. 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. Fig. 1,494.—Laminated core with two coils in position; type of punchings used on somemachines having concentrated whole coil windings. The manner of assembling the coilsis shown in fig. 1,495. Ques. What is the wave form with a concentratedwinding? Ans. The pressure curve rises suddenly in value slots pass under the pole pieces, and falls sud
. 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. Fig. 1,494.—Laminated core with two coils in position; type of punchings used on somemachines having concentrated whole coil windings. The manner of assembling the coilsis shown in fig. 1,495. Ques. What is the wave form with a concentratedwinding? Ans. The pressure curve rises suddenly in value slots pass under the pole pieces, and falls suddenly asthe armature slots recede from under the pole pieces. .WEDGES CONCENTRATEDCOILS IIUll/l/l/l/l <v J i II iiiiiiiiliiimiiiiiim. LAMANAE Fig. 1,495.—-Westinghouse single phase concentrated coil armature; view showing methodof placing coils. The coils are machine wound on formers and after being taped, varnishedand baked, are spread out slightly so as to pass over the teeth and are then forced intoplace in the deep slots by means of wooden wedges, being securely held in place by retain-ing wedges, as shown in fig. 1,494. IIAWKIXS ELECTRICITY Distributed or Multi-Coil Windings.—Instead of winding an armature so it will occupy only one slot per ph pole, it may be spread out so as to fill several slots per phase per arrangement is called a distributed winding. To illustrate, fig. 1,496 represents a coil of say fifteen turns. Thiscould be placed on an armature just as it is, in which case only oneslot would be required for each side, that is, two in all. In place of
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