Sökning: "permanent-magnet machines"

Visar resultat 1 - 5 av 44 avhandlingar innehållade orden permanent-magnet machines.

  1. 1. Demagnetization and Fault Simulations of Permanent Magnet Generators

    Författare :Stefan Sjökvist; Sandra Eriksson; Sami Ruoho; Uppsala universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Demagnetization; Permanent magnet; Finite Element Method; Synchronous generators; Wind power; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Sammanfattning : Permanent magnets are today widely used in electrical machines of all sorts. With their increase in popularity, the amount of research has increased as well. In the wind power project at Uppsala University permanent magnet synchronous generators have been studied for over a decade. LÄS MER

  2. 2. Control of permanent-magnet synchronous machines in automotive applications

    Författare :Oskar Wallmark; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Electric drive; electric vehicle; fault tolerance; hybrid electric vehicle; inverter; in-wheel motor; loss minimization; permanent-magnet synchronous machine; phase-locked loop; position estimation; sensorless control; vector control;

    Sammanfattning : This thesis deals with the design and analysis of control system structures for electric drives equipped with permanent-magnet synchronous machines (PMSMs) in automotive applications. Sensorless control, meaning vector control without a mechanical rotor position sensor, is considered and a speed and position estimator of phase-locked loop type is analyzed thoroughly. LÄS MER

  3. 3. On design of slotless permanent magnet machines

    Författare :Jörgen Engström; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 4. Iron Losses in Electrical Machines - Influence of Material Properties, Manufacturing Processes, and Inverter Operation

    Författare :Andreas Krings; Juliette Soulard; Oskar Wallmark; Annette Mütze; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; AC machines; cobalt-iron; eddy current losses; electrical steel sheets; inverter-fed machines; iron alloys; iron loss measurements; machine design; magnetic hysteresis; magnetic losses; magnetic materials; nickel-iron; permanent magnet machines; silicon-iron; soft magnetic composites; slot-less machines; soft magnetic materials; thermal effects.; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : As the major electricity consumer, electrical machines play a key role for global energy savings. Machine manufacturers put considerable efforts into the development of more efficient electrical machines for loss reduction and higher power density achievements. LÄS MER

  5. 5. On design and analysis of synchronous permanent magnet machines for field-weakening operation in hybrid electric vehicles

    Författare :Freddy Magnussen; Chandur Sadarangani; Barrie Mecrow; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Applied mechanics; permanent magnet machines; field-weakening; hybrid electric vehicles; soft magnetic composites; fractional pitch concentrated windings; Teknisk mekanik; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : A regular vehicle of today is equipped with an internal combustion engine that runs on either gasoline or diesel, which are fossil fuels from oil reserves that are millions of years old. In all types of combustion processes carbon dioxide and several other emissions are produced. LÄS MER