This preview shows page 1. Sign up to view the full content.
Unformatted text preview: . Since the field is symmetric around the circumference, only a 5° slice is chosen for modeling. The
external air is modeled to a boundary at r1= 0.75 in, where the infinite boundary element is placed.
Six elements are arbitrarily modeled through the conductor thickness, line segment divisions and spacing ratios
for the inner and outer air regions are chosen to provide compatible element sizes with the steel elements. The
solution procedure consists of ramping the boundary conditions over 5 iterations in the first load step and iterating to convergence in a second load step with a convergence criterion of 1 x 10.
The MKS system of units is used for the analysis. The conversion factor used in the KPSCALE command, from
inches to meters is 0.0254. The current density is calculated as J = I/A = I/π(ro2 - ri2) = 2.28019 x 10-4 A/in2 = 438559
A/m2. Results Comparison
Target ANSYS Ratio Bangle, T @ r r=.325 in 0.48 0.45 0.94 Bangle, T @ r=.375 in 1.03 1.02 0.99 Bangle, T @ r=.425 in 1.22 1.21 1.00 Figure 165.2 B-H Curve 1–366 ANS...
View Full Document
- Spring '09
- The Land