E.g, if a motor is rated at 50Hz, 400V, 22A, 8.29kW, and 1460 rpm, does this means that the motor should be operated from a source voltage of 50Hz, and this corresponds to a synchronous speed of the motor of 1460 rpm?
The reason I ask is because an example question and answer I have seen says the following:
Q: Estimate the number of poles the motor described above has
A: formula for synchronous speed is n=120f/p
closest synchronous speed for given rotor is 1500rpm
I'm guessing the reason they rounded 1460 to 1500 is because the number of poles must be an integer.
So when you see a motor with a speed rating in rpm, what does this value actually mean? And how does this relate to the synchronous speed (like it has in my example question)?