All AC ceiling fan motors (the most common ceiling fan motor) operate at temperatures that can be hot to touch. As your fan runs some of that heat transfers to the fan housing and disperses. The smaller the fan housing, the more potential for heat transfer.
All Hunter and Casablanca fans pass the product temperature standards of ETL, the agency that certifies ceiling fans. “Warm to the touch” is a normal operating condition and there is no safety issue nor does the heat shorten the life of our motors.