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OPTIMIZACIJA OKLOPA RAZSMERNIKA ZA NAPAJANJE KOLESNIH ELEKTROMOTORJEV
ZUPANC, KLEMEN (Author), Kramar, Peter (Mentor) More about this mentor... This link opens in a new window

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Abstract
Električni pogonski sklop, ki je vgrajen v sodobna vozila, je vir obsežnih elektromagnetnih motenj. V primeru kolesnega elektromotorja je glavni vir motenj razsmernik, ki pretvarja enosmerno napetost baterij v izmenično napetost primerno za pogon elektromotorja. V vozilu so nameščene številne druge naprave, na katere bi te motnje lahko negativno vplivale. Te naprave lahko razdelimo v tri skupine: naprave povezane s pogonom, varnostni sistemi in večpredstavnost. Pri varnostnih sistemih je pomembno, da delujejo nemoteno oz. v vseh pogojih, saj so drugače lahko ogrožena življenja. Za nemoteno delovanje vseh naprav moramo zagotoviti njihovo elektromagnetno združljivost. Na vezje razsmernika moramo zato namestiti oklop, ki omeji širjenje elektromagnetnega valovanja v okolico. V magistrski nalogi smo opravili optimizacijo oklopa razsmernika. Za izhodišče smo vzeli testno ohišje iz aluminija, ki je opravljalo tudi funkcijo oklopa. Ohišje je bilo odstranjeno iz prototipnega električnega vozila. Opravili smo meritve magnetnega polja z zančno anteno in določili dušenje oklopa. Optimizacija je bila narejena v sklopu numerične analize. Za preračun modela smo uporabili metodo končnih elementov. Model oklopa smo izdelali na podlagi testnega ohišja, velikost reže na modelu pa smo določili glede na rezultate meritev. Ugotovili smo, da na učinkovitost dušenja oklopa v frekvenčnem območju do 1 MHz vpliva izbira materiala in debelina stene. V frekvenčnem območju nad 1 MHz je pomembna samo velikost reže. Izhodiščno ohišje je imelo številne reže in prehode. Za povečanje učinkovitosti bi morali njihovo količino zmanjšati. Izbira materiala je ustrezna, dodatno bi lahko stanjšali debelino stene.

Language:Slovenian
Keywords:oklop, razsmernik, kolesni elektromotor, elektromagnetna združljivost, zančna antena, metoda končnih elementov.
Work type:Master's thesis (m2)
Organization:FE - Faculty of Electrical Engineering
Year:2016
Views:516
Downloads:206
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Secondary language

Language:English
Title:OPTIMIZATION OF THE POWER INVERTER SHIELD FOR IN-WHEEL ELECTRIC MOTORS
Abstract:
The electric drivetrain as part of the modern car is an extensive source of electromagnetic interference. In the case of an in-wheel electric motor, the main source of interference is the inverter. It converts the direct battery current to the alternating current, which is suitable to supply the motor. There are also many other devices installed in a vehicle, which can malfunction as part of the electromagnetic interference. These devices can be divided into three groups: drivetrain related devices, safety systems and entertainment systems. In case of safety systems, it is important, that they operate uninterrupted and in all conditions, otherwise the lives of passengers can be compromised. We have to ensure their electromagnetic compatibility in order to guarantee proper operation of all devices. To limit the propagation of the electromagnetic waves the inverter has to be shielded. The goal of this master thesis was the optimization of such an inverter shield. For our starting point we used an aluminium housing, which was also used for shielding and was removed from a prototype electric vehicle. We used a magnetic field probe to measure the magnetic field and calculate the damping of the shield. The optimization was done by using numerical analysis. To perform the calculations the finite element method was used. The model of the shield was designed on the basis of the test housing, whereas the size of the gap in the model was determined by the measurement results. Results showed that in the frequency range of up to 1 MHz only the material and the housing wall thickness affect the damping of the shield, while in the frequency range above 1 MHz, only the size of the gap is important. The test housing had several gaps and holes. To increase the damping of the shield, their number should be lowered. The material selection was appropriate, however the wall thickness could have been made thinner.

Keywords:shield, inverter, in-wheel electric motor, electromagnetic compatibility, magnetic field probe, finite element method

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