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. 1897 Excerpt: ...the best, but three layers are admissible. The length of the field magnet cores may be about three or three and a half times their diameter, and provision should be made to admit of enough wire to increase the diameter of the core from two and a half tothree times. The space to be occupied by the wire may be ...
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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. 1897 Excerpt: ...the best, but three layers are admissible. The length of the field magnet cores may be about three or three and a half times their diameter, and provision should be made to admit of enough wire to increase the diameter of the core from two and a half tothree times. The space to be occupied by the wire may be ascertained by estimating its length and weight or length per pound, noting how many turns to the inch it will run. Estimate the probable diameter of the wound core, and find the mean between this and the bare core, then multiply this by the factor 3"14, and so ascertain the number of turns and the space likely to be occupied by the wire. Heavy yokes and pole pieces are always admissible, because dynamos work best when the iron in them is in excess of that needed to maintain magnetic saturation. It is also advisable to have a larger carcase than will be actually needed to furnish the required output, since machines may always be safely worked to light fewer lamps than they were designed for; but it is not safe to work them at a higher speed to procure a larger output. Before the plan for winding the armature can be drawn up, the resistance of the outer circuit--namely, the work to be done by the machine--must first be ascertained. If this resistance is too low, a shunt machine will fail to supply the required current, and a series machine will burn its coils. If too high, no current will be obtained from a series machine, and that from a shunt machine will be diminished. In large machines, carefully wound, an efficiency of 1 volt per foot of effective wire on the armature moving at a circumferential velocity of 1,250 feet per minute has been attained, but, as has been stated, 1 volt per yard is what may be expected from small machines. Although the...
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Add this copy of Dynamos and Electric Motors-How to Make and Run Them to cart. $39.46, new condition, Sold by BargainBookStores rated 3.0 out of 5 stars, ships from Grand Rapids, MI, UNITED STATES, published 2007 by Bronson Press.
Add this copy of Dynamos and Electric Motors. How to Make and Run Them to cart. $40.83, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
Add this copy of Dynamos and Electric Motors. How to Make and Run Them to cart. $43.53, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
Add this copy of Dynamos and Electric Motors: How to Make and Run Them to cart. $50.05, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2007 by Read Books.
