To have sparkless commutation, the armature reaction effect in a DC a machine is neutralized by
A. compensating winding and commutating poles.
B. shifting the brush axis from geometrical neutral axis to magnetic neutral axis.
C. fixing the brush axis in line with the pole axis.
D. increasing the field excitation.
Answer:A
To have sparkless commutation, the armature reaction effect in a DC a machine is neutralized by
A. compensating winding and commutating poles. B. shifting the brush axis from geometrical neutral axis to magnetic neutral axis. C. fixing the brush axis in line with the pole axis. D. increasing the field excitation.