A 5,5KW motor is rated 11,40A for the delta connection at 400V. This motor is coupled to a gearbox that reduces it's speed from 1440rpm to around 121rpm. On the gearbox shaft is a sprocket and chain which reduces the speed even further.
According to what I know, during starting a motor will rise to about 4-7 times its rated current for certain seconds. So I was expecting this value to be above 44A, which turned out not to be the case. In fact, the current wasn't even double it's rated value.
Now here's the question: why didn't this value rise up as much as I expected? Since there's no back emf when the rotor is stationary, the current drawn by the motor should have been significantly higher. I'm struggling to understand why it wasn't.
NB: the motor is running direct on line, no soft starters are involved.