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Right, but, the point is if you have a motor chosen for an application-and there are an almost infinite number of different applications-and you’ve chosen one that runs at 1770 RPM because that is exactly what you need for that application and everything involved is set for that requirement, with this “experiment” that could apparently vary at any given moment-I think.

I think it would depend on how fast the frequency could fluctuate and how far. The physics of a large ensemble of generators feeding the grid place considerable physical constraints on these two quantities.

If the claimed limit of 14 seconds per day is a reliable indication, that works out to 162 parts per million. Unless your motor-driven industrial system is doing audio or video work, that amount of deviation is probably trivial.

This brings to mind the time in 1967 I was watching a TV network show originating, on film, from New York City. Suddenly, the image went dim, slowed down noticeably as was evident from the sound track, and then went dark. A few seconds later the local station put up a network trouble slide. This was the great 1967 northeast blackout. The projector was equipped, as most are, with a synchronous motor, so I was actually seeing, for a second or two, the frequency of the entire northeast grid sagging well below 60 Hz before going away completely.