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1

Wpływ pasma przenoszenia układu regulacji prądu na generację symptomów zwarć zwojowych silnika PMSM

Tarchała Grzegorz, Krzysztofiak Mateusz

Przegląd Elektrotechniczny

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2023

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R. 99, nr 4

36--42

PL

W artykule przedstawiono wpływ dynamiki regulacji składowych wektora prądu stojana polowo-zorientowanego układu sterowania silnika synchronicznego z magnesami trwałymi PMSM na pojawiające się symptomy uszkodzenia, jakim jest zwarcie zwojowe uzwojenia stojana. Przedstawiono wpływ wartości pasma przenoszenia regulacji prądu oraz częstotliwości zasilania na wartość amplitud drugich harmonicznych sygnałów prądowych i napięciowych układu sterowania. Całość zilustrowano zarówno wynikami badań symulacyjnych, jak i eksperymentalnych.

EN

This paper presents the influence of the dynamics of the control of the stator current vector components of the field-oriented control system of a permanent magnet synchronous motor (PMSM) on the appearing symptoms of a fault, which is a short-circuit within the stator winding. The influence of the value of the current control bandwidth and supply frequency on the value of the second harmonic amplitudes of the current and voltage signals of the control system is presented. The analysis is illustrated with both simulation and experimental results.

2

Analysis of the effects of recycling on process control

Silva Cássio R.A., Panuci Victor C., Coutinho Monica R., Conceição Wagner A.S., Andrade Cid M.G.

Polish Journal of Chemical Technology

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2023

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Vol. 25, nr 2

43--55

EN

The union of different devices in order to obtain a specific response for a process is commonly called a control system. For a control system, it is necessary to have one or more controllers. Among the most used in the industrial sector are the PID and PI controllers. Next to these controllers is the control software. Scilab is a good example of control software. It is characterized as free code software, with no cost for its acquisition, in addition to having a large computational power and integrated tools, such as Xcos, intended for modeling and simulation. For the union with Scilab, there is Arduino. Such a mixture can be used, for example, to control liquid levels in tanks. In this context, the present work aims to study the tank-level control system based on PID and PI controllers through the union between Scilab and Arduino. Phenomenological models were developed based on closed-loop control (feedback control system) of the process with two tanks not coupled with recycle. Furthermore, for comparison purposes, two approaches were used for each process: one considering the saturation of the manipulated variable and the other without the presence of such saturation. At first, there was a need to implement an anti-windup system. For tuning the controller parameters, the ISE method was used, executed through a programming code developed in Scilab. The parameters found for the two systems were tested on a made-up experimental bench. Therefore, using the block diagrams and the method here called “ISE method”, satisfactory values were obtained for the control parameters. These were ratified in the tests carried out in the experimental module. Level control was achieved with greater prominence for the PI controller since there is one less parameter to be tuned and processed by the system. This controller provided results close to the PID controller for cycles up to 50%. In general, the PI controller showed maximum response deviations smaller than the PID, such as deviations of 1.55 cm and 2.40 cm, respectively, for the case with 75% recycle. It was also clear the influence of the saturation of the manipulated variable on the system response, but not on the tuning of the controller parameterseters.

3

Scour Downstream of Grade Control Structures under the Influence of Upward Seepage

Shafai-Bejestan M., Nabavi S. M. R., Dey S.

Acta Geophysica

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2016

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Vol. 64, no. 3

694--710

EN

The installation of free falling jet grade control structures has become a popular choice for river bed stabilization. However, the formation and development of scour downstream of the structure may lead to failure of the structure itself. The current approaches to scour depth prediction are generally based on studies conducted with the absence of upward seepage. In the present study, the effects of upward seepage on the scour depth were investigated. A total of 78 tests without and with the application of upward seepage were carried out using three different sediment sizes, three different tailwater depths, four different flow discharges, and four different upward seepage flow discharge rates. In some tests, the three-dimensional components of the flow velocity within the scour hole were measured for both the cases with and without upward seepage. The scour depth measured for the no-seepage results compared well with the most accurate relationship found in the literature. It was found that generally the upward seepage reduced the downward velocity components near the bed, which led to a decrease in the maximum scour depth. A maximum scour depth reduction of 49% was found for a minimum tailwater depth, small sediment size, and high flow discharge. A decay of the downward velocity vector within the jet impingement was found due to the upward seepage flow velocity. The well known equation of D’Agostino and Ferro was modified to account for the effect of upward seepage, which satisfactorily predicted the experimental scour depth, with a reasonable average error of 10.7%.

4

Designing Vision Based Autonomous Docile-X Mobile Robot for Real-time Application to Soccer Behaviors

Dutta V., Kesswani N.

Journal of Automation Mobile Robotics and Intelligent Systems

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2014

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Vol. 8, No. 4

40--50

EN

This paper aims at developing a real-time, robust, and reliable behaviors for an omnidirectional soccer robot, can be used in crowded dynamically-changing environments. The soccer robot system consists of highly coordinated operations and movements so as to fulfill specific objectives, even under unfavorable situations. The associated issues are position control, velocity control and sensing information in addition to the need for imitating the human-like decision. The proposed method considers not only the kinematics of the robot but also its dynamics. Moreover, a control structure is designed and several behaviors for a soccer robot are proposed. Image processing, recognition and target following algorithm are illustrated through experiments.

5

Badania symulacyjne właściwości struktur sterowania pojazdu elektronicznego małej mocy

Hetmańczyk J.

Zeszyty Naukowe. Elektryka / Politechnika Śląska

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2004

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z. 192

47-56

PL

W pracy przedstawiono porównanie struktur z zadawaniem momentu (prądu) i prędkości przeznaczonych do sterowania napędem dwusilnikowym pojazdu elektrycznego małej mocy. Sterowanie pojazdem odbywa się poprzez zmianę relacji pomiędzy prędkościami obrotowymi kół. W artykule omówiono budowę, sposób działania oraz różnice poszczególnych struktur układu sterowania. Jako wyniki badań symulacyjnych przedstawiono przebiegi prędkości i momentów silników napędu oraz trajektorie ruchu pojazdu, które to przebiegi posłużyły do oceny właściwości badanych struktur. Badania i ocenę struktur sterowania wykonano w programie MATLAB-SIMULINK.

EN

In the paper author compares control structures with current (torque) and velocity set input system, which are meant for control of low power electric vehicle. For this construction the control function is result of both wheels rotational speed relation. The author describes the control systems, methods of operation and differences between the presented control structures. The simulation results in form of the vehicle trajectories as well as the motor velocity and torque waveforms obtained for analyzed control structures are presented. The waveforms were used to compare and evaluate properties of presented structures. The research was realized with MATLAB-SIMULINK software.