when the salient poles of a three phase synchrounous motor are supplied with DC excitation, how does this create a north and south pole? all i can think of is the positive will create a north pole and the negative will create the south pole but what is the construction of the coils to create this affect without cancelling each other out?

Also what affects does synchrounous reactance have on the performance of the motor?

 

The poles are wound "interleaved", first pole is wound clockwise, 2nd is wound counterclockwise, 3rd is clockwise, etc.

From the right hand rule, the poles when energized will be N,S,N,S, etc...

 

If DC excitation was replaced with a three phase rotating magnetic field on the rotor would it chase the stationary rotating magnetic field at synchrounous speed ?