. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . or voltage 420. GENERAL CHARACTERISTICS OF ALL SINGLE-PHASE MOTORS. Laminated magnetic fields are used, the laminated steel ring corebeing held by an independent steel enclosing case. Field windings are distributed in slots, in the entire inner circum-ference of the field core, and there are no salient poles. Armature windings or coils are made up and connected to the com-mutator in the sanie way as in direct-current motors. Resistance leadsare place
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . or voltage 420. GENERAL CHARACTERISTICS OF ALL SINGLE-PHASE MOTORS. Laminated magnetic fields are used, the laminated steel ring corebeing held by an independent steel enclosing case. Field windings are distributed in slots, in the entire inner circum-ference of the field core, and there are no salient poles. Armature windings or coils are made up and connected to the com-mutator in the sanie way as in direct-current motors. Resistance leadsare placed between the coils and commutator of series motors to reducethe short-circuit currents induced in the coils by the transformer actionof the main field, paiticularly when the motor is starting. This resistanceis not always used with repulsion motors. Sparking exists at the commutator brushes largely because the rever-sals of current occur at the top of the current wave, which is about 40per cent, higher than the mean effective value. Compensation or auxiliary series windings in the slots in the pole 172 ELECTRIC TRACTION FOR RAILWAY TRAINS. Fig. 34.—Details of Connections for Allgemeine Elektricitats-Gesellschaft Single-phase Repulsion-type Motors.
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Keywords: ., bookcentury1900, bookdecade1910, bookidelec, booksubjectrailroads
