Ones side sends electrons one side receives.
With arc lamps the anode is about 12x as massive to deal with the pounding.
I suspect a similar situation is going on. (I love how the ± are cut into the contacts)
Anyhow it's definitely a fact of life/physics and the field winding doesn't give a crap which way the current flows. It'll make N-S instead of S-N at the field winding but when it's spinning it doesn't matter at all.
–awr–
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