The armature resistance of a DC motor whose poles are made of permanent magnets, connected to a DC voltage source with a voltage of Vt= 627 volts, is 2 Ohm and drives a load of 20 Nm. In the meantime, it draws 4 A current from the source. How many rpm is the steady state speed at this load? (magnetic circuit linear- no saturation and armature reaction effects and mechanical losses will be neglected)

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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.