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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Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.