Subject

2 pole motors = 3600 RPM
4 Pole motors = 1800 RPM
6 Pole motors = 1200 RPM
8 Pole motors = 900 RPM

The above are synchronous RPMs.

Induction motors require some "slip" to develop torque thus ave values
are as follows:

3450, 1725, 1150, and about 825 RPM.

Lew