In A.C. series motor compensating winding is employed to
A. reduce the effects of armature reaction
B. increase the torque
C. reduce sparking at the brushes
D. none of the above
Answer: Option C
Solution(By Examveda Team)
In A.C. series motors, compensating winding is used to reduce sparking at the brushes.When a series motor operates, the armature current and field winding current are in series. This leads to a higher chance of sparking at the brushes due to the commutation process. The compensating winding is placed in the pole faces of the motor and produces a magnetic field opposite to that produced by the armature current during commutation. This counteracts the armature reaction, reducing sparking at the brushes.
Therefore, option C is the correct choice.
This Question Belongs to Electrical Engineering >> Single Phase Induction Motors
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Compensation winding is used to produce an equal and opposite magnetizing action to the armature's cross magnetizing effect. So it has nothing to do with brush sparking, rather non-inductive high resistance leads are used to connect short-circuited windings to commutator segments to deal with brush sparking. So I think the answer is A.