Yeah, assuming a "thermally protected" induction motor -- i.e. one that actually draws a lot of LRA. "Small" in this case would be probably 100-1000W. I mean, in the grand scheme of things, single phase motors are already quite "small", so I should probably assume even less -- but it would be nice to have the type given.
For the other case ("impedance protected"), it simply doesn't matter, it's a non-issue -- it'll get toasty, sure, but it won't catch fire. You may still be able to sense it electronically (see above), but a far easier method is to just stick a motion sensor on the shaft and not care further.
Typically "impedance protected" types are shaded-pole motors. They're very inefficient to begin with, so are ineffective over some tens of watts.
Also, is this a design or maintenance problem? It matters, as a lot of us here are designers, and may assume anything about the design is up for grabs. Whereas in a maintenance context, you might have to put in a lot of work to add that rotation sensor.
Tim