Figure 4.361 SOURC36 Current Source Element
TYPE
Source type  use 1 for Coil, 2 for Bar, 3 for Arc.
CUR
Total current flowing through source (i.e., number of turns times current per turn).
DY
Characteristic y dimension for source type.
DZ
Characteristic z dimension for source type.
EPS
Convergence criterion for source field (Hs) calculations for arc and coils. Defaults to 0.001. EPS represents the relative maximum difference in the field Hs calculated at any node during the iterative calculation of the source field. EPS does not apply for bar sources.
Characteristic dimensions described above are in the element coordinate system. In the case of circular sources (coils, arcs) the radius is determined from the first and third nodes (I,K). For bar sources, the length is determined from the first two nodes (I,J).
A summary of the element input is given in Table 4.361. A general description of element input is given in Section 2.1.
Table 4.361 SOURC36 Input Summary
Element Name

SOURC36

Nodes

I, J, K (nodes I, J and K define the characteristic length, current
flow direction, and orient the source)

Degrees of Freedom

None

Real Constants

TYPE, CUR, DY, DZ, (Blank), (Blank), (Blank), (Blank), EPS

Material Properties

None

Surface Loads

None

Body Loads

None

The EPS convergence criterion is a measure of the relative difference in the calculated H_{s} field used during an iterative numerical integration procedure for coil and arc source primitives. The default value (.001) provides for good accuracy in regions outside of the source primitive location. For highly accurate calculations within the source primitive domain, the criteria may have to be tightened (i.e., a factor of 20 increase would be represented by EPS=.00005). Tightening the convergence criteria will significantly increase the solution run time. Users concerned with accurate calculations within the coil and arc source primitive domain should experiment with the criteria until satisfied with the degree of accuracy obtained.
All currents for a magnetostatic model employing the scalar potential formulation must be specified. Whereas symmetry conditions on the finite element model may be employed, no symmetry may be employed on the current source elements.