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Motor rotor broken bar fault detection method and system based on fusion correlation spectrum

A technology for motor rotor and fault detection, which is used in motor generator testing, machine/structural component testing, and electrical measurement. The effect of fundamental frequency leakage

Active Publication Date: 2021-01-22
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0005] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides a method and system for detecting a broken bar fault of a motor rotor based on a fusion correlation spectrum. Problems with very small components that are difficult to identify and detect

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  • Motor rotor broken bar fault detection method and system based on fusion correlation spectrum
  • Motor rotor broken bar fault detection method and system based on fusion correlation spectrum
  • Motor rotor broken bar fault detection method and system based on fusion correlation spectrum

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0053] The structure and working principle of the motor rotor broken bar fault detection method and system based on fusion correlation spectrum provided by the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0054] figure 1 They are schematic diagrams of a method for detecting a motor rotor broken bar fault based on fusion c...

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Abstract

The invention discloses a motor rotor broken bar fault detection method and system based on a fusion correlation spectrum. The method comprises the steps: collecting a first stator current signal anda first vibration signal of a to-be-recognized diagnosis motor in a preset time interval in real time, and carrying out Hilbert transform of the first stator current signal and the first vibration signal so as to obtain a stator current modulus signal and a vibration modulus signal; filtering direct-current components in the stator current modulus signal and the vibration modulus signal to obtaina second stator current signal and a second vibration signal, and performing fusion correlation spectrum analysis on the second stator current signal and the second vibration signal to obtain a fusioncorrelation spectrogram; and judging whether the motor has a broken bar fault or not by utilizing the obtained fusion correlation spectrogram, and judging that the motor rotor has a broken bar faultat present if the fusion correlation spectrogram has 2sf0 and a fault component spectral peak of frequency multiplication of the 2sf0, wherein s is a slip ratio of the motor, and f0 is a fundamental frequency.

Description

technical field [0001] The invention belongs to the technical field of motor fault identification, and more specifically relates to a method and system for detecting motor rotor broken bar faults based on fusion correlation spectrum. Background technique [0002] Asynchronous motor is a kind of AC motor, also known as induction motor, which is mainly used as a motor. When the stator winding of the asynchronous motor is connected to the three-phase symmetrical AC power supply, the three-phase symmetrical current will flow in the stator winding, and the fundamental rotating magnetomotive force will be established in the air gap, thereby generating the fundamental rotating magnetic field. The rotor winding conductor cuts the rotating magnetic field to generate an induced electromotive force, which generates a corresponding current in the rotor winding. The rotor current interacts with the rotating magnetic field in the air gap to generate electromagnetic torque, which drives t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01R31/34
CPCG01M7/02G01R31/343
Inventor 杨凯张雅晖李天乐徐蕴镠徐百川
Owner HUAZHONG UNIV OF SCI & TECH
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