Cage type asynchronous motor stator and rotor fault joint diagnosis method based on stack type self-encoding and light gradient elevator algorithm

Abstract

The invention discloses a cage type asynchronous motor stator and rotor fault joint diagnosis method based on stack type self-encoding and a light gradient elevator algorithm. The method comprises the following steps: firstly carrying out the fast Fourier decomposition of a stator current instantaneous signal collected according to a certain frequency, and extracting the fault-related 20-dimensional feature quantity of each sample; then encoding the data through a stack type auto-encoder to realize automatic feature extraction; and inputting the coded data into a light gradient elevator classifier to carry out motor state multi-classification so as to diagnose fault types and severity. Manual feature extraction and manual intervention are not needed in the signal processing process, and meanwhile part of noise can be restrained through noise reduction self-coding. The classifier selects an optimization algorithm light gradient elevator algorithm based on a decision tree, the performance of structured data is superior to that of a deep neural network, the training time of the unit cycle index is the shortest on the premise that the highest precision is guaranteed, and the whole process code can be packaged and stored for subsequent training and practical application.

Description

technical field [0001] The invention relates to a method based on a stacked self-encoder and a light gradient hoisting machine algorithm, which can jointly and simultaneously diagnose the stator and rotor faults of a cage-type asynchronous motor, and belongs to the technical field of detection. Here, the stator fault refers to the inter-turn short circuit fault of the stator winding, and the rotor fault refers to the rotor broken bar fault. Background technique [0002] Cage asynchronous motors are widely used in the field of electrical transmission. Since the insulation of the stator winding may be scratched or scratched during the manufacturing and installation process, and the working environment and mechanical, electromagnetic and other reasons cause vibration and friction to damage the insulation, the stator winding turns of the cage-type asynchronous motor may occur during operation. short circuit fault. In addition, because the rotor bar is subjected to alternating ...

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