Comparing with the relationship bet

Comparing with the relationship between the rotor speed and the frequency of the induced emf in a three phase winding derived earlier, we can find that the rotor speed equals the rotating field speed for a given frequency. In other words, the rotor and the rotating field are rotating at a same speed. We call this speed synchronous speed, and use specific symbols wsyn (mechanical rad/s) and nsyn (rev/min) to indicate it.