I looked for some explanations online but I honestly dont understand anything at all 🙁
In: Engineering
It is important to note that motors (and generators) operate by the interaction of two magnetic fields, one stationary and one rotating. Which is which is a matter of design.
In a typical synchronous machine the stationary field is on the rotor and the rotating field is on the stator. Rotor and stator are terms that refer to their mechanical positions, not their electromagnetic properties. An AC three phase winding does a good job generating a rotating magnetic field so that all the stationary field has to do is follow it around in lock step, which is the definition of a synchronous machine.
The speed of a synchronous machine is governed by only 2 things, number of pole pairs and frequency of the AC supply. RPM equals frequency times 60 divided by the number of pole pairs. The 60 is to compensate for RPM being in minutes and frequency in seconds. And since pole pairs is so uncommon, it is usually termed RPM=frequency x 120 / poles.
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