. Electric traction and transmission engineering . ated series motor may be adjusted to the re-quired conditions by properly proportioning the number ofarmature and field turns. Repulsion Motors. — The repulsion motor consists of afield resembling the stator of the single-phase inductionmotor, and an armature which is similar to the armaturesof direct-current and alternating-current series armature winding always remains short-circuited ina line inclined at a definite angle withthe field axis, this being accomplishedby means of brushes, bearing on thecommutator, which are joined tog
. Electric traction and transmission engineering . ated series motor may be adjusted to the re-quired conditions by properly proportioning the number ofarmature and field turns. Repulsion Motors. — The repulsion motor consists of afield resembling the stator of the single-phase inductionmotor, and an armature which is similar to the armaturesof direct-current and alternating-current series armature winding always remains short-circuited ina line inclined at a definite angle withthe field axis, this being accomplishedby means of brushes, bearing on thecommutator, which are joined togetherby a conductor of low resistance. Thefield winding is supplied with single-phase alternating current. The factthat the armature and field windingsare electrically distinct makes it pos-sible to operate the motor on high-voltage systems, the armature windingbeing so adjusted that the currentstherein can be commutated satisfac-torily. The pulsating flux through the armature, produced bythe alternating current in the field winding, may be re-. Fig. 18. TYPES AND PERFORMANCE CURVES OF MOTORS. 39 solved into two components, one in the direction of thebrush axis and the other perpendicular thereto; thesebeing represented in Fig. 18 respectively by OA and component OA produces an in the armatureconductors and causes a current to flow through other component, OB, reacts upon this armaturecurrent, thereby developing torque. Induction Motors.—The three-phase induction motormay be used for traction purposes where the service require-
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