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The structure of the universal micromodule, which is the base for a variety of electrical circuits of the integrating scanning frequency converter (ISFC), is offered. The universal micromodule performed of frameless operational amplifiers and other individually attached components can create a number of secondary resistive sensors with an output frequency signal. This is provided by a certain set...
This article deals with accuracy of indirect torque measurement of converter-fed induction motors. The measurement was held on both mid-(7,5 kW) and low-power (0,5 kW) motors supplied by Siemens SINAMICS G120 frequency converters. The vector control method was used, the effects of speed sensor presence or absence were evaluated. Also the motor temperature influence was taken into account and the proper...
Designing medium voltage adjustable speed drive systems for safe operation in hazardous areas requires expertise in a number of areas relating to frequency converters, motors, and the way they interact. As the use of different voltage-source inverter (VSI) topologies is increasing in the medium-voltage (MV) range, special care has to be taken to limit temperature rise, sparking, and bearing currents...
Uncertainties in measurement due to varying environmental conditions make the benchmarking of frequency converter's intermediate circuit capacitors difficult. The effect of changes in supply network quality, especially the changes in harmonic distortion, to capacitor's temperature-rise is analyzed. The capacitor lifetime is as a function of its temperature and thus more precise measurements and knowledge...
Variable speed driven (VSD) pumps are nowadays widely used in industry applications. Variable speed pumping improves operational flexibility of the pump drive compared with throttle control. In many cases this results in energy cost savings. Nowadays, the performance of frequency converters allows their use as an intelligent monitoring device for the pump drive. This provides new possibilities for...
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