Open AccessInvestigation of wound rotor induction machine vibration signal under stator electrical fault conditions
Author(s) -
Djurović Sinisa,
VilchisRodriguez Damian S.,
Smith Alexander Charles
Publication year - 2014
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2014.0116
Subject(s) - stator , vibration , rotor (electric) , torque , fault (geology) , signal (programming language) , control theory (sociology) , wound rotor motor , engineering , frame (networking) , induction motor , computer science , acoustics , physics , electrical engineering , mechanical engineering , voltage , control (management) , artificial intelligence , seismology , geology , thermodynamics , programming language
This paper investigates wound rotor induction machine torque and vibration signals spectra for operation with and without a stator short‐circuit or open‐circuit winding fault. Analytical expressions that enable the healthy and faulty machine pulsating electromagnetic torque frequencies to be related to shaft speed are derived and validated for operating conditions of interest. A coupled‐circuit machine model is used to investigate the healthy and faulty electromagnetic torque signal. Shaft torque and stator frame vibration are measured on a laboratory test rig comprising a 30 kW wound rotor induction machine. It is shown that the existence of a stator winding inherent electrical unbalance or that arising from fault gives rise to a range of pulsating torque frequencies that are transmitted to the machine frame and can be detected in the measured vibration signal. The magnitudes of the resulting vibration components are demonstrated to be largely determined by the unbalance severity and the mechanical system response. The presented experimental results clearly validate the analytical and simulation analysis for the operating range of the investigated industrial machine design.