You can run 50Hz motors on 60 Hz provided that you keep the V/Hz ratio the same. If you increase the frequency, you must increase the voltage by the same ratio.
In your case, 230/50 = 4.6 Therefore at 60Hz, you voltage should be 60 x 4.6 = 276.
If you operate at a lower voltage, the flux in the iron will be reduced and the maximum power of the motor wil also be reduced.
You must also be careful that the increase in speed does not overload the motor. With a pan or a pump, a small increase in speed can give a large increase in power.
see http://www.lmphotonics.com/faq/faq_qanda.php?id=12
Best regards,
Mark Empson
http://www.LMPhotonics.com | http://www.LMPForum.com

[This message has been edited by marke (edited 02-10-2006).]