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Author:Sinervo, Anssi
Title:Modeling and control of flexural rotor vibration of a two-pole cage induction motor
Kaksinapaisen oikosulkumoottorin poikittaisvärähtelyjen mallinnus ja säätö
Publication type:Master's thesis
Publication year:2008
Pages:[11] + 95      Language:   eng
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Sähkömekaniikka   (S-17)
Supervisor:Arkkio, Antero
Instructor:Zenger, Kai
Electronic version URL: http://urn.fi/urn:nbn:fi:tkk-012814
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:active control
flexural vibrations
convergent control
critical speed
Linear Quadratic controller
time-periodic modeling
aikaperiodinen mallinnus
aktiivivaimennus
kriittinen nopeus
LQ-säätö
poikittaisvärähtely
Abstract (eng): The modelling and control of flexural rotor vibrations of large cage induction motors were tested with a 30 kW test machine.
The 2-pole test machine was customized to behave like bigger machines.
The vibrations were controlled with a 4-pole extra stator winding.
A physical, time-periodic model was derived for the machine and written to state-space form for the controllers.
The deformation of rotor axis and the disturbance forces were also modelled.

The models for the test machine were identified with various methods.
Time periodic identification was attempted with indecisive results.
Controllers were designed for the identified models and they were tested with described test measurement set-up.
The controllers were tested at various operation points including the critical speed.

Despite modelling difficulties caused by the curvature shape of the rotor, the rotor vibrations were controlled successfully.
The extra winding could be used to create controlled force that is sufficient for controlling the vibrations.
The vibrations were damped at all rotation speeds as long as the main ux of the machine was sufficient.
With the vibration control, the machine could also be continuously driven at the critical speed.
Abstract (fin): Suurten oikosulkumoottoreiden taivutusvärähtelyn mallinnusta ja säätöä tutkittiin 30 kW koelaitteen avulla.
Kaksinapaista testimoottoria oli muokattu ominaisuuksiltaan muistuttamaan suurempia koneita.
Värähtelyjä säädettiin staattoriin asennetulla nelinapaisella lisäkäämillä.
Koneelle johdettiin fysikaalinen aikaperiodinen malli, joka kirjoitettiin tilaesitykseksi säätimiä varten.
Mallinnuksessa otettiin huomioon roottorin vääntynyt akseli ja muut häiriövoimat.

Koneen mallit identifioitiin useilla eri tavoilla.
Myös aikaperiodista mallinnusta yritettiin.
Säätimet suunniteltiin identifioitujen mallien perusteella ja niiden suorituskykyä tutkittiin työssä kuvaillulla mittalaitteistolla.
Säätimiä kokeiltiin useissa koneen toimintapisteissä, myös kriittisellä nopeudella.

Roottorin käyryyden aiheuttamista mallinnusvaikeuksista huolimatta roottorivärähtelyt saatiin vaimennettua.
Lisäkäämillä pystyttiin luomaan hallittua voimaa, joka riitti värähtelyjen vaimentamiseen.
Värähtelyt pystyttiin vaimentamaan kaikilla pyörimistaajuuksilla kunhan koneen päävuo oli riittävä.
Värähtelysäädön ansiosta konetta voitiin ajaa jatkuvasti myös kriittisellä pyörimisnopeudella.
ED:2010-12-08
INSSI record number: 41398
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