You are confusing windings with motor inputs. They are not the same. So this quote:
"So in both cases, the voltage and the amperage ends up being exactly the same in the windings of the motor and the I2R loses are exactly the same."
The key word is windings, I didn't say motor inputs. The individual windings within the motor will have the same voltage and current but the motor inputs will be different. A dual voltage motor splits the pole windings so they can be fed differently. You said it yourself in this statement:
czechmate wrote:Obviously, the motor connection inside the each motor packerhead will have to be reconnected according to the wiring diagram. For 110V windings are parallel, for 230V they are in series to add resistance for higher voltage. If you forget this part, you will burn the windings in no time!
I completely agree with this statement. However, when you have two windings in series and apply 230v across them, each individual winding will have 115v across it (115v + 115v = 230v) and the same current through it because they are in series. When you put those same two windings in parallel and put 115v across them, both windings will EACH have the same current as in the 230v case because the voltage is the same across each individual winding. However, the TOTAL current in the 115v case will be twice that as in the 230v case because it is fed with two windings in parallel.
If the windings are the same, then the complex impedance will be the same. The voltage across each winding segment is the same because of the series connection at 230v vs the parallel connection at 115v. So by Ohms law, the currents will be the same in each individual winding. But because the 115v case has two windings in parallel, current adds at connection nodes so the input to the motor will have twice the current as the 230v case.
So using ohms law (Generalized for winding impedance Z)
In the series case:
Is = Vs / (Z + Z) = Vs / 2Z where Vs = 230v rms
In the parallel case:
Ip = Vp / Z + Vp / Z = 2Vp / Z where Vp = 115v rms
So â€œIpâ€ is twice â€œIsâ€ but the current in each segment of the winding, â€œIwâ€, is the same.
Iw = Vp / Z = Vs / 2Z = Is
czechmate wrote:Obviously, it takes some people longer to understand Ohms law.
Licence does not mean a thing.
There is also lot of drivers out there with a driver license, that can not park in parallel.
Have a nice day.
Then why did you bring up your experience in the first place if it doesn't matter?
On #1 & #2, because you have 230v across two windings in series, if you measure the voltage across a single winding, it will be 115v. I never meant to imply that 115v was â€œappliedâ€ to each winding in the high voltage case only that there is 115v volts across each winding because they are in series.
As for #3, in a two pole split phase motor you must have at least four windings, one for each pole in the main windings and one for each pole in the starter winding. These windings are usually connected in series for the two poles of a 230v motor so they appear as two windings when in fact they are four winding fed in series pairs. With dual voltage, you have to be able to configure the windings in series for 230v and parallel for 115v volts. So the series connection between the poles is separated into two windings so they can be fed in parallel for 115v. This is why the motor needs to be reconfigured with jumpers when powered with different voltages.This
link and this
link might be usedful as it illustrates how the windings are connected.