A Novel DC Inductor Design Method based on Ampere’s Law

Existing equations to calculate the air gap for DC inductor are ambiguous and includes redundant variables. This paper presents a new design method of the DC inductor based the fundamental air gap equation. This later is basically Ampere’s law applied for the design of DC inductor. Furthermore, this paper investigates the inter-reaction between the inductor’s variables such as the number of turns, the core’s cross section and the air gap. The proposed method has several advantages over the existing area product method. First, it gives a good understanding of the interdependence between the inductance variables. Furthermore, the number of turns is calculated before and without the need to know the required magnetic core. Eventually, the filling factor can be accurately determined and finally the optimal is selected accordingly.