Relation Between Number of Poles and Speed

Have you looked in CR4 search or Google?

If you had you wouldn't be asking the question.

N = 120f /p whwre N= Speed in RPM, f =Frequency and p = numbe rof pole

Well I not sure you could add more Poles, or if you did, why it wouldn't still rotate 365¼ times per orbit.

A reduction in the number of Poles would speed up the economics of Europe.

Or a reduction in those permitted to use them?

In fact i'm appreciate your answers but i need the physical meaning of the relation

between the no. of poles and speed

Ok if you mean poles in an AC electric motor - the motor poles will be 'synchronous' with the generator pole passes.

Or run "pole for pole" with a 2 pole* generators' shaft speed (*as generators are conceptually simplified as).

If you have 60 Hz then a 2 pole motor will synchronise at 3600 rpm. 50Hz = 3000 rpm.

So if you have 4 poles in the motor - the "pole for pole" takes 2 generator revolutions to provide 4 "pulses", so the motor will run at half generator rpm (1800) (1500).

8 poles = 1/4 - and so on.

In reality, unless the motor is specially designed to be 'synchronous' - there is slip and slip due to load.

So typical rated rpm will be 2800 or 1450 for 50 Hz and whatever

And that's what that math in post #2? was telling you.

Whereas "Pole", being a proper noun, is another topic.

The n poles of a motor are arrayed around a circle, each pole equivalent to 360/n degrees. For each full wave of AC, two poles pass by any point on the circumference (one for the + part of the wave, one for the - part). The rest is just arithmetic: rpm = (120 x Hz)/n_poles.