Magnetic field detection-based synchronous motor static excitation device fault diagnosis method

Abstract

The invention discloses a magnetic field detection-based synchronous motor static excitation device fault diagnosis method, which is used for solving the problem of detection of a synchronous motor static excitation device fault. The technical scheme is that: in the method, a magnetic signal in a pulse magnetic flux loop of the synchronous motor is acquired on line by a detecting coil, and is displayed and analyzed by a data acquisition instrument, if the signal contains periodic shock pulse or the density of the shock pulse is suddenly increased, a bad contact fault is present between a carbon brush and a collecting ring. The method is simple and practicable, high in reliability and wide in application range, can make maintenance personnel timely discover and treat the synchronous motor static excitation device fault, and guarantees normal operation of the synchronous motor.

Description

technical field [0001] The invention relates to a method capable of diagnosing whether a synchronous motor has a static excitation device failure on-line, and belongs to the technical field of testing. Background technique [0002] The failure of static excitation device is a common failure of synchronous motors, usually including problems such as improper pressing force of carbon brushes, looseness, eccentricity, bumps or burns, etc. Such failures will cause poor contact between carbon brushes and collector rings, and vibration chatter, and then generate hot spots, causing damage to the surface of the collector ring. It may further burn out the carbon brushes, brush holders and collector rings, causing faults such as grounding of the rotor at one point and loss of magnetism. At present, there is no effective online detection method for faults of static excitation devices. The problem can only be found through regular visual inspection. Such measures cannot find faults in t...

AI Technical Summary

Problems solved by technology

[0002]The failure of the static excitation device is a common failure of the synchronous motor, usually including problems such as improper pressing force of the carbon brush, looseness, eccentricity, bumps or burns, etc. It will cause poor contact between the carbon brush and the collector ring, and vibration will occur, which will cause hot spots and damage the surface of the collector ring. In severe cases, the collector ring will fire, resulting in unstable excitation voltage and current, and system power fluctuations. If the fault is not dealt with in a timely and effective manner, the carbon brush, brush holder and collector ring may be further burned, resulting in faults such as grounding of the rotor at one point and loss of magnetism.

At present, there is no effective online detection method for the fault of the static excitation device. The problem can only be found through regular visual inspection. Such measures cannot find the fault in time

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