Affiliations: [a] Pukyong National University, Yong dang dong, Nam gu,
Busan, South Korea | [b] KETI Yakdae dong, Wonmi gu, Bucheon, Gyeonggi do,
South Korea
Correspondence:
[*]
Corresponding author: Kyungil Woo, Pukyong National University,
Yongdang dong, Nam gu, Busan, South Korea. Tel.: +82 51 629 6321; Fax: +82 51
629 6305; E-mail: cogging@pknu.ac.kr
Abstract: This paper studies on the fault analysis of 3-phase cage induction
motor with the mixed fault of the static eccentricity and the broken rotor bars
at steady state. A mathematical fault model is presented by the coupled
magnetic circuit approach. The calculation of winding inductances is derived by
means of a winding function theory. The stator current and the torque are
obtained by means of the coupled magnetic circuit method and Park's
transformation. The characteristics of single fault and mixed fault are
analyzed. From the simulation results it is shown that there is its own
peculiar frequency component obtained by the spectrum analysis of the stator
current in the case of a single fault. But in the case of mixed fault, there is
a mutual effect between two faults. From the comparison with FEM results, it is
shown that the proposed approach can be simulated to diagnose faults in 3-phase
cage induction motor.
Keywords: Broken rotor bars, coupled magnetic circuit, static eccentricity, winding function theory
