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Sensors 2010, 10(8), 7874-7895; doi:10.3390/s100807874

Non Invasive Sensors for Monitoring the Efficiency of AC Electrical Rotating Machines

1,2,* , 1,2
1 Univ Lille Nord de France, F-59000 Lille, France 2 UArtois, LSEE, F-62400 Béthune, France 3 EDF-R&D-Département THEMIS Groupe R25, F-92141 Clamart Cedex, France 4 ADEME-SEET Department-20, Av. Du Grésillé BP 90406, F-49004 Angers Cedex 01, France
* Author to whom correspondence should be addressed.
Received: 6 July 2010 / Revised: 9 August 2010 / Accepted: 12 August 2010 / Published: 23 August 2010


This paper presents a non invasive method for estimating the energy efficiency of induction motors used in industrial applications. This method is innovative because it is only based on the measurement of the external field emitted by the motor. The paper describes the sensors used, how they should be placed around the machine in order to decouple the external field components generated by both the air gap flux and the winding end-windings. The study emphasizes the influence of the eddy currents flowing in the yoke frame on the sensor position. A method to estimate the torque from the external field use is proposed. The measurements are transmitted by a wireless module (Zig-Bee) and they are centralized and stored on a PC computer.
Keywords: magnetic field sensors; efficiency diagnosis; AC electrical motors magnetic field sensors; efficiency diagnosis; AC electrical motors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Zidat, F.; Lecointe, J.-P.; Morganti, F.; Brudny, J.-F.; Jacq, T.; Streiff, F. Non Invasive Sensors for Monitoring the Efficiency of AC Electrical Rotating Machines. Sensors 2010, 10, 7874-7895.

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