Imphy Alloys

Centre National De La Recherche Scientifique

Ecole Normale Superieure De Cachan

Aperam Alloys Imphy

Fabien Simon

Thierry Waeckerle

Thierry Save

Alain Demier

Francisco Alves

A nanocrystallised tape-wound core without a localised airgap, consisting of a nanocrystalline material with the following atomic composition: [FeNi]100-x-y-z-a-&#x3b2;-&#x3b3;CuSiBNbM'M&#x2033;, wherein a&#x2266;0.3, 0.6&#x2266;x&#x2266;1.5, 10&#x2266;y&#x2266;17, 5&#x2266;z&#x2266;14, 2&#x2266;a&#x2266;6, &#x3b2;&#x2266;7, &#x3b3;&#x2266;8, M&#x2032; is at least one of the elements V, Cr, Al and Zn, M&#x2033; is at least one of the elements C, Ge, P, Ga, Sb, In and Be, with a permeability &#x3bc; of 200 to 4000, a saturation of more than 1T, an induction range, in which the permeability does not vary by more than 5%, of more than 0.9T, a remanent induction of less than 0.02T and a cut-off frequency higher than 1 MHz, such that &#x3bc; varies by less than 1% when the core is aged for 100h at more than 100&#xb0; C., &#x3bc; varies by less than 5% when the core is coated, &#x3bc; varies by less than 15% when the temperature is in the range of &#x2212;25&#xb0; C. and +60&#xb0; C., and by less than 25% when the temperature is in the range of &#x2212;40&#xb0; C. and +120&#xb0; C., and &#x3bc; varies in a monotonic and substantially linear manner with a temperature of &#x2212;40&#xb0; C. to +120&#xb0; C.

Nanocrystalline core for a current sensor, single and double-stage energy meters and current probes containing them

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Crosne, France

Fabien Simon