of the motor. In laboratory tests the motor stood up under repeated heavy hammer blows. It was undamaged in drops from the bed of a truck to the platform.
Motors of this type---from five to 75 horsepower--are urgently needed in the automobile, petroleum and chemical industries and by machine tool manufacturers.
Keynote of the new rn~tor is its "flexibility," with the design so worked out that maximum use is made of a minimum number of parts.
Focal point of the flexibility built into the new motor centers upon the stator core (circular stationary part) and the frame assembly. The identical stator core and frame assembly is used regardless of whether the finished motor will be drip-proof, splash-proof, totally enclosed fan-cooled, or totally enclosed non-ventilated. As a comparison, the old line motor required a different frame casting for each of these types of enclosure.
Construction of vertical or horizontal motors without feet represents another phase. To obtain the round, footless frame all that is required is to leave off the steel foot assembly. In conventional type frames, this means a different frame casting. Then, too, the new motor was designed so that the bearing housings in each type of bracket have the same location. This necessitates the use of only one set of shaft dimensions and enables all shafts for a given size motor to be made in the same grinding set-up.
W. A. R. P.