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You are Correct that their is only one field coil. So it's not possible that the high speed coil would burn out because it's all the same one. If any part of the coil is damaged or defective the whole thing is bad. The switch chaged back and forth from using the entire field coil to using only half or a percentage of it for low speed. This is because leads are brough out from the center(ish) of the coil windings. By using only the half the magnetic field acting on the armature is weeker therefore spinning the armature at a lower speed. The voltage does not change on either speed. However current consumption does. Lower speed doesn't pull as many amps as high speed.
You are
Correct that their is only one field coil. So it's not possible that the high speed coil would burn out because it's all the same one. If any part of the coil is damaged or defective the whole thing is bad. The switch chaged back and forth from using the entire field coil to using only half or a percentage of it for low speed. This is because leads are brough out from the center(ish) of the coil windings. By using only the half the magnetic field acting on the armature is weeker therefore spinning the armature at a lower speed. The voltage does not change on either speed. However current consumption does. Lower speed doesn't pull as many amps as high speed.
