A 300V DC motor is running at 1600rpm taking a current of 40A. The armature reisistance is 0.5Ω. Due  to a change in the magnetic field, the flux in the machine is reduced to 80% of the original value.  Calculate the new speed of the motor due to this flux weakening. Also, calculate original torque and  torque due to flux weakening.

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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.