Simulation for detecting air-gap eccentricity in a three-phase induction motor

C. H. Lee, W. J. Liang, S. H. Hsu

Research output: Contribution to journalArticlepeer-review

Abstract

Owing to the gradual depletion of oil and a concern for environmental protection, motors have become the drive system of the future instead of the combustion engine. Among various types of motors, induction motors are often used due to their simple structure, fast reaction, and powerful propulsion force. Thus, the safe operation of motor vehicles is a major concern with the trends in the online fault monitor. However, the accuracy of online monitoring is the most difficult task. Generally, the motor failures caused by electric and mechanical parts may occur mainly in stator, bearing and rotor. Among mechanical faults, 80% of relevant troubles may cause the phenomenon of air-gap eccentricity, leading to the power factor decreasing, motor vibrations, power losses and enlargement of the fault area. Particularly, it may result in the rotor and stator sides to craft each other in a serious situation. If one can detect motor faults in advance, maintenance schedule or parts replacement can be properly arranged to reduce the risk of suddenly shut down in motor operation. This paper simulates the differences of the characteristics of electric current signals for a 30 kW, four-pole, three-phase induction motor under normal condition, uneven dispose fault and air-gap eccentric fault using Matlab/Simulink. To verify the feasibility of the models developed in the Matlab/Simulink environment, the simulated fault signals are compared with the results obtained by other research. Finally, this paper shows that the air-gap eccentricity degree can rapidly and reliably be diagnosed without transforming the fault signals into the frequency domain instead of analyzing them with a neural algorithm.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalJournal of Taiwan Society of Naval Architects and Marine Engineers
Volume31
Issue number1
Publication statusPublished - 2012 Feb

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Mechanical Engineering

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