. American engineer and railroad journal . (iEAKHU MOTOR DRIVE UlON A LAllGE NILES BORING MILL AT THEWORKS OF THE BULLOCK ELECTRIC AND MANUFACTUKING CO. BELTED DRIVE UPON A 54-IN. CAR-WHEEL BORING MILL.— SELLERS & CO. VARIABLE-SPEED GENERAL ELECTRIC MOTOR. This is indeed a valuable arrangement for driving from aconstant-speed motor where a variable-speed motor cannot beused. The Betts Company do not, however, advocate the useof a constant-speed motor where it can be avoided, preferringa variable-speed motor with a speedrange of about 4 to 1 and operatedby a controller, so as to avoid t
. American engineer and railroad journal . (iEAKHU MOTOR DRIVE UlON A LAllGE NILES BORING MILL AT THEWORKS OF THE BULLOCK ELECTRIC AND MANUFACTUKING CO. BELTED DRIVE UPON A 54-IN. CAR-WHEEL BORING MILL.— SELLERS & CO. VARIABLE-SPEED GENERAL ELECTRIC MOTOR. This is indeed a valuable arrangement for driving from aconstant-speed motor where a variable-speed motor cannot beused. The Betts Company do not, however, advocate the useof a constant-speed motor where it can be avoided, preferringa variable-speed motor with a speedrange of about 4 to 1 and operatedby a controller, so as to avoid thenecessity of making the gearchanges. The latter method of driv-ing by variable-speed motors is, ofcourse, proving in practice to be farmore convenient. The engraving on page 245 is anillustration of a variable-speed motordrive applied to a 51-in. boring millbuilt by the Niles Tool Works Com-pany. The motor used in this caseIs a multiple-voltage systemmotor, supplied by the Bullock Elec-tric Manufacturing Company, Cin-cinn
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
