You are still struggling with a complicated
transformer. Start with a simple winding with just one tap, with
the mains supply across the whole winding, and no separate
'secondary' winding. When you get that simple version to work,
then expand. Nothing should ever 'blow up' in such circuits.
On 2024-12-27 00:10, Bell, Dave via
groups.io wrote:
I later extended the TRAN to over 1 second,
then starting data at 1s.
The currents definitely took 6-8 cycles to
settle down, but voltages were essentially the same.
“But there is zero
coupling between L6 and any of L2, L3, and L4. That is not
physically possible! This might be why it "blows up".”
I tried both K directives, one separate for
just L1 & L6, and all (L1..4 & L6) in one line.
There was a small difference in L6 voltage,
but similar issues with infinities with small loads.
Dave
Several more things to note:
It is never a good idea to simulate for
only 1/2 of a cycle, or even 1 cycle -
especially
when inductors are involved! A far better thing to do is to
simulate for 10s to 1000s of cycles (or more), and then
apply your .MEAS commands to only the last cycle. e.g., you
might use ".tran 0 10 9.98" or similar.
Because you extracted their amplitudes at
only one specific point in time, I strongly recommend
disabling waveform compression. With waveform compression
enabled, the saved points miss the peaks entirely, and now
your measurements depend on interpolation. It's far better
to use ".MEAS ... RMS" over a full cycle, instead of ".MEAS
... AT".
By using "AT", you also introduced errors
due to phase shift. With both resistances and inductances,
there is phase shift.
You constructed a physically impossible
magnetic circuit. You have L1 and L6 tightly coupled, and
L1 is tightly coupled to each of L2, L3, and L4. But there
is
zero
coupling between L6 and any of L2, L3, and L4. That is not
physically possible! This might be why it "blows up".
--
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying
John Woodgate
