Sökning: "hydroelectric generators"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden hydroelectric generators.

  1. 1. Electromagnetic Analysis of Hydroelectric Generators

    Författare :Martin Ranlöf; Urban Lundin; Georg Traxler-Samek; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Contra-rotating rotors; damping torque; damper winding; finite element method; hydroelectric generators; permeance model; pole shoe shape; rotational losses; single machine infinite bus; slot ripple; synchronizing torque; synchronous machines; voltage waveform.; Engineering physics; Teknisk fysik; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : Hydropower maintains its position as the most important source of renewable electric energy in the world. The efficiency of large hydropower plants is unsurpassed, and after more than hundred years of development, the technology is mature and highly reliable. LÄS MER

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

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

    Sammanfattning : .... LÄS MER

  4. 3. Core Loss Prediction in Hydroelectric Generators and Analysis of a Contra-Rotating Machine Topology

    Författare :Martin Ranlöf; Uppsala universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The call for increased accuracy in the process of design and analysis of electrical machines has encouraged the use of numerical methods to calculate the electric and magnetic field distributions within this type of apparatus. The finite element method is a numerical technique that has become specifically widespread and popular, due to the relative swiftness and accuracy with which it is possible to treat complex machine geometries and non-linear material characteristics. LÄS MER

  5. 4. Electric Power Generation and Storage Using a High Voltage Approach

    Författare :Björn Bolund; Mats Leijon; Hans Bernhoff; Tore Undeland; Uppsala universitet; []
    Nyckelord :Engineering physics; Flywheel; Generation; Generator; High Voltage; Power flow; Poynting; Teknisk fysik;

    Sammanfattning : Production and consumption of electricity have grown enormously during the last century. No mater what the primary source of energy is, almost all generation of electricity comes from conversion of a rotational movement in a generator. The aim of this thesis is to see how high voltage technology influence production and storage of electricity. LÄS MER

  7. 5. Lubrication of sliding bearings for hydropower applications

    Författare :Donald McCarthy; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Sammanfattning : The term "sliding bearing" refers to types of bearing where two conformal surfaces (usually the stationary bearing and a moving shaft) slide relative to one another with load distributed directly across the interface. A suitable lubricant may be employed to reduce the friction between these two surfaces. LÄS MER