reliability only when the parts are properly printed liquid tight. Inductances were in agreement with theoretical predictions for most fabricated devices, and resistances were much higher for injected silver ink windings than interleaved printed windings. The best broadband transformer performance, which is an optimal low winding resistance and high mutual inductance, was found for a 36 mm outer diameter, 23 mm inner diameter, and 10 mm-thick MnZn ferrite core with an eight-turn printed winding." @default.
- W2900135352 created "2018-11-16" @default.
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- W2900135352 date "2019-02-01" @default.
- W2900135352 modified "2023-10-17" @default.
- W2900135352 title "Exploration of the 3-D Printing of Transformer Structures With Embedded Ferrite Cores" @default.
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- W2900135352 doi "https://doi.org/10.1109/tmag.2018.2875811" @default.
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