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Wyszukujesz frazę "electrical motors" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Influence of work environment on thermal state of electric mine motors
Autorzy:
Krok, R.
Powiązania:
https://bibliotekanauki.pl/articles/140392.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silnik elektryczny
maszyna górnicza
metoda sieci termicznych
maszyna elektryczna
wyrobisko górnicze
electrical mining motors
thermal network method
exploitation of electric machines
coal mine undergrounds
Opis:
The paper presents a model for calculations of the temperature field in electric mine motors with a water cooled frame. That model was worked out with use of modified and improved thermal networks developed by the author for determining the temperature distributions in different types of ac machines. Thermal calculations for a selected type of 400 kW mining motor were performed with use of an original computer program. Their results were compared with those obtained from measurements. On the basis of the verified simulation results there was determined the influence of value changes of parameters characterising the work environment condition (ambient temperature, inlet temperature and cooling water discharge, degree of covering the casing with coal dust) on the mining motor thermal state.
Źródło:
Archives of Electrical Engineering; 2011, 60, 3; 357-370
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of inverter PWM speed control methods on the operation of a BLDC motor
Autorzy:
Ciurys, M. P.
Powiązania:
https://bibliotekanauki.pl/articles/140544.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analysis
brushless DC motors
electrical machines
PWM speed control
measurements
Opis:
An analysis of the influence of inverter PWM speed control methods on the operation of a brushless DC (BLDC) motor was carried out. Field-circuit models of the BLDC motor were developed taking into account rotational speed control by two classic methods: the unipolar H_ON_L_PWM and the bipolar H_PWM_L_PWM. Waveforms of the electrical and mechanical quantities and the motor parameters were computed. The results of the computations were verified by measurements performed on a specially designed test stand. On the basis of the measuredwaveforms of the electrical and mechanical quantities the dependence of the drive system efficiencies and power losses on rotational speed was determined for the two methods of inverter control.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 939-953
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transients of electrical and mechanical quantities of a brushless DC motor - computations, measurements
Autorzy:
Ciurys, M.
Dudzikowski, I.
Powiązania:
https://bibliotekanauki.pl/articles/141324.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maszyna elektryczna
silnik bezszczotkowy
magnes trwały
silnik BLDC
obliczenia
pomiary
electrical machines
BLDC motors
permanent magnets
computations
measurements
Opis:
The paper presents a method of computing electrical and mechanical variables of BLDC motors. It takes into account electrical, magnetic and mechanical phenomena in the power supply-converter-BLDC motor-load machine system. The solution to the problem is the so-called circuit-field method. The results determined with the use of time stepping finite element method were used as the parameters of equations of the developed mathematical model. Losses in the motor, losses in transistors and diodes of the converter as well as the actual back EMF waveforms, variable moment of inertia and variable load torque are accounted for. The designed laboratory stand and the test results are presented in the paper. The experimental verification shows the correctness of the developed method, algorithm and program. The developed computational method is universal with respect to different electromechanical systems with cylindrical BLDC motors. It can be applied to electromechanical systems with BLDC motors operating at constant but also variable load torque and moment of inertia.
Źródło:
Archives of Electrical Engineering; 2011, 60, 1; 23-34
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected elements of a new method of induction motor efficiency determination
Autorzy:
Dabala, K.
Powiązania:
https://bibliotekanauki.pl/articles/199896.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maszyny elektryczne
silniki indukcyjne
określanie efektywności
electrical machines
induction motors
efficiency under voltage distortions
intervals in efficiency determination methods
Opis:
This paper presents the results of estimating method of the energy consumed by induction motors and the legal situation concerning the efficiency of electrical motors in the European Union. Three elements of a new method of induction motor efficiency determination are described: methodology of taking into account the influence of non-sinusoidal voltage and the voltage unbalance on the motor efficiency and the application of the interval arithmetic in order to determine the border error of the induction motor efficiency. It is proved that the middle of efficiency interval for the direct method of efficiency determination is always equal to or higher than the measurement result and the radius of interval is longer than the border error.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 307-313
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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