Sprega elektromagnetskih sila i vibracija statorskoga paketa sinkronoga generatora.

doctoral thesis

• Title (english): Coupling of electromagnetic forces and vibrations of synchronous generator stator core.
• Author: Miroslav Petrinić
• Mentor: Željko Štih (mentor)
• Mentor: Hinko Wolf (komentor)
• Committee member: Željko Štih (član povjerenstva)
• Committee member: Hinko Wolf (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electrical Engineering Fundamentals and Measurements); Zagreb
• Defense date and country: 2019, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Electromechanical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Kroz rad je je analiziran utjecaj različitih nesimetričnih opterećenja na sile i vibracije generatora s istaknutim polovima. Usporedbom napona svitaka postavljenih na zube paketa statora utvrđena je razlika stanja električne nesimetrije od poremećaja kao što su ekscentricitet rotora i kvar namota. Superpozicijom sila koje djeluju na zube generatora određena je ukupna radijalna magnetska sila koja djeluje na paket. Usporedbom izmjerenih akceleracija paketa s frekvencijskim spektrom radijalne sile paketa utvrđeni su elektromagnetski uzrokovani harmonici vibracija i odvojeni od mehanički uzrokovanih harmonika. Rezultati proračuna temeljeni na metodi konačnih elemenata potvrđeni su mjerenjima u laboratoriju na stvarnom stroju. Prikazane metode za analizu radijalnih sila koje djeluju na zube statora i razvijene algoritme za otkrivanje nesimetričnog električnog opterećenja i razlučivanje električki od mehanički uzrokovanih harmonika vibracija moguće je koristiti u fazi projektiranja električnih strojeva te kao dio ekspertnog sustava za nadzor i praćenje stanja sinkronog generatora. Ostvareni izvorni znanstveni doprinosi praktično primjenjivi u gospodarstvu su: metodologija sprege numeričkog proračuna magnetskog polja i vibracija statorskog paketa sinkronog generatora, analiza utjecaja magnetskih sila na prirodu vibracija statorskog paketa pomoću rezultata spregnutih numeričkih proračuna i postupak za razlučivanje elektromagnetskih uzroka vibracija sinkronog generatora iz mjerenja vibracija statorskog paketa i mjerenja magnetske indukcije u zračnom rasporu.

Abstract (english)

Analyses of the effects of asymmetric loads on the magnetic forces and the vibrations of the synchronous generator have been conducted. The methodology for detection and distinguishing electric load asymmetry from rotor eccentricity and winding faults, based on the analyses of voltages induced in measuring coils that are installed on the stator teeth was presented. By superimposing radial forces of teeth located within the urpole region of the machine, a radial force acting on the stator yoke is determined. By comparison of measured vibrations with radial force frequency spectrum of the stator stack the harmonics of vibrations induced by electromagnetic causes are distinguished from the rest of spectrum. To validate the finite element method calculations results, the measurements in the laboratory have been performed on the real machine. Presented methods for detection of asymmetric load condition and determination of electromagnetically caused vibration can be used in the design process of the synchronous machine or in the expert monitoring and diagnostic systems for rotating machines. Following are the industry applicable genuine scientific contributions: methodology of magnetic field and vibration calculation coupling for stator core of synchronous generator, analyses of the effect of magnetic forces on stator core vibrations using coupled numerical calculations and the method to distinguish electromagnetically caused vibrations of synchronous generator based on the vibration and the air gap magnetic flux density measurements.

• Keywords: sinkroni generator; nesimetrična opterećenja; mjerni svitak; magnetska indukcija; magnetske sile; vibracije; metoda konačnih elemenata; spregnuti proračuni
• Keywords (english): salient pole generator; unbalanced load condition; measuring coil; induced voltage; magnetic force; vibrations; finite element method; coupled simulations
• Language: croatian
• URN:NBN: urn:nbn:hr:168:373252
• Promotion: 2019
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: 252 str.
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-09-11 11:11:52