. 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. a startinging to bring the rotor up to speed as an indnction motor, and also serves as a dampingdevice to neutralise any tendency toward hunting caused by variation in * : _:: .- r *..v. :m~ . - ave of an alternator is peaked and two machines are operated in parallel it is very difficult to keep them in step,that is in synchronism. Any differen
. 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. a startinging to bring the rotor up to speed as an indnction motor, and also serves as a dampingdevice to neutralise any tendency toward hunting caused by variation in * : _:: .- r *..v. :m~ . - ave of an alternator is peaked and two machines are operated in parallel it is very difficult to keep them in step,that is in synchronism. Any difference in the phase relationh is set up by the alternation will cause a local or syn-chronizing current to flow between the two machines and attimes it becomes so great that they must be disconnected. -rnators which produce a smooth current wave and aremaintained at uniform speed by properly designed governors, ALTERNATORS 1,155 operate fairly well in parallel, but are not entirely free fromhunting, and other means are provided to overcome the difficulty. When heavy copper flanges, called dampers, are put over thepolar projections or copper bars laid in grooves on the poleface and short circuited by connecting rings (called amortisseur. Fig. 1,405.—Westinghouse field with amortisseur or damper winding for 75 kva. and largerbelted alternators, which prevents hunting and reduces eddy currents in the pole copper bars of the amortisseur cage winding are arranged in partially closed slots inthe pole pieces. winding), the powerful induced currents which are produced whenthe alternators get out of step tend to quickly re-establish thephase relation. Two examples of a field provided with amortisseur windingis shown in figs. 1,404 and 1,405. NOTE.—Amortisseur windings are often erroneously called squirrel cage windingson account of similarity of construction. The latter term should be reserved for its propersignificance as being the name of the type of armature winding genera
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