What caused this motor to burn up?

This motor turns fine.  Ohms are 0.4 on all phases, same as all the others.  I was doing some tuning in the house and smelled burning.  Stopped and found this motor was scalding hot.  So hot that 10 minutes later, it was STILL scalding hot.  What causes this?  You can see three windings in the motor are burnt up.

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  • What does your meter read as a resistance with the two probes shorted together? Most multimeters are not capable of reading the sort of low resistances found in our motor windings. I would say there is a short.
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