. Electrical world. of Vertical Motor-Gener.\tor Set. by the Oerlikon Company, consisting in the use of copper forks, eachof which combines two commutator laminations, separated from eachother by twice the polar division, with the corresponding armaturewinding. The commutator consists of 408 segments of hard-drawncopper, 24 in. long, and with an outside diameter of 36 in. All in- iron and are screwed to the field frame. Corresponding to the twelvepoles the brush holder has twelve brushes, each of which is furnishedwith II carbon tips. These brushes are arranged so that all of themcan b
. Electrical world. of Vertical Motor-Gener.\tor Set. by the Oerlikon Company, consisting in the use of copper forks, eachof which combines two commutator laminations, separated from eachother by twice the polar division, with the corresponding armaturewinding. The commutator consists of 408 segments of hard-drawncopper, 24 in. long, and with an outside diameter of 36 in. All in- iron and are screwed to the field frame. Corresponding to the twelvepoles the brush holder has twelve brushes, each of which is furnishedwith II carbon tips. These brushes are arranged so that all of themcan be raised simultaneously when necessary to clean or true thecommutator. 6io ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 13. The motor has sixteen poIe^. The high-tension winding is laidin 192 slots. Each slot contains eighteen series wires insulated fromeach other by mica sheets . r in. thick. The winding is hand-wound,and the wires ha\e a diameter .if 4 mm. The rotor of the motor has. IIG. 3.—GEXER.\L VIEW OF . a short-circuited winding laid in 320 semi-open slots. Each slot con-tains two spool halves. Each spool forms a closed winding, and con-sists of three parallel copper strips 8 x mm. cross-section. It isnoteworthy that the motors have an air-gap of mm., though cos 0attains a maximum of Drying Out High-Tension Transformers. To the March issue of the EUCtrical Club Journal Mr. J. S. Peckcontributes an article on Methods of Drying out High-TensionTransformers. Three methods are described, namely, by the useof internal heat, external heat and internal and external heat com-bined. In applying the first-mentioned method, the transformershould be placed, if possible, in its case, though this is not essential,as it may be left in its shipping case or even placed on the floor ofa dry room. If dried out in a case the cover should be removed togive free circulation of air. The low-tension winding should beshort-circuited, and a sufficient voltag
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
