Synchronous Speed

The speed of rotation of the magnetic flux produced by linking the primary winding. An AC induction motor is designed with a certain number of poles that determine its speed when connected to power of a specific frequency. For example, a four-pole motor run on 60-hertz power has a synchronous speed of 1800 RPM. In actual use, the motor will run at a slightly lower speed, typically around 1725 RPM, due to the slip characteristic of the motor.