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

2010; Multidisciplinary Digital Publishing Institute; Volume: 10; Issue: 8 Linguagem: Inglês

10.3390/s100807874

1424-8220

Farid Zidat, Jean‐Philippe Lecointe, Fabrice Morganti, Jean-François Brudny, Thierry Jacq, Frédéric Streiff,

Magnetic Properties and Applications

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.