Unless the winding factor is exactly one of the values listed, interpolate to find the MLT. On the data page for the core selected, consult the Winding Turn Length chart. On the wire table look up resistance per unit of length for the gauge selected. Calculation MethodĬalculate the winding factor for the core, wire gauge, and number of turns selected. Then,Įven easier, Magnetics has calculated the single layer DCR for a range of wire gauges for each core size. MLT data can be found on each core data page. The mean length of turn (MLT) is simply the length of any turn along the surface of the core. MLT (Mean Length Turn) DCR CalculationĬalculating nominal DC Resistance for a single layer winding is straightforward. This permits an estimate of actual length/turn for any winding factor. Winding turn lengths have been computed for each core size, using empirical relationships, for ten winding factors. High fill: Winding factors up to about 65% are achievable, but generally only with special expensive measures, such as completing each coil by hand after the residual hole becomes too small to fit the winding shuttle.
#Coil winding calculator ferrite core inductor full
Full winding: factors between 30% and 45% are normally a reasonable trade off between fully utilizing the space available for a given core size, while avoiding excessive manufacturing cost.Low fill: For manufacturing ease and reduced capacitance, winding factor between single layer and 30% may be used.Disadvantages are reduced power handling and higher flux leakage. Advantages are lower winding capacitance, more repeatable parasitics, good cooling, and low cost. Single layer: The number of turns is limited by the inside circumference of the core divided by the wire diameter.In practice, several approaches to toroid winding are used: Toroid Core Winding factors can vary from 20-60%, a typical value in many applications being 35-40%. In other words, in a toroid, winding factor is given by: Winding factor, also called fill factor, is the ratio of total conductor cross section (usually copper cross section) to the area of the core window.
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