The speed of a 37.3 kW series motor working on 500 supply is 750 rpm at full-load and 90 percent efficiency. If the load torque is made 350 N.m and a 5 ohm resistance is connected in series with the machine, calculate the speed at which the machine will rum. Assume the magnetic circuit to be unsaturated and the armature and field resistance to be 0.5 ohm.

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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.