Numerical Analysis of the Power Balance of an Electrical Machine With Rotor Eccentricity

The power balance in the numerical simulation of a cage induction machine with eccentric rotor has been studied. The asymmetrical air-gap flux density distribution caused by the non-uniform air gap due to eccentricity produced forces that play an important role in the rotor dynamic stability. These...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2016-03, Vol.52 (3), p.1-4
Main Authors: Silwal, B., Rasilo, P., Perkkio, L., Hannukainen, A., Eirola, T., Arkkio, A.
Format: Article
Language:English
Subjects:
2-D analysis
Cage induction machine
Computer simulation
Dynamics
Eccentricity
Electric power generation
Errors
Finite element analysis
Force
forces
Induction machines
Magnetism
Mathematical analysis
Numerical analysis
power balance
rotor eccentricity
rotordynamics
Rotors
Service level agreements
Shafts
Shafts (power)
time-stepping finite element method
Torque
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Summary:The power balance in the numerical simulation of a cage induction machine with eccentric rotor has been studied. The asymmetrical air-gap flux density distribution caused by the non-uniform air gap due to eccentricity produced forces that play an important role in the rotor dynamic stability. These forces act both in the radial and the tangential directions. The tangential force together with the whirling motion produces additional power in the shaft. If the power balance of the simulation satisfies, the power due to the whirling can be calculated from the power balance. This could also give a new approach to compute the forces due to eccentricity or verify the existing force computation methods. The error in the power balance of an eccentric machine has been calculated and the sources of the errors have been illustrated and discussed.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2015.2477847