010/7/1 al davis <[email protected]>: > On Wednesday 30 June 2010, Josef Vukovic wrote: >> I have a question reagrdig my gnucap simulation of a pure >> inductance. >> >> Here is my gnucap code: >> >> Pure Inductance: >> >> V 1 0 sin(0 220 50) >> L 1 0 100m ic=0V >> >> .print tran v(1) i(L) >> >> .tran .001 .02 >AcXl.dat uic >> .end >> >> >> When I plot the simulated data with gnuplot I get >> a Voltage leading current by 90 degrees, but the >> current is only positive and don't change to negative >> values. How can I simulate a pure inductance with gnucap? > > The results are correct. > > The input starts at zero. For as long as it is positive, > current will rise. When the input goes negative, current will > drop, and continue to drop as long as it is negative. Since the > wave is symmetric, this returns it to zero, so in this case the > current will always be positive. > > You can get negative current with a different starting point. > Try setting ic=-10. Note that for inductors, ic (initial > condition) is current, even if you say "ic=0V". The "V" is > ignored. > > _______________________________________________ > Help-gnucap mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/help-gnucap >
Hm, that's somewhat quiet confusing! Where is the alternating current he sould change his direction :-( but anyway thank you for the explanation. regards _______________________________________________ Help-gnucap mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gnucap
