Electromagnetical model of an induction motor in COMSOL Multiphysics

University essay from KTH/Elektrisk energiomvandling


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


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