[Hamid]

I didn’t see any standard amount. For 50 (60) Hz motors, I0/In (no-load current/rated current) decreases with motor power from 0.5 to 0.8 (in sub kW power range) to 0.2 to 0.3 in the high power range, but it increases with the number of pole pairs. For low airgap flux densities, the no-load current tends to be smaller. A typical magnetization curve is shown in following picture for motors in the kW power range at 50 (60) Hz. The I0 and In are no load and full load stator phase currents and F_1m0 is The no load (zero rotor current) design airgap flux density is Bg1 = 0.6