Giovanni fcb
giovanni fcb

Synchronous Motor Operation July 26, 2017

When acting as a synchronous electric motor, electric power is supplied to the machine by the application of three-phase alternating voltages to the terminals of the stator windings, in addition to the rotor field windings being fed by a DC voltage source.

Since the voltages applied to the stator windings can be alternated and three-phase, they will travel in them, a three-phase set of alternating currents of the same frequency as the voltage, thus enabling these three-phase currents to generate alternating magnetic fields capable of varying in time.

bell gosset slingle phase

However, through the spatial arrangement found in the stator windings, the time-varying magnetic fields can also cross the stator so that the resulting magnetic field rotates around the circumference of the stator at angular velocity according to the alternating voltage frequency Applied in the windings. The field that circulates around the entire circumference of the stator is also called the rotating field.

Thus, if one of the poles of the constant time magnetic field produced by the rotor field winding communicates with the resulting rotating field of the stator, it will tend to align with the opposite signal pole.

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