GB120593A - Improvements in Magnet Coil Windings, specially applicable to Field Coil Windings for Dynamo Electric Machines, Transformers and the like. - Google Patents

Abstract

120,593. Lancashire Dynamo & Motor Co., and Whitmore, H. B. Oct. 8, 1917. Coils.-Relates to coil windings for the magnets of dynamo-electric machines of the type in which the coil is made from a number of stampings of flat sheet metal or the like which are fitted together to form a coil, and consists in so forming the stampings as to facilitate ventilation and cooling of the coil. For this purpose, the stampings may be formed with the outer contour eccentric with respect to the inner contour, as shown in Figs. 1 and 2<a>, so that when the stampings are assembled with their ends overlapping as indicated by the dotted lines, successive stampings will project at different portions of the circumference of the coil and produce projecting flanges giving increased cooling surface. Alternatively, slots may be formed in the body of the stamping as shown in Fig. 5, or notches may be formed on the inner contour, as shown in Fig. 4, so as to form ventilating passages through the substance of the coil, or between the coil and the core. Each stamping may completely surround the core, as in the forms shown, or each turn may be built up of two or four pieces, metal being thus saved in the stamping. A method is described of forming the stampings with lugs to provide terminals.