I absolutely don't understand it and drives me crazy. I've found several sources, in which there are shown images and animations about how two or three phase electric current generate rotating magnetic field. In all of them the current and the rotating field's frequency are the same. Although everywhere they write that if we have 4 poles than the current frequency is 2 times the rotating field's frequency, and if we have 6 poles than the current frequency is 3 times the rotating field's frequency and so on. Please help me see what I don't see.