This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...one had its bobbins wound on a solid armature core, and heated to a wasteful degree. This fault was soon eliminated. In structure this excellent machine differs very materially from other types. In the first place the field poles confront either side of the armature, and hence the magnetic lines pass through the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...one had its bobbins wound on a solid armature core, and heated to a wasteful degree. This fault was soon eliminated. In structure this excellent machine differs very materially from other types. In the first place the field poles confront either side of the armature, and hence the magnetic lines pass through the armature parallel, not perpendicular, to the shaft. The armature core is therefore laminated, not with discs, but with concentric sheets formed by winding up band iron. The space between coils is occupied by projections built up of sheet iron, and serving the double purpose of holding the coils in position and improving the magnetic circuit. By means of Figs. 94 and 95 we see that the field spools are in series with each other and the armature. To facilitate assembling, the brass tips of each magnet are lettered, those of like letters connecting together. A unique feature of the field structure is that between each coil and the iron core is a sheet of copper soldered to form a sheath, which, by itself becoming the seat of induced currents, due to the fluctuating field current, protects the iron core from these effects. The second point in which the Brush machine differs from others, follows from the first. Since the field poles face the armature's side, here are to be found the active wires, and not on the outer face. The armature is, therefore, made as short as is practicable, and somewhat Fig. 96. resembles a large disc. Machines as now made have eight, sixteen, or twenty-four armature bobbins, divided into sets of four coils. The coils of each set are in series, their final leads are connected to adjacent commutator bars, and alternate in position and action with those of the other sets. The connections for two sets of bobbins are shown in Fig. 9...
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Add this copy of Shop and Road Testing of Dynamos and Motors: A to cart. $66.25, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2015 by Arkose Press.
Add this copy of Shop and Road Testing of Dynamos and Motors: a to cart. $69.86, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2015 by Arkose Press.
