Question

Question :. A 22.38 kW, 440-V, 4-pole wave-wound d.c, shunt motor has 840 armature conductors and 140 commutator segments. Its full-load efficiency is 88% and the shunt field current is 1.8 A. If brushes are shifted backward through 1.5 segments from the geometrical neutral axis, find the demagnetising and distorting amp-turns/pole. (Elect. Engg. Punjab Univ. 1991) Condo​

Answer 1

$22.38 \times \frac{140}{1.8}$