IEC 63182-2:2020 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ring-cores (also called toroids) made of magnetic powder, the effective parameter values to be used in calculations involving them, and gives guidelines on allowable limits of surface irregularities applicable to coated ring-cores.
IEC 63182-2 Ed. 1.0 b:2020
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Magnetic powder cores – Guidelines on dimensions and the limits of surface irregularities – Part 2: Ring-cores
International Electrotechnical Commission , 09/29/2020
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