Hi again. New update for the auxillary transformer
There is some wrong calculations in the previous update. I think I was too tired last night
Today I recalculated and found the following:
For the 23VA. Continuously load at 42V. Using an estimated Power factor of 0,9 → 20,7W resistive load.
I = 0,548A → resistive load = 76,64 / 0,9 = 85,15 Ohm continus Load.
I found some elements from an old micro oven, and an old
resistor form a
car fan control.
When connecting them in series, I got 85 Ohm, which is more than close enough to 85,15 Ohm, for testing the
voltage under continius load.
Here are the results I calculated to be the number of windings and the voltages mesured after rewinding the transformer again.For 220V and 380V setup (original)Primary windings: 5,773 windings/Volt
Brown -Red. 0 → 220V. → 1 270 Wingdings.
Orange –
red. 160V. → 924 windings. From 220V to 380V.
Brown - Orange. 0 → 380V. → 2 194 windings total.
Open
circuit voltages measured:
17,46V and 45V. (Secondary side voltages).
With Load.42V and 16,89V
For 230V and 400V setup Primary windings: 5,773 windings/Volt.
Brown -Red. 0 → 230V. → 1 327 windings.
Orange – red. 170V. → 981 windings. From 230V to 400V.
Brown - Orange. 0 → 400V. → 2 308 windings total.
Open circuit voltages measured:
45V and 17,46V. (Secondary side voltages).
With Load.42V and 16,89V
I think this is as close to perfect as possible to obtain!
PS: I will be back with more updates, when this is installed and the welder is working again.
For ÅkeB.
Here is a picture of how I did the winding set-up with a small leith. This is what you were asking for?
Mark! When taking apart the transformer, there is wan plastic ledge covering a little bit of the primary windings.
To be able to rewind the transformer primary, this ledge has to be removed.
I just used a knife and carefully cut it off, without damaging the wall separating primary and sekondary windings.