====== FRM20/5/15 ======

|< 100% >|
| //[[user/Stan Zurek]], FRM20/5/15, Encyclopedia Magnetica//, \\ @PAGEL@  |
| //[[/wiki/reviewed]] by [[user/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]].[(Ferro_handbook>Ferroxcube, Soft Ferrites and Accessories, Data Handbook, 2013)]

The numbers refer to the dimensions of the frame, i.e. 20 = 20 mm.

{{page>insert/paypal}}

The core comprises a cuboid [[bar]], which slides into a [[bobbin]]. The outer [[frame core|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 [[bobbin section|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 =====
<box 30% left #f0f0f0>
[[FRM20]] with the [[bar]] inserted into a [[bobbin]]
[[file/frm20_together_magnetica_jpg|{{frm20_together_magnetica.jpg}}]]
{{page>insert/by_SZ}}
</box>

<box 30% left #f0f0f0>
Disassembled FRM20
[[file/frm20_overview_magnetica_jpg|{{frm20_overview_magnetica.jpg}}]]
{{page>insert/by_SZ}}
</box>

===== Core parameters =====
The table below lists the [[core set]] parameters as given by [[Ferroxcube]].[(Ferro_handbook)]

^  Symbol  ^  Parameter  ^  Value  ^
|  Σ(l/A)  |  [[core factor]] (C1)  |  3.29 mm<sup>-1</sup>  |
|  V<sub>e</sub>  |  [[effective volume]]  |  655 mm  |
|  l<sub>e</sub>  |  [[effective length]]  |  46 mm  |
|  A<sub>e</sub>  |  [[effective area]]  |  14 mm<sup>2</sup>  |
|  A<sub>min</sub>  |  [[minimum area]]  |  7.4 mm<sup>2</sup>  |
|  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]].[(Ferro_handbook)]
^  [[Material grade]]  ^  [[AL value]]  ^  [[effective permeability]] μ<sub>e</sub>  ^
|  [[3C90]]  |  500 nH +/- 25%  |  1310  |
|  [[3C91]]  |  600 nH +/- 25%  |  1570  |

===== Data sheets =====
<WRAP 20% left>
Ferrite core FRM20/5/15 Ferroxcube\\ 
[[{{/datasheet/frm20_ferroxcube_datasheet.pdf}}|{{/wiki/datasheet_logo_magnetica.png?100}}]] \\
//<sup>Copyrights (c) Ferroxcube</sup>//
</WRAP>

===== See also =====
  *[[FRM21]]
  *[[FRM24]]
  *[[FRM27]]
  *[[frame core]]
  *[[bar core]]
===== References =====
~~REFNOTES~~

{{tag>Frame_cores Ferrite_cores FRM FRM_cores Counter}}