Abstract
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.
Highlights
The energy consumption monitoring of electric rotating machinery has recently become a major problem
It is equipped of a coil in the air gap so that the external magnetic field component can be compared to the air gap field
This paper develops a non invasive method for a complete diagnosis of AC electrical machines
Summary
The energy consumption monitoring of electric rotating machinery has recently become a major problem. A motorized pump initially very well chosen might have, a few years later, a low efficiency if its flow is changed It highlights the importance and necessity of the on-line energy diagnosis of electrical machines and such a diagnosis can concern an entire fleet of electrical machines. The aim of this paper is to present a non invasive method to diagnose AC motor efficiency It leads to the conception of a cell which may be installed by non skilled technical staff. The information that the cell has to transmit makes it possible to achieve a complete energy diagnosis: the working time, the temperature, the number of starts, the effective torque, the power and so the speed and, at last, the efficiency. The simplicity of the magnetic flux sensors promotes their own energy consumption and provides to the application a real interest
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