NAPREDNI PRISTOPI K DUŠENJU PREVODNIH ELEKTROMAGNETNIH MOTENJ INTEGRIRANIH ELEKTROMOTORSKIH POGONOV

SAKSIDA, KRISTJAN (author), Jankovec, Marko (mentor)

V tej disertaciji obravnavamo celostni pristop k načrtovanju EMI filtra za dušenje prevodnih elektromagnetnih motenj integriranih elektromotorskih pogonov za vgradnjo v vozila. Integrirani elektromotorski pogoni večjih moči zaradi svoje kompleksne geometrije izkazujejo veliko različnih parazitnih elementov, ki predstavljajo izziv pri modeliranju in napovedovanju elektromagnetnih motenj v razvojni fazi. Za obravnavani pogon smo zgradili SPICE model z upoštevanjem vseh relevantnih parazitnih elementov in ga v simulacijskem okolju LTspice® ovrednotili v frekvenčni in časovni domeni. V slednji smo natančno opisali razmere ob časovnem poteku preklopa močnostnega stikala in implementirali strategijo vodenja dveh primerov naključno izbranih konstantnih vklopnih razmerij, ki se zgodita med enim električnim obratom motorja, kot tudi vodenje SVPWM skozi celotni obrat motorja, ki še izboljšuje natančnost spektra. Raziskave s področja pasivnih in aktivnih filtrskih rešitev za dušenje tako sofaznih kot tudi protifaznih prevodnih motenj se usmerjajo v različne pristope integracije dušilk z namenom povečanja njihove učinkovitosti in izrabe prostora. Mnoge rešitve so neprimerne z vidika vgradnje v integriran elektromotorski pogon velikih moči, saj želene vrednosti induktivnosti dosegajo z velikim številom ovojev, kar pa s stališča proizvodnje ni mogoče aplicirati na vodnike velikih presekov. Na podlagi raziskav obstoječih rešitev in rezultatov simulacij prevodnih elektromagnetnih motenj smo za pogon, ki pod največjo obremenitvijo dosega baterijske tokove do 400 A, razvili in validirali novo hibridno filtrsko rešitev, ki izkazuje dobro sofazno in protifazno dušenje, ne glede na velikost baterijskega toka. Kompenzacijska logika, ki kompenzira magnetni pretok v osrednjem stebru, je izvedena brez povratne zanke, kar načeloma ne vnaša nestabilnosti v sistem. Izvedli smo meritve prevodnih EMI motenj s prototipom hibridne rešitve brez kompenzacije in z aktivno kompenzacijo. Rezultati potrjujejo zadovoljivo delovanje predlagane hibridne rešitve glede na zadane zahteve za vgradnjo v obravnavan integriran elektromotorski pogon in je glede na predvidene postopke izdelave primerna tudi za serijsko proizvodnjo.

• Language: Slovenian
• Keywords: elektromagnetna združljivost, prevodne motnje, integriran elektromotorski pogon, modeliranje EMI, hibridni filter, kompenzacija magnetnega pretoka
• Work type: Doctoral dissertation
• Typology: 2.08 - Doctoral Dissertation
• Organization: FE - Faculty of Electrical Engineering
• Year: 2024
• PID: 20.500.12556/RUL-166102
• COBISS.SI-ID: 220025347
• Publication date in RUL: 20.12.2024

Secondary language

• Language: English
• Title: ADVANCED APPROACHES TO SUPPRESSION OF CONDUCTED ELECTROMAGNETIC DISTURBANCES OF INTEGRATED ELECTRIC MOTOR DRIVES

Abstract

In this dissertation, we present a comprehensive approach to designing an EMI filter for suppressing conducted EMI in integrated electric motor drives for vehicle installation. High-power integrated electric motor drives, due to their complex geometry, exhibit a variety of parasitic elements, which pose challenges for modelling and predicting EMI during the development phase. For the drive under consideration, we built a SPICE model that includes all relevant parasitic elements and evaluated it using the LTspice® environment in both the frequency and time domains. In the latter, we precisely described the conditions during the switching sequence of the MOSFET and implemented a control strategy for two different randomly selected constant duty ratios that occur within one electrical revolution of the motor and SVPWM control throughout the entire electrical revolution of the motor, further improving the overall spectral accuracy. Research on passive and active filtering for suppressing both common-mode and differential-mode conducted interference is focused on various approaches to the integration of chokes to enhance their efficiency and space utilisation. Many solutions are unsuitable for installation in high-power drives because they achieve the desired inductance values with a large number of turns, which is not feasible for conductors with large cross-sections from a manufacturing perspective. Based on the research of existing solutions and the results of conducted EMI simulations, we developed and validated a new hybrid filter solution for the drive, which reaches battery currents up to 400 A. The proposed solution demonstrates effective suppression of both common-mode and differential-mode noise, regardless of the battery current magnitude. The compensation logic, which compensates for the magnetic flux in the central leg, is implemented without a feedback loop, which is less likely to introduce instability into the system. We conducted EMI measurements with the prototype of the hybrid solution without and with active compensation. The results confirm the satisfactory performance of the proposed hybrid solution according to the specified requirements for installation in the considered integrated electric motor drive and indicate that it is also suitable for mass production.

• Keywords: electromagnetic compatibility, conducted electromagnetic interference, integrated electric motor drive, EMI modelling, hybrid filter, magnetic flux compensation