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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.
If you canât get to a computer or a metronome, the speed of seconds indicates the metronome marking 60. Twice as fast as seconds is 120 and so on. Numeric Tempo Markings: Tempo markings are indicated in beats per minute; that is why 60 BPM is the same speed as seconds. Lower numbers mean the song is sung slower, and higher numbers mean the tempo is faster. When numbers are used to indicate tempo, it will look like the picture to the right. In this case the quarter note gets the beat and the tempo is 120 BPM. So, set your metronome to 120 and every quarter note gets the beat.