Influence of Manufactory Asymmetrical Squirrel Rotor on Motor Current Responses

Haiyang Li, Xiuquan Sun, Fengshou Gu, Andrew D. Ball

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


In current spectrum, the spectral sidebands at (1 ± 2ks)fs (s is rotor slip, k represents integer and fs is the fundamental supply frequency) are commonly used as the indicator of bar faults in induction motors (IMs). A symmetrical rotor should not show any peak at such frequencies. However, in the current spectrum of most of healthy IMs, the sidebands at (1 ± 2ks)fs also show observable peaks. That should be caused by the rotor machining error. Although the manufacturers try their best to reduce the asymmetricity degree to guarantee the rotor is balanced, the asymmetricity rotor still cannot be avoided. Although the sideband peak value increases along with the bar breakage level, it still hard work to recognize whether the IM diagnosed is with only machining error or with more breakage. To study how machining errors affect the rotor current and stator current and what kind of machining error factors will result in the fluctuation of sidebands peaks. Current model of symmetrical rotor, asymmetrical rotors with three level machining errors and with multiple breakage bars are investigated numerically. The results show the level of machining errors and the positions of the errors affect the sideband peak values significantly. These novel findings will provide foundation for accurate diagnosis of motor rotor health conditions.

Original languageEnglish
Title of host publication2021 26th International Conference on Automation and Computing
Subtitle of host publicationSystem Intelligence through Automation and Computing, ICAC 2021
EditorsChenguang Yang
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781860435577
ISBN (Print)9781665443524
Publication statusPublished - 15 Nov 2021
Event26th International Conference on Automation and Computing - University of Portsmouth, Portsmouth, United Kingdom
Duration: 2 Sep 20214 Sep 2021
Conference number: 26


Conference26th International Conference on Automation and Computing
Abbreviated titleICAC 2021
Country/TerritoryUnited Kingdom
Internet address


Dive into the research topics of 'Influence of Manufactory Asymmetrical Squirrel Rotor on Motor Current Responses'. Together they form a unique fingerprint.

Cite this