Wyniki wyszukiwania - BazTech

1

An experimental and numerical analysis of temperature and velocity field in PM BLDC motor

Melka B., Smolka J., Buliński Z., Ryfa A., Hetmanczyk J.

Przegląd Elektrotechniczny

|

2016

|

R. 92, nr 3

92--95

EN

In this paper, a validated numerical model was introduced to determine the temperature and velocity fields outside the electric motor. The analysed object was a brushless permanent magnet motor (PM BLDC) having a rated power of 431 W with neodymium permanent magnets located on the rotor. The temperature and velocity measurements were conducted using thermocouples and constant-temperature anemometers. The numerical model covered the investigated motor and the same unit working as a generator and the air volume around them in order to improve the heat dissipation conditions. The numerical results show a satisfactory agreement with the values obtained during the measurements.

PL

W pracy przedstawiono zwalidowany eksperymentalnie model numeryczny do wyznaczenia pola temperatury oraz prędkości na obudowie oraz wokół bezszczotkowego silnika elektrycznego małej mocy. Pomiary temperatury i prędkości przeprowadzono na stanowisku badawczym za pomocą termopar oraz anemometrów stałotemperaturowych i posłużyły one do walidacji modelu. Model numeryczny obejmował silnik wraz z obciążającą go prądnicą oraz bryłę powietrza wokół obu maszyn w celu dokładniejszego odwzorowania warunków wymiany ciepła. Wyniki otrzymane z modelu numerycznego wykazały satysfakcjonującą zgodność z wartościami otrzymanymi podczas pomiaru.

2

Cieplno-elektromagnetyczna analiza numeryczna pracy rozdzielnicy elektrycznej niskiego napięcia

Będkowski M, Smolka J., Banasiak K., Buliński Z., Nowak A., Tomanek T., Wajda A.

Elektroinstalator

|

2013

|

nr 9

6--10

PL

Postęp technologiczny wymaga od inżynierów projektowania niezawodnych rozdzielnic elektrycznych, które spełniają coraz wyższe oczekiwania odbiorców. W związku z tym konieczne jest stosowanie coraz bardziej zaawansowanych narzędzi projektowych. W przedstawionym artykule zaprezentowano model numeryczny sprzężonych zjawisk cieplno-elektromagnetycznych występujących w tego typu urządzeniach.

3

Experimentally validated numerical model of coupled flow, thermal and electromagnetic problem in small power electric motor

Slupik L., Smolka J., Wrobel L. C.

Computer Assisted Methods in Engineering and Science

|

2013

|

Vol. 20, no. 2

133--144

EN

This paper describes results of the mathematical modelling of the steady-state thermal phenomena taking place in a Fracmo 240 W DC electric motor. The model of the motor was defined in the ANSYS Fluent software to predict flow and temperature fields inside the machine. The thermal model was coupled with an electromagnetic solver to determine power losses occurring in different parts of the unit. In order to validate the proposed numerical model, a test rig was set up to measure temperatures at points located inside the motor housing and on its external wall. Additionally, the temperature field was captured by an infrared camera. The results obtained from the coupled analysis are comparable with the measurement data.

4

Numerical modelling of a multi-physical problem within an encapsulated three-phase transformer and its surroundings

Smolka J., Nowak A. J., Ingham D.B., Elliot L.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

|

2006

|

Vol. 10, No 1

63-81

EN

The paper presents a numerical thermal model of an encapsulated three-phase electrical transformer. The model is based on the multi-physical approach and involves heat transfer analysis coupled with the examination of specific power losses in the coils and the core using electromagnetic field analysis as well as determination of thermal stresses. The thermal boundary conditions (i. e. local heat fluxes) are determined by considering a numerical model of the surrounding air. Additionally, the device is cooled via radiation (from the external walls) and forced convection (a water cooling system). A few different configurations of the cooler and the heat pipes are also analyzed. Moreover, anisotropic material properties were applied for stranded coils and the core. A partial experimental validation of the model has shown that the temperature distribution within the transformer is more realistic and closer to the measurements when compared with the previous analysis limited to heat transfer problems only with uniform internal heat sources and isotropic material properties. The total heat transfer rate indicates that forced convection is the most important heat dissipation mechanism in this model. The significance of the water cooling system has also been established in calculations of crack presence in the model.