. A text-book of electrical engineering;. th relatively large. 112 Electrical Engineering We have now to examine the drum armature of Hefner-Alteneck, whichis an improvement on the ring armature so far as the proportion of activearmature wire is concerned. Here, however, two wires having a largedifference of potential may be very close together. In the drum-winding,after a wire has passed along the external cylindrical surface under a northpole, it passes right across the end surface to a point diametrically opposite,where it then passes along the armature under the south pole. The twodiametri
. A text-book of electrical engineering;. th relatively large. 112 Electrical Engineering We have now to examine the drum armature of Hefner-Alteneck, whichis an improvement on the ring armature so far as the proportion of activearmature wire is concerned. Here, however, two wires having a largedifference of potential may be very close together. In the drum-winding,after a wire has passed along the external cylindrical surface under a northpole, it passes right across the end surface to a point diametrically opposite,where it then passes along the armature under the south pole. The twodiametrically opposite wires constitute the sides of an armature coil. Theend of the first coil is connected to the beginning of the next coil, care beingtaken that the winding is distributed uniformly over the whole periphery. To ensure this we divide the armature periphery into a suitable numberof parts (in Fig. 99 we have taken 8), and number the points successivelyI, 2, 3, etc. These are the starting points of the armature coils. To wind the.
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