Say, your controller can handle a two pole motor at 140krpm. This means it can handle a four magnetpole motor up to 70krpm, a 8pole motor up to 35krpm, a 10pole motor up to 28krpm and a 14pole motor up to 20krpm.
Yes, and according to my formula, the 3-phase's frequency should be 2333.33Hz provided there's no slip between the stator and the rotor.