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magnet wire / winding wire engineering data Round Wire For round conductor, where the cross-sectional area may be more Circular Mil Area = D 2 conveniently expressed in Circular Mils, the following formulas are Square Mil Area = /4 D 2 = 0.7854 D D 2 useful: Square Inch Area = 0.7854 x 10-6 2 General Formula: Lbs./1000 Ft. = 0.00034047 (d) (D 2)
Half-Size Copper Magnet Wire Dimensional Values Derived from NEMA MW1000-2020 Standard SIZE DIAMETER (AWG) BARE COPPER (INCHES) RESISTANCE** (OHMS PER 1000 FT. AT 20˚C) FEET PER POUND POUNDS PER 1000 FT. CIRCULAR MILS MIN. NOM. MAX. MIN. NOM. MAX. NOMINAL 10 1/2 11 1/2 12 1/2 13 1/2 14 1/2.0952.0847.0755.0672.0599.0962.0856.0763.0679.0605.0971
The Sumitomo Electric magnet wire technical guide provides comprehensive information on the properties, applications, and specifications of various magnet wires.
Annex C provides a cross reference between NEMA and IEC magnet wire specifications. Annex D provides the formulas for determining dimensional requirements of round film-insulated magnet wire and dielectric breakdown, as well as cross-sectional area and resistance calculations.
Engineering data for copper magnet wire, based on NEMA / metric Area Recom. Typical Increase Increase kg/km m/kg ohms/kg wires / ohms / Winding Elon-(mm) (mm) (sq. mm) sq. cm cm 3 Tension gation AWG Min Nom Max Min Nom Max * Min Min Nom Max Min Min Nom Max Nom Nom Nom Nom Nom Nom (gram) % AWG 24,0 0,505 0,511 0,513 0,0818 0,0838 0,0859 0,025 0,531 0,541 0,551 0,048 0,554 0,565 0,577 0,204666 ...
Magnet Wire / Winding Wire Nominal Bare Wire Diameters — Whole AWG Size Whole AWG Size Diameter Inches Diameter mm Weight Lbs./1,000ft Resistance at 20°C Ohms/1,000ft 23 0.0226 0.574 1.546 20.31 24 0.0201 0.511 1.223 25.67 25 0.0179 0.455 0.9698 32.37 26 0.0159 0.404 0.7652 41.02
Typically a wire tension of 60 - 80% of the maximum recommended tension is used, to ensure that the magnet wire is not elongated and damaged during the winding process. AWG - METRIC - INCH equivalent dimensions
