Timeline for Why does this metallic magnetic core have so little core losses up until 100s of kHz?
Current License: CC BY-SA 4.0
9 events
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| Jan 6, 2023 at 11:26 | comment | added | Tim Williams | @tobalt Precisely :) | |
| Jan 6, 2023 at 7:14 | comment | added | tobalt | @TimWilliams vitroperm is nanocrystalline. They anneal the amorphous tape to form small crystals (they also do in-field annealing for to set the transverse magn. anisotropy in case of the F type material). | |
| Jan 6, 2023 at 2:42 | comment | added | Tim Williams | I should specify, too: the material in question is such a glass based material. There are nanocrystalline composites, with low mu suitable for energy storage; but that's different. | |
| Jan 6, 2023 at 2:26 | comment | added | Tim Williams | Transformers are commonly used as common mode chokes, for filtering. CMCs may be defined as transformers, but aren't often sold that way so it may be worth clarifying that. They are rarely used for switching power conversion, but have niche applications for signal conversion (ye olde ISDN made excellent use of them). | |
| Jan 6, 2023 at 2:23 | comment | added | Tim Williams | It is a metallic material. It's a metallic glass with nano-sized crystals formed by annealing. The crystallinity does not define the metallicity; and it's not a composite or matrix formed from conventional (e.g. FeSi) particles. | |
| Jan 5, 2023 at 15:04 | comment | added | tobalt | Steel also contains carbon and I guess you would consider steel a metal, right ? Most metals, you use everyday are alloyed with "nonmetallic" elements. That doesn't make them nonmetals. VAC themselves call the VITROPERM alloy a metal, if you look at Figure 1 caption in the document linked in the question. | |
| Jan 5, 2023 at 15:00 | comment | added | Ken Grimes | More than "nanocrystalline" the important part is "alloy", specially Si and B are nonmetallic elements used in this type of alloys | |
| Jan 5, 2023 at 14:25 | comment | added | tobalt | Thanks, I didn't know that they are indeed used in SMPS. I thought only ferrites were. And why do you think that metals can't be nanocrystalline or amorphous ? "Metal" says nothing about the material microstructure. It does say something about conductivity though. And the conductivity of vitroperm surely qualifies it as a metal. | |
| Jan 5, 2023 at 14:20 | history | answered | Ken Grimes | CC BY-SA 4.0 |