The Dynamo: Its Theory, Design and Manufacture (Classic Reprint)

Excerpt from The Dynamo: Its Theory, Design and Manufacture

Since the last edition of the present book great progress has been made in the science of dynamo design, and even more in the art of dynamo manufacture. In the continuous-current field the increase in the size of modem machines has necessarily brought about the adoption of multipolar forms, while the demand for power and traction generators has led to the reintroduction on a widely extended scale of the slotted armature with carbon collecting brushes. At the same time the utmost economy in the materials and labour employed in the manufacture of a machine is imperatively called for in order to meet the increasing keenness of a world-wide competition; every pound of copper and of iron must be utilised to its fullest extent, and designs involving high-priced skilled labour must give way to simple types having easily-made interchangeable parts, with the consequent result that the machines for given outputs are smaller and more standardized. While in the above changes America has led the way, the no less marked advance on the alternating-current side has been chiefly due to Continental engineers, and consists primarily in a change from single-phase to polyphase distribution. The pioneer work of the Frankfort Exhibition of 1891 reached its cul minating point in the Paris Exhibition of 1900, in which the ll'lreephase generators were in striking preponderance as compared with the single-phase altemators, only two of the latter class being exhibited.

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