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The use of converters to feed the motors instead of the direct-on-line supply has increased the need to understand the losses of the induction machine in different operating points. Most of the earlier studies have focused on the losses with the nominal supply frequency while this study covers most of the frequency-torque plane below nominal values. A 15 kW standard squirrel-cage machine's losses...
The new European energy efficiency standard EN 50598-2 is in action. The standard introduces three different methods to determine the voltage source converter (VSC) losses. These methods are input-output, calorimetric, and calculation. In this paper, all these three methods are used to determine a commercial frequency converter losses and the pros and cons of all methods are highlighted and discussed.
Frequency converters enable energy savings and sensorless operation monitoring in pump and fan systems. This is possible with model-based estimation methods that apply frequency converter estimates of the rotational speed and the shaft power. Since compressors produce air flow similarly as fans, the same estimation methods should be applicable, if the fluid density change can be detected and analyzed...
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