When acting as a synchronous electric motor, the electric power is supplied to the machine by means of the application of three-phase alternating voltages at the terminals of the stator windings, considering that the rotor field windings are fed by a DC voltage source.
Considering that the voltages applied to the stator windings are alternating and three-phase, a three-phase array of alternating currents with the same frequency as the voltage can be traversed in them, causing these three-phase currents to produce alternating magnetic fields capable of varying in time.
Apart from this, through the spatial arrangement of the windings in the stator NM3455 25HP, these time-varying magnetic fields can also roam the stator so that the resulting magnetic field rotates around the circumference of the stator with proportional angular velocity according to the alternating voltage frequency Applied in the windings.
This field that runs around the circumference of the stator is also called the rotating field. Thus, once one of the poles of the magnetic field constant in time produced by the field winding of the rotor interacts with the rotating field resulting from the stator, it will align with the opposite pole.