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D12 ect C urren t Arma tures
Repairing DirectCurrent Motors
8 other sections not shown
alternating current alternating-current armature core armature winding ball bearings bearing bracket bolts brushes center line centrifugal switch clamping coils are connected commutator bars conductor connected in series copper core discs current ﬂowing cycles defective coil delta delta connection diagram direct current direct-current e.m.f. induced electrical degrees external leads ﬁeld coils ﬁrst coil ﬁt Group Connections groups of coils growler inch induction motor inductors inserted laminations layer lead is connected lines of force located Loops of Wire machine magnetic ﬁeld magnetic lines magnetic poles method of connecting mica necessary nected number of coils number of poles number of turns open circuit operated phase groups phase windings polarity pole pieces pole-phase groups position removed repair rewinding ring rotor shaft shellac short-circuited shown in Fig single-phase motor skein sleeve soldered speed starting winding stator three-phase type of coil usually varnish voltage voltage wave volts winder wire wound