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My problem is usually the opposite, 60 Hz equipment running on 50
Hz. There should'nt be any big problem, all motors will go a little
faster but the difference is so small the bearings won't even
notice. In Europe standard simple motors run at around 1400 rps or
2800 rps and in the US it is 1700 and 3400 rps. It is all the same
but for the 50/60 issue.
It basically depends on how the motors windings are configured, a
lower rpm-motor will have a different configuration, run at 1/2 or
1/4 rpm, be larger, heavier and probably more expensive. Therefore a
frequency controller is not a bad idea, it creates a frequency from
1 up to 400 Hz and can therefore fool your motor run at any speed
you desire. Be careful above 100 Hz as it now can become a heat
issue (the motor is running twice its intended speed). On the up
side the motor will keep most of its power when slowed down.
I have frequency controllers on several machines; rock saw, cabbing
and polishing machines and exhaust fan. I bought mine second hand,
older models not aimed at computer control, for approx. US $100-150.