Motor damage
Motor damage
(OP)
For a three phase motor, what is the average time to motor damage once the motor loses one phase? Assume it is operating at full load.
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RE: Motor damage
I dont think you could assume an average...but it would be measured probably in seconds rather than minutes.....and probably only very few seconds to cause serious damage!!(as little as 15 secs )
jeff
www.motors-direct.co.uk
RE: Motor damage
W = (i^2)t = Ilr^2 * 20 sec
or t = W/(i^2)
RE: Motor damage
When there is single phasing, the withstand time should be much less than 20sec (the NEMA value is for stalling with three phase power available, I presume)if the motor stalls.
It can be calculated for motor stalled condition as well as 'coninues to run' condition if the motor (I2SquaredT)value and the motor currents (at the time of single phasing) are known.
The (I2SquaredT) value is part of the data sheets for alternators, I am not sure about the motors. May someone in the forum can help.
raghunath_n00@rediffmail.com
RE: Motor damage