Below is a list of Fractional Horsepower Motors manufacturers from St. Louis, Missouri. A fractional horsepower motor is a motor built in a frame and has power rating smaller than one horsepower. Also known as FHP motors, being categorized as a fractional hp motor can be relative to the frame size as well as the amount of fractional horsepower. For instance, if the frame size is a 42, 48 or 56, the motor can still be classified as a fractional horsepower motor even if the horsepower exceeds one horsepower, although motors such as ½ HP motors and ¼ HP motors are more easily identifiable.