1 3 1 4 and 1 5 t core loss in all the cores tested at 60 hz was at 0 14 0 17 0 20 0 24 0 28 and 0 33 w kg respectively in addition to the above mentioned detrimental effects caused by gluing the core edges by epoxy resin gluing required a resin curing process which was performed at an elevated temperature of about 150 u00b0 c for about 2 hours with a cooling time of about 1 5 hours this resin curing process was eliminated by adopting the present invention reducing the core production time and cost considerably furthermore the epoxy gluing process of core edges is difficult to be automated whereas the tape wrapping process of the cores of the present invention is easily automated magnetic cores based on commercially available amorphous alloy metglas u00ae 2605sa1 were tested for their audible noise at a different operating frequency the test results are summarized in table iii where audible noise are compared among differently prepared magnetic cores excited at induction levels 1 0 1 50 t at 50 hz sound power emanating from taped epoxy coated glued and bare cores it is noted that noise levels on taped cores were only slightly higher than those from a bare core which was neither epoxy coated nor taped on the other hand the glued core emanated significantly higher noise compared to the taped cores by about 9 db above 1 3 t excitation which is.