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single phase motors always warm-up it it is running at the load that less than their full power. So you get it work at 1/2 load this is i mean.

Thank you MikiBG, i confused stator copper losses, when i calculate Pfe i must take Io in stator copper losses, but when i calculate total stator cooper losses In must be taken.

I have found one my mistake by calculating stator copper losses, Io is no-load current and i must take In (nominal current)as you say. Ressistance is per phase, no problem here. Iron losses (Pfe) =Po(no-load input power)-Pcu(172,8w)-Pwf(friction and windage) Pfe=209-172,8-28 Pfe=8,2W (is it...

Thank you edison123, power factor is at no load is 0,12 (400v) and locked rotor pf= 0,62 (68v) i think they are not very small. ohmmeter is already micro ohmmeter i didnt write down here 0,001 . But Pk is high you are right. I test locked rotor at 50Hz does it affect the Pk?

Thank you ScottUK So you mean that Stator losses in that formula shuold be included windage (friction+wind), and rotor iron losses , but those losses all about rotor? in this formula i need to find stator losses (stator iron + stator copper ) Am i wrong?

http://www.miksanmotor.com/en/vibrasyon/vibrasyon_motorlar.asp

Dear Sirs I have some question about to determine losses of a small three-phase induction motors with sqiruell cage rotor. Motor is 2kw - 2 poles, nominal current is 4.8A, Y connection, 400V/50 Hz. I locked the rotor and voltage is zero, than the voltage is increased, till nominal current...

hi Is there any one who can recommend or has knowledge about any software program for sqirrel cage ac motor design? Thank you