Affiliations: [a] School of Electrical Engineering and Automation, Hefei
University of Technology, Hefei, Anhui, China
Correspondence:
[*]
Corresponding author: Xiaohua Bao, School of Electrical
Engineering and Automation, Hefei University of Technology, Hefei 230009,
Anhui, China. Tel.: +86 0551 6290 5883; Fax: +86 0551 6290 4435; E-mail: sukz@ustc.edu
Abstract: This paper presents a multi-position magnetic field measurement
approach to detect air-gap eccentricity in induction machines, including
static, dynamic and mixed eccentricity. Using this method, the position of
minimum air gap of static eccentricity also can be detected. The sideband
components around the fundamental frequency of magnetic flux leakage in stator
yoke is particularly analyzed based on magnetic circuit. The magnitudes of
induced voltage harmonics in search coils are also investigated by finite
element method. The algorithm is implemented for a 4-pole three-phase cage
induction machine with static, dynamic and mixed eccentricity. It is
highlighted that dynamic eccentricity can be detected by any one of the search
coils, static eccentricity and the position of minimum air gap can be detected
by the magnitudes of induced voltages in all the search coils. The theoretical
results have been validated by finite element method.
Keywords: Eccentricity, fault detection, induction machines, magnetic field measurement
