[Al Skierkiewicz]

Kat,
It is hard to predict. If you are asking that the motor only runs for a turn or two at heavy load then the answer is likely no problem. It you are running at normal speed with intermittant heavy load, the answer is dependent on how often the heavy load is applied. The FP motor is a powerful motor for it's size but as with any motor, getting rid of heat is an issue. The FP designers made some tradeoffs such that the integral fan needs to spin at high RPM (the fan is attached to the motor shaft. You can see it if you look in the slots of the motor.). One little quirck about this motor is when it gets hot, the fan blades release from the shaft and stop moving altogether. If you look at the motor curves you can get an idea where the more efficient operating RPMs occur. Base you design on that type of decision. Don't hide the motor inside an enclosure and make sure the cooling slots remain open in your mounting design.