Motor rotor classical failure diagnosis method based on low subharmonic shaft voltage signals

A technology of motor rotor and diagnosis method, which is applied in the field of testing, can solve problems such as difficult detection, mass imbalance and dynamic eccentricity, and no theoretical support, and achieve the effects of broad application prospects, high diagnostic reliability, and simple operation
CN101694508BInactive Publication Date: 2011-08-24NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2011-08-24
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a motor rotor classical failure diagnosis method based on low subharmonic shaft voltage signals, which is used for solving the detection problem of turn-to-turn short circuit failure of a motor rotor static eccentricity and a winding. The technical scheme is achieved as follows: respectively connecting two ends of a slide rheostat to two ends of a motor rotor; acquiring shaft voltage partial signals output by the slide rheostat in an on-line way by using a data acquisition device; carrying rapid Fourier transform on the signals to obtain a shaft voltage frequency spectrum plot; and analyzing the frequency spectrum of the shaft voltage signals, diagnosing whether the turn-to-turn short circuit failure exists in the motor rotor winding or not: if the frequency component amplitude of j Omega r / 2Pi in the shaft voltage signals exceeds 15 percent of the normal value, judging the turn-to-turn short circuit failure exists in the motor rotor winding, wherein Omega r is the mechanical angular velocity of the motor. The invention has high diagnosis reliability, simple operation and low cost, is suitable for a non-salient pole sychronous motor and a salient pole synchronous motor, and can conveniently perform the test whatever the motor is big, small, new or old.
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Description

technical field

[0001] The invention relates to a method capable of diagnosing on-line whether there are typical faults such as inter-turn short circuit in the rotor winding of a synchronous motor, belonging to the technical field of testing. Background technique

[0002] Turn-to-turn short circuit fault of rotor winding is a common fault of synchronous motor. There are various diagnosis methods for inter-turn short circuit faults, which can be generally divided into two categories, namely offline diagnosis methods and online diagnosis methods. Among them, the online diagnosis method can detect the fault in real time and prevent it from further deterioration, which is the trend of future development.

[0003] At present, the methods for online detection of inter-turn short-circuit faults in rotor windings mainly include detection coil method, excitation current method and detection method based on rotor fundamental frequency vibration.

[0004] The basic principle of the d...

Claims

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