A4 Conference proceedings

Updating the model of a rotor with surface mounted permanent magnets in an active magnetic bearing rotor system


Publication Details
Authors: Vuojolainen Jouni, Smirnov Alexander, Jastrzebski Rafal, Sillanpää Teemu, Ghalamchi Behnam, Hartikainen Toni, Pyrhönen Olli
Publication year: 2016
Language: English
Related Journal or Series Information: International Symposium on Magnetic Bearings
Title of parent publication: The 15th International Symposium on Magnetic Bearings (ISMB15)
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract
In this publication, the finite element method (FEM) model of a rotor of permanent magnet (PM) machine withsurface mounted permanent magnets is updated. Typically rotors are modeled with FEM, but the model is stillonly an approximation of the real rotor. The rotor is constructed from number of different elements and have acomplex geometry. Electrical machine part might have slits, surface mounted or embedded permanent magnets.Elements are often connected with shrink fits and this leads to the properties discrepancy compared to theelements described with Timoshenko beam theory. In the work, specific elements are selected as uncertain basedon engineering experience and the elasticity values of these elements is updated. Experimental data is obtainedwith AMB system identification and then the frequency difference in the resonance and anti-resonancefrequencies between the experimental data and FEM-model is minimized. When the frequency difference hasbeen minimized, the updated FEM-model corresponds better to the experimental data. The updated model isutilized for controller synthesis procedure to improve performance of the control system. An AMB PM machinewith surface mounted permanent magnets was used to test the rotor model update procedure. The procedureallowed to fit the model to the experimental data with accuracy of 56.57 %.

Last updated on 2017-27-03 at 11:35