Structural optimisation of an induction motor using a genetic algorithm and a finite element method

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Palko, Sakari 2012-02-10T09:13:01Z 2012-02-10T09:13:01Z 1996-08-27
dc.identifier.isbn 951-22-5588-X
dc.identifier.issn 0001-6845
dc.description.abstract Several dozen variables affect the characteristics of an electric motor. The magnetic circuit of an electric motor is highly non-linear and analytically it is not possible to calculate the torque or losses in motors with sufficient accuracy for optimisation of the near air gap region. Only with the finite element method (FEM) is it possible to obtain sufficient accuracy. To be able to accurately evaluate the losses caused by higher harmonics the time-stepping method is needed to simulate the rotation of the rotor. The purpose of this work is to design and to test a method for structural optimisation and to use this method for the design of a new slot shape for induction motors, especially in the optimisation of the near air gap region. This method enables the design of more efficient and smaller motors, or vice versa, design of motors with a higher shaft power from the same amount of materials. This optimisation method is based on a genetic algorithm, and it is applied to the optimisation of the slot dimensions and the whole slot geometry with different voltage sources and optimisation constraints. In the genetic algorithm, optimisation is based on a population. The algorithm changes an entire population of designs instead of one single design in optimisation. The FEM is not accurate, i.e. all the changes in the mesh do not necessarily correspond real improvements in the characteristics of a motor. To improve the reliability of the optimisation results with FEM, the average design of the population is studied. The results obtained clearly indicate the usefulness and the effectiveness of both the optimisation method selected and the FEM in a design for induction motors. en
dc.format.extent 99
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Acta polytechnica Scandinavica. El, Electrical engineering series en
dc.relation.ispartofseries 84 en
dc.subject.other Electrical engineering en
dc.title Structural optimisation of an induction motor using a genetic algorithm and a finite element method en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword numerical simulation en
dc.subject.keyword finite element method en
dc.subject.keyword non-linear optimisation en
dc.subject.keyword genetic algorithm en
dc.subject.keyword structural optimisation en
dc.subject.keyword induction motor en
dc.subject.keyword slot shape en
dc.subject.keyword torque en
dc.subject.keyword electromagnetic losses en
dc.identifier.urn urn:nbn:fi:tkk-001250
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Laboratory of Electromechanics en
dc.contributor.lab Sähkömekaniikan laboratorio fi

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