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A Text-Book on Electro-Magnetism and the Construction of Dynamos

A Text-Book on Electro-Magnetism and the Construction of Dynamos


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About the Book

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. 1896 Excerpt: ... Examples: Sprague motor, Rae dynamo, Manchester dynamo (English). When the winding of consequent pole frames is on horizontal cores, the cores are usually elliptical in section for mechanical reasons. Examples: Weston dynamo, Westinghouse horizontal type dynamo. Besides the general cases given above, there are numerous unclassed forms of dynamo fields with either cylindrical or elliptical cores. Examples of cylindrical cores: Gramme dynamos of certain types, Gulcher dynamo, Deprez dynamo, United States motor, etc. Examples of elliptical cores: Mather dynamo, Brush dynamo, various street railway motors, etc. In other dynamos the magnet cores are made from slabs or bars cut from merchant stock. Examples: some Siemens and Crompton dynamos. In the best dynamos, the form of core and frame is dictated by the required mechanical or electrical duty, economy of manufacture being considered at the same time. In some instances the form has been due to a whim of the designer, but whimsical dynamos cannot succeed in commercial work, on account of economical considerations. Dynamos must be designed with due consideration for economy of manufacture and for the conditions of their service. Dynamo designing is as much a science as steam engine designing, and it is as fully dependent on sound theoretical principles. As in the case of the engine, theory must be guided by judgment and experience. For the determination of field windings, we have B, Experience shows that.35 to.40 watts radiated per square inch of outer surface raises the temperature 0f the field coils about 300 to 400 C. (70 F.), which is as high as the temperature should go in good practice. Thirty-five to forty hundredths of a watt per square inch of outer surface of the coils is about equal to one-half of a ...


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Product Details
  • ISBN-13: 9781231206249
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 56
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1231206241
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 118 gr


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