60 hz on 50 hz

http://www.brighthubengineering.com/diy-electronics-devices/46495-can-a-motor-be-run-on-lowerhigher-than-rated-frequency/

N = 120f/P


T α s * V^2.
T α s * V^2.

Where T = torque,

s = slip and

V = the supply voltage.