i am having a hard time understanding why do we place the brushes on the Magnetic neutral axis, the textbook simply says, because this is where the current reversal takes place, is the point where emf from different meet is the same as the point of current reversal?
Electrical – position of brushes on the commutator in a dc generator
dcgenerator
Best Answer
Current reversal means the current is 0. It is desirable to commute here because 0 current means no arching. The increases the life of the brushes and commutator segments. This can be done by rotating the brush card or using compensation windings.