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. 1922 Excerpt: ...laminating the iron. The eddy-current loss is due to local currents induced in the iron by a varying flux. If flux in a conductor varies in density or direction, an electromotive force is set up which in turn causes a current to flow in such a direction as to oppose the change in flux density. This is commonly known as ...
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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. 1922 Excerpt: ...laminating the iron. The eddy-current loss is due to local currents induced in the iron by a varying flux. If flux in a conductor varies in density or direction, an electromotive force is set up which in turn causes a current to flow in such a direction as to oppose the change in flux density. This is commonly known as Lenz's Law. The strength of these currents is inversely proportional to the resistance of the material and their path is such that they encircle the flux producing them. The function of the laminations is to increase the resistance of the eddy-current path and consequently decrease the heating loss. The laminations are insulated from one another by insulating varnish or an oxide of iron so each eddycurrent path is confined to one lamination. For a given width of lamination, since the thickness is negligible compared to the width, the length of any eddy-current path is independent of its distance from the center of the lamination. The flux linking any path is proportional to the distance, x, of the path from the center of the lamination. The cross-section of a differential path of unit width is dx. The voltage causing the current to flow is proportional to the area or x, whence pe =--= dx watts loss per path, where k = constant; x = distance from center of lamination to path under con-sideration; p = the specific resistance of iron; kx-voltage of elementary eddy current path; T = thickness of lamination. The above expression when integrated and limits substituted is as follows: which shows that the eddy current loss per unit volume is proportional to the thickness of the lamination squared and inversely proportional to the specific resistance of the iron. Since the voltage of any eddy-current path is proportional to the frequency or speed and ...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Very good. black cloth clean. text clean / tight. nice copy. xix, 458 p. illus., diagrs. 24 cm. Includes Illustrations. Bibliography at end of chapters I and III and most of the experiments.
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Very good. No dust jacket. Signed by previous owner. Book Condition: Good-very good. Very light yellowing near page tops, otherwise clean interior pages. Writing inside front cover.
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UsedVery Good. Hardcover, 4th edition; light fading, light shelf wear to exterior; former owner's name written inside front board; otherwise contents in very good co ndition with clean text, firm binding.