In Plane Numerical Analysis of Mechanical Stress in a Synchronous Reluctance Machine

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Belahcen, Anouar
dc.contributor.advisor Singh, Deepak Iruikwu, Daniel 2014-03-07T13:31:17Z 2014-03-07T13:31:17Z 2013-08-30
dc.description.abstract The distortion due to the mechanical stresses from manufacturing issues and the operation of electrical machines are known to have adverse effect on the magnetic properties of electrical iron core and due to the stress dependency of iron core losses, it is therefore imperative that we account for the stresses from the different conditions causing mechanical stresses in a rotating electrical machine. This work presents a 2-D FE-analysis of the mechanical stresses due to shrink fitting, centrifugal forces and the magnetic forces in a 4-pole, 3-phase synchronous reluctance machine at rated frequency of 50 Hz. The stresses due to shrink fitting and centrifugal forces were computed by solid mechanics method, while the stresses due to magnetic forces were computed using both magnetic field method and solid mechanics method. The total mechanical stress distributions from all stress sources were obtained using a weakly coupled approach. It was found that shrink fitting causes a very large tensile stress at the rotor core and compressive stress in most part of the stator yoke, but have almost no effect at the stator teeth. The centrifugal forces also contribute to the total tensile stress of the rotor core. The magnetic forces have the least effect on the total stress distribution of the machine. The combined stresses obtained are mostly tensile at the rotor core and compressive at most part of the stator yoke, while the stator teeth were under low tensile stress due to the magnetic forces. The presence of flux barriers between flux paths at the rotor core causes large stresses to distribute at the bridge between flux barriers near the fit interface. Increase or decrease of the radial interference and/or frequency increases or reduces the total mechanical stress distribution of the machine. en
dc.format.extent 65+7
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title In Plane Numerical Analysis of Mechanical Stress in a Synchronous Reluctance Machine en
dc.type G2 Pro gradu, diplomityö en Sähkötekniikan korkeakoulu fi
dc.subject.keyword mechanical stress en
dc.subject.keyword shrink fitting en
dc.subject.keyword centrifugal force en
dc.subject.keyword magnetic forces en
dc.subject.keyword solid mechanics en
dc.subject.keyword rotating machinery method en
dc.subject.keyword FE-analysis en
dc.subject.keyword weakly coupled en
dc.identifier.urn URN:NBN:fi:aalto-201403081548
dc.programme.major Electromechanics fi
dc.programme.mcode S-17 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Arkkio, Antero
dc.programme EST - Master’s Programme in Electrical Engineering fi

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