. Electrical world. llestamount of energy in a given time. One important condition hasto be complied with, namely, that the energy dissipated shall notraise the temperature too high. This puts a limit on the diminutionof the radiating surface. The form of cross-section of the inter-linking rings must, of course, be such as can be satisfactorily andeconomically manufactured. Only one type of section is discussed,namely, the rectangular. It may appear that some advantage isobtained by rounding the corners of the links and of the sections,and the first of these is common practice. The second can
. Electrical world. llestamount of energy in a given time. One important condition hasto be complied with, namely, that the energy dissipated shall notraise the temperature too high. This puts a limit on the diminutionof the radiating surface. The form of cross-section of the inter-linking rings must, of course, be such as can be satisfactorily andeconomically manufactured. Only one type of section is discussed,namely, the rectangular. It may appear that some advantage isobtained by rounding the corners of the links and of the sections,and the first of these is common practice. The second can onlybe done at the of some inconvenience in manufacture, butit must be remembered that the proper ratio of the relative dimen-sions may be considerably changed by such modifications of is referred to and illustrated by a few examples further on. TWO-LINK TRANSFORMERS. Consider first the case of two closely fitting rectangular links, asshown in Fig. I, in which one end of each link is assumed to be. FIG. I.—TWO LINKS. cut oiif. In this case one of the links is of iron, while the other ismade up of the primary and secondary coils and their the dimensions of the cross-section of the iron link be a^ and b^,and let l^ he its mean length. Similarly let a, b and / be the corre- sponding dimensions of the coil link. Putting A^ and A for theareas of cross-section of the iron and of the coils, the followingequations hold: ab = A (l) aj>^ = A^ (2) / = 2 {a^ + b^ + 2a) (3) /j = 2 (O -i- 6 -f 20j) (4) I A = 2ab (a^ +b^ + 2a) —V (s) l^A^ = 20^6, (a -t- fc + 2aj) = v^ (6) Equations (5) and (6) give the volumes of the links and it isevidently desirable to have as large a section and as small a volumeas possible. It is clear that as far as the coil is concerned the leastvalue of I for a given value of A and A^ would be got if a^ = b^and b were made very large, while the product o b remained con-stant. This condition would give ff large value for l^ and c
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
