Three Phase Windings

The stator of both the synchronous and asynchronous speed electric motor can be combined with a three-phase winding, which is generally symmetrical where the three are identical with respect to the distribution and the number of turns. The windings are basically composed of turns of magnetic wire wound in a spiral fashion on a ceramic or metallic core or even without a (air) core. The magnetic wire 100bs24 2 7/16 is a copper wire which receives one or more, depending on the type, layers of varnish that makes it electrically insulated, and even if a loop touches the nearby loop there is no electrical contact.

The individual magnetomotive force (fmm) of each winding will thus be offset by 120 electric degrees in space. In addition, the phases will be fed by out-of-phase 120-degree electric currents with equal amplitudes.

The magnetic axes of the windings are offset by 120 degrees electrical in space, where by chance concentrated and full pitch windings in a machine with two poles are shown. It should be noted that analysis remains, however, valid for number of poles greater than two and for distributed windings, provided they are symmetrical.