Question

Why equalizer connection is necessary for armature winding of a dc machine with lap winding?

Answer 1

Equalizer connections are a necessarypart of d-c machine armature windings having more than two circuits. These connections cause substantially equal currents to flow in the circuits of the armature windingresulting in minimum losses, minimum temperature rise, and uniform commutation at each brush arm.

Answer 2

Answer:

To reduce the circulating current, points on the winding which should be at the same potentials are brought to the same potentials by connecting them with conductor. These connections called equalizer connections confine the circulating current to the winding, thus reducing the sparking at the brushes.