A 200 kW, 400 V, six pole, separátel pm, an armature winding resistance of 0.05 2, a field w and a rated field voltage of 200 V. The armature windin connected in a lap winding.
A 200 kW, 400 V, six pole, separátel pm, an armature winding resistance of 0.05 2, a field w and a rated field voltage of 200 V. The armature windin connected in a lap winding.
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:QUESTION THREE
A 200 kW, 400 V, six pole, separately-excited DC machine has a rated speed of 500
pm, an armature winding resistance of 0.05 2, a field winding resistance of 20 2,
and a rated field voltage of 200 V. The armature winding consists of 2000 conductors
connected in a lap winding.
(a) Sketch the equivalent circuit of the separately-excited DC machine operating as a
generator.
(b) Calculate the armature constant of the machine.
(c) Calculate the useful flux per-pole when the generator runs at rated speed, on no-
load, with the armature terminal voltage equal to rated voltage.
(d) Calculate the armature terminal voltage when the generator is on load supplying
rated power.
(e) Calculate the efficiency of the generator when it supplies full-load. The friction
and windage losses, the core losses and the stray losses add up to 5 kW.
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