Abstract
This work is supported by a company wishing to develop new products in the field of energy monitoring in industry. It concerns the real-time estimation of the electrical consumption of an asynchronous motor without electrical measurement. The challenge consists of estimating the characteristic quantities of the motor (speed, torque, powers, efficiency) with only one vibratory measurement, information on the nameplate and commercial documentation available online. To obtain a real-time estimate, traditional FFT analysis is replaced by a PLL initially designed for power grid analysis. So, the second challenge is to modify this PLL for use with vibratory measurement characterized by a low signal-to-noise ratio, amplitude variations and a non-stationary behavior. A complete design and experimental tests are presented to validate the proposed approach.
Highlights
This study concerns the control of electricity consumption in industry
It is not necessary to have a long recording to achieve the desired precision. This property will be used for variable speed functioning
We have shown the use of a Phase Lock Loops (PLLs) to estimate the rotational frequency of a variable speed asynchronous motor from a vibration measurement
Summary
This study concerns the control of electricity consumption in industry. In this sector, electrical motors are used in multiple uses (lifting, ventilation, air conditioning, pumping, etc.) and represent an important part of the final electricity consumption. Electrical motors are used in multiple uses (lifting, ventilation, air conditioning, pumping, etc.) and represent an important part of the final electricity consumption These uses are the subject of particular attention during the processes of estimation of consumption and energy audit. It is clear that electrical measurements (currents, voltages) are the most direct and precise way to estimate the consumption of loads, but, in practice, they are subjected to several constraints : .
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