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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.
To calculate the car's average speed, we don't really care about the fluctuations in its speed. We only care about the total distance traveled by the car and the elapsed time to cover that distance. The formula for average speed is. It's important to note that this formula is identical to that of constant speed.Average speed is measured in units of distance per time. Common units include miles per hour (mph), kilometers per hour (kph), meters per second (m/s), or feet per second (ft/s).As for your brand-new red sports car, your friend was exactly right in his calculation of the average speed.sing the average speed formula, total distance and elapsed time, the average speed for the entire trip can be calculated as, Note that the average speed is not (50+65)/2 = 57.5 mph! Remember that the average speed is defined as total distance traveled divided by elapsed time.