a. Brushes have to shift to new M.N.A position in the direction of rotation of armature.
b. To over come the weakening of the field extra turns have to be added in armature.
c. Pole shoes have to modify at trailing pole tip side to increase the reluctance.
d. Pole shoes have to modify to increase the reluctance.
e. In big machines there is chance of load fluctuation, a compensating winding to be placed at the pole shoes and it is connected in series with the armature winding such that the current in that winding is opposite to the armature winding.
