Controlled electronic load used in testing electric drives

W pracy przedstawiono rozwiązanie konstrukcyjne układu obciążenia energoelektronicznego. Głównym przeznaczeniem zaprojektowanego urządzenia jest kontrolowany pobór prądu/mocy z prądnicy prądu stałego, która z kolei często wykorzystywana jest jako sterowane obciążenie mechaniczne dla różnego rodzaju silników elektrycznych. Przedstawione rozwiązanie ułatwia procedurę badawczą napędu elektrycznego m.in. poprzez symulowanie różnego rodzaju charakterystyk obciążenia mechanicznego (charakter dźwignicowy, prądnicowy, wentylatorowy). W pracy zaprezentowano budowę obwodu mocy, sposób jego sterowania oraz wyniki badań układu prototypowego.Presented paper gives an overview of the design process of a programmable power electronic load system. The main aim of the proposed structure is a controllable current/power consumption of a direct current machine, which is a common load simulator in case of electrical machine test stand construction. The main task of designed system is the usage convenience and programmability in case of typical load profiles (fan, pump, lift). The design phase is described shortly after a brief overview of existing concepts and their main characteristics. Main digital control system is depicted with a stand-alone user's interface

Programmable load for DC machines

Presented paper gives an overview of the design process of a programmable power electronic load system. The main aim of the proposed structure is a controllable current/power consumption of a direct current machine, which is a common load simulator in case of electrical machine test stand construction. The main task of designed system is the usage convenience and programmability in case of typical load profiles (fan, pump, lift). The design phase is described shortly after a brief overview of existing concepts and their main characteristics. Main digital control system is depicted with a stand-alone user's interface

Effects of space vector modulation strategy on hybrid (Si-SiC) inverter losses

This work summarizes efficiency measurement results of a full bridge, 3 phase inverter composed of state-of-the-art Si IGBT transistors and Si or SiC diodes. Different (symmetrical and discontinuous) space vector modulation strategies were chosen in order to examine their influence (together with modulation frequency) on inverter losses. Induction machine was used as load, different load points were examined. Results clearly show, that proper modulation strategy, minimizing the switching losses of semiconductor switches, can increase the overall output efficiency at about 1% in case of both silicon and hybrid constructions. The drawback of DPWM approach is connected with the decreased quality of inverter output current. Hybrid technology can also improve the output efficiency at about 1% when compared to traditional constructions, but only in case of elevated switching frequencies. At low frequencies (below 10 kHz) modern semiconductor offer comparable results at much lower device costs

Open architecture digital servodrive for PMSM/PMLM-based machine-tool table feed-drives

The paper presents the results of research work on the development of a rapidprototyping test stand for testing: servo control algorithms, trajectory generation, algorithms for increasing overall quality of the feed-drive modules within two axis (X-Y) table of the milling machine. Open architecture interface of the prepared control system lets the potential user test functionality of integration of diagnostic tools within the motion controller - directly, without taking into account communication with top-level CNC system

System odmrażania oraz przeciwdziałania obladzaniu się łopat turbin wiatrowych. Podsumowanie projektu DeICE-UT - 7. Programu Ramowego Unii Europejskiej

A concept of the anti/deicing system is presented. The main system components: actuators, supply system as well as HMI are briefly described. Results of the verification of the system in a climatic chamber are presented. Concluding remarks about system’s efficiency are provided.W artykule prezentowana jest koncepcja systemu odmrażania i przeciwdziałania obladzaniu się łopat turbin wiatrowych. Opisano główne komponenty systemu, m.in.: układy wykonawcze, system zasilania oraz komputerowy system sterowania. Zaprezentowano także wyniki, przeprowadzonej w komorze klimatycznej, walidacji systemu. W ostatniej części zebrano spostrzeżenia dotyczące efektywności działania systemu

Technical design and construction of flying platform type quadrocopter

Jedną z licznych platform latających jest pojazd typu quadrocopter. Rozwój techniki pozwala na budowanie konstrukcji przemieszczających się w wielu osiach. W artykule przedstawiono projekt, wykonanie i oprogramowanie pojazdu typu quadrocopter. Dodatkowo dokonano filtracji sygnałów pomiarowych i opracowano algorytm sterowania.One of the many flying platforms is vehicle of type quadrocopter. The development of technique allows design and construction platforms for moving of several axes. The paper presents the project, construction and programming of flying platform type quadrocopter. Moreover, the filtering of measurements signals and control algorithm was developed

Open architecture digital servodrive for PMSM/PMLM-based machine-tool table feed-drives

The paper presents the results of research work on the development of a rapidprototyping test stand for testing: servo control algorithms, trajectory generation, algorithms for increasing overall quality of the feed-drive modules within two axis (X-Y) table of the milling machine. Open architecture interface of the prepared control system lets the potential user test functionality of integration of diagnostic tools within the motion controller - directly, without taking into account communication with top-level CNC system

Combustion pressure appraisal in marine diesel engine

The practical design of the marine engine multi in-cylinder pressure acquisition system has been presented. The system operational properties and measurement methodology is aimed the online marine diesel engine applications. The design of engine combustion pressure recording system is based on piezoelectric sensors set that comprises quartz pressure element and charge amplifier, mounted on the indicator pipes, equipped with valves. The required crank degree signal is obtained from shaft encoder that is installed on the test bed engine shaft-line (free end of the hydraulic break). The encoder's TDC dedicated reference pulse is able generate simultaneously at the cylinder 1 and 6 in TDC position. The accuracy of the static crankshaft position calibration was evaluated. Additionally, a complex timing system was developed for individual cylinder TDC and crankshaft positioning definition. Before real time data acquisition starts, the number of engine cycles is defined for recording and the first pulse of each crankshaft revolution is used as trigger signal, so that all instantaneous pressure and crank angle signals acquisition can be started at the identical crankshaft position. The method provides required numbers of combustion cycles to be measured for time domain averaging and off line processing

Analysis of the Electrical Machine with Permanent Magnets and Regulated Excitation

The article presents some results of research on a prototype model of Electric Controlled Permanent Magnet Excited Synchronous Machine (ECPSM). In this construction, the additional coil allows to adjust the flux of permanent magnets, adding a degree of freedom to control the machine. In this way, more torque at low motor speeds and increased max speed can be achieved, without the conventional (lowering the efficiency of the drive system) techniques of weakning the field. Control algorithms of vector field orientation (FOC) were used in the research, which was implemented in a microprocessor controller. Modern DSP microcontroller was used for this purpose, which is a part of a dedicated test bench, allowing a comprehensive analysis of the machine.W artykule przedstawiono wyniki badań nad modelem prototypowym maszyny elektrycznej z magnesami trwałymi o regulowanym wzbudzeniu (ECPSM). W przedstawionej konstrukcji, dodatkowa cewka umożliwia regulację strumienia magnesów trwałych, dodając pewien stopień swobody sterowania maszyny. Dzięki temu, osiągnąć można większy moment obrotowy w zakresie niskich prędkości obrotowych oraz zwiększenie prędkości maksymalnej, bez użycia tradycyjnych (obniżających sprawność układu napędowego) technik osłabiania pola. W badaniach wykorzystano algorytmy sterowania z wektorową orientację pola (FOC - Field Oriented Control), które zaimplementowano w autorskim sterowniku mikroprocesorowym. Wykorzystano w tym celu nowoczesny mikrokontroler DSP, będący częścią dedykowanego stanowiska pomiarowego, umożliwiającego kompleksową analizę pracy maszyny