I don't know enough about it to say if it's possible for an intra-rotor failure to cause that kind of heat without causing overcurrent in the stator? I'll run it by our motor gurus and see if they have any theories. I handled the hell out of it right before lunch, and now despite washing my hands, I am eating the stinkiest sandwich ever.
Here its a loosing battle to have out maintenance, pump and service electricians change the o/l's when changing motors.
The answer is always the same, "It worked before" & "Its suppose to run at the service factor, that's why it's labeled".
The same thing happened in an I-R screw compressor. The 60 HP must've got hot that the rotor melted in the same way. The compressor and the motor bearings didn't seize and the overloads were correct. A special OEM motor, made for IR, by Reliance. The new motor was made by Weg.
All jokes aside, if vegetarian food is good (and it can be) I can go without meat, but no way in hell would I be a vegan. When was in Germany in Sept. 2011 ate nothing but vegetarian food but then my aunt is a good cook.
I worked at a firm, that made high quality, OEM motors.
It was definitely a fault in the injection cast, squirrel cage rotor. One of the bars, might've been a high resistance bar, due to a casting fault. There was many variables in the casting operation.
I was involved in engineering testing and I witnessed rotors, failing in this manner.
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