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Sensors 2011, 11(3), 3356-3380; doi:10.3390/s110303356

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.
Received: 25 January 2011 / Revised: 28 February 2011 / Accepted: 10 March 2011 / Published: 21 March 2011
(This article belongs to the Section Physical Sensors)


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.
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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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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