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Wirtualna technika pomiarowa w laboratoriach maszyn elektrycznych

Biernat A., Urbański W.

Napędy i Sterowanie

2012

R. 14, nr 5

80-87

Współczesna metrologia w sposób jednoznaczny opierana jest na metodach wirtualizujących akt pomiaru. Zalety, jakimi cechują się wirtualne metody pomiarowe, sprawiają, że kwestią czasu pozostaje wykorzystywanie jeszcze metod klasycznych, opartych o mierniki wychyłowe. Stopniowo także tradycyjne przyrządy, których podzielnie zastąpiono ekranem cyfrowym, używane będą tylko do najprostszych pomiarów.

In the article a modern concept, to join many metrological functions within test-stations operated by virtual systems, was described. Electrical machines are especially important objects that should be placed in a virtual environment. They are complicated devices carrying out important technological tasks. In order to perform their comprehensive examinations one should measure many different physical signals (among others: electric current, voltage, power, torque, temperature, induction, vibration parameters), then process them and (based on a proper inference – algorithm) develop a final evaluation. Described requirements complicate laboratory stations and increase the cost of apparatus. Mentioned metrological proceedings are the same for scientific, diagnostic and educational objectives. However classic measurement systems were constructed separately for different kinds of tasks. Taking as an example the virtual measurement systems of thee-phase induction motors: rotational and linear, it was shown that it is possible to build one system carrying out the needs of different clients. Configuring the measurement system is not on the hardware side but the software, which speeds up the construction of measurement systems and lowers the cost of supplying laboratories with modern, multitask equipment.

Wirtualna technika pomiarowa w dydaktyce maszyn elektrycznych

Urbański W.

Maszyny Elektryczne : zeszyty problemowe

2010

Nr 87

227-230

In the article it is shown how to use virtual devices in theoretical teaching of subjects such as metrology and electrical machines utilization. In the preface the concept of a virtual device is defined as well as some specialized software for creating such metrological systems is described. Then characteristics of virtual devices are given all together with their construction modules (sensors, measurement cards, connectors, etc.). An important part of the article is dedicated to measurement errors, first of all the ones that appear while converting signal from analogue to digital one (in blocks a/a, a/c and c/c). The main part of the paper is dedicated to a description of a particular execution of an idea that concerns electrical machines teaching based on virtual applications. The example given shows a research station with a synchronous generator of 10 kVA rated power driven by a direct current motor. The stand is made for measuring a 3-phase generator while it is in no-load state, during a short circuit, and when it is overloaded. The generator is able to work in a co-operation with separated network as well as in a co-operation with power system (after synchronization). The station described is also prepared to calculate parameters of a 3-phase synchronous machine, Potier's reactance, for example.