Borislav,

You also mentioned using 12 kilogauss might be to small and the wire takes up the entire core. That very well could be and welcome to the world of transformer design. Even though the math is correct, we have to select several different core sizes sometimes to get the right one. However, that one has been chosen before for a certain amount of wattage. You may try raising the flux density to 13,000 or 13,500 gauss as this is within M-19 or M-22. M-6 you could use up to 15 kilogauss. However, since we dont know what the material is, I'd start with the lower values. As a rule of thumb, 12 kilogauss is used for any unknown steel lams that will be encountered. It takes into consideration plain cold rolled steel. If I recall, appliance transformers and motors use something like M-50 which is about as low as you can go. That would have the lowest maximum flux density too. I highly doubt it being on the higher end like M-6 over the cost. M-6 is only used for top end transformers which need a high efficiency. The power companies use this in the pole pigs, some high end electronics equipment, and some amateur radio transformers (Hipersil). Hope this helps but Transformer desin is sort of a cut and try process.

Best,

Will



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