Change search
ReferencesLink to record
Permanent link

Direct link
Electromagnetical model of an induction motor in COMSOL Multiphysics
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 thesis
Abstract [en]

Ansys, Flux or COMSOL are examples of software-tools that can be used to study magnetic

noise, caused by magnetic forces in the air-gap, in induction motors. The project team wanted to

use COMSOL in this thesis. The electromagnetical domain needs to be coupled to the mechanical

domain to complete the study. The air-gap forces, calculated in the electromagnetical model using

the Rotating Machinery module, can be exported to the Acoustic-Solid Interaction module in

COMSOL to enable the vibro-acoustic analysis.

An electromagnetical model of an induction motor is developed in two-dimensions in the finite

element method based software-tool COMSOL Multiphysics in this thesis. Simulation results

obtained in the frequency domain are compared with results achieved in the software-tool FEMM.

Simulation results of the phase inductance, distribution of the flux density and the torque are

compared. The simulated torque in COMSOL is validated with the torque derived based on an

equivalent lumped model of the induction motor. A time-dependent simulation of the motor is

made at

4.7% slip and 1A (peak) supply. The obtained torque is 0.33Nm. The same value is

achieved in the frequency study in COMSOL. The corresponding value is

0.003Nm higher in

FEMM. The evaluated air-gap forces at

4.7% slip can be used for studying vibro-acoustics in


Abstract [sv]

Ansys, Flux eller COMSOL är exempel på datorprogram som kan användas för att studera

magnetiskt brus, orsakad av magnetiska krafter i luftgapet, i induktionsmotorer. Projektgruppen

ville använda COMSOL i det här examensarbetet. För att kunna utföra studien måste den

elektromagnetiska domänen kopplas till den mekaniska domänen. Luftgapskrafterna, beräknade

i den elektromagnetiska modellen genom att använda modulen för roterande maskiner, kan

exporteras till modulen Acoustic-Solid Interaction för att möjliggöra den vibro-akustiska analysen.

En elektromagnetisk modell av en induktionsmotor är utvecklad i två dimensioner i finita

elementmetoden-baserade programvaran COMSOL Multiphysics i det här examensarbetet.

Simuleringsresultat från frekvensdomänen jämförs med resultat som uppnås med

datorprogramvaran FEMM. Simuleringsresultat för fas-induktansen, fördelningen av

flödestätheten och momentet jämförs. Det simulerade momentet i COMSOL valideras med

momentet som härleds utifrån induktionsmotorns motsvarande ekvivalenta schema. En

tidsberoende motor-simulering genomförs vid

4.7% slip, matad med 1A (topp-värde). Det erhållna

momentet är

0.33Nm. Samma värde erhålls i frekvensstudien i COMSOL. Värdet är 0.003Nm

högre i FEMM. De beräknade luftgapskrafterna vid

4.7% slip kan användas för att göra en vibroakustisk

studie i COMSOL.

Place, publisher, year, edition, pages
2014. , 50 p.
EES Examensarbete / Master Thesis, XR-EE-E2C 2014:004
Keyword [en]
Electromagnetical model, Induction motor, Finite element method, COMSOL Multiphysics
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-160703OAI: diva2:790873
Educational program
Master of Science in Engineering - Electrical Engineering; Master of Science - Electric Power Engineering
Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2015-02-26Bibliographically approved

Open Access in DiVA

fulltext(1637 kB)3190 downloads
File information
File name FULLTEXT01.pdfFile size 1637 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Electrical Energy Conversion
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3190 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 356 hits
ReferencesLink to record
Permanent link

Direct link