If your motor is 380V, 50 Hz, and the available power system frequency is 60 hz then
V? = 4.44 x Magnetic flux x 60 x 10 raised to -8
380 = 4.44 x Magnetic flux x 50 x 10 raised to -8
Find V?
Cancel Magnetic flux = negligible effect
cancel 10 raised to -8, cancel 4.44
v = 456 volts.
if...