Sökning: "eccentricity"

Visar resultat 1 - 5 av 28 avhandlingar innehållade ordet eccentricity.

  1. 1. Improved performance characteristics of induction machines with non-skewed symmetrical rotor slots

    Detta är en avhandling från Stockholm : KTH

    Författare :Rathna Chitroju; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; skewing; cross current losses; radial magnetic forces; magnetic noise; asymmetrical rotor slots; eccentricity; stator vibration; two-dimensional fast fourier transform; finite element method; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik;

    Sammanfattning : Induction machines convert more than 55% of electrical energy into various other forms in industrial and domestic environments. Improved performance, especially by reduction of losses in induction machines hence can significantly reduce consumption of electricity. LÄS MER

  2. 2. Analysis and control of magnetic forces in synchronous machines

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :J. J. Pérez-Loya; Uppsala universitet.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; eccentricity; electromagnetics; electromagnetic forces; excitation; magnetic fields; magnetic forces; magnetic thrust bearing; rotor drive; split rotor; starting; synchronous generators; synchronous machines; synchronous motors; unbalanced magnetic pull; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : In a synchronous machine, radial, tangential, and axial forces are generated. In this thesis, three different technologies to control them are proposed. The first one, involves the utilization of the radial forces that arise between the rotor and the stator. LÄS MER

  3. 3. Measurement and modelling of unbalanced magnetic pull in hydropower generators

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Mattias Wallin; Uppsala universitet.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Damper winding; eddy currents; field winding short circuit; finite element method; hydropower generator; parallel circuits; rotor eccentricity; salient poles; synchronous generators; synchronous machines; UMP; unbalanced magnetic pull.; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : Hydropower research is often perceived to be an old and exhausted field of study but with ageing equipment and the need for more intermittent operation caused by an increased share of other renewable energy sources new challenges lie ahead.The main focus of this dissertation are the electromagnetic forces resulting from nonuniform air gap flux, whether it be caused by rotor eccentricity or a faulty field winding. LÄS MER

  4. 4. Hydroelectric Generators: Development and Magnetic Pull Forces caused by Rotor Eccentricity

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Richard Perers; Uppsala universitet.; Uppsala universitet.; [2006]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 5. Contributions to the electromechanics of unbalanced magnetic pull in a synchronous hydropower generator

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Yogeshwarsing Calleecharan; Luleå tekniska universitet.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : Misalignment between the rotor geometrical axis and the geometrical stator axis in a hydropower generator is usually present at standstill and when the machine is under operation. Now, rotor-stator eccentricity in a rotating electrical machine is a harbinger to abnormal operating conditions of the machine. LÄS MER