. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. eld in place in the frame bvheavy end rings and by steel clamping fingers which are firmly bolted to the frame. Theouter circumference of the core is dovetailed to the frame, and the inner circumference isslotted to receive the The alignment of the slots is insured by means of metalwedges, and no filing is done on the slots, so that each laminati
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. eld in place in the frame bvheavy end rings and by steel clamping fingers which are firmly bolted to the frame. Theouter circumference of the core is dovetailed to the frame, and the inner circumference isslotted to receive the The alignment of the slots is insured by means of metalwedges, and no filing is done on the slots, so that each lamination is always insulated fromthe next one. Numerous ventilating ducts allow the free circulation of cool air throughand around the coils. The open slot construction is employed and the coils are fitted intoinsulating troughs which offer excellent mechanical and electric protection. The coilsare held in place by suitable wedges. o. With respect to the shape of the coil ends, as: a. Single range; b. Two range; etc 1,212 IIAWKIXS ELECTRICITY In addition to these several classes of -grinding, there are anumber of miscellaneous windings of which the following mightbe mentioned: a. Chain or basket windii b. Skew coil windinjc. Fed-in Fig. —M ■•-. d of assembling form wound coils. The picture shows a section of a General Bfectric armature with part of the cods in in the slots, before inserting the coils as s«.and surrounded by this layer of .nsulatmg material thenotches, thus closing the slots and protecting the ccwedges are seen in position at the right. ing materia! . are inserted ical injury* A tew d. Imbricated winding; c. Mummified winding; /. Spiral winding; g. Shuttle winding; h. Creeping windii l. Turbine alternator winding. CONSTRUCTION OF ALTERNATORS 1,213 Ques. Define a revolving and a stationary winding. Ans. The words are self-defining; a winding is said to berevolving or stationary according as the armature forms therotor or stator of the ma
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