temperature prediction of motor

[bscout]

I am trying to figure out a clever way to estimate the temperature of motor windings based on the current and motor velocity.  I know that this is a complicated problem that is responsive to many factors (ambient temp, humidity, air flow ect...), but I was wondering if anyone has tried something similar and had good results.  So far I have just tried integrating the current and computing a running average.  It is not very sophisticated and it doesn't really work very well...  Any Ideas?

Bscout

[Brian_Beal]

Unless your motor is fan cooled, speed will have nothing to do with it.  Most drive manufacturers use an I squared t calculation.  In other  words, predicted temperature is based on current, and time at a given current.  I don't know what the exact curves are, but I am pretty sure that they would be logarithmic.