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Vibroakustična karakterizacija elektronsko komutiranih motorjev
Luznar, Janez (Author), Boltežar, Miha (Mentor) More about this mentor... This link opens in a new window, Slavič, Janko (Co-mentor)

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Abstract
Hitrost in navor elektronsko komutiranih motorjev krmilimo s pomočjo pulzno širinske modulacije (PŠM). Slednja vpliva na fazne tokove motorja, kjer se poleg osnovne, želene frekvenčne komponente, pojavijo tudi številni visoko frekvenčni preklopni harmoniki. Slednji se odražajo v vzbujevalnih elektromagnetnih silah, vibracijskem odzivu dinamske strukture in končnemu strukturnemu hrupu. Vpliv parametrov PŠM na hrup smo preučili eksperimentalno in numerično. Za pridobitev jasnega vpogleda v fizikalno dogajanje smo zasnovali eksperiment, sestavljen iz originalnih delov motorja, ki omogoča kontrolirano vzbujanje, merjenje elektromagnetnih sil in hrupa, ter izključuje mehanske in aerodinamične vire hrupa. Pri numeričnem modeliranju hrupa smo preučili pristop reševanja multifizikalnega problema z uporabo metode končnih elementov za popis električne, elektromagnetne, strukturne in akustične domene. Tak pristop je računsko neučinkovit, zato smo v nadaljevanju predstavili metodo hitrega izračuna hrupa motorja pri vzbujanju s PŠM. Slednja temelji na uporabi razširjene metode rekonstrukcije magnetnega polja in metode modalne superpozicije ter je zaradi računske učinkovitosti primerna tudi za parametrične analize. Na podlagi eksperimentalnega in numeričnega dela smo ugotovili, da preklopni harmoniki PŠM lahko vzbujajo lastno dinamiko strukture ter posledično rezultirajo v povečan strukturni hrup. Hrup preklopnih harmonikov PŠM pa lahko znatno zmanjšamo z ustrezno izbiro preklopne frekvence, ki jo določimo v skladu s strukturno dinamiko sistema.

Language:Slovenian
Keywords:elektromagnetne sile, modalna superpozicija, preklopna frekvenca, pulzno-širinska modulacija, rekonstrukcija magnetnega polja, strukturna dinamika, strukturni hrup
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Year:2019
Publisher:[J. Luznar]
Number of pages:XXX, 114 str.
UDC:534:621.313.13:621.8.038:519.61(043.3)
COBISS.SI-ID:16984347 Link is opened in a new window
Views:320
Downloads:145
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Secondary language

Language:English
Title:Vibro-acoustic characterization of electronically commutated motors
Abstract:
The speed and torque of electronically commutated motors can be controlled by pulse width modulation (PWM), which composes current waveforms of the desired fundamental frequency together with a number of higher switching harmonics. The latter enriches the magnetic force spectrum, escalating the vibrations and the noise of electromagnetic origin. The influence of the PWM carrier frequency on the structure borne noise was researched experimentally and numerically. To obtain a clear insight into the physical phenomenon, an experiment with original motor parts was proposed, which enables controlled excitation with PWM, measurement of magnetic forces and noise, and excludes the aerodynamic and mechanical sources of noise. Further, the numerical modeling of structure borne noise at PWM excitation was studied with a multiphysics finite element analysis containing electronic, electromagnetic, structural and acoustic field problems. This approach is computationally inefficient, therefore a method for a fast structure borne noise prediction at PWM excitation was introduced. The latter uses the extended field reconstruction method and modal superposition method to achieve significantly lower computational times and is suitable for parametric studies. Experimental and numerical work shown that PWM switching harmonics can excite structural dynamics and thus increase the total noise. The PWM switching noise can be reduced by appropriate carrier frequency selection in accordance with the structural dynamics.

Keywords:electromagnetical forces, field reconstruction method, modal superposition, pulse-width modulation, structural dynamics, structure-borne noise, switching frequency

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