VM207
VM207
Stranded Coil Excited by External Circuit
Test Case
A stranded coil with 500 turns and a fill factor of 0.9 is connected
to an external circuit consisting of an independent voltage source
and a 2 ohm resistor. A static analysis is run with a 12 volt DC
excitation to determine the coil resistance and inductance. A transient
analysis is run to calculate the coil current response to a step 12
volt excitation.
Analysis Assumptions and Modeling Notes
The problem is similar to VM206 except the coil is excited by an
external circuit using the general circuit element. In the circuit, the coil is modeled by a
stranded coil circuit component that shares a common node with the coil in the finite element
model. The finite element model provides to the circuit the necessary coil resistance and
inductance to characterize the stranded coil circuit impedance. The nodes in the coil region are
coupled in the EMF and VOLT degrees of freedom so that a single voltage drop (EMF) and coil
current (CURR) are calculated.
A static analysis is run to obtain the coil resistance and inductance
so that an analytical solution of the transient response can be calculated
and compared to the solution results. A transient solution to a step
voltage excitation is run for 0.01 seconds. The calculated coil current
is compared to the solution current. The coil current response is
plotted versus time.
