Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM

A technology of rotor broken bars and diagnosis method, which is applied in the field of fault diagnosis and can solve problems such as the deviation of the number of broken bars

Pending Publication Date: 2022-01-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] At present, the analysis method of the instantaneous reactive power signal of the motor has provided a diagnostic formula for the number of broken ba

Method used

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  • Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM
  • Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM
  • Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM

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Embodiment Construction

[0103] The present invention proposes a method for diagnosing the number of broken bars of a 15-phase asynchronous motor rotor based on ESPRIT-PSA and LGBM, and the diagnostic accuracy of the method is as high as 99.38%. The feature of the present invention is to apply ESPRIT-PSA to instantaneous reactive power fault component amplitude A q The extraction of and LGBM-based model training are described in detail below.

[0104] figure 1 Wiring diagram for the experiment. Among them, the experimental motor is a fifteen-phase asynchronous motor with a rated voltage of 380V, a rated power of 5.5kW and a rated frequency of 50Hz. In order to carry out the rotor broken bar test, in addition to the normal rotor, two faulty rotors (drilled on the guide bar at a distance of 10 mm from the end ring, with a depth of 15 mm and a diameter of 10 mm) are used to simulate the broken bar fault. There is one broken bar and two consecutive broken bars in the two faulty rotors respectively. Th...

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Abstract

The invention relates to a Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM. According to the method, for an instantaneous reactive power signal sampled in a short time (only 2 seconds), an accurate amplitude Aq of a characteristic component in the instantaneous reactive power signal is obtained by using an ESPRIT (Rotation Invariant Signal Parameter Estimation Technology) and a PSA (Pattern Search Algorithm); corresponding 71 characteristics such as voltage amplitude, current amplitude, average active power P and average reactive power Q are obtained; the method then includes determining Aq and the first five features, namely Aq, P and Q, a first phase voltage amplitude Um and a first phase current amplitude Im, in the 71 features according to an LGBM (Light Gradient Elevator) so as to form a data set, wherein the first five features include Aq, P and Q, and the first phase voltage amplitude Um and the first phase current amplitude Im; and then training and storing an LGBM model and carrying out high-precision diagnosis on the number of broken bars of the rotor (the training precision and the test precision are both 100%, and the five-fold cross validation accuracy is 99.38%).

Description

technical field [0001] The invention relates to a method capable of diagnosing the number of broken bars of a fifteen-phase asynchronous motor rotor, which belongs to the technical field of fault diagnosis. Background technique [0002] Because of its high reliability, fault-tolerant operation and many other advantages, fifteen-phase asynchronous motors have been used in special fields such as ships and submarines. Broken rotor bar is a typical failure mode of fifteen-phase asynchronous motor, so the fault diagnosis of broken rotor bar plays an important role in improving the reliability of fifteen-phase asynchronous motor operation. [0003] When a fifteen-phase asynchronous motor has broken rotor bars, it will appear in its stator current with a frequency of (1±2s)f 1 (s is the slip rate, f 1 is the side frequency component of the power supply frequency). The method for diagnosing the broken rotor bar by examining the side frequency component is called the motor stator ...

Claims

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Application Information

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IPC IPC(8): G06K9/62G06N20/00G01R31/34
CPCG06N20/00G01R31/343G01R31/346G06F18/24323
Inventor 许伯强孙丽玲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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