The resistance of the source and inductor are set to 0, this must be a mistake right? I was expecting current to stay constant after the source stops pulsing.

 

If the source impedance is zero it will "enforce" a zero voltage on the inductor.

 

However the system is poorly defined and real world systems just can't do that .

It's probably more helpful to model a resistor and inductor in series.

If the source impedance is zero it will "enforce" a zero voltage on the inductor.

 

However the system is poorly defined and real world systems just can't do that .

It's probably more helpful to model a resistor and inductor in series.

That is very interesting, I would have thought it would inforce the source voltage.

And when the pulse is over, and the source voltage falls to zero, it enforces that too.

And when the pulse is over, and the source voltage falls to zero, it enforces that too.

Wait, what does it inforce when the pulse is high, also 0 volts??

I expect Spice to drift less than that. It has many drawbacks, is useless for general electronics, but at least its algorithm is pretty good.

 

Is there a default value for the series resistance of a voltage source, or the series resistance of an inductor? I don't remember in detail.

 

And what does "1m" mean in the pulse parameters? 1mohm and 1H would drop the current by 10% after 100s just as on the plot.

Edited March 27, 201510 yr by Enthalpy