Off-line flux injection test probe for screening defective rotors in squirrel cage induction machines

Myung Jeong, Jangho Yun, Yonghyun Park, Sang Bin Lee, Konstantinos Gyftakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The recent trend in squirrel cage induction motor manufacturing is to replace fabricated copper rotors with aluminum die-cast rotors to reduce manufacturing cost to stay competitive in the global market. Porosity in aluminum die-cast squirrel cage rotors is inevitably introduced during the die cast process. Porosity can cause degradation in motor performance and can lead to a forced outage causing irreversible damage if it is extreme. Many off-line and on-line quality assurance test methods have been developed and applied for assessment of rotor quality. However, years of experience with the existing test methods revealed that they are not suitable for quality testing or capable of providing a quantitative assessment of rotor condition with sufficient sensitivity. In this paper, a new off-line test method capable of providing sensitive assessment of rotor porosity is proposed. It is shown that rotors with minor and distributed porosity that are difficult to detect with other tests can be screened out during manufacturing. The proposed method is verified through a 3 dimensional finite element analysis and experimental testing on closed and semi-open slot aluminum die cast rotors of 5.5 kW induction motors with porosity.

Original languageEnglish
Title of host publicationProceedings of the 2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages233-239
Number of pages7
ISBN (Electronic)9781509004096
DOIs
Publication statusPublished - 2017 Oct 6
Event11th IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2017 - Tinos, Greece
Duration: 2017 Aug 292017 Sep 1

Publication series

NameProceedings of the 2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2017
Volume2017-January

Conference

Conference11th IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2017
CountryGreece
CityTinos
Period17/8/2917/9/1

Keywords

  • Aluminum Die-cast Rotor
  • Fault Detection
  • Induction Machines
  • Porosity
  • Quality Assurance
  • Squirrel Cage Rotor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

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