ULF: A next step for 970 Hz

[DK7FC <selberdenken@posteo.de>]

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