The no-load speed of a 240 V Dc shunt motor is 800 r/min and the armature current is 2A. Determine the resistance in series with the field so that the speed of the machine is increased to 950 r/min when the armature current is 30 A. The shunt circuit and armature resistances are 160 ohms and 0.4 ohm respectively. Assume the flux being directly proportional to the field current.

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Electrical Machines Q1

The no-load speed of a 240 V Dc shunt motor is 800 r/min and the armature current
is 2A. Determine the resistance in series with the field so that the speed of the
machine is increased to 950 r/min when the armature current is 30 A. The shunt circuit
and armature resistances are 160 ohms and 0.4 ohm respectively. Assume the flux
being directly proportional to the field current.
Transcribed Image Text:The no-load speed of a 240 V Dc shunt motor is 800 r/min and the armature current is 2A. Determine the resistance in series with the field so that the speed of the machine is increased to 950 r/min when the armature current is 30 A. The shunt circuit and armature resistances are 160 ohms and 0.4 ohm respectively. Assume the flux being directly proportional to the field current.
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