Dynamo-Electric Machinery; An Authoritative Treatise on the Theory, Construction Details, Calculation, Characteristic Curves, and Design of Dynamo-Ele

Dynamo-Electric Machinery; An Authoritative Treatise on the Theory, Construction Details, Calculation, Characteristic Curves, and Design of Dynamo-Ele

By (author) 

List price: US$19.99

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

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. 1908 edition. Excerpt: ...p-f-2 winding elements. For this winding, then, we have, yt = +o; tfb-+5; y-T =5; yr = +10. The resultant step is yt + yb as before; and the number of such Fig. 128. Typical Simplex Wave Winding, and Winding Table for Same. steps being Z-4-2, and the total travel through the winding being U, we have; In order that no conductor be encountered twice in traversing the winding, it must not be possible, by any number of repetitions of the step yt + yD, to recur to the step yt beyond any previous number of repetitions of the resultant step. Hence, if m and n arc any whole numbers, m (yt + yD) must not equal n (yt + yb) steps plus -/f. That is, m (.yt +!/b ) n (yt + yt) + yt It follows in this case, also, that yt and yb cannot have any common factor; and as their sum must be even, both of them may be odd, since U may be any number. They may, however, be equal to one another, and this is commonly the case. General Formulae for Drum Windings. In general, if y stands for the complete step from the first conductor of any group to the first conductor of the next group, m for the field step, and G for the total number of groups in the winding, we shall have, from the previous deductions: mZ = mgG =--p y c, when Z =-r- -;and y = 2m J p which are the general formulae for symmetrical windings, where g is the number of conductors per group. For lap windings we have m = 0, so that, 2c V We may separate y into two parts yt and y, of which either is negative, and either slightly less than or equal to Z-r p, and which differ from one another by 2c-p. In lap windings the step of the winding at the commutator is related to the winding pitch by the simple rule: Thus, in a simple winding of this type where y = 2, and where each element of the...show more

Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236589513
  • 9781236589514