The Electric Motor and the Transmission of Power

The Electric Motor and the Transmission of Power

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...heads h, h. Fig. 41, shows a completed toothedcore drum armature. Here, as will be seen, the external surface of the armature consists of iron, between the bands b, b. Fig. 42 represents a portion of one of the discs of a toothed-core armature. The Fig. 42.--Portion Of Disc Of Laminated ToothedCore Armature. circular holes are for the clamping bolts, while the grooves are intended for the reception of the insulated wires. It will thus be seen that a toothed-core armature is much more solid and secure, when completed, than the smooth-core armature, and, partly for this reason, the toothed-core armatures have come into general use. It is evident that the toothed-core armature does not require bands on its surface to keep the wires in place. Moreover, the length of the airgap or entrefer/ that is to say, the distance between the iron in the armature and the polar faces of the field magnets, is greatly reduced, thereby reducing the reluctance of the magnetic circuit, and recpiiring much less M. M. F. in the field magnet coils to produce a given amount of flux through the armature. Fig. 43 represents the winding of a toothed-core armature B. Here, as will be seen, the cotton covered wires are passed through the grooves. A, shows a complete armature with the wire connected to the commutator O. A simple form of commutator, called a two-part commutator is shown in Fig. 44. Such a commutator would be suitable for commuting the current produced in a single loop of wire on an armature rotated in a Fig. 44.--Diagram Of Two-part Commutator. bipolar field. In this commutator the wire W2, is connected to the segment C2, and the wire W to the segment Cn. Under these conditions, if the E. M. F. generated in the loop whose terminals are TF1 and Wa, be in...
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Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 1236851242
  • 9781236851246