METHOD OF TURN-TO-TURN SHORT CIRCUIT DETECTION IN WINDING OF ROTATING ARMATURE OF ELECTRICAL COLLECTOR MACHINE WITH EQUALISING CONNECTIONS

摘要

FIELD: test equipment.SUBSTANCE: invention refers to winding tests for DC collector machine armatures. Substance of invention involves shock pulse excitation mode run simultaneously in all parallel winding paths of rotating armature by excitation voltage pulse transmission from pulse voltage generator with repetition rate of 50 pulses per second or the like to collector against the case. Winding turn isolation fault is registered by inductance sensor of astatic structure with ferromagnetic core with air clearance slot oriented along coil outputs near commutator lugs in sections with maximum test voltages between turns in the middle of each parallel winding path due to armature winding symmetry about excitation point, and by magnetic pulse field metre with electronic memory cell for maximum levels of magnetic pulse field measured by contact-free method involving inductance sensor with magnetic pulse field metre and registered when electronic memory cell is actuated in automatic test mode upon each passage of turn outputs of defective section and sections connected to it by equalisers under the inductance sensor; maximum levels of magnetic pulse field evolve only by current in turn-to-turn short circuit under effect of centrifugal force on winding and collector and of vibration on rotating armature only.EFFECT: detection of winding turn isolation fault leading to turn-to-turn short circuit under effect of centrifugal force on winding and collector and of vibration on rotating armature only.11 dwg