Ferrite materials (was Re: A CW TC without a tube + Re: Solid state TC progress ?)

• To: tesla-at-pupman-dot-com
• Subject: Ferrite materials (was Re: A CW TC without a tube + Re: Solid state TC progress ?)
• From: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 11 May 1999 08:19:06 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List <tesla-at-pupman-dot-com> on 10.05.99 07:46:12

To:   tesla-at-pupman-dot-com
cc:    (bcc: Marco Denicolai/MARTIS)
Subject:  Re: A CW TC without a tube + Re: Solid state TC progress ?




Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>

>> I received today a sample of a Siemens U93/76/30 core (U-U couple): that
>is the
>> biggest from Siemens! The problem is that the material is N27, which has
>> reasonable losses up to 25 kHz (I use 50 kHz). Boy, that has got a Ve of
>297000
>> mm3 and an Ae of 840 mm2! Great size but not optimal material...

>N27 is a great choice for your application IMO. (Philips equiv. 3C85)

Not really. Here is a sample from Siemens and Philips databooks:

f    B    3C90 loss N27 loss
kHz  mT   kW/m3          kW/m3
25   100  12        30
25   200  80        155
100  100  80        200

3C90 is slightly better than 3C85 and it is what I have ordered. As you can
see,
over 25 kHz the N27 losses rocket to sky. Already at 25 kHz they are twice what
I get with the 3C90.

Cheers

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