Dissertation > Excellent graduate degree dissertation topics show

Fault Diagnosis of Broken Rotor Bars Based on the Steady-state Stator Current

Author: LiHongXia
Tutor: YeDaPeng；ZhangXiang
School: Fujian Agriculture and Forestry University
Course: Mechanical Design and Theory
Keywords: Broken rotor bars Hilbert transform Fault diagnosis Wavelet packet decomposition Stator current analysis
CLC: TM346
Type: Master's thesis
Year: 2009
Downloads: 103
Quote: 1
Read: Download Dissertation

Abstract


Induction motor is widely used in industrial areas for its simple structure, low cost, small amount of maintenance. However, with the rapid development of the modern industrial system, the capacity of single motor increases gradually, and the load becomes more and more complex, which cause that fault often occurs during motor operation. The motor failure will not only damage the motor itself, but also make the motor disabled and result in the collapse of the production line, which causes huge economic losses and disastrous consequences. Studies show that induction motor broken rotor broken bars fault is a main type of the failures, with a percentage of 5% -10% of the total failures. So the correct diagnosis of the broken rotor bars fault has a great significance on the industrial production.This paper discuss the principle of fault diagnosis of broken rotor bars and describes that there are some characteristics appear in the steady-state stator current when it has broken bars faults. The steady-state stator current simulation models for different noise level are established by assigning steady-state stator current as analysis object. Firstly, the stator current is made by Hilbert-transform, and then the DC component is removed by using double Hilbert-transform. Thirdly, the features are extracted by applying 3 levels wavelet packet decomposition. Finally the faults are identified by using BP neural network. The simulation results show that: the recognition rate exceed 90% by using Hilbert and wavelet packet combination in different noise level.A fault diagnosis experimental system is built for broken rotor bars by setting the J02-12-2 induction motor as the research object and using the signal acquisition instrument INV306U intelligent platform in the paper. The steady-state stator current data are collected for broken and normal mode rotor in this experiment. Combining application of VC + +6.0 and Matlab engine, comparison analysis is achieved through time domain, frequency domain, wavelet packet, and Hilbert and wavelet packet combination. Experimental results show that: the rotor broken bar recognition rate is up to 92.5% by using Hilbert and wavelet packet combining method.

Related Dissertations

  1. Design and Development of Application Programme for Fault Analyzer Based on Wince Platform,TP311.52
  2. Research on the 6-Dof Fault Tolerant Control of the Vibration Isolation Platform with Eight Actuators,TB535.1
  3. Fault Diagnosis Method Based on Support Vector Machine,TP18
  4. Fault Diagnosis Research on Three-Tank System,TP277
  5. Research on the Key Technology of Waterborne Transport Security System,U698
  6. The overall design and system development RTAD-CMDMDES of,U279.3
  7. Based on Fuzzy Neural Network Fault Diagnosis of Expert Systems,TP183
  8. Fault Diagnosis Method Study of Hydraulic System of Concrete Pump,TU646
  9. Optical Hilbert Transform Based on Fiber Bragg Gratings,TN253
  10. Development of Fault Diagnosis System for Turbine Shaft Based on Neural Network,TK267
  11. Uncertain Information Fusion Method Based on Random Sets and Application on Fault Diagnosis of Wind Turbine Generators,TM315
  12. The Fault Diagnosis of Wind Turbine Gearbox Based on LSSVM of Parameter Optimization and Improved PSO,TM315
  13. Research on Condition Monitoring and Fault Diagnosis of Wind Turbine Driving Chain Based on Vibration Method,TM315
  14. Time-varying Outage Model and Fault Diagnosis of Oil Immersed Transformers Based on DGA,TM411
  15. Remote logging sensor fault diagnosis system,TP212
  16. The Fault Diagnosis System of Sucker-rod Pumping Wells Based on Analysis of Pumping Card,TE355.5
  17. Design and Application of State Monitoring and Fault Diagnosis System for Centrifugal Compressor,TQ056
  18. The Break-bar Fault Diagnostics of the Asynchronous Motors Based on Variable Frequency Drives,TM343
  19. Research on Problems of Pumping-jack Diagnosis Based on Support Vector Machine,TP18
  20. The Study and Design of Fault Diagnosis System Based on Condition Monitoring for 27 Meters Mobile Aerial Working Platform of Straight Arm,TH165.3
  21. The Application Research of Data Mining to Shield Fault Diagnosis,TP311.13

CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
© 2012 www.DissertationTopic.Net  Mobile