h-tech SSAM (synchronous speed of an AC motor ) Calculator Is the Apps that help to calculate Synchronous AC Motor Speed in RPM. With the data that you entry to this Apps it will calculate the result and you can save it on your spread sheet or some thing else. Feel save here we don't save your data at any media online or off line. .

Synchronous Speed
The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles. This was explained in Chapter 6. Some motors are designed to operate at synchronous speed.

Actual speed of the induction motor will be less than the synchronous speed. The reason for this is if the armature turns exactly at synchronous speed, then the magnetic field of the stator windings no longer cuts the rotor windings. Under this condition, no current would be induced to the rotor windings. With no current flow in the armature, no magnetic field will be developed.

When this happens, there is no longer any torque on the rotor, and its speed drops below the synchronous speed. When the speed is reduced, magnetic flux lines produced by the stator windings again cut the rotor's windings, inducing a current and the resulting magnetic field. Torque is again established.

Actual RPM is approximately 3 to 5% less than synchronous speed. Table 7-1 provides some typical comparative values between the synchronous speed and the actual speed of an induction motor.