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Signal Injection as a Fault Detection Technique

MCIA Research Group, Universitat Politècnica de Catalunya, C. Colom 1, Terrassa, 08222 Catalunya, Spain
Author to whom correspondence should be addressed.
Sensors 2011, 11(3), 3356-3380;
Received: 25 January 2011 / Revised: 28 February 2011 / Accepted: 10 March 2011 / Published: 21 March 2011
(This article belongs to the Section Physical Sensors)
PDF [2188 KB, uploaded 21 June 2014]


Double frequency tests are used for evaluating stator windings and analyzing the temperature. Likewise, signal injection on induction machines is used on sensorless motor control fields to find out the rotor position. Motor Current Signature Analysis (MCSA), which focuses on the spectral analysis of stator current, is the most widely used method for identifying faults in induction motors. Motor faults such as broken rotor bars, bearing damage and eccentricity of the rotor axis can be detected. However, the method presents some problems at low speed and low torque, mainly due to the proximity between the frequencies to be detected and the small amplitude of the resulting harmonics. This paper proposes the injection of an additional voltage into the machine being tested at a frequency different from the fundamental one, and then studying the resulting harmonics around the new frequencies appearing due to the composition between injected and main frequencies. View Full-Text
Keywords: fault detection; induction motor; electrical drives fault detection; induction motor; electrical drives
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Cusidó, J.; Romeral, L.; Ortega, J.A.; Garcia, A.; Riba, J. Signal Injection as a Fault Detection Technique. Sensors 2011, 11, 3356-3380.

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