sometimes it helps to add the model and serial number. In GENERAL these small motors run somewhere around 2800 - 3400 RPM but It may not be the motor that determines what the RPM should be. It may be the parts it is attached to, meaning the impeller and its parts may limit what RPM they can spin at. So without something else to go on, all you will get are guesses. Without the model and serial no one can even find a manual to see if it is there but you missed it, or there is a service manual for it.