TransactionsPublished under the care of the General Secretary and the Treasurer . shown in Fig. 11, should fulfill theconditions satisfactorily, as the upper curve is drawn through maxi-mum values, and when they are reached the overload on the motorwould only be 30 per cent. Eeferring to the dimensions and ratings furnished by one of themanufacturers, whose apparatus has shown up very favorably under DAY: MOTORS IX MACHINE SHOPS. 605 test, we find that a motor weighing 1615 lbs. will deliver 10 horse-power between a range of 350 and 1050 , or one weigh-ing 2300 lbs. will deliver 1
TransactionsPublished under the care of the General Secretary and the Treasurer . shown in Fig. 11, should fulfill theconditions satisfactorily, as the upper curve is drawn through maxi-mum values, and when they are reached the overload on the motorwould only be 30 per cent. Eeferring to the dimensions and ratings furnished by one of themanufacturers, whose apparatus has shown up very favorably under DAY: MOTORS IX MACHINE SHOPS. 605 test, we find that a motor weighing 1615 lbs. will deliver 10 horse-power between a range of 350 and 1050 , or one weigh-ing 2300 lbs. will deliver 10 horse-power between 225 and900 We would recommend the use of the last frame, assatisfactory commutation should be assured by the smaller speedrange, namely, 225 to 787 (2) Double Commutator Motor (Combined with Field Weaken-ing).The additional cost of the double commutator motor, togetherwith the maintenance of two commutators instead of one, are ob-jections to this system that, in our estimation, offset its advantagesfor other than special Face Plate Fig. 12.— Data relative to Edison three-wire motor equipment forlathe. (3) Edison Three-Wire System. The combination of the Edison three-wire system with fieldweakening permits of a range of 4 to 1, with but 100 per centincrease in speed by the latter means, and, consequently, elimi-nates commutator troubles to a marked extent. The balanced three-wire system has been adopted quite generallyin the past for lighting purposes, and may be obtained either bymeans of standard generator, together with a separate balancer, orby providing the former with slip rings connected to an autotrans-former from the middle point of which the neutral is taken. Thelatter arrangement is advocated by manufacturers of this apparatus. The selection of motor to operate on three-wire system for the 606 DAY: MOTORS IN MACHINE SHOPS. GO-in, lathe should be based on curves shown in Fig. 12. The
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Keywords: ., bookcentury1900, bookdecade1900, bookidtr, booksubjectelectricity
