If your motor is smoking of cycling on and off, it is severly overheating. This guide discusses some of the conditions that cause your motor to overheat. If this problem isn't corrected, it will burn out your motor's windings and cause it to fail.
Note: A running motor that is too hot to touch is not necessarily overheating. If the automatic protector is not tripping and the actual running amps do not exceed the maximum amps on the nameplate, the motor is not overheating.