Do not diagnose the motor by touching its casing. Some heat can arise during operation, but an unfamiliar rise in heat, smell or protection stop needs attention in the context of how the appliance was used.
What the observation tells you
Keep hands away from potentially hot surfaces and do not run another load to compare temperatures. Record whether the unit had been grinding continuously, had stalled or was used with an unsuitable load. The absence of visible smoke is not a clearance to continue.
A useful next step
Stop use if overheating is suspected and obtain model-specific advice. Do not remove covers or cool the appliance by spraying it with water.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.