A 6 pole dc armature has simplex lap connected 720 conductors, 3 turns per coil and 4 coil sides per slot. Determine the number of slots in the armature and state whether equalizers can be employed or not?

\(\begin{array}{l} No\;of\;turns = \frac{{No\;of\;conductors}}{2} = \frac{{720}}{2} = 360\\ No\;of\;coils = \frac{{360}}{3} = 120 \end{array}\)

No of coil sides = 2 × no of coils = 2 × 120 = 240

No of slots = 240/4 = 60 slots

For employing equaliser ring equipotential pitch value should be integer i.e. 2C/P should be integer.

C = Number of coils

P = Number of poles

\(\frac{{2C}}{P} = \frac{{2 \times 120}}{6} = 40\)

Hence equaliser rings can be employed.