I don't get your point. Was your comment intended to help the OP?The member asked a very simple question, that is, how would you alter the winding data to change a coil's rated voltage from 120 to 240. Whether it's worth the time and trouble to actually do it should maybe left up to him. Maybe he has all the time and patience in the world. Maybe he just enjoy's working with his hands. Good grief! Maybe he doesn't even plan on actually doing it, but wanted to know what would be involved.
In my trade we often deal with contactors,coils, etc. It is quite common for a coil to be rated as dual voltage, and have 4 terminals. Each dual voltage coil has 2 identical windings which can be connected in parallel for the low voltage(120 for example), or in series for high voltage(240). The iron is equally saturated in either case, since the ampere*turns remains the same. This is my reasoning.Simple, measure the impedance and current draw at 120V then duplicate it for 240V.
There's no way you can can count the original windings and AWG of the wire then come up with what you'll have to replace it with unless you go through a lot of formulas. If there's room go down by 2 - 3 AWG gauges and wind around 50% more turns on the form as a starting point. Measure everything again and you might be good to go.
How would you do it, considering the laws of inductance and core permeability?
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by Luke James