Most likely all the lubrication was gone from the shaft making it really hard to turn. As long as you kept it on and hot it was able to turn. If it can't turn at the speed that it's intended then the windings get very hot.. The motors are protected by thermostatic and current overload protectors, about 3/4" long. One of these breakers triggered. It can give quite a pop. It's fairly harmless because the only fuel source is the insulation on the wires. The shellac coating on the windings was burning and that's where the smoke and smell emanated from.
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18 years ago