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Synchronous Speed When Alternating current (AC) is applied to the stator of a three phase motor, a rotating magnetic field is setup. This rotating magnetic field moves with a speed called synchronous speed. The Synchronous speed can be calculated as follows: 120 times the frequency (F), divided by the number of poles (P): The synchronous speed decreases as the number of poles increases. The table below shows the synchronous speed associated with various numbers of poles at supply frequencies of 50Hz and 60Hz: Rated Speed. The speed of operation of an AC motor when fully loaded at rated voltage is called the rated speed.
The relationship for speed is the same for any units, as long as the units are consistent. If a car traveled 30 miles in an hour, the speed would be 30 miles per hour. If an object is moving at varying speeds, then the relationship between speed, distance and time can only be used to calculate the average speed. A distance-time graph, which shows the speed varying as the time increases, is a good way to see how the speed of an object changes. The relationship between speed, distance and time can be used to calculate any of the three variables, as long as the other two are known. The time taken for a journey, for example, is equal to the distance divided by the speed. Distance traveled can be calculated by multiplying speed and time together.