Instantaneous angular speed monitoring of electric motors

Ahmed Yousef Ben Sasi, Fengshou Gu, Bradley Payne, Andrew Ball

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


This research presents the theory and implementation detail for the extraction of angular speed variations. In particular, bandpass filtering, frequency shifting and analytic representation are addressed with simple mathematical equations. Finally, some case studies on a 3kW induction motor are investigated for healthy and faulty conditions. Some vital key features and characteristics can be extracted from the angular speed variations. Pole pass speed side bands around the rotor speed can be used as a feature for broken rotor bar faults. The number of poles multiplied by the synchronous running speed cycles and the rise of 100 Hz components are key characteristics for voltage imbalance faults.

Original languageEnglish
Pages (from-to)123-135
Number of pages13
JournalJournal of Quality in Maintenance Engineering
Issue number2
Publication statusPublished - 30 Aug 2004
Externally publishedYes


Dive into the research topics of 'Instantaneous angular speed monitoring of electric motors'. Together they form a unique fingerprint.

Cite this