Table of Contents
FRM20/5/15
| Stan Zurek, FRM20/5/15, Encyclopedia Magnetica, https://www.e-magnetica.pl/doku.php/frm20-5-15 |
| reviewed by Jeanete Leicht, 2014-01-21 |
FRM20/5/15 (also FRM20-5-15 or FRM 20 x 5 x 15) - a type of frame core made of soft ferrite, supplied by Ferroxcube.1)
The numbers refer to the dimensions of the frame, i.e. 20 = 20 mm.
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The core comprises a cuboid bar, which slides into a bobbin. The outer frame of the core is assembled on top of the bobbin.
The bar has a symbol BAR20/3/5.5 (or BAR20-3-5.5).
The relative winding width is longer than in most of other ferrite cores, which allows for the bobbin to have multiple sections. The manufacturer offers the multiple-chamber bobbin, but there is no indication of how all the parts should be held together (e.g. a clip).
As of 2013 the core was offered in two materials: 3C90 and 3C91.
Images
Core parameters
The table below lists the core set parameters as given by Ferroxcube.2)
| Symbol | Parameter | Value |
|---|---|---|
| Σ(l/A) | core factor (C1) | 3.29 mm-1 |
| Ve | effective volume | 655 mm |
| le | effective length | 46 mm |
| Ae | effective area | 14 mm2 |
| Amin | minimum area | 7.4 mm2 |
| m | mass of frame | 2.1 g |
| m | mass of bar | 1.5 g |
The values were measured for frame with a bar core, without an air gap.3)
| Material grade | AL value | effective permeability μe |
|---|---|---|
| 3C90 | 500 nH +/- 25% | 1310 |
| 3C91 | 600 nH +/- 25% | 1570 |
Data sheets
Ferrite core FRM20/5/15 Ferroxcube
Copyrights © Ferroxcube