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Analysis of core losses in induction machine due to skewing

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Rasilo, Paavo
dc.contributor.author Ramesh Chandran, Aravind
dc.date.accessioned 2014-05-13T07:31:44Z
dc.date.available 2014-05-13T07:31:44Z
dc.date.issued 2014-05-05
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/13017
dc.description.abstract This thesis deals with the analysis of losses due to skewing in induction machines.Normally skewing is done in induction machines to reduce noise, torque ripples and selective harmonics on the rotor cage of the machine. Skewing also can increase the effect of inter-bar currents in the machine. Due to die casting of rotor bars in the rotor at high temperatures, a very low resistance path develops between rotor bars. This resistance is called inter-bar resistance. Skewing is believed to promote these inter-bar currents and increase the stray losses happening in an induction machine. The work was carried out using both measurements as well as simulations using finite element analysis. Two rotors were available at the Laboratory, one a skewed and another non-skewed rotor for a 37 kW induction machine. Locked rotor measurements were done by using both the rotors and the losses were calculated. Comprehensive measurements were done by changing different parameters such as frequency, torque, flux and current. A magnetic equivalent circuit and a multislice FEM model were also used to validate the results from the skewed machine. A small inter-bar resistance measurement set-up was also made. In the end all the data from both measurements and simulations were analyzed and conclusions were drawn. en
dc.format.extent 41+9
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Analysis of core losses in induction machine due to skewing en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.subject.keyword skewing en
dc.subject.keyword FEM en
dc.subject.keyword inter-bar current en
dc.subject.keyword inter-bar resistance en
dc.identifier.urn URN:NBN:fi:aalto-201405131784
dc.programme.major Electrical Drives fi
dc.programme.mcode S3016 fi
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Arkkio, Antero
dc.programme EST - Master’s Programme in Electrical Engineering fi
dc.location P1 fi
local.aalto.openaccess yes
local.aalto.digifolder Aalto_05600
dc.rights.accesslevel openAccess
local.aalto.idinssi 49019
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö


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