A 420 Vdc, 8 pole Compound DC motor runs at 729 rev/min when drawing a load of 60 A from the supply when meeting a load demand of 28 kW. The compound motor has a Lap connected armature with 816 conductors. The Armature, Interpole, Series, and Shunt resistances are 0.295 Q, 0.0155 Q, 0.00118 Q, and 147 Q respectively. The series field has 6 turns per pole while the shunt field has 2800 turns per pole. Under full load conditions, the shunt current is 3.75 A, and the Friction and windage loss is Pf/w = 0.782 kW. Consider c =6 for lap winding. Assume constant shunt current and friction and windage loss, determine for a reduced output load of 14.5 kW; (a) The new armature current; (b) The new speed of the motor
A 420 Vdc, 8 pole Compound DC motor runs at 729 rev/min when drawing a load of 60 A from the supply when meeting a load demand of 28 kW. The compound motor has a Lap connected armature with 816 conductors. The Armature, Interpole, Series, and Shunt resistances are 0.295 Q, 0.0155 Q, 0.00118 Q, and 147 Q respectively. The series field has 6 turns per pole while the shunt field has 2800 turns per pole. Under full load conditions, the shunt current is 3.75 A, and the Friction and windage loss is Pf/w = 0.782 kW. Consider c =6 for lap winding. Assume constant shunt current and friction and windage loss, determine for a reduced output load of 14.5 kW; (a) The new armature current; (b) The new speed of the motor
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Transcribed Image Text:A 420 Vdc, 8 pole Compound DC motor runs at 729 rev/min when drawing a load of 60 A from the
supply when meeting a load demand of 28 kW. The compound motor has a Lap connected armature
with 816 conductors. The Armature, Interpole, Series, and Shunt resistances are 0.295 Q, 0.0155 Q,
0.00118 Q, and 147 Q respectively. The series field has 6 turns per pole while the shunt field has
2800 turns per pole. Under full load conditions, the shunt current is 3.75 A, and the Friction and
windage loss is Pf/w = 0.782 kW. Consider c =6 for lap winding.
Assume constant shunt current and friction and windage loss, determine for a reduced output load of
14.5 kW;
(a)
The new armature current;
(b)
The new speed of the motor
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