Characteristics Analysis on the Effects of Rotor Eccentricity in Squirrel-cage Induction Motor

회전자 편심을 고려한 농형 유도전동기의 특성해석

  • 김미정 (동아대 공대 전기공학과) ;
  • 김병국 (동아대 공대 전기공학과) ;
  • 황돈하 (한국전기연구원 산업전기연구단) ;
  • 강동식 (한국전기연구원 전력설비진단연구그룹) ;
  • 조윤현 (동아대학교 전기공학과)
  • Published : 2007.02.01

Abstract

This paper describes the effects of rotor eccentricity in squirrel cage induction machines. Asymmetric electro-magnetic force caused by the frictional worn bearing, rotor misalignment and unbalanced rotor etc. generates an asymmetrical operation, vibration and electro-magnetic noise. The need for detection of these rotor eccentricities has pushed the development of monitoring methods with increasing sensitivity and noise immunity. In this paper, we focus on investigating the asymmetrical operation considering of unbalanced magnetic pull in squirrel-cage induction motor with 380 [V], 7.5 [kW], 4P, 1,768 [rpm]. The effects of the non-symmetric rotor and magnetic force are simulated by finite element method (FEM) and tested using search coils for measuring the actual air-gap flux.

Keywords

References

  1. Don-Ha Hwang, et al., 'A Method for Dynamic Simulation and Detection of Air-gap Eccentricity in Induction Motors by Measuring Flux Density', IEEE CEFC 2006, Miami, USA, Paper No. PA7-7, April 30th - May 3rd 2006
  2. 황돈하 外, '유도전동기의 회전자 진동에 따른 공극의 자속변화 해석', 2004, 대한전기학회 전기기기 및 에너지변환시스템부문회 춘계학술대회 논문집, pp 62-64
  3. Subhasis Nandi et al, 'Condition Monitoring and Fault Diagnosis of Electrical Motors-A Review', IEEE Trans. on Energy conversion, Vol. 20, No 4, pp. 719-729, 2005 https://doi.org/10.1109/TEC.2005.847955
  4. W.T. Thosom and M. Fenger, 'Industrial Application of Current Signature Analysis to Diagnose Faults in 3-Phase Squirrl Cage Induction Motors', Conference Record of 2000 Annual Pulp and Paper Industry Technical Conference, pp. 205-211, 2000
  5. O.V. Thorsen and M. Dalva, 'Method of Condition Monitoring and Fault Diagnosis for Induction Motors', ETEP, Vol. 8, No.5, pp. 383-395, 1998
  6. H.A. Toliyat, et al., 'A Method for Dynamic Simulation and Detection of Air-Gap Eccentricity in Induction Machines', IEEE Trans. on Industry Applications, Vol. 32, No.4, pp. 910-918, Jul./Aug. 1996 https://doi.org/10.1109/28.511649
  7. D.H. Hwang, et al., 'Analysis of a Three Phase Induction Motor under Eccentricity Condition', IEEE IECON 2005, North Carolina, USA, pp. 2609-2613, Nov. 6-10, 2005
  8. 황돈하 外, '유도전동기의 편심에 의한 회전자 진동해석', 2005, 대한전기학회 하계 학술대회 논문집(B), pp. 1201-1203 2005.7.18-20
  9. A. Tenhunen, et al., 'Spatial Linearity of Unbalanced Magnetic Pull in Induction Motors during Eccentric Rotor Motions', 15th International Conference on Electrical Machines (ICEM 2002), Bruges, Belgium, Vol. 1, pp. 330-335, Aug. 25-28, 2002