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Date: Mon, 13 Nov 2017 16:03:52 +0100
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Subject: ULF: A next step for 970 Hz
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Today i searched for suitable materials to build a iron band rod for a 
coil for 970 Hz.
I learned about kornorientiertes Elektroblech, 
https://de.wikipedia.org/wiki/Elektroblech or 
https://en.wikipedia.org/wiki/Electrical_steel
A normal 50 Hz transformer is using 0.5 mm plates. For higher 
frequencies there are thinner plates available.
I searched for a local company and quickly found this product catalogue:
http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf

Excellent! They offer 0.23 mm think plates.
Then i sent them an email request and later i had a telephone talk with 
the chief of the company. I asked if they have maybe even better 
materials and he said yes, they have a band of the type H075/18/20. This 
is a band which has a thickness of just *0.18 mm* and it is 20 mm width. 
Since it is grain-oriented it matters how the B field passes through it.
He said that this special band is worse at 50 Hz but can be used to up 
to 4 kHz!!!!!!!!!!!!!!!!!!!!!!!!!!! So maybe this opens the frequency 
range from 4 kHz down to the lower ULF!!!! :-)

I got a good price, just 4 EUR for 1 kg but i have to order at least for 
100 EUR so i will order 25 kg of that stuff! Already done!

My idea is to build a 0.5 m long rod. One piece of the band will then 
have a cross section area of  3.6 mm^2. I will need about 1000 to 1500 
of these bands in parallel. This should fit into a PVC tube with an 
outher diameter of 80 mm. Very handy!

I'll keep you informed ;-)

73, Stefan

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Today i searched for suitable materials to build a iron band rod for a
coil for 970 Hz. <br>
I learned about kornorientiertes Elektroblech,
<a class="moz-txt-link-freetext" href="https://de.wikipedia.org/wiki/Elektroblech">https://de.wikipedia.org/wiki/Elektroblech</a> or
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Electrical_steel">https://en.wikipedia.org/wiki/Electrical_steel</a><br>
A normal 50 Hz transformer is using 0.5 mm plates. For higher
frequencies there are thinner plates available.<br>
I searched for a local company and quickly found this product catalogue:<br>
<a class="moz-txt-link-freetext" href="http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf">http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf</a><br>
<br>
Excellent! They offer 0.23 mm think plates. <br>
Then i sent them an email request and later i had a telephone talk with
the chief of the company. I asked if they have maybe even better
materials and he said yes, they have a band of the type H075/18/20.
This is a band which has a thickness of just <b>0.18 mm</b> and it is
20 mm width. Since it is grain-oriented it matters how the B field
passes through it. <br>
He said that this special band is worse at 50 Hz but can be used to up
to 4 kHz!!!!!!!!!!!!!!!!!!!!!!!!!!! So maybe this opens the frequency
range from 4 kHz down to the lower ULF!!!! :-)<br>
<br>
I got a good price, just 4 EUR for 1 kg but i have to order at least
for 100 EUR so i will order 25 kg of that stuff! Already done!<br>
<br>
My idea is to build a 0.5 m long rod. One piece of the band will then
have a cross section area of  3.6 mm^2. I will need about 1000 to 1500
of these bands in parallel. This should fit into a PVC tube with an
outher diameter of 80 mm. Very handy!<br>
<br>
I'll keep you informed ;-)<br>
<br>
73, Stefan<br>
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