Rotating field of a distributed symmetrical 3-phase winding: polygon of Görges
Animation is based on chapter 3 (p97) of the book Electrical Machines and Drives by Jan A. Melkebeek (ISBN 978-3-319-72729-5).
The jumps of the mmf curve at each slot k correspond to the Dirac Delta functions for the ampere-turns in the slot k.
Please note that the fundamental mmf waveform is not to scale!