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Unformatted text preview: d. An AC (harmonic) analysis
is run to simulate an RL circuit response with an applied excitation of 12 volts at 60 Hz. The complex coil current
is calculated. Figure 206.1 Stranded Coil Problem Sketch Material Properties
µr = 1.0 (coil)
µr = 1.0 (air)
ρ = 3 x 10-8 ohm-m (coil) Geometric Properties
n = 500 turns
s = .02 (coil winding width and
r = (3 x s )/2 m Loading
Vo = 12 volts (static)
V = Vo cos ωt (harmonic)
Vo = 12 volts
ω = 60 Hz ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–468 VM206 Analysis Assumptions and Modeling Notes
Due to symmetry only 1/4 of the problem domain is required. The open boundary is modeled with infinite elements
to accurately represent the decaying field. The infinite element region is set to a depth (6xs) equal to the problem
domain (6xs) for optimal performance.
The coil is characterized through the real constant table. A direct voltage load is applied to the coil region. Nodes
in the coil region are coupled in the CURR degree of freedom to solve for a single valued coil current (per turn).
The coil resistance and inductance are calculated by summing element values in POST1. The real and imaginary
current are extracted from the AC solution. From these calculated currents, and the applied voltage, the coil
impedance can be calculated. Results Comparison
Inductance, H .01274 .01275 1.00 3.534 3.534 1.00 Coil current, Amps
Harmonic Analysis Ratio Resistance, Ohm Static Analysis ANSYS 3.3...
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