By Alexander Gray
In contrast to another reproductions of vintage texts (1) we haven't used OCR(Optical personality Recognition), as this ends up in undesirable caliber books with brought typos. (2) In books the place there are pictures resembling images, maps, sketches and so forth now we have endeavoured to maintain the standard of those photographs, in order that they symbolize correctly the unique artefact. even supposing sometimes there is sure imperfections with those outdated texts, we think they should be made on hand for destiny generations to get pleasure from.
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Additional info for Electrical Machine Design The Design and Specification Of Direct And Alternating Current Machinery
C) Bake the coil in a vacuum, tank at 100 C. so as to expel all moisture, then dip it into a tank of impregnating compound at 120 C. and leave it there long enough to become saturated with the compound. 01 in. thick on the slot part and lap it over as shown at d. This empire cloth 1J in. longer, than the core so that it sticks out f in. from (d) of the coil is each end. 01 in, thick on the slot part of the and lap it over as shown at e. This paper also is 1J- in. longer than the core; it is not put on for insulating purposes but (e) coil to protect the other insulation which is liable otherwise to become damaged when the coils are being placed in the slots.
12 shows a two-pole simplex singly re-entrant drum winding with 16 conductors. It might seem that conductors Fig. FIG. 12. Two-polo simplex singly ro-entnmt drum winding. 11"213 "4-15-0-1, which shows clearly that the winding is re-entrant, and atao that every conductor has been taken in once and only once* ARMATURE WINDING The connections of this 11 winding to the commutator arc shown in Fig. 12. Fig. 18 is another method adopted to show the connections of the same winding and is obtained by splitting Fig.
26; there are eight conductors per alot and comiuotortt lira numbered similarly in Figs, 25 and 26, In each art Pig. 25 ARMATURE WINDING Pia, 24. Multiple winding with four coil sides 21 per slot and two turns per coil FKJ 25,* Beriea winding with four coil tiidcs per slot and two turns per coil 1286 Fio. 26* Section through one slot of the above windings. ELECTRICAL MACHINE DEMdN 22 to a slot since, the minibor of eonunuta- two commutator segments always the same us the number of coils, in fact be defined as the winding element between two tor segments a coil may is commutator segments.
Electrical Machine Design The Design and Specification Of Direct And Alternating Current Machinery by Alexander Gray