In-service monitoring of stator slot magnetic wedge condition for induction motors

Sangwoo Han; Junyeong Jung; Kun Wang Lee; Sang Bin Lee; Subhasis Nandi; Byunghwan Kim; Byunghee Kang

doi:10.1109/ECCE.2015.7310633

In-service monitoring of stator slot magnetic wedge condition for induction motors

Sangwoo Han, Junyeong Jung, Kun Wang Lee, Sang Bin Lee, Subhasis Nandi, Byunghwan Kim, Byunghee Kang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Stator slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly reported. Although missing wedges can deteriorate motor performance and reliability, there currently is no test method accepted in the field for wedge quality assessment other than off-line, disassembled visual inspection. In this paper, a new in-service method for monitoring the magnetic wedge condition in induction motors based on the negative sequence information is proposed. The new method is developed based on the analysis of the dynamic model of the induction motor with missing magnetic slot wedges, derived in this paper. The proposed method is verified experimentally on a 380 V, 5.5 kW induction motor with custom-built magnetic wedges, and on a finite element model of a 6.6 kV, 1850 kW induction motor. It is shown that the proposed method can provide on-line detection of missing magnetic wedges, which can help reduce maintenance costs and risk of degradation in motor performance.

Original language	English
Title of host publication	2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	6948-6955
Number of pages	8
ISBN (Electronic)	9781467371506
DOIs	https://doi.org/10.1109/ECCE.2015.7310633
Publication status	Published - 2015 Oct 27
Event	7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015 - Montreal, Canada Duration: 2015 Sept 20 → 2015 Sept 24

Publication series

Name	2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015

Other

Other	7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015
Country/Territory	Canada
City	Montreal
Period	15/9/20 → 15/9/24

Bibliographical note

Funding Information:
This work was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2013R1A1A 2010370) and in part by the Human Resources Development program (20134030200340) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

Publisher Copyright:
© 2015 IEEE.

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1109/ECCE.2015.7310633

Cite this

Han, S., Jung, J., Lee, K. W., Lee, S. B., Nandi, S., Kim, B., & Kang, B. (2015). In-service monitoring of stator slot magnetic wedge condition for induction motors. In 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 (pp. 6948-6955). Article 7310633 (2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2015.7310633

In-service monitoring of stator slot magnetic wedge condition for induction motors. / Han, Sangwoo; Jung, Junyeong; Lee, Kun Wang et al.
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015. Institute of Electrical and Electronics Engineers Inc., 2015. p. 6948-6955 7310633 (2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Han, S, Jung, J, Lee, KW, Lee, SB, Nandi, S, Kim, B & Kang, B 2015, In-service monitoring of stator slot magnetic wedge condition for induction motors. in 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015., 7310633, 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015, Institute of Electrical and Electronics Engineers Inc., pp. 6948-6955, 7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015, Montreal, Canada, 15/9/20. https://doi.org/10.1109/ECCE.2015.7310633

Han S, Jung J, Lee KW, Lee SB, Nandi S, Kim B et al. In-service monitoring of stator slot magnetic wedge condition for induction motors. In 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015. Institute of Electrical and Electronics Engineers Inc. 2015. p. 6948-6955. 7310633. (2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015). doi: 10.1109/ECCE.2015.7310633

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abstract = "Stator slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly reported. Although missing wedges can deteriorate motor performance and reliability, there currently is no test method accepted in the field for wedge quality assessment other than off-line, disassembled visual inspection. In this paper, a new in-service method for monitoring the magnetic wedge condition in induction motors based on the negative sequence information is proposed. The new method is developed based on the analysis of the dynamic model of the induction motor with missing magnetic slot wedges, derived in this paper. The proposed method is verified experimentally on a 380 V, 5.5 kW induction motor with custom-built magnetic wedges, and on a finite element model of a 6.6 kV, 1850 kW induction motor. It is shown that the proposed method can provide on-line detection of missing magnetic wedges, which can help reduce maintenance costs and risk of degradation in motor performance.",

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In-service monitoring of stator slot magnetic wedge condition for induction motors

Abstract

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Bibliographical note

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