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ULF: A next step for 970 Hz

To: [email protected]
Subject: ULF: A next step for 970 Hz
From: DK7FC <[email protected]>
Date: Mon, 13 Nov 2017 16:03:52 +0100
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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, or
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:

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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