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. 1893 Excerpt: ... windings, and therefore the least weight of copper. Where economy in manufacture is important, a cylindrical core is advantageous, as it lends itself readily to machine-shop practice. For these reasons, single horseshoe magnets usually have cylindrical cores. Exampies: Edison dynamo, Thomson-Houston motor type dynamo, National dynamo. When the cores and pole pieces are forged from one piece, it is more economical to make the cores square with rounded corners. Example: Edison-Hopkinson dynamo (English). Consequent pole machines with the windings on vertical cores usually have cylindrical cores. 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 s...
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