. 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. of the increased danger from inducedvoltage, in case the machine is used as a synchronous motor, the builders consider anyhigher voltage undesirable. struction permits a reduction of air gap to a minimum, thus re-ducing the amount of copper required for the field. Armature Windings.—In general, the schemes for armaturewindings fcr alternators are simpler th
. 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. of the increased danger from inducedvoltage, in case the machine is used as a synchronous motor, the builders consider anyhigher voltage undesirable. struction permits a reduction of air gap to a minimum, thus re-ducing the amount of copper required for the field. Armature Windings.—In general, the schemes for armaturewindings fcr alternators are simpler than those for direct currentmachines, as in the majority of cases the inductors are an evenmultiple of the number of poles, and the groupings are usuallysymmetrical with respect to each pole or eat h pair of poles. Further-more, as a general rule, all the inductors of any one phase are inseries with one another; therefore, there is only one circuit per CONSTRUCTION OF ALTERNATORS 1,207 phase, and this is as it should be, since alternators are usuallyrequired to generate high voltages. The?e general principlesestablish the rule, that in the circuit in a single phase armature,and in the indv:dual circuits in a polyphase armature, the. Fig. 1,482.—Section of General Electric Alternator showing method of dovetailing core lamina-tions to frame. The latter is made in two general styles, known as the box type andskeleton type. The bos type consists of a single casting for the smaller sizes, but for largecapacity alternators the frame castings are usually divided into upper and lower skeleton type consists of two side castings between which substantia! spacingrods are set at regular intervals. The core consists of the usual sheet iron laminationslotted and assembled; they are mounted on the inner periphery of the frame, makinglap joints (that is staggered as in fig. 1,480), each section being dovetailed to the clamping rings or end plates are mounted on both
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