. Cassier's magazine . g struck by theirresistible mass. Something wouldhave to give. Following this line ofargument, its supporters hold that themotor should give way at this crisissomewhat, though not too much. Byeasing over this point and relying onthe inherent overload capacity andhigh pull-out properties to supplyto the belts, ropes and bands as muchpower as they are capable of carry-ing, they are disposed to assert thatthe net result will be a quicker ac-celeration of the spindles than withthe irresistible flywheel drive. Theyalso believe that the poorer regula-tion of the motor is not a
. Cassier's magazine . g struck by theirresistible mass. Something wouldhave to give. Following this line ofargument, its supporters hold that themotor should give way at this crisissomewhat, though not too much. Byeasing over this point and relying onthe inherent overload capacity andhigh pull-out properties to supplyto the belts, ropes and bands as muchpower as they are capable of carry-ing, they are disposed to assert thatthe net result will be a quicker ac-celeration of the spindles than withthe irresistible flywheel drive. Theyalso believe that the poorer regula-tion of the motor is not a detrimentin the spinning, since, once the spin-dles are accelerated, they provide aconstant load until they reach theend of the stretch; and a constantload means a constant speed, no mat-ter what the regulation may be. Thefact that the motor speed is slightlyhigher during the run-in than duringthe spinning is held to be no detri-ment, but rather an advantage, thetwo actions being entirely indepen- ELECTRIC DRIVING 635. FIG. 5. OUTLINE OF SPECIAL MOTOR FOR DIRECT BELT DRIVE TO WORSTED MULE dent of each other and the run-in be-ing practically lost time, like the re-turn stroke of a shaper or planer ina machine shop . Just how the two work out inpractice the writer had a very goodopportunity to observe recently wherea demonstration of both methodswas in progress. The mules wereidentical in all details of construction,and both were spinning No. 50s, softworsted yarn, with all the adjust-ments made as nearly the same aspossible. Both motors were on thesame mains of a three-phase, 60-cycle, 550rVolt circuit, and both were6-pole, 15-horse-power motors with ano-load speed of 1,200 revolutionsper minute, built especially for thisdemonstration. One carried at oneend a 250-pound flywheel, and hada rated full-load speed of 1,140, or aslip of 60 turns, 5 per cent, of theno-load speed. The other had noflywheel, and had a full-load speedof 1,080 revolutions per minute, ora slip of 10 per cen
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