2. Model Construction and Analysis
This will take you through a stepbystep process to analyze the magnetic field of an aircored solenoid sitting in open space. The coil to be analyzed is pictured in Figure 1. The coil has an inner diameter of 1 inch; an outer diameter of 3 inches; and an axial length of 2 inches. The coil is built out of 1000 turns of 18 AWG copper wire. For the purposes of this example, we will consider the case in which a steady current of 1 Amp is flowing through the wire.
In FEMM, one models a slice of the axisymmetric problem. By convention, the r=0 axis is understood to run vertically, and the problem domain is restricted to the region where r≥0. In this convention, positivevalued currents flow in the intothepage direction.