A method for determining the efficiencies of small motors

FRACTIONAL-HORSEPOWER motors have been developed for many uses which cause their characteristics to differ widely from larger motors. Usually they are designed for constant-load operation, but some are made to have large starting torques and others to run at constant speed. Naturally these motors have a much smaller efficiency than the larger ones, and the methods used for determining the efficiency of the larger motors are not practical for the small ones.