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Just to clarify, the motor windings will see the same current, if you have 100 amps going through two fields in series, or 200 amps split between two 100 amp fields in parallel, sameo-sameo as far as the motor is concerned. The supply will see higher currents, but not really within the motor itself, since you were focused on the motor heat issue. Same is true for proper rewinding for lower or higher voltage, in that the power stays the same.
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Ok, that makes sense, since it all comes down to current flowing through a coil.
Could you clarify this issue?
This may be more of a control issue, but I've heard that the circulating currents in a delta wound motors can be an issue. It's pretty clear how things work in a wye motor, but how can imbalances be controlled in a delta motor? For example, the impedance through every coil may be the same, but the momentary BEMF could be different, resulting in circulating currents that don't provide any torque.
Thanks,
E*clipse