Unlock instant, AI-driven research and patent intelligence for your innovation.

Cage type asynchronous motor rotor broken bar fault diagnosis method

A technology for asynchronous motors and rotor broken bars, which is applied in the direction of motor generator testing, measuring electricity, and measuring electrical variables, etc., can solve the problem of difficult diagnosis of broken rotor bars, and achieve the effect of low hardware cost

Active Publication Date: 2021-12-31
ZHEJIANG UNIV +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of difficult diagnosis of broken rotor bars based on signal processing, the present invention proposes a fault diagnosis method based on variable mode decomposition algorithm for analyzing starting current signals

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cage type asynchronous motor rotor broken bar fault diagnosis method
  • Cage type asynchronous motor rotor broken bar fault diagnosis method
  • Cage type asynchronous motor rotor broken bar fault diagnosis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The diagnosis method proposed by the present invention will be described below in conjunction with the accompanying drawings and simulation experiments.

[0051] Such as figure 1Shown, embodiment of the present invention and implementation thereof are as follows:

[0052] The experimental motor is a WE3-132M2-6 motor. Maxwell is used to build a motor model, and the parameters of the guide bar are set to simulate a healthy motor and a faulty motor with broken rotor bars. The process includes the following steps:

[0053] 1) Obtain the stator phase current data, and measure the motor speed to calculate the slip;

[0054] 2) Export the simulated current waveform and rotational speed waveform, and input them into Matlab for signal processing.

[0055] 2.1: Use the speed waveform to determine the end time of starting, that is, the starting process ends when the speed reaches the synchronous speed.

[0056] 2.2: Experiments have verified that the high-frequency part will ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a cage type asynchronous motor rotor broken bar fault diagnosis method. The method comprises: obtaining stator phase current in the whole starting process, performing anti-aliasing filtering processing, and measuring the rotating speed; inputting the current into the variable mode decomposition algorithm, and optimizing the variable mode decomposition algorithm; inputting the current into the optimized variable mode decomposition algorithm again to decompose an intrinsic mode function component, and calculating an instantaneous frequency; obtaining a slip ratio according to the rotating speed and then calculating a theoretical rotor broken bar fault frequency; and drawing respective curve graphs of actual and theoretical rotor broken bar fault frequencies along with time change in the starting process, calculating a mean square error between the two curve graphs, and comparing the mean square error with a preset error threshold value to carry out broken bar fault judgment. The non-invasive fault diagnosis method is realized, the hardware cost is low, the influence caused by spectrum leakage is reduced, and the rotor broken bar fault can be accurately identified.

Description

technical field [0001] The invention belongs to a fault detection method in the field of motor fault diagnosis, and in particular relates to a fault diagnosis method for broken bars of a cage-type asynchronous motor rotor. Background technique [0002] Asynchronous motors have been widely used due to their simple structure and low cost. However, harsh environments such as high humidity, strong vibration, extreme temperature, oil and dust, and human misoperation in the manufacturing and production process may cause motor failures. , The broken rotor bar fault is one of the typical faults of the squirrel-cage asynchronous motor. [0003] For cage-type asynchronous motor rotor broken bars, the main problem is that the early signal is not obvious and easily submerged by the fundamental signal, and the interference and vibration signals are easily confused with the fault signal. Therefore, the method of suppressing the conversion of the fundamental frequency component has attract...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/346
Inventor 史婷娜刘心悦胡凯波夏志凌阎彦张振张善盛隆
Owner ZHEJIANG UNIV