Answer Posted / marcin

Equation with power factor in is the most correct. Several
issues shall be counted before estimating no load current :

- number of the poles

- power factor - there is a curve from the manufacturer
showing how this is changed in a function of power

- size of the machine

- speed

- way of feeding machine - DOL / inverter

Example :

500kW machine 690V 750rpm In=670A, No load - 285A (~42%)

500kW machine 690V 100rpm In=520A, No load - 180A (~34%)

Answer :

KW = 1.732 * V * I * cos phi * K

where K is a factor taking all other circumstances (0,7 to 1
where 1 is ideal situation) lower K for higher number of
poles, multispeed machines, specific construction etc...

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