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Control Systems for Experimental Magnetic Materials Characterization Using Dynamic Preisach Models
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Reglering av mätsystem för magnetisk material egenskaper med dynamiska Preisach modellen (Swedish)
Abstract [en]

The eciency of electrical machines is of major concern due to their widespread usage and

the globally increasing awareness of energy consumption issues. Iron losses have a signicant

impact on the total and thus researchers and manufacturers of electrical machines are developing

dierent strategies in order to reduce them. The iron losses are highly dependent on the

magnetic material that is used and thus it is necessary to identify its relevant characteristics.

In this work, the development of a control system for inducing a pure sinusoidal magnetic

ux density in the magnetic material is described. This is necessary in order to perform

characterisation of the magnetic material. The main diculty is the highly non-linear and

hysteretic relationship between the magnetic eld strength and the magnetic ux density. In

order to mitigate the eect of the hysteresis, a mathematical inverse model was used in the

control system. To nd a suitable model, an extensive study of literature was performed and

discussed in this work. The Preisach model and its dynamic extension was chosen as the

most suitable approach. A detailed description of both theory and implementation details is

provided in this work. Furthermore, the model is validated by comparing simulation against

measurement data for two dierent materials.

In the last part of this work, the inverse model is combined with a controller to form a feedback

control system. Two dierent control schemes are investigated: a simpler PI controller

and a more elaborate disturbance observer (DOB) based control scheme. The DOB is used

to observe the hysteresis inversion error and the observation is used to correct for the error.

The controller's ability to produce a pure sinusoidal magnetic ux density was assessed by

simulations with dierent magnetic materials at varying frequencies.

Abstract [sv]

Verkningsgraden for elmotorer ar av okande intresse pa grund av deras omfattande anvandning

och vaxande oro for globala energiforbrukningsfragor. Jarnforluster har ett stort inytande

i de totala forlusterna och ar darfor ett viktigt omrade for forskare och tillverkare av elektriska

motorer. Jarnforlusterna beror till stor del av det magnetiska materialet som anvands i

konstruktion av elmotorer och det ar darfor nodvandigt att identiera materialets egenskaper.

I det har arbetet beskrivs utvecklingen av ett reglersystem for att inducera en ren sinusformat

magnetisk odestathet i ett magnetiskt material. Detta ar nodvandigt for att

kunna bestamma det magnetiska materialets egenskaper under kontrollerade forhallanden.

Huvudsvarigheten ar det icke-linjara sambandet mellan magnetiska faltstyrkan och odest

atheten. Sambandet formar en hysteres och for att eliminera dess inytande anvandes en

matematisk invers model. For att hitta en lamplig model genomfordes en literaturstudie och

Preisach modellen och dess dynamiska utokning valdes. I detta arbete nns en detaljerad

beskrivning av bade teorin bakom modellen och dess implementering. Modellen utvarderades

genom att jamfora matvarden med simulationsresultat for olika magnetiska material.

I sista delen av detta arbete kombineras inversmodellen med ett reglerssystem for att kunna

uppna en sinusformat odestathet i det magnetiska materialet. Tva olika regleralgoritmer

utvarderas, en enklare PI-regulator och en regulator som inkluderar en sa kallat "Disturbance

Observer" (DOB). DOB:n anvandes for att observera felet som uppstar vid invertering

av hysteresen och for att korrigera felet. De bada regulatorernas formaga attaterskapa en ren

sinusformat magnetisk odestathet testas genom att genomfora simulationer for olika magnetiska

material vid varierande frekvenser.

Place, publisher, year, edition, pages
2014. , 70 p.
Series
EES Examensarbete / Master Thesis, XR-EE-E2C 2014:006
Keyword [en]
Characterisation, Magnetic material, Sinusoidal excitation, Hysteresis, Modeling, Dynamic Preisach model, Disturbance observer control
Keyword [sv]
Karakterisering, Magnetiska material, Sinusformad excitation, Hysteres, Modellering, Dynamiska Preisach modellen, "Disturbance observer" baserad reglering
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-160704OAI: oai:DiVA.org:kth-160704DiVA: diva2:790881
Educational program
Master of Science in Engineering - Electrical Engineering; Master of Science - Systems, Control and Robotics
Examiners
Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2015-02-26Bibliographically approved

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Citation style
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