23-10-2021, 12:37 PM
I have suffered broken solid copper wires to field coils but in slightly larger Riley dynamos. Vibration - copper work hardens - breaks. I have used multi strand cable soldered each end onto the connection points. Multi strand is a bit more flexible and less likely to fracture. Suspect some of problem has been due to field coils and their wrapping insulation compacting slightly so that the coils were able to move and vibrate slightly. The coils were also removed an extra wrapping applied.
Dennis
Dennis