Cage type asynchronous motor stator winding turn-to-turn short circuit fault identification method

A technology for inter-turn short-circuit faults and asynchronous motors. It is applied in the direction of motor generator testing, measuring electricity, and measuring electrical variables. It can solve problems such as the inability to automatically identify motor fault types, and achieve intuitive results and low hardware costs.

Inactive Publication Date: 2020-01-21
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem that the motor fault type cannot be automatically identified in the motor fault detection me

Method used

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  • Cage type asynchronous motor stator winding turn-to-turn short circuit fault identification method
  • Cage type asynchronous motor stator winding turn-to-turn short circuit fault identification method
  • Cage type asynchronous motor stator winding turn-to-turn short circuit fault identification method

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Experimental program
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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and motor detection examples.

[0039] figure 2 The schematic diagram of the test bench. The experimental motor is Y90S-4 induction motor, its technical parameters are shown in Table 1, and it is equipped with multi-tap stator windings. Experiments were carried out under the conditions of normal motor and phase A short circuit of 10 turns respectively.

[0040] Table 1 Motor Technical Parameters

[0041]

[0042] The specific operation process is as follows:

[0043] Step 1: Collect the three-phase stator current of the motor:

[0044] Use 3 current clamps to directly clamp the three-phase terminals of the stator winding to measure the instantaneous current signal of the stator, and then collect the stator current data through the NI acquisition card, change the motor load, and collect the current data of the motor under various load intensities. The sampling fre...

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Abstract

The invention discloses a cage type asynchronous motor stator winding turn-to-turn short circuit fault identification method. First, a three-phase stator current instantaneous signal is measured, andthe current signal is analyzed by using a Park vector method, to obtain a Park vector track chart. Then, a direction gradient histogram method is used to extract an image feature of a Park vector track, to form a feature vector. Finally, the extracted feature vector is input into a random forest model for motor fault classification, to obtain an identification result of a motor fault. The invention can not only accurately identify a stator winding turn-to-turn short circuit fault, but also solve a problem of an artificial identification motor stator winding turn-to-turn short circuit fault.

Description

technical field [0001] The invention relates to a method for identifying a short-circuit fault between turns of a stator winding of a cage-type asynchronous motor, and belongs to the field of motor fault diagnosis. Background technique [0002] Asynchronous motors have many advantages, such as simple structure, long life and low production cost, so the application range of asynchronous motors is very wide. However, the operating environment of the motor is relatively harsh, and the inter-turn insulation is prone to aging and damage, and then the inter-turn short circuit fault of the stator winding occurs. The occurrence rate of this fault accounts for about 30% of all motor faults. [0003] Turn-to-turn short-circuit faults in stator windings are typical progressive faults, and their continuous development will lead to serious faults such as phase-to-phase short-circuits. Therefore, it is particularly important to detect inter-turn short-circuit faults in motor stator windin...

Claims

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Application Information

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IPC IPC(8): G01R31/34
CPCG01R31/346
Inventor 王攀攀张阳徐泽涵高利强童志刚卢俊结许浩孙绍峰高志宇
Owner CHINA UNIV OF MINING & TECH
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