. 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. ated wire, so that when rotated, a powerful ■d portions in the t« • -en in the position shown top and bottom, finding a directing< When in the position shown in the second diagram, the lines are converged so as to pass through the armature core. shows detail of the armature core Figs to —Diarmature is wound fialternatingstrength is
. 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. ated wire, so that when rotated, a powerful ■d portions in the t« • -en in the position shown top and bottom, finding a directing< When in the position shown in the second diagram, the lines are converged so as to pass through the armature core. shows detail of the armature core Figs to —Diarmature is wound fialternatingstrength is shown byin the first diagram, tpath through the m CONSTR UCTION OF AL TERN A TORS 1,195 Ques. What are the two principal types of field magnet ? Ans. Stationary and revolving. Ques. What is the usual construction of stationaryfield magnets? Ans. Laminated pole pieces are used, each pole being madeup of a number of steel stampings riveted together and bolted or. Fig. —Stationary field of Fort Wayne multiphase revolving armature alternator; viewshowing brass girds on pole pieces for synchronous motor operation. When designedfor this use the machine is provided with amortisseur winding on the poles. As shown inthe illustration this winding consists of a brass collar around the pole tip witn a cross ribintegral with the collar, fitting in a slot in the pole face parallel to the shaft. This con-struction assists in bringing the machine up to synchronous speed as an induction motor,ordinarily checks any tendency toward hunting and does not in any way affect the opera-tion of the machine as an alternator. The main field winding should be connected throughswitches on the field frame in order that the field circuit may be broken up to eliminateany danger that might arise from induced voltage. It is not advisable to throw on a fullrated voltage and a compensator should, therefore, be provided to reduce the pressure. preferably cast into the fr
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